2020-12-17 Tracking News

Contents on 17 December '20

IAU Minor Planet Center
- NEOCP Activity -- 45 listings
- New MPECs -- fourteen MPECs
Observers -- 37 observers
Impact Risk Monitoring -- nine objects
Chronology

CHANGES COMING: The Asteroid/Comet Connection Web site will soon focus completely on Earth's Busy Neighborhood reporting. Sometime on or soon after Sunday, December 27th, much of the site will be retired.* The Tracking News will be discontinued and taken down entirely** along with its supporting timeline pages, the archives of its predecessor online publication, Major News About Minor Objects, and our even longer running Consolidated Risk Tables feature. Remaining will be Earth's Busy Neighborhood along with its sky chart, ephemerides, and some supporting pages (e.g. Observatory Links). We do plan to make the Web site easier to use, more interesting as regards close-passing asteroids, and more glitch-free while needing much, much less manual attention here than the current site. -- Webmaster

*There may be some brief chaos when we take down the old site and put up the new. Please check back.
**You can still find the old files at the Internet Archive.

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 1241 risk-listed objects, 175 have had news in the last 31 days. Updated at 2011 UTC on 17 Dec.
Earth's Busy Neighborhood traffic page
Ephemerides for risk-listed objects & close passers
News archive (old) & news image catalog (discontinued)
Object Links - mainly for radar targets & close passers (mostly discontinued)
Observing Campaigns (old)

The latest A/CC news is available via framed access, RSS news feed, or redirection.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity on 17 December '20

The MPC's NEO Confirmation Page has 45 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 45 objects listed. Of these, 26 were "one nighters." So far The Tracking News has counted a total of 62 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs on 17 December '20

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been fourteen MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2020-Y19 time-stamped "00:43 UT" - Comet C/2020 X3 (SOHO) - see below
MPEC 2020-Y20 time-stamped "01:02 UT" - 2020 XW6 - see below
MPEC 2020-Y21 time-stamped "01:04 UT" - 2020 YA - see below
MPEC 2020-Y22 time-stamped "01:32 UT" - 2020 XX6 - see below
MPEC 2020-Y23 time-stamped "01:34 UT" - 2020 XY6 - see below
MPEC 2020-Y24 time-stamped "12:27 UT" - Daily Orbit Update - see below
MPEC 2020-Y25 time-stamped "19:16 UT" - 2020 YB - see below
MPEC 2020-Y26 time-stamped "19:17 UT" - 2020 YC - see below
MPEC 2020-Y27 time-stamped "19:18 UT" - 2020 YD - see below
MPEC 2020-Y28 time-stamped "19:21 UT" - 2020 XZ6 - see below
MPEC 2020-Y29 time-stamped "19:22 UT" - 2020 XA7 - see below
MPEC 2020-Y30 time-stamped "23:27 UT" - 2020 YE - see below
MPEC 2020-Y31 time-stamped "23:30 UT" - 2020 YF - see below
MPEC 2020-Y32 time-stamped "23:31 UT" - 2020 YG

MPEC 2020-Y32 - "23:31 UT" - 2020 YG

K20Y00G 2020 YG (small asteroid, Earth MOID=0.8 LD, H=28.4 ~7m) was picked up at 0355 UT on 16 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 16.16-18p3 at G=21.47-22.11 and 17.20p4 at G=20.73-97. This detection was confirmed by the Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) (Dec. 16.26-27p3), program code 1 via Schwarzschild Obs. (Dec. 17.76-77p3), and Schiaparelli Obs. (Dec. 17.85-87p3).

MPEC 2020-Y31 - "23:30 UT" - 2020 YF

K20Y00F 2020 YF (small asteroid, Q=0.988 AU, Earth MOID=1.0 LD, H=29.11 ~5m) was picked up at 0503 UT on 17 Dec. by the Catalina Sky Survey (CSS), observing it at Dec. 17.21-23p2. This detection was confirmed by Steward Obs. Mt. Lemmon Station (Dec. 17.26p3 & 17.34p2), Xingming Obs. #3 (Dec. 17.71p5), Schwarzschild Obs./code 1 (Dec. 17.75p5), Dax Obs. (Dec. 17.75-76p3), Muensterschwarzach Obs. (Dec. 17.83-85p4), and Drebach Obs. (Dec. 17.90p7).

MPEC 2020-Y30 - "23:27 UT" - 2020 YE

K20Y00E 2020 YE (small asteroid, Q=4.352 AU, Earth MOID=6.9 LD, H=24.0 ~54m) was picked up at 0900 UT on 17 Dec. by Pan-STARRS 1 (PS1), observing it at Dec. 16.38p1 and 17.38-40p3. This detection was confirmed by Pan-STARRS 2 (PS2) (Dec. 12.42-45p7), Schwarzschild Obs./code 1 (Dec. 17.88p3), and Drebach Obs. (Dec. 17.92-93p3).

MPEC 2020-Y29 - "19:22 UT" - 2020 XA7

K20X07A 2020 XA7 (H=19.81 ~370m) was picked up at 0838 UT on 14 Dec. by MLS, observing it at Dec. 14.36-38p3 at G=21.28-70, 14.45-46p4 at G=21.39-22.03, and 15.46-48p3 at G=21.70-80. This detection was confirmed by CSS-Kuiper (Dec. 16.29-30p4 & 17.26-27p4).

MPEC 2020-Y28 - "19:21 UT" - 2020 XZ6

K20X06Z 2020 XZ6 (small asteroid, H=24.16 ~50m) was picked up at 1022 UT on 15 Dec. by MLS, observing it at Dec. 15.43-45p3 and 15.53-54p3. This detection was confirmed by Visnjan Obs. (Dec. 16.00-02p5) and CSS-Kuiper (Dec. 16.36p4 & 17.28p3).

MPEC 2020-Y27 - "19:18 UT" - 2020 YD

K20Y00D 2020 YD (small asteroid, H=25.1 ~32m) was picked up at 0352 UT on 16 Dec. by MLS, observing it at Dec. 16.16-18p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 16.28-29p4 & 17.10-11p4), Schwarzschild Obs./code 1 (Dec. 16.69p2 at V=20.7-21.1, 16.97p3 at V=21.7-22.0 & 17.79p3 at V=21.3-22.2), and Sandlot Obs. (Dec. 17.13-17p3).

MPEC 2020-Y26 - "19:17 UT" - 2020 YC

K20Y00C 2020 YC (small asteroid, Earth MOID=5.8 LD, H=26.2 ~19m) was picked up at 0559 UT on 16 Dec. by MLS, observing it at Dec. 16.25-27p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 16.34p3 & 17.17p4), Schwarzschild Obs./code 1 (Dec. 16.95p3 & 17.77p3), Tebbutt Obs. (Dec. 17.15-16p3), and Sandlot Obs. (Dec. 17.20p1 & 17.24p1).

MPEC 2020-Y25 - "19:16 UT" - 2020 YB

K20Y00B 2020 YB (Earth MOID=1.1 LD, H=29.2 ~5m) was picked up at 0628 UT on 16 Dec. by MLS, observing it at Dec. 16.27-29p3 and 17.32-34p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 16.38p4 & 17.18p2), Farra d'Isonzo Obs. (Dec. 16.88-90p2), Xingming Obs. #3 (Dec. 16.90p2), Schwarzschild Obs./code 1 (Dec. 16.94-95p5 & 17.76p4), Great Shefford Obs. (Dec. 17.10-11p3), Tebbutt Obs. (Dec. 17.17-18p3), and Sandlot Obs. (Dec. 17.29-31p3).

<< DOU on 17 December '20 >> MPEC 2020-Y24 - "12:27 UT" - Daily Orbit Update

Observations of risk-listed objects
K20X06E 2020 XE6 (arc=5 days, H=19.9 ~355m) from CSS-Kuiper (Dec. 17.27-28p4)
K20X06A 2020 XA6 (small asteroid, arc=3 days, H=24.0 ~54m) from Dettelbach Vineyard Obs. (Dec. 16.79-81p3) and Steward Mt. Lemmon Sta. (Dec. 17.14p4)
K20X05K 2020 XK5 (small asteroid, Q=4.127 AU, arc=5 days, H=23.7 ~62m) from CSS-Kuiper (Dec. 17.19-20p3)
K20X03X 2020 XX3 (small asteroid, arc=7 days, H=28.4 ~7m, close passer, NHATS target) from UH/Tholen NEO Follow-Up 2.24m Telescope (Dec. 16.31-32p2), Schwarzschild Obs./code 1 (Dec. 16.69p3), Dettelbach Vineyard Obs. (Dec. 16.84-85p3), Great Shefford Obs. (Dec. 17.03p3 & 17.09p3), and Steward Mt. Lemmon Sta. (Dec. 17.14p4)
K20X03E 2020 XE3 (small asteroid, Q=4.518 AU, arc=11 days, H=24.9 ~35m) from CSS-Kuiper (Dec. 17.16-18p4 at G=21.29-22.70)
K20X00F 2020 XF (small asteroid, arc=13 days, H=26.7 ~15m, close passer, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 17.15-16p3)
99942 99942 Apophis (2004 MN4) (NHATS target) from Schiaparelli Obs. (Dec. 14.21-22p3)
Observations of recently (no longer) risk-listed objects
K20X05D 2020 XD5 (arc=6 days, H=20.0 ~339m) from Steward Mt. Lemmon Sta. (Dec. 17.47-48p4)
K20X02H 2020 XH2 (small asteroid, arc=9 days, H=27.0 ~13m, close passer, NHATS target) from CSS-Kuiper (Dec. 17.20-21p4)
K20X01G 2020 XG1 (almost small, i=50.4°, arc=12 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Dec. 17.27p4)
K20W05U 2020 WU5 (i=41.5°, arc=17 days, H=18.7 ~616m) from Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 16.33-34p4)
K20W05L 2020 WL5 (arc=19 days, H=21.3 ~186m) from CSS-Kuiper (Dec. 17.12-13p4)
K20W00G 2020 WG (Q=4.013 AU, arc=31 days, H=21.6 ~162m) from Steward Mt. Lemmon Sta. (Dec. 17.20p4)
Observations of close-passing objects
K20X05S 2020 XS5 (arc=7 days, H=26.6 ~16m) from Schwarzschild Obs./code 1 (Dec. 16.69p4)
K20X04Z 2020 XZ4 (arc=6 days, H=24.7 ~39m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 17.09p3) and Steward Mt. Lemmon Sta. (Dec. 17.35-36p4)
K20X04Y 2020 XY4 (arc=5 days, H=26.7 ~15m, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 16.52p4) and Schwarzschild Obs./code 1 (Dec. 17.04-05p4)
K20X04V 2020 XV4 (arc=5 days, H=25.4 ~28m) from Schiaparelli Obs. (Dec. 13.99-00p3), Holmes/CTIO (Dec. 16.25-26p3), and Steward Mt. Lemmon Sta. (Dec. 17.22p4)
K20X04C 2020 XC4 (arc=8 days, H=26.0 ~21m, NHATS target) from Dettelbach Vineyard Obs. (Dec. 16.73-75p3) and Steward Mt. Lemmon Sta. (Dec. 17.19p4)
K20X03J 2020 XJ3 (arc=7 days, H=25.6 ~26m, NHATS target) from Schwarzschild Obs./code 1 (Dec. 17.07p3)
K20X02B 2020 XB2 (arc=10 days, H=26.0 ~21m) from CSS-Kuiper (Dec. 17.23-24p4 at G=21.78-22.83)
K20X01H 2020 XH1 (arc=10 days, H=22.9 ~89m) from Holmes/CTIO (Dec. 16.24-25p3)
K20X00H 2020 XH (arc=13 days, H=24.6 ~41m) from Steward Mt. Lemmon Sta. (Dec. 17.45-47p4)
K20W02B 2020 WB2 (Q=4.698 AU, arc=28 days, H=23.4 ~71m) from Holmes/CTIO (Dec. 17.15-16p3 at G=22.0-22.2) and CSS-Kuiper (Dec. 17.38-39p3 at G=20.74-22.36)
K20O05K 2020 OK5 (arc=157 days, H=25.2 ~31m, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 17.45-47p4)
J99R45M 1999 RM45 (arc=6 opp, H=19.4 ~446m) from the Spacewatch 0.9m telescope (Dec. 16.46-50p3 at R=22.7-9)
Observation campaigns (NHATS targets, radar support)
K20X03W 2020 XW3 (arc=7 days, H=25.6 ~26m, NHATS) from Pomona College Table Mtn. Obs. (PCTMO) (Dec. 16.29-35p4)
K20X02W 2020 XW2 (arc=10 days, H=25.0 ~34m, NHATS) from CSS-Kuiper (Dec. 17.33-34p4 at G=21.83-22.21)
K20X02T 2020 XT2 (arc=22 days, H=24.7 ~39m, NHATS) from Holmes/CTIO (Dec. 16.21-22p3 & 17.22p3) and Steward Mt. Lemmon Sta. (Dec. 17.24p4)
K20X02O 2020 XO2 (arc=9 days, H=24.7 ~39m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 17.30-32p4)
K20X00W 2020 XW (arc=12 days, H=24.6 ~41m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 17.33-34p3)
K20W03Q 2020 WQ3 (arc=38 days, H=25.7 ~25m, NHATS) from CSS-Kuiper (Dec. 16.53-55p4)
K20W01D 2020 WD1 (arc=31 days, H=23.6 ~65m, NHATS) from Holmes/CTIO (Dec. 17.16-17p3) and Spacewatch 0.9m (Dec. 17.26-28p3)
K20W00Y 2020 WY (arc=31 days, H=26.2 ~19m, NHATS) from the Spacewatch 1.8m telescope (Dec. 17.21p2)
K20V05X 2020 VX5 (arc=34 days, H=23.4 ~71m, NHATS) from CSS-Kuiper (Dec. 17.29-30p4 at G=21.50-22.38)
K20S00O 2020 SO (Q=0.988 AU, arc=32 days, H=28.5 ~7m, NHATS) from CSS (Dec. 16.18-19p3) and Steward Mt. Lemmon Sta. (Dec. 17.15p4)
K20P01X 2020 PX1 (arc=129 days, H=23.6 ~65m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 16.50-51p4 & 17.38p1)
K19Q02W 2019 QW2 (arc=2 opp, H=25.0 ~34m, NHATS) from Schwarzschild Obs./code 1 (Dec. 17.12-13p3 at V=22.2-23.0)
K07U01Y 2007 UY1 (arc=3 opp, H=23.1 ~81m, NHATS) from Spacewatch 0.9m (Dec. 17.20-24p3 at R=21.7-22.3)
K06R01J 2006 RJ1 (arc=4 opp, H=22.2 ~123m, NHATS) from Spacewatch 0.9m (Dec. 17.21-25p3)
04179 4179 Toutatis (1989 AC) (radar) from CSS (Dec. 16.08-10p4) and Drebach Obs. (Dec. 16.75p3)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20Y00A 2020 YA (arc=12 days, H=25.7 ~25m) from Xingming Obs. #3 (Dec. 16.90p2) and Steward Mt. Lemmon Sta. (Dec. 17.34p4)
K20X06Y 2020 XY6 (arc=3 days, H=25.3 ~29m) from CSS-Kuiper (Dec. 17.10-11p2)
K20X06X 2020 XX6 (q=0.260 AU, arc=2 days, H=24.0 ~54m) from Steward Mt. Lemmon Sta. (Dec. 17.26p2)
K20X06K 2020 XK6 (arc=3 days, H=25.2 ~31m) from CSS-Kuiper (Dec. 17.18-19p3)
K20X06G 2020 XG6 (arc=3 days, H=24.3 ~47m) from CSS-Kuiper (Dec. 17.15-16p3)
K20X06D 2020 XD6 (arc=3 days, H=25.2 ~31m) from Schwarzschild Obs./code 1 (Dec. 17.06p3 at V=21.7-22.4) and Steward Mt. Lemmon Sta. (Dec. 17.16-17p4)
K20X06C 2020 XC6 (arc=3 days, H=24.7 ~39m) from CSS-Kuiper (Dec. 17.15p4)
K20X06B 2020 XB6 (i=55.7°, arc=3 days, H=22.6 ~102m) from Steward Mt. Lemmon Sta. (Dec. 17.14-15p4)
K20X05W 2020 XW5 (arc=10 days, H=25.1 ~32m) from Steward Mt. Lemmon Sta. (Dec. 17.28-30p2)
K20X05N 2020 XN5 (arc=5 days, H=22.3 ~117m) from Holmes/CTIO (Dec. 17.18-19p3)
K20X05E 2020 XE5 (arc=7 days, H=24.8 ~37m) from CSS-Kuiper (Dec. 17.25p4 at G=21.48-22.05)
K20X05A 2020 XA5 (arc=8 days, H=24.2 ~49m) from CSS-Kuiper (Dec. 17.22p4 at G=21.93-23.07)
K20X04H 2020 XH4 (arc=7 days, H=23.2 ~78m) from Holmes/CTIO (Dec. 16.27-28p3) and Steward Mt. Lemmon Sta. (Dec. 16.49p3 & 17.24p4)
K20X04G 2020 XG4 (arc=11 days, H=23.0 ~85m) from Holmes/CTIO (Dec. 17.19-20p3) and Steward Mt. Lemmon Sta. (Dec. 17.22p3)
K20X03V 2020 XV3 (arc=8 days, H=22.7 ~98m) from Steward Mt. Lemmon Sta. (Dec. 17.21-22p4)
K20X03U 2020 XU3 (arc=9 days, H=22.3 ~117m) from Holmes/CTIO (Dec. 17.15-17p3)
K20X03S 2020 XS3 (arc=9 days, H=25.1 ~32m) from Schwarzschild Obs./code 1 (Dec. 17.04p2 at V=22.3-4) and Steward Mt. Lemmon Sta. (Dec. 17.18-19p4)
K20X03M 2020 XM3 (arc=11 days, H=22.8 ~93m) from Steward Mt. Lemmon Sta. (Dec. 17.20-21p4)
K20X03D 2020 XD3 (arc=8 days, H=25.6 ~26m) from Steward Mt. Lemmon Sta. (Dec. 17.24-25p4)
K20X03C 2020 XC3 (arc=8 days, H=22.4 ~112m) from Steward Mt. Lemmon Sta. (Dec. 17.19p4)
K20X03A 2020 XA3 (arc=9 days, H=24.4 ~45m) from Schwarzschild Obs./code 1 (Dec. 16.97p3), Mountainville Obs. (Dec. 17.05-13p3), and Steward Mt. Lemmon Sta. (Dec. 17.14p4)
K20X02N 2020 XN2 (arc=9 days, H=23.4 ~71m) from Steward Mt. Lemmon Sta. (Dec. 17.21p4)
K20X02L 2020 XL2 (arc=20 days, H=24.0 ~54m) from Spacewatch 0.9m (Dec. 17.30-34p3 at R=21.5-22.4)
K20X02K 2020 XK2 (arc=10 days, H=23.1 ~81m) from CSS-Kuiper (Dec. 17.35-36p3)
K20X00V 2020 XV (arc=12 days, H=23.9 ~56m) from Schwarzschild Obs./code 1 (Dec. 17.06p3)
K20X00K 2020 XK (arc=13 days, H=24.8 ~37m) from Steward Mt. Lemmon Sta. (Dec. 17.38p4)
K20W05T 2020 WT5 (arc=17 days, H=22.1 ~129m) from Holmes/CTIO (Dec. 17.12-13p3)
K20W04V 2020 WV4 (arc=24 days, H=24.5 ~43m) from CSS-Kuiper (Dec. 17.30p4 at G=21.39-22.41)
K20W03C 2020 WC3 (arc=26 days, H=22.4 ~112m) from Holmes/CTIO (Dec. 17.13-14p3) and Steward Mt. Lemmon Sta. (Dec. 17.19-20p4)
K20W02K 2020 WK2 (arc=6 days, H=23.7 ~62m) from Castelmartini Obs. (Nov. 23.83-84p3)
K20V06E 2020 VE6 (arc=33 days, H=23.7 ~62m) from Steward Mt. Lemmon Sta. (Dec. 17.37-38p4)
K20V03R 2020 VR3 (arc=35 days, H=24.6 ~41m) from Holmes/CTIO (Dec. 16.24-27p3 at G=22.7-8)
K20V02B 2020 VB2 (arc=36 days, H=23.0 ~85m) from Holmes/CTIO (Dec. 16.17-20p3 at G=22.7-9)
K20V01X 2020 VX1 (arc=37 days, H=22.8 ~93m) from Spacewatch 0.9m (Dec. 17.30-33p2)
K20V00T 2020 VT (arc=42 days, H=25.1 ~32m) from Holmes/CTIO (Dec. 16.24p3)
K20U02N 2020 UN2 (arc=62 days, H=22.5 ~107m) from Steward Mt. Lemmon Sta. (Dec. 17.35p4)
K20U01S 2020 US1 (arc=98 days, H=25.0 ~34m) from CSS-Kuiper (Dec. 16.52p2)
K20T07T 2020 TT7 (arc=64 days, H=22.3 ~117m) from Steward Mt. Lemmon Sta. (Dec. 17.27-29p4)
K20T07Q 2020 TQ7 (arc=85 days, H=22.1 ~129m) from Schiaparelli Obs. (Nov. 27.03-05p3)
K20T07N 2020 TN7 (arc=63 days, H=23.6 ~65m) from Steward Mt. Lemmon Sta. (Dec. 16.50-52p4)
K07U12S 2007 US12 (arc=6 opp, H=22.1 ~129m) from Spacewatch 1.8m (Dec. 17.29-32p2 at R=22.1-8)
K20X00P 2020 XP (arc=30 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Dec. 17.32-33p3)
K20W04X 2020 WX4 (Q=5.569 AU, arc=24 days, H=21.8 ~148m) from CSS-Kuiper (Dec. 17.24-25p4)
Observations of other objects
K20X05C 2020 XC5 (Q=4.146 AU, arc=5 days, H=20.9 ~224m) from Holmes/CTIO (Dec. 17.12p3) and Steward Mt. Lemmon Sta. (Dec. 17.16p4)
K20X04T 2020 XT4 (arc=9 days, H=21.1 ~204m) from Holmes/CTIO (Dec. 16.32-33p3) and Steward Mt. Lemmon Sta. (Dec. 17.43p4)
K20X04A 2020 XA4 (arc=8 days, H=21.1 ~204m) from Holmes/CTIO (Dec. 16.22-23p3) and Steward Mt. Lemmon Sta. (Dec. 17.27-28p3)
K20X03Z 2020 XZ3 (arc=8 days, H=20.7 ~245m) from Holmes/CTIO (Dec. 16.25-26p3) and Steward Mt. Lemmon Sta. (Dec. 17.40-42p3)
K20X03L 2020 XL3 (arc=8 days, H=21.2 ~195m) from Steward Mt. Lemmon Sta. (Dec. 17.30-32p4)
K20X03K 2020 XK3 (i=57.3°, arc=8 days, H=21.7 ~155m) from Holmes/CTIO (Dec. 17.10-11p3) and Steward Mt. Lemmon Sta. (Dec. 17.19p4)
K20X02M 2020 XM2 (Q=4.059 AU, arc=11 days, H=19.7 ~389m) from Steward Mt. Lemmon Sta. (Dec. 17.44p4)
K20X01N 2020 XN1 (i=36.8°, Q=4.010 AU, arc=29 days, H=19.6 ~407m) from Steward Mt. Lemmon Sta. (Dec. 17.40-41p4)
K20X00S 2020 XS (i=51.4°, arc=13 days, H=21.2 ~195m) from CSS-Kuiper (Dec. 17.31-32p4)
K20W05V 2020 WV5 (arc=25 days, H=20.2 ~309m) from Steward Mt. Lemmon Sta. (Dec. 16.49-50p4 & 17.34-35p4)
K20W05S 2020 WS5 (i=40.9°, Q=4.054 AU, arc=20 days, H=20.8 ~234m) from Holmes/CTIO (Dec. 16.22-23p3) and Steward Mt. Lemmon Sta. (Dec. 17.24p4)
K20W05B 2020 WB5 (arc=26 days, H=20.4 ~282m) from Holmes/CTIO (Dec. 16.31-33p3 at G=22.2-4)
K20W05A 2020 WA5 (arc=22 days, H=21.5 ~170m) from Steward Mt. Lemmon Sta. (Dec. 17.44p4)
K20V07D 2020 VD7 (arc=36 days, H=21.0 ~214m) from Steward Mt. Lemmon Sta. (Dec. 16.52-53p4 & 17.39-40p4)
K20V06Q 2020 VQ6 (arc=32 days, H=21.2 ~195m) from Mirasteilas Obs. (Dec. 16.85p2) and Steward Mt. Lemmon Sta. (Dec. 17.40-41p4)
K20V03M 2020 VM3 (arc=37 days, H=20.8 ~234m) from Steward Mt. Lemmon Sta. (Dec. 17.44-47p4)
K20U06J 2020 UJ6 (arc=65 days, H=19.9 ~355m) from Steward Mt. Lemmon Sta. (Dec. 16.54-55p4)
K20U01L 2020 UL1 (arc=69 days, H=20.1 ~323m) from Holmes/CTIO (Dec. 17.05-06p3)
K20T05H 2020 TH5 (arc=65 days, H=21.1 ~204m) from Holmes/CTIO (Dec. 17.05-07p3)
K20S01C 2020 SC1 (arc=94 days, H=21.1 ~204m) from Steward Mt. Lemmon Sta. (Dec. 17.24-25p4)
K20Q07A 2020 QA7 (Q=4.150 AU, arc=111 days, H=20.1 ~323m) from Steward Mt. Lemmon Sta. (Dec. 17.40-42p4)
K20Q06Q 2020 QQ6 (Q=4.107 AU, arc=126 days, H=19.8 ~371m) from Steward Mt. Lemmon Sta. (Dec. 17.32-33p3)
K20P01B 2020 PB1 (arc=139 days, H=21.0 ~214m) from Holmes/CTIO (Dec. 16.31-33p3)
K20O08J 2020 OJ8 (i=37.1°, arc=139 days, H=18.7 ~616m) from CSS-Kuiper (Dec. 16.53-54p4)
K20O08C 2020 OC8 (arc=185 days, H=20.7 ~245m) from Spacewatch 0.9m (Dec. 17.30-33p3) and Steward Mt. Lemmon Sta. (Dec. 17.35-36p4)
K20O03W 2020 OW3 (Q=4.803 AU, arc=151 days, H=19.6 ~407m) from Steward Mt. Lemmon Sta. (Dec. 17.33-34p4)
K20O02Q 2020 OQ2 (arc=171 days, H=19.8 ~371m) from Steward Mt. Lemmon Sta. (Dec. 16.53-54p4 at G=21.59-22.90)
K20L02A 2020 LA2 (Q=7.490 AU, arc=185 days, H=19.8 ~371m) from Steward Mt. Lemmon Sta. (Dec. 17.40-43p3)
K20H05H 2020 HH5 (Q=4.516 AU, arc=2 opp, H=19.2 ~490m) from Holmes/CTIO (Dec. 16.28-30p3 at G=22.5-6)
K17Y01Z 2017 YZ1 (arc=4 opp, H=20.4 ~282m) from MLS (Dec. 16.35-37p4)
K17B31L 2017 BL31 (q=0.370 AU, Q=4.566 AU, arc=3 opp, H=19.1 ~513m) from Spacewatch 0.9m (Dec. 17.41-43p3)
K16O05P 2016 OP5 (arc=4 opp, H=20.9 ~224m) from Castelmartini Obs. (Dec. 13.83-84p3), Dettelbach Vineyard Obs. (Dec. 16.77-78p3), and Drebach Obs. (Dec. 16.77-78p2)
K16N00F 2016 NF (arc=3 opp, H=18.4 ~708m) from Spacewatch 0.9m (Dec. 17.15-19p3)
K16J33U 2016 JU33 (arc=2 opp, H=20.9 ~224m) from MLS (Dec. 16.16-18p4)
K16GM0N 2016 GN220 (arc=3 opp, H=19.0 ~537m) from Spacewatch 0.9m (Dec. 17.35-38p3)
K16B14P 2016 BP14 (Q=5.068 AU, arc=3 opp, H=21.0 ~214m) from Spacewatch 0.9m (Dec. 16.51-54p3)
K15Bp4R 2015 BR514 (arc=3 opp, H=19.2 ~490m) from CSS-Kuiper (Dec. 16.50-51p4 at G=21.72-22.33)
K15A00H 2015 AH (arc=3 opp, H=21.5 ~170m) from CSS-Kuiper (Dec. 17.07-09p4 at G=21.79-23.38)
K13P06Y 2013 PY6 (arc=4 opp, H=19.3 ~467m) from Castelmartini Obs. (Nov. 23.90p3)
K12S22A 2012 SA22 (arc=3 opp, H=18.1 ~812m) from MLS (Dec. 16.25-26p4)
K10X25D 2010 XD25 (arc=3 opp, H=20.7 ~245m) from Steward Mt. Lemmon Sta. (Dec. 17.09-10p3)
K09K00K 2009 KK (arc=4 opp, H=20.5 ~269m) from MLS (Dec. 16.18-20p4)
K09A16E 2009 AE16 (i=46.1°, arc=4 opp, H=18.7 ~616m) from MLS (Dec. 16.48-49p4)
K08U07F 2008 UF7 (arc=3 opp, H=19.1 ~513m) from CSS-Kuiper (Dec. 16.48-49p3 at G=21.78-22.29)
K06UI5L 2006 UL185 (arc=6 opp, H=21.4 ~178m) from Spacewatch 0.9m (Dec. 17.14-17p2)
K04L03U 2004 LU3 (arc=5 opp, H=18.4 ~708m) from the Zwicky Transient Facility (ZTF) (Dec. 12.23-26p3 & 14.21-25p2)
K03Y01M 2003 YM1 (arc=3 opp, H=18.2 ~776m) from MLS (Dec. 16.37-39p4)
K03Y00J 2003 YJ (arc=4 opp, H=20.3 ~295m) from CSS (Dec. 16.26-28p4)
K03B47K 2003 BK47 (Q=4.689 AU, arc=3 opp, H=17.7 ~977m) from CSS (Dec. 16.39-41p3)
K02T67S 2002 TS67 (arc=6 opp, H=19.1 ~513m) from MLS (Dec. 16.29-30p4)
K02L03G 2002 LG3 (Q=4.124 AU, arc=3 opp, H=19.9 ~355m) from CSS (Dec. 16.44-45p3)
K01Y03V 2001 YV3 (arc=3 opp, H=20.7 ~245m) from Schiaparelli Obs. (Dec. 14.17-18p5) and CSS (Dec. 16.44-45p4)
K01Y03U 2001 YU3 (arc=3 opp, H=20.2 ~309m) from MLS (Dec. 16.27-28p4)
J97X10E 1997 XE10 from PS1 (Dec. 16.28-31p3)
q3633 523633 2009 XR2 from CSS (Dec. 16.48-50p2)
o8767 508767 1993 BD2 from MLS (Dec. 16.43-45p4)
o6779 506779 2006 YY2 from CSS (Dec. 16.36-37p3)
o5093 505093 2011 VQ5 from ZTF (Dec. 16.24p1, 16.30-34p4, 16.40-43p2 & 16.53p1)
l4554 474554 2003 YQ94 from ATLAS Haleakala (Dec. 16.28-32p4)
k5749 465749 2009 WO6 from ZTF (Dec. 16.41p2, 16.48p1 & 16.53p2)
i9107 449107 2012 VJ82 from CSS (Dec. 16.44-45p4)
h8902 438902 2009 WF104 from ZTF (Dec. 16.31-36p4, 16.47p1 & 16.53p1)
f8797 418797 2008 VF from Castelmartini Obs. (Nov. 23.81-82p3)
f7581 417581 2006 VA3 from MLS (Dec. 16.45-47p4)
f6694 416694 2004 YR32 from MLS (Dec. 16.39-41p4)
f4586 414586 2009 UV18 from Castelmartini Obs. (Nov. 23.89p3)
c2395 382395 1990 SM from ZTF (Dec. 15.55-57p4)
c0929 380929 2006 HU30 from Castelmartini Obs. (Nov. 23.84p3)
c0321 380321 2002 HF8 from MLS (Dec. 16.21-22p4)
c0128 380128 1997 WB21 from MLS (Dec. 16.31-33p4)
b6848 376848 2001 RY47 from PS1 (Dec. 16.28-32p4)
b3579 373579 2002 AW11 from ZTF (Dec. 12.28p2 & 12.33p2)
Z2143 352143 2007 LR32 from MLS (Dec. 16.27-28p4)
Y5705 345705 2006 VB14 from ATLAS Haleakala (Dec. 16.23-28p4)
U7493 307493 2002 XP90 from NEOWISE (Dec. 13.87p2, 14.00p1, 14.13p1, 14.26p1, 14.33p2, 14.39p1, 14.46p1, 14.52p1, 14.59p1, 14.72p1, 14.85p1 & 14.98p2)
S3729 283729 2002 UX from Mirasteilas Obs. (Dec. 16.97-98p3)
R6786 276786 2004 KD1 from MLS (Dec. 16.21-22p4)
R5714 275714 2000 YH4 from CSS (Dec. 16.22-23p4) and AstroColauri Obs. (Dec. 16.88p3)
L6707 216707 2004 XP164 from CSS (Dec. 16.44-45p4)
K2435 202435 2005 XH8 from MLS (Dec. 16.25-26p4)
J9003 199003 2005 WJ56 from PS1 (Dec. 16.22-24p3)
J4126 194126 2001 SG276 from MLS (Dec. 16.14-16p4)
I6822 186822 2004 FE31 from CSS (Dec. 16.24-25p4)
H4881 174881 2004 BU58 from MLS (Dec. 16.47-49p4)
H1819 171819 2001 FZ6 from MLS (Dec. 16.44-45p4)
G2173 162173 Ryugu (1999 JU3) from Castelmartini Obs. (Nov. 23.77-78p3) and CSS (Dec. 16.10-12p4)
F9402 159402 1999 AP10 from ZTF (Dec. 16.41-44p4)
E4411 144411 2004 EW9 from Castelmartini Obs. (Nov. 23.86p3) and MLS (Dec. 16.17-18p4)
E1765 141765 2002 MP3 from MLS (Dec. 16.54-55p4 at G=21.55-22.61)
D8947 138947 2001 BA40 from MLS (Dec. 16.27-29p4)
D8852 138852 2000 WN10 from Castelmartini Obs. (Nov. 23.85p3)
D8095 138095 2000 DK79 from CSS (Dec. 16.10-12p4)
D7924 137924 2000 BD19 from ZTF (Dec. 16.55-57p5)
99907 99907 1989 VA from Castelmartini Obs. (Nov. 23.76-77p3)
96315 96315 1997 AP10 from MLS (Dec. 16.31-33p4)
87684 87684 2000 SY2 from CSS (Dec. 16.11-12p4)
86039 86039 1999 NC43 from CSS (Dec. 16.06-08p4)
85275 85275 1994 LY from CSS (Dec. 16.26-27p3) and Geyserland Obs. (Dec. 16.44-46p4)
68359 68359 2001 OZ13 from Castelmartini Obs. (Dec. 13.84-85p3) and ZTF (Dec. 16.21-22p2)
65717 65717 1993 BX3 from CSS (Dec. 16.24-25p4)
53435 53435 1999 VM40 from ZTF (Dec. 16.38-41p3 & 16.47p1)
36183 36183 1999 TX16 from CSS (Dec. 16.06-08p4)
31669 31669 1999 JT6 from ZTF (Dec. 16.55-57p5)
30825 30825 1990 TG1 from CSS (Dec. 16.08-10p2)
25916 25916 2001 CP44 from MLS (Dec. 16.39-41p4)
21374 21374 1997 WS22 from ZTF (Dec. 12.47p2 & 16.43p2)
21088 21088 Chelyabinsk (1992 BL2) from SATINO-1 (2013 Nov. 20.74-75p6) and MLS (Dec. 16.40-41p4)
16834 16834 1997 WU22 from MLS (Dec. 16.16-18p4)
11405 11405 1999 CV3 from CSS (Dec. 16.07-08p2)
10860 10860 1995 LE from MLS (Dec. 16.27-28p3)
10165 10165 1995 BL2 from MLS (Dec. 16.41-43p4)
07753 7753 1988 XB from MLS (Dec. 16.29-30p4) and Drebach Obs. (Dec. 16.76-77p4)
07350 7350 1993 VA from ZTF (Dec. 15.55-56p3 & 16.55-56p3)
06053 6053 1993 BW3 from ATLAS Haleakala (Dec. 16.19-20p3)
05879 5879 Almeria (1992 CH1) from CSS (Dec. 16.41-43p3)
05863 5863 Tara (1983 RB) from ZTF (Dec. 16.25-26p3 & 16.33p1)
04953 4953 1990 MU from CSS (Dec. 16.10-12p4)
04055 4055 Magellan (1985 DO2) from CSS (Dec. 16.24-25p4)
03199 3199 Nefertiti (1982 RA) from CSS (Dec. 16.50-52p4)
02368 2368 Beltrovata (1977 RA) from MLS (Dec. 16.27-29p4)
01943 1943 Anteros (1973 EC) from CSS (Dec. 16.50-52p4)
01685 1685 Toro (1948 OA) from CSS (Dec. 16.52-54p4)
01036 1036 Ganymed (1924 TD) from ATLAS Mauna Loa (Dec. 16.51p1 & 16.57-59p2)
00887 887 Alinda (1918 DB) from CSS (Dec. 16.13-14p4)

MPEC 2020-Y23 - "01:34 UT" - 2020 XY6

K20X06Y 2020 XY6 (small asteroid, H=25.47 ~27m) was picked up at 0504 UT on 14 Dec. by the Bok Telescope, observing it at Dec. 14.21-23p4. This detection was confirmed by Spacewatch 1.8m (Dec. 14.27p3 at G=21.7-22.1), Astronomical Research Obs. Westfield (Dec. 15.07-08p2 at V=22.0-22.4), and CSS-Kuiper (Dec. 16.12-13p3).

MPEC 2020-Y22 - "01:32 UT" - 2020 XX6

K20X06X 2020 XX6 (small asteroid, q=0.259 AU, H=23.95 ~55m) was picked up at 0837 UT on 15 Dec. by MLS, observing it at Dec. 15.36-38p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 15.45-46p4 & 16.30p2), Visnjan Obs. (Dec. 15.81-82p3), and Schwarzschild Obs./code 1 (Dec. 17.03-04p3).

MPEC 2020-Y21 - "01:04 UT" - 2020 YA

K20Y00A 2020 YA (small asteroid, Earth MOID=6.4 LD, H=25.8 ~23m) was picked up at 0859 UT on 16 Dec. by MLS, observing it at Dec. 5.39-41p4 and 16.37-39p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Dec. 16.42p4 & 16.48p4) and Schwarzschild Obs./code 1 (Dec. 16.95-96p3).

MPEC 2020-Y20 - "01:02 UT" - 2020 XW6

K20X06W 2020 XW6 (H=26.3 ~19m, NHATS) was picked up at 0638 UT on 15 Dec. by MLS, observing it at Dec. 4.39p2 and 15.28-29p4. This detection was confirmed by Spacewatch 1.8m (Dec. 15.35-36p2), Steward Mt. Lemmon Sta. (Dec. 15.43-44p2), CSS-Kuiper (Dec. 16.28-29p4), and Schwarzschild Obs./code 1 (Dec. 16.97-98p3 at V=22.1-6).

MPEC 2020-Y19 - "00:43 UT" - Comet C/2020 X3 (SOHO)

CK20X030* C/2020 X3 (SOHO) (i=143.9°, q=0.005 AU, TP=2020 Dec. 14.94587 TT) was picked up at 1906 UT on 13 Dec. by the LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. (SOHO), observing it at Dec. 13.80-85p7 and 13.90-75p89. This detection was confirmed by the COR2-A instrument (2) aboard STEREO-A (Dec. 14.31-66p27).

Observers on 17 December '20

A total of 37 observers appear in today's MPECs.

Code	Observer / observatory
`L74`	AstroColauri Obs., 1 in MPEC 2020-Y24 -- 275714
`H21`	Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2020-Y23 -- 2020 XY6
`T05`	ATLAS Haleakala in Hawaii, 3 in MPEC 2020-Y24 -- 474554, 345705, 6053
`T08`	ATLAS Mauna Loa in Hawaii, 1 in MPEC 2020-Y24 -- 1036
`V00`	Bok Telescope in Arizona, 1 in MPEC 2020-Y23 -- 2020 XY6
`160`	Castelmartini Obs. in Italy, 11 in MPEC 2020-Y24 -- 2020 WK2, 2016 OP5, 2013 PY6, 99907, 68359, 418797, 414586, 380929, 162173, 144411, 138852
`703`	Catalina Sky Survey (CSS) in Arizona, 29 in MPECs 2020-Y24 & 2020-Y31 -- 2020 YF, 2020 SO, 2003 YJ, 2003 BK47, 2002 LG3, 2001 YV3, 87684, 86039, 85275, 65717, 523633, 506779, 449107, 36183, 30825, 275714, 216707, 186822, 162173, 138095, 11405, 5879, 4953, 4179, 4055, 3199, 1943, 1685, 887
`V06`	Catalina Sky Survey Kuiper Telescope (CSS-Kuiper) in Arizona, 29 in MPECs 2020-Y20, 2020-Y23, 2020-Y24, 2020-Y28, 2020-Y29 & 2020-Y32 -- 2020 YG, 2020 XZ6, 2020 XY6, 2020 XW6, 2020 XW2, 2020 XS, 2020 XK6, 2020 XK5, 2020 XK2, 2020 XH2, 2020 XG6, 2020 XE6, 2020 XE5, 2020 XE3, 2020 XC6, 2020 XB2, 2020 XA7, 2020 XA5, 2020 WX4, 2020 WV4, 2020 WQ3, 2020 WL5, 2020 WB2, 2020 VX5, 2020 US1, 2020 OJ8, 2015 BR514, 2015 AH, 2008 UF7
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 26 in MPEC 2020-Y24 -- 2020 XZ3, 2020 XV4, 2020 XU3, 2020 XT4, 2020 XT2, 2020 XN5, 2020 XK3, 2020 XH4, 2020 XH1, 2020 XG4, 2020 XC5, 2020 XA4, 2020 WU5, 2020 WT5, 2020 WS5, 2020 WD1, 2020 WC3, 2020 WB5, 2020 WB2, 2020 VT, 2020 VR3, 2020 VB2, 2020 UL1, 2020 TH5, 2020 PB1, 2020 HH5
`958`	Dax Obs. in France, 1 in MPEC 2020-Y31 -- 2020 YF
`K87`	Dettelbach Vineyard Obs. in Germany, 4 in MPEC 2020-Y24 -- 2020 XX3, 2020 XC4, 2020 XA6, 2016 OP5
`113`	Drebach Obs. in Germany, 5 in MPECs 2020-Y24, 2020-Y30 & 2020-Y31 -- 2020 YF, 2020 YE, 2016 OP5, 7753, 4179
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2020-Y25 -- 2020 YB
`E89`	Geyserland Obs. in New Zealand, 1 in MPEC 2020-Y24 -- 85275
`J95`	Great Shefford Obs. in England, 2 in MPECs 2020-Y24 & 2020-Y25 -- 2020 YB, 2020 XX3
`B67`	Mirasteilas Obs. in Switzerland, 2 in MPEC 2020-Y24 -- 2020 VQ6, 283729
`V01`	Mountainville Obs. in Utah, 1 in MPEC 2020-Y24 -- 2020 XA3
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 39 in MPECs 2020-Y20, 2020-Y21, 2020-Y22, 2020-Y24, 2020-Y25, 2020-Y26, 2020-Y27, 2020-Y28, 2020-Y29 & 2020-Y32 -- 2020 YG, 2020 YD, 2020 YC, 2020 YB, 2020 YA, 2020 XZ6, 2020 XX6, 2020 XW6, 2020 XA7, 2017 YZ1, 2016 JU33, 2012 SA22, 2009 KK, 2009 AE16, 2003 YM1, 2002 TS67, 2001 YU3, 96315, 508767, 417581, 416694, 380321, 380128, 352143, 276786, 25916, 21088, 202435, 194126, 174881, 171819, 16834, 144411, 141765, 138947, 10860, 10165, 7753, 2368
`K74`	Muensterschwarzach Obs. in Germany, 1 in MPEC 2020-Y31 -- 2020 YF
`C51`	NEOWISE in Earth polar orbit, 1 in MPEC 2020-Y24 -- 307493
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2020-Y24 & 2020-Y30 -- 2020 YE, 1997 XE10, 376848, 199003
`F52`	Pan-STARRS 2 in Hawaii, 1 in MPEC 2020-Y30 -- 2020 YE
`654`	Pomona College Table Mtn. Obs. in southern California, 1 in MPEC 2020-Y24 -- 2020 XW3
`H36`	Sandlot Obs. in Kansas, 3 in MPECs 2020-Y25, 2020-Y26 & 2020-Y27 -- 2020 YD, 2020 YC, 2020 YB
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y24 -- 21088
`204`	Schiaparelli Obs. in Italy, 5 in MPECs 2020-Y24 & 2020-Y32 -- 2020 YG, 2020 XV4, 2020 TQ7, 2001 YV3, 99942
`0331`	program code 1 via Schwarzschild Obs. in Germany, 19 in MPECs 2020-Y20, 2020-Y21, 2020-Y22, 2020-Y24, 2020-Y25, 2020-Y26, 2020-Y27, 2020-Y30, 2020-Y31 & 2020-Y32 -- 2020 YG, 2020 YF, 2020 YE, 2020 YD, 2020 YC, 2020 YB, 2020 YA, 2020 XZ4, 2020 XY4, 2020 XX6, 2020 XX3, 2020 XW6, 2020 XV, 2020 XS5, 2020 XS3, 2020 XJ3, 2020 XD6, 2020 XA3, 2019 QW2
`2492`	LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2020-Y19 -- C/2020 X3
`691`	Spacewatch 0.9m telescope in Arizona, 12 in MPEC 2020-Y24 -- 2020 XL2, 2020 WD1, 2020 VX1, 2020 OC8, 2017 BL31, 2016 NF, 2016 GN220, 2016 BP14, 2007 UY1, 2006 UL185, 2006 RJ1, 1999 RM45
`291`	Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2020-Y20, 2020-Y23 & 2020-Y24 -- 2020 XY6, 2020 XW6, 2020 WY, 2007 US12
`C492`	COR2-A instrument (2) aboard STEREO-A in heliocentric orbit, 1 in MPEC 2020-Y19 -- C/2020 X3
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 66 in MPECs 2020-Y20, 2020-Y21, 2020-Y22, 2020-Y24, 2020-Y25, 2020-Y26, 2020-Y27 & 2020-Y31 -- 2020 YF, 2020 YD, 2020 YC, 2020 YB, 2020 YA, 2020 XZ4, 2020 XZ3, 2020 XY4, 2020 XX6, 2020 XX3, 2020 XW6, 2020 XW5, 2020 XW, 2020 XV4, 2020 XV3, 2020 XT4, 2020 XT2, 2020 XS3, 2020 XP, 2020 XO2, 2020 XN2, 2020 XN1, 2020 XM3, 2020 XM2, 2020 XL3, 2020 XK3, 2020 XK, 2020 XH4, 2020 XH, 2020 XG4, 2020 XG1, 2020 XF, 2020 XD6, 2020 XD5, 2020 XD3, 2020 XC5, 2020 XC4, 2020 XC3, 2020 XB6, 2020 XA6, 2020 XA4, 2020 XA3, 2020 WV5, 2020 WS5, 2020 WG, 2020 WC3, 2020 WA5, 2020 VQ6, 2020 VM3, 2020 VE6, 2020 VD7, 2020 UN2, 2020 UJ6, 2020 TT7, 2020 TN7, 2020 SO, 2020 SC1, 2020 QQ6, 2020 QA7, 2020 PX1, 2020 OW3, 2020 OQ2, 2020 OK5, 2020 OC8, 2020 LA2, 2010 XD25
`858`	Tebbutt Obs. in New Mexico, 2 in MPECs 2020-Y25 & 2020-Y26 -- 2020 YC, 2020 YB
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-Y24 -- 2020 XX3
`L01`	Visnjan Obs. in Croatia, 2 in MPECs 2020-Y22 & 2020-Y28 -- 2020 XZ6, 2020 XX6
`N88`	Xingming Obs. #3, 3 in MPECs 2020-Y24, 2020-Y25 & 2020-Y31 -- 2020 YF, 2020 YB, 2020 YA
`I41`	Zwicky Transient Facility (ZTF) in southern California, 14 in MPEC 2020-Y24 -- 2004 LU3, 68359, 53435, 505093, 465749, 438902, 382395, 373579, 31669, 21374, 159402, 137924, 7350, 5863

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 17 December '20

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL and NEODyS listings is 100 years, and both post impact solutions beyond that for some special objects.
For the latest official risk assessments, and for explanations of the terminology, see the NASA/JPL Sentry and NEODyS CLOMON2 risk pages.
0000NNN000 Object	Risk Monitor	When Noted UTC	0000T0000 Year Range	VI #	000NN00 Prob Cum	T0000 PS Cum	T0000 PS Max	T S	Notes for Today's Latest Risk Assessments

2020 XV6	NEODyS	2010	2099-2105	5	7.67e-07	-4.75	-5.14	0	NEODyS: "Based on 68 optical observations (of which 1 are rejected as outliers) from 2020-12-15.121 to 2020-12-16.781."

2020 XE6	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1419 UTC today

2020 XA6	NEODyS	2010	2057-2073	8	5.33e-06	-4.53	-4.85	0	NEODyS: "Based on 66 optical observations (of which 1 are rejected as outliers) from 2020-12-14.125 to 2020-12-17.142."
2020 XA6	JPL Sentry	1700	2057-2074	7	1.4665312e-05	-4.08	-4.30	0	JPL: Computed at 06:26 today Pacific time based on 66 observations spanning 3.0171 days (2020-Dec-14.124162 to 2020-Dec-17.141271). Diameter approximately 0.053 km. from weighted mean H=24.04.

2020 XK5	JPL Sentry	1700	2114-2114	1	1.843e-10	-9.42	-9.42	0	JPL: Computed at 06:20 today Pacific time based on 20 observations spanning 4.8134 days (2020-Dec-12.387561 to 2020-Dec-17.20098). Diameter approximately 0.063 km. from weighted mean H=23.67.

2020 XX3	JPL Sentry	1700	2086-2119	8	1.029064e-05	-7.01	-7.25	0	JPL: Computed at 06:27 today Pacific time based on 82 observations spanning 6.8658 days (2020-Dec-10.276407 to 2020-Dec-17.142183). Diameter approximately 0.007 km. from weighted mean H=28.46.

2020 XE3	NEODyS	2010	2097	1	2.77e-09	-8.80	-8.8	0	NEODyS: "Based on 28 optical observations (of which 2 are rejected as outliers) from 2020-12-06.283 to 2020-12-17.177."
2020 XE3	JPL Sentry	1700	2097-2097	1	7.799e-09	-8.35	-8.35	0	JPL: Computed at 05:59 today Pacific time based on 26 observations spanning 10.889 days (2020-Dec-06.28728 to 2020-Dec-17.175922). Diameter approximately 0.035 km. from weighted mean H=24.92.

2020 XF	NEODyS	2010	2056-2120	517	9.05e-04	-4.08	-4.3	n/a	NEODyS: "Based on 72 optical observations (of which 1 are rejected as outliers) from 2020-12-04.328 to 2020-12-17.161."
2020 XF	JPL Sentry	1700	2056-2120	138	0.000349003409	-4.53	-5.00	0	JPL: Computed at 06:26 today Pacific time based on 72 observations spanning 12.834 days (2020-Dec-04.32683 to 2020-Dec-17.160394). Diameter approximately 0.016 km. from weighted mean H=26.66.

2016 RP41	JPL Sentry	1700	2022-2114	48	1.54046e-08	-6.06	-6.43	0	JPL: Computed at 17:35 April 8th of 2017 Pacific time based on 7 observations spanning .75865 days (2016-Sep-12.51611 to 2016-Sep-13.27476). Diameter approximately 0.110 km. from weighted mean H=22.48.

2010 WW8	JPL Sentry	1700	2021-2112	81	1.35367e-07	-6.82	-7.13	0	JPL: Computed at 11:07 April 9th of 2017 Pacific time based on 12 observations spanning .06622 days (2010-Nov-30.37333 to 2010-Nov-30.43955). Diameter approximately 0.018 km. from weighted mean H=26.41.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale (next 100 years)

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology on 17 December '20

Times are UTC for when items were noted or added by The Tracking News.

2358	Grabbed MPEC 2020-Y31 - 2020 YF - see above Grabbed MPEC 2020-Y32 - 2020 YG - see above
2330	Grabbed MPEC 2020-Y30 - 2020 YE - see above
2010	Noted that NEODyS has updated its 2020 XA6 risk assessment - see above Noted that NEODyS has updated its 2020 XE3 risk assessment - see above Noted that NEODyS has updated its 2020 XF risk assessment - see above Noted that NEODyS has posted 2020 XV6 as an impact risk - see above Grabbed MPEC 2020-Y25 - 2020 YB - see above Grabbed MPEC 2020-Y26 - 2020 YC - see above Grabbed MPEC 2020-Y27 - 2020 YD - see above Grabbed MPEC 2020-Y28 - 2020 XZ6 - see above Grabbed MPEC 2020-Y29 - 2020 XA7 - see above
1700	Noted that JPL Sentry has updated its 2010 WW8 risk assessment - see above Noted that JPL Sentry has updated its 2016 RP41 risk assessment - see above Noted that JPL Sentry has updated its 2020 XA6 risk assessment - see above Noted that JPL Sentry has updated its 2020 XE3 risk assessment - see above Noted that JPL Sentry has removed 2020 XE6 as an impact risk - see above Noted that JPL Sentry has updated its 2020 XF risk assessment - see above Noted that JPL Sentry has updated its 2020 XK5 risk assessment - see above Noted that JPL Sentry has updated its 2020 XX3 risk assessment - see above Grabbed MPEC 2020-Y24 - Daily Orbit Update - see above
0535	Grabbed MPEC 2020-Y19 - Comet C/2020 X3 (SOHO) - see above Grabbed MPEC 2020-Y20 - 2020 XW6 - see above Grabbed MPEC 2020-Y21 - 2020 YA - see above Grabbed MPEC 2020-Y22 - 2020 XX6 - see above Grabbed MPEC 2020-Y23 - 2020 XY6 - see above

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