2020-12-26 Tracking News

Contents on 26 December '20

IAU Minor Planet Center
- NEOCP Activity -- 45 listings
- New MPECs -- eleven MPECs
Observers -- 29 observers
Impact Risk Monitoring -- eleven 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 will be some 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 1247 risk-listed objects, 150 have had news in the last 31 days. Updated at 2330 UTC on 26 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 26 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, 20 were "one nighters." So far The Tracking News has counted a total of 63 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 26 December '20

Minor Planet Electronic Circulars

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

MPEC 2020-Y127 time-stamped "02:57 UT" - 2020 YC4 - see below
MPEC 2020-Y128 time-stamped "03:19 UT" - 2020 YD4 - see below
MPEC 2020-Y129 time-stamped "12:35 UT" - Daily Orbit Update - see below
MPEC 2020-Y130 time-stamped "13:49 UT" - 2020 YE4 - see below
MPEC 2020-Y131 time-stamped "14:01 UT" - 2017 YL6 - see below
MPEC 2020-Y132 time-stamped "15:00 UT" - 2015 UH52 - see below
MPEC 2020-Y133 time-stamped "16:50 UT" - 2015 DZ53 - see below
MPEC 2020-Y134 time-stamped "17:19 UT" - 2020 YG4 - see below
MPEC 2020-Y135 time-stamped "23:05 UT" - 2020 YJ4 - see below
MPEC 2020-Y136 time-stamped "23:07 UT" - 2020 YK4 - see below
MPEC 2020-Y137 time-stamped "23:08 UT" - 2020 YL4

MPEC 2020-Y137 - "23:08 UT" - 2020 YL4

K20Y04L 2020 YL4 (small asteroid, Earth MOID=7.5 LD, H=22.4 ~112m) was picked up at 0846 UT on 24 Dec. by Pan-STARRS 1 (PS1), observing it at Dec. 24.37-40p3. This detection was confirmed by Great Shefford Obs. (Dec. 25.02-04p4), Sandlot Obs. (Dec. 25.31-33p3 & 26.19-23p2), Tebbutt Obs. (Dec. 26.17-18p2), Astronomical Research Obs. Westfield (Dec. 26.18-19p3), Steward Obs. Mt. Lemmon Station (Dec. 26.23-25p3), and Visnjan Obs. (Dec. 26.87p2).

MPEC 2020-Y136 - "23:07 UT" - 2020 YK4

K20Y04K 2020 YK4 (small asteroid, H=25.0 ~34m) was picked up at 0519 UT on 26 Dec. by the Mt. Lemmon Survey (MLS), observing it at Dec. 22.33-34p2 and 26.22-24p3. This detection was confirmed by Sandlot Obs. (Dec. 26.28-29p4), Steward Mt. Lemmon Sta. (Dec. 26.30p3 & 26.43-44p4), and Visnjan Obs. (Dec. 26.84-85p3).

MPEC 2020-Y135 - "23:05 UT" - 2020 YJ4

K20Y04J 2020 YJ4 (small asteroid, H=24.0 ~54m) was picked up at 0514 UT on 26 Dec. by the Catalina Sky Survey (CSS), observing it at Dec. 26.22-23p3. This detection was confirmed by PS1 (Dec. 24.34-35p2), Steward Mt. Lemmon Sta. (Dec. 26.25p4 & 26.40p4), Visnjan Obs. (Dec. 26.71-72p5), Drebach Obs. (Dec. 26.74p2), Paus Obs. (Dec. 26.81p2), Farra d'Isonzo Obs. (Dec. 26.83-87p4), Schiaparelli Obs. (Dec. 26.84-85p3), Bernezzo Obs. (Dec. 26.86-87p3), and M57 Obs. (Dec. 26.88-91p4).

MPEC 2020-Y134 - "17:19 UT" - 2020 YG4

K20Y04G 2020 YG4 (Earth MOID=0.0 LD, H=25.7 ~25m) was picked up at 1151 UT on 25 Dec. by ATLAS Haleakala, observing it at Dec. 25.46-51p8. This detection was confirmed by PS1 (Dec. 24.42-45p3), Pan-STARRS 2 (PS2) (Dec. 24.52p1), Muensterschwarzach Obs. (Dec. 25.82-83p3), Great Shefford Obs. (Dec. 26.04p4), Schiaparelli Obs. (Dec. 26.06-10p3), Visnjan Obs. (Dec. 26.13p5), Tebbutt Obs. (Dec. 26.19-21p4), Sandlot Obs. (Dec. 26.36p5), ARO Westfield (Dec. 26.38p5), and CSS (Dec. 26.50-52p4).

MPEC 2020-Y133 - "16:50 UT" - 2015 DZ53

K15D53Z 2015 DZ53 (q=0.196 AU, H=20.9 ~224m) from PS1 (Dec. 24.22p1), MLS (Dec. 26.12-14p4), and Steward Mt. Lemmon Sta. (Dec. 26.19-24p5)

MPEC 2020-Y132 - "15:00 UT" - 2015 UH52

K15U52H 2015 UH52 (risk listed, Earth MOID=0.2 LD, H=26.1 ~20m, close passer) from UH/Tholen NEO Follow-Up CFH Telescope (2019 Dec. 1.49-52p7 at G=23.75-24.24, 2019 Dec. 2.44p2 at G=23.68-71 & 2019 Dec. 3.51p2 at G=23.61-75)

MPEC 2020-Y131 - "14:01 UT" - 2017 YL6

K17Y06L 2017 YL6 (small asteroid, Earth MOID=2.4 LD, H=22.5 ~107m) from PS1 (Dec. 25.56-59p4 at w=21.94-22.49) and Spacewatch via Kitt Peak Natl. Obs. (KPNO) (Dec. 26.49p3 at R=21.5-22.1)

MPEC 2020-Y130 - "13:49 UT" - 2020 YE4

K20Y04E 2020 YE4 (Earth MOID=1.9 LD, H=26.1 ~20m) was picked up at 1253 UT on 24 Dec. by PS1, observing it at Dec. 24.54-58p4. This detection was confirmed by Schiaparelli Obs. (Dec. 24.95-97p3), Great Shefford Obs. (Dec. 24.95-96p4), Sandlot Obs. (Dec. 25.36-39p4), Visnjan Obs. (Dec. 26.15p3), and ARO Westfield (Dec. 26.23p3).

<< DOU on 26 December '20 >> MPEC 2020-Y129 - "12:35 UT" - Daily Orbit Update

Observations of risk-listed objects
K20Y03C 2020 YC3 (arc=5 days, H=20.2 ~309m) from Steward Mt. Lemmon Sta. (Dec. 26.21-22p3)
K20Y03A 2020 YA3 (small asteroid, arc=5 days, H=26.0 ~21m, close passer) from Steward Mt. Lemmon Sta. (Dec. 26.34p3)
K20Y01L 2020 YL1 (i=49.0°, arc=7 days, H=20.4 ~282m) from Steward Mt. Lemmon Sta. (Dec. 26.29p3)
K20Y01A 2020 YA1 (small asteroid, arc=9 days, H=26.7 ~15m, close passer, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 26.44p4)
K20X00F 2020 XF (small asteroid, arc=22 days, H=26.8 ~15m, close passer, NHATS target) from Spacewatch/KPNO (Dec. 26.15-17p2 at R=22.0-23.6)
99942 99942 Apophis (2004 MN4) (NHATS target) from ATLAS Mauna Loa (Dec. 25.60-61p4)
Observations of recently (no longer) risk-listed objects
K20Y01E 2020 YE1 from Steward Mt. Lemmon Sta. (Dec. 26.48-49p3)
K20X06U 2020 XU6 (arc=12 days, H=21.3 ~186m) from Steward Mt. Lemmon Sta. (Dec. 26.37-39p3)
K20X01G 2020 XG1 (i=50.3°, arc=21 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (Dec. 26.06-07p3)
Observations of close-passing objects
K20Y03Y 2020 YY3 (arc=4 days, H=26.4 ~18m, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 26.35-36p3)
K20Y03O 2020 YO3 (arc=3 days, H=24.6 ~41m) from ATLAS Haleakala (Dec. 25.45p5) and ATLAS Mauna Loa (Dec. 25.45p3, 25.55p1 & 26.36-38p4)
K20Y02L 2020 YL2 (arc=7 days, H=25.1 ~32m) from MLS (Dec. 24.21-23p3), ATLAS Haleakala (Dec. 24.45-49p4), Schiaparelli Obs. (Dec. 24.88-89p2), Great Shefford Obs. (Dec. 24.97-98p4), Visnjan Obs. (Dec. 26.12p3), Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 26.15-16p3), and Steward Mt. Lemmon Sta. (Dec. 26.27-28p2)
K20X04Z 2020 XZ4 (arc=14 days, H=24.8 ~37m, NHATS target) from Mountainville Obs. (Dec. 25.17-20p2), PS1 (Dec. 25.49-52p3), and ATLAS Haleakala (Dec. 25.57-58p4)
K20T12B 2020 TB12 (arc=72 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (Dec. 26.12-15p3)
K20O05K 2020 OK5 (arc=166 days, H=25.2 ~31m, NHATS target) from the Spacewatch 0.9m telescope (Dec. 26.38-40p3)
K13F00K 2013 FK (Q=4.056 AU, arc=3 opp, H=23.2 ~78m, radar support) from PS1 (Dec. 25.56-58p3)
K12UH1K 2012 UK171 (arc=3 opp, H=24.4 ~45m, NHATS target) from ATLAS Mauna Loa (Dec. 25.32-34p4)
Observation campaigns (NHATS targets, radar support)
K20Y04D 2020 YD4 (arc=4 days, H=23.9 ~56m, NHATS) from Holmes/CTIO (Dec. 26.09-10p3)
K20Y03N 2020 YN3 (arc=5 days, H=23.1 ~81m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 26.35p3)
K20Y03B 2020 YB3 (arc=5 days, H=26.6 ~16m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 26.38-39p3)
K20W01D 2020 WD1 (arc=36 days, H=23.6 ~65m, NHATS) from Holmes/CTIO (Dec. 19.15-16p3)
K20T08J 2020 TJ8 (arc=73 days, H=24.8 ~37m, NHATS) from Spacewatch/KPNO (Dec. 26.34-36p3)
K13Y02S 2013 YS2 (arc=2 opp, H=23.7 ~62m, NHATS) from ATLAS Mauna Loa (Dec. 25.32-34p4) and Spacewatch 0.9m (Dec. 26.26-27p3)
04179 4179 Toutatis (1989 AC) (radar) from ATLAS Mauna Loa (Dec. 25.24-26p4)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small asteroids (H>22.0)
K20Y04C 2020 YC4 (arc=3 days, H=24.8 ~37m) from Steward Mt. Lemmon Sta. (Dec. 26.32-33p3)
K20Y02Z 2020 YZ2 (arc=5 days, H=24.5 ~43m) from Steward Mt. Lemmon Sta. (Dec. 26.18p3)
K20Y02Y 2020 YY2 (arc=5 days, H=22.4 ~112m) from ATLAS Haleakala (Dec. 25.31-33p4), Dettelbach Vineyard Obs. (Dec. 25.75-76p4), and Steward Mt. Lemmon Sta. (Dec. 26.10-11p4)
K20Y01V 2020 YV1 (arc=7 days, H=24.4 ~45m) from Steward Mt. Lemmon Sta. (Dec. 26.45-46p2)
K20Y01Q 2020 YQ1 (arc=7 days, H=23.2 ~78m) from Steward Mt. Lemmon Sta. (Dec. 26.37p3)
K20X06R 2020 XR6 (Q=4.343 AU, arc=5 days, H=22.9 ~89m) from Holmes/CTIO (Dec. 19.26-28p3)
K20X06Q 2020 XQ6 (q=0.325 AU, arc=11 days, H=22.8 ~93m) from Mountainville Obs. (Dec. 25.04-11p3)
K20X05N 2020 XN5 (arc=10 days, H=22.3 ~117m) from Holmes/CTIO (Dec. 19.19-20p3)
K20X03M 2020 XM3 (arc=16 days, H=22.7 ~98m) from Holmes/CTIO (Dec. 19.17-18p3)
K20X03C 2020 XC3 (arc=17 days, H=22.5 ~107m) from Steward Mt. Lemmon Sta. (Dec. 26.07p3)
K20X01U 2020 XU1 (arc=38 days, H=22.2 ~123m) from Holmes/CTIO (Dec. 19.21-22p3)
K20X00V 2020 XV (arc=21 days, H=23.9 ~56m) from Spacewatch/KPNO (Dec. 26.23-24p3)
K20X00K 2020 XK (arc=22 days, H=24.7 ~39m) from Spacewatch/KPNO (Dec. 26.31-33p3)
K20W05T 2020 WT5 (arc=23 days, H=22.1 ~129m) from Holmes/CTIO (Dec. 19.14-15p3)
K20R11Q 2020 RQ11 (arc=104 days, H=22.3 ~117m) from Spacewatch/KPNO (Dec. 26.13-14p3)
K20R06O 2020 RO6 (arc=104 days, H=22.6 ~102m) from Steward Mt. Lemmon Sta. (Dec. 26.11p3)
K12XD3E 2012 XE133 (arc=2 opp, H=23.3 ~74m) from Muensterschwarzach Obs. (Dec. 25.74-75p4) and Dettelbach Vineyard Obs. (Dec. 25.79p3)
K11M00L 2011 ML (arc=70 days, H=22.2 ~123m) from PS1 (2011 Aug. 28.45-47p3 & 2011 Aug. 31.36-37p2)
Observations of other objects
K20Y03Q 2020 YQ3 (arc=4 days, H=20.3 ~295m) from ATLAS Mauna Loa (Dec. 25.62-65p4) and Steward Mt. Lemmon Sta. (Dec. 26.44p4)
K20Y01P 2020 YP1 (i=37.1°, q=0.349 AU, arc=7 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (Dec. 26.33p2)
K20X07C 2020 XC7 (arc=7 days, H=20.5 ~269m) from Holmes/CTIO (Dec. 19.09-10p3)
K20X07A 2020 XA7 (arc=5 days, H=19.7 ~389m) from Holmes/CTIO (Dec. 19.30-32p3)
K20X04T 2020 XT4 (arc=18 days, H=21.1 ~204m) from Steward Mt. Lemmon Sta. (Dec. 26.41p2)
K20X04A 2020 XA4 (arc=13 days, H=21.0 ~214m) from Holmes/CTIO (Dec. 19.24-25p3)
K20X03Z 2020 XZ3 (arc=12 days, H=20.7 ~245m) from Holmes/CTIO (Dec. 19.34p3)
K20X01F 2020 XF1 (i=51.9°, arc=17 days, H=21.7 ~155m) from Holmes/CTIO (Dec. 19.12-13p3)
K20W05V 2020 WV5 (arc=34 days, H=20.2 ~309m) from Steward Mt. Lemmon Sta. (Dec. 26.15p2)
K20W05S 2020 WS5 (i=40.9°, Q=4.062 AU, arc=28 days, H=20.7 ~245m) from ATLAS Haleakala (Dec. 25.35-40p4) and Muensterschwarzach Obs. (Dec. 25.73-74p3)
K20W05M 2020 WM5 (Q=4.828 AU, arc=27 days, H=20.4 ~282m) from PS1 (Dec. 25.37-42p3) and ATLAS Haleakala (Dec. 25.50-51p4)
K20W05C 2020 WC5 (arc=31 days, H=20.1 ~323m) from ATLAS Haleakala (Dec. 25.58-59p4) and Steward Mt. Lemmon Sta. (Dec. 26.44-45p4)
K20W05A 2020 WA5 (arc=30 days, H=21.6 ~162m) from ATLAS Haleakala (Dec. 25.56-57p4)
K20W03M 2020 WM3 (i=40.4°, arc=36 days, H=18.5 ~676m) from Steward Mt. Lemmon Sta. (Dec. 26.45-46p4)
K20W02H 2020 WH2 (Q=4.565 AU, arc=38 days, H=20.0 ~339m) from Spacewatch 0.9m (Dec. 26.34-35p3)
K20W01Z 2020 WZ1 (i=45.2°, arc=39 days, H=20.3 ~295m) from Steward Mt. Lemmon Sta. (Dec. 26.40-41p3)
K20V03M 2020 VM3 (arc=45 days, H=20.7 ~245m) from PS2 (Dec. 25.45-49p3)
K20S01K 2020 SK1 (arc=121 days, H=21.0 ~214m) from Steward Mt. Lemmon Sta. (Dec. 26.19-20p3)
K20P05C 2020 PC5 (Q=4.177 AU, arc=134 days, H=18.5 ~676m) from Steward Mt. Lemmon Sta. (Dec. 26.16p3)
K20P01D 2020 PD1 (Q=4.135 AU, arc=187 days, H=19.2 ~490m) from Steward Mt. Lemmon Sta. (Dec. 26.16-17p3)
K20G03N 2020 GN3 (arc=280 days, H=19.3 ~467m) from Spacewatch/KPNO (Dec. 26.09-12p3)
K17X62H 2017 XH62 (arc=3 opp, H=20.1 ~323m) from ATLAS Mauna Loa (Dec. 25.41-43p4)
K16Y08R 2016 YR8 (arc=2 opp, H=18.9 ~562m) from PS1 (Dec. 25.44-47p4)
K16W10G 2016 WG10 (Q=4.152 AU, arc=3 opp, H=21.0 ~214m) from PS1 (Dec. 25.44-47p3)
K16E85D 2016 ED85 (Q=5.062 AU, arc=3 opp, H=17.7 ~977m) from ATLAS Mauna Loa (Dec. 25.64-66p4)
K15A45S 2015 AS45 (Q=5.237 AU, arc=4 opp, H=17.4 ~1.12 km) from PS2 (Dec. 25.61-64p4)
K13U14X 2013 UX14 (arc=4 opp, H=18.3 ~741m) from ATLAS Haleakala (Dec. 25.39-41p4)
K03B47K 2003 BK47 (Q=4.689 AU, arc=5 opp, H=17.8 ~933m) from ATLAS Mauna Loa (Dec. 25.50-53p4)
K02T67S 2002 TS67 (arc=6 opp, H=19.1 ~513m) from ATLAS Haleakala (Dec. 25.42-45p4)
K02L03G 2002 LG3 (Q=4.124 AU, arc=3 opp, H=19.9 ~355m) from Spacewatch 0.9m (Dec. 26.31-33p3)
K01Y03V 2001 YV3 (arc=3 opp, H=20.4 ~282m) from ATLAS Mauna Loa (Dec. 25.41-42p4)
J99V15X 1999 VX15 (Q=4.807 AU, arc=2 opp, H=18.7 ~616m) from program code "*" (19) via Slooh.com Chile Obs. (Dec. 20.14p1, 20.25p1, 22.11p1, 22.18p1 & 22.26p1) and ATLAS Mauna Loa (Dec. 25.41-44p4)
o6779 506779 2006 YY2 from ATLAS Mauna Loa (Dec. 25.33-35p4)
o6459 506459 2002 AL14 from ATLAS Mauna Loa (Dec. 25.61-63p4)
m3547 483547 2003 WM25 from PS2 (Dec. 25.40-44p4)
m1817 481817 2008 UL90 from PS1 (Dec. 25.24-25p2)
k5749 465749 2009 WO6 from ATLAS Haleakala (Dec. 25.56-57p4)
h8902 438902 2009 WF104 from ATLAS Haleakala (Dec. 25.43-46p4) and Southern Utsunomiya (Dec. 25.68-70p5)
h5404 435404 2008 AT28 from ATLAS Mauna Loa (Dec. 25.48-52p3)
f7217 417217 2005 YS from ATLAS Haleakala (Dec. 25.26-28p4)
f6694 416694 2004 YR32 from ATLAS Haleakala (Dec. 25.52-54p4)
e7653 407653 2011 QF3 from PS1 (Dec. 25.23-26p4)
e3039 403039 2008 AE from PS2 (Dec. 25.57-61p3)
c0359 380359 2002 TN30 from ATLAS Haleakala (Dec. 25.60-62p4)
S3729 283729 2002 UX from ATLAS Mauna Loa (Dec. 25.35-38p3)
O1662 241662 2000 KO44 from ATLAS Mauna Loa (Dec. 25.40-43p4)
M4926 224926 2007 DA41 from PS2 (Dec. 25.34-37p3)
L6707 216707 2004 XP164 from ATLAS Mauna Loa (Dec. 25.52-54p4)
I9040 189040 2000 MU1 from PS1 (Dec. 25.60-63p3)
I6822 186822 2004 FE31 from ATLAS Mauna Loa (Dec. 25.32-38p4)
G3902 163902 2003 SW222 from ATLAS Haleakala (Dec. 25.40-44p4) and Saarbruecken Rastpfuhl Obs. (Dec. 25.97p2)
G3014 163014 2001 UA5 from ATLAS Mauna Loa (Dec. 25.25-27p4)
G2186 162186 1999 OP3 from ATLAS Haleakala (Dec. 25.51-54p4)
G1989 161989 Cacus (1978 CA) from ATLAS Mauna Loa (Dec. 25.63-65p4)
F9402 159402 1999 AP10 from ATLAS Haleakala (Dec. 25.50-53p4)
D8095 138095 2000 DK79 from ATLAS Mauna Loa (Dec. 25.23-25p4)
D7925 137925 2000 BJ19 from ATLAS Mauna Loa (Dec. 25.64-66p4)
D7099 137099 1998 YW3 from PS2 (Dec. 25.41-45p4 & 25.52-56p4)
D6635 136635 1994 VA1 from PS2 (Dec. 25.57-61p3)
B1253 111253 2001 XU10 from PS2 (Dec. 25.57-61p4)
99935 99935 2002 AV4 from ATLAS Haleakala (Dec. 25.52-54p4)
90147 90147 2002 YK14 from ATLAS Haleakala (Dec. 25.43-44p4)
88188 88188 2000 XH44 from ATLAS Haleakala (Dec. 25.49-53p3) and Saarbruecken Rastpfuhl Obs. (Dec. 25.98-99p2)
86039 86039 1999 NC43 from ATLAS Mauna Loa (Dec. 25.20-22p4)
85275 85275 1994 LY from ATLAS Mauna Loa (Dec. 25.32-38p4)
66272 66272 1999 JW6 from ATLAS Haleakala (Dec. 25.27-28p3)
53435 53435 1999 VM40 from PS1 (Dec. 25.37-40p3) and ATLAS Haleakala (Dec. 25.50-53p4)
31221 31221 1998 BP26 from SATINO-1 (2019 Sept. 8.92-93p2)
21374 21374 1997 WS22 from ATLAS Haleakala (Dec. 25.47-48p4)
10150 10150 1994 PN from ATLAS Mauna Loa (Dec. 25.41p3)
09172 9172 Abhramu (1989 OB) from ATLAS Mauna Loa (Dec. 25.25-27p4)
08567 8567 1996 HW1 from ATLAS Mauna Loa (Dec. 25.51-53p4)
08037 8037 1993 HO1 from ATLAS Mauna Loa (Dec. 25.64-66p8)
07753 7753 1988 XB from ATLAS Haleakala (Dec. 25.38-45p5)
07025 7025 1993 QA from PS1 (Dec. 25.26-29p3)
05836 5836 1993 MF from ATLAS Mauna Loa (Dec. 25.34-38p4)
04947 4947 Ninkasi (1988 TJ1) from ATLAS Mauna Loa (Dec. 25.26-28p4)
04055 4055 Magellan (1985 DO2) from ATLAS Mauna Loa (Dec. 25.32-37p4)
03908 3908 Nyx (1980 PA) from ATLAS Mauna Loa (Dec. 25.29-37p4)
03199 3199 Nefertiti (1982 RA) from ATLAS Mauna Loa (Dec. 25.64-67p4)
01981 1981 Midas (1973 EA) from ATLAS Mauna Loa (Dec. 25.23-25p4)
01943 1943 Anteros (1973 EC) from ATLAS Mauna Loa (Dec. 25.63-66p4)
01685 1685 Toro (1948 OA) from ATLAS Mauna Loa (Dec. 25.63-66p4)
01036 1036 Ganymed (1924 TD) from ATLAS Mauna Loa (Dec. 25.43-48p4)
00887 887 Alinda (1918 DB) from ATLAS Mauna Loa (Dec. 25.26-28p4)

MPEC 2020-Y128 - "03:19 UT" - 2020 YD4

K20Y04D 2020 YD4 (H=24.0 ~54m, NHATS) was picked up at 1012 UT on 22 Dec. by PS1, observing it at Dec. 22.43-46p3. This detection was confirmed by Holmes/CTIO (Dec. 23.20-21p3, 24.18-20p3 & 25.21-22p3).

MPEC 2020-Y127 - "02:57 UT" - 2020 YC4

K20Y04C 2020 YC4 (small asteroid, H=24.83 ~37m) was picked up at 1255 UT on 23 Dec. by PS1, observing it at Dec. 23.43-47p3 and 23.54-57p3. This detection was confirmed by Great Shefford Obs. (Dec. 24.93-95p4 & 26.05p2), Schiaparelli Obs. (Dec. 25.11p2 & 26.04-05p2), and Sandlot Obs. (Dec. 25.41-42p3).

Observers on 26 December '20

A total of 29 observers appear in today's MPECs.

Code	Observer / observatory
`H21`	Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2020-Y130, 2020-Y134 & 2020-Y137 -- 2020 YL4, 2020 YG4, 2020 YE4
`T05`	ATLAS Haleakala in Hawaii, 26 in MPECs 2020-Y129 & 2020-Y134 -- 2020 YY2, 2020 YO3, 2020 YL2, 2020 YG4, 2020 XZ4, 2020 WS5, 2020 WM5, 2020 WC5, 2020 WA5, 2013 UX14, 2002 TS67, 99935, 90147, 88188, 66272, 53435, 465749, 438902, 417217, 416694, 380359, 21374, 163902, 162186, 159402, 7753
`T08`	ATLAS Mauna Loa in Hawaii, 38 in MPEC 2020-Y129 -- 2020 YQ3, 2020 YO3, 2017 XH62, 2016 ED85, 2013 YS2, 2012 UK171, 2003 BK47, 2001 YV3, 1999 VX15, 99942, 86039, 85275, 506779, 506459, 435404, 283729, 241662, 216707, 186822, 163014, 161989, 138095, 137925, 10150, 9172, 8567, 8037, 5836, 4947, 4179, 4055, 3908, 3199, 1981, 1943, 1685, 1036, 887
`C77`	Bernezzo Obs. in Italy, 1 in MPEC 2020-Y135 -- 2020 YJ4
`703`	Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2020-Y134 & 2020-Y135 -- 2020 YJ4, 2020 YG4
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPECs 2020-Y128 & 2020-Y129 -- 2020 YL2, 2020 YD4, 2020 XZ3, 2020 XU1, 2020 XR6, 2020 XN5, 2020 XM3, 2020 XF1, 2020 XC7, 2020 XA7, 2020 XA4, 2020 WT5, 2020 WD1
`K87`	Dettelbach Vineyard Obs. in Germany, 2 in MPEC 2020-Y129 -- 2020 YY2, 2012 XE133
`113`	Drebach Obs. in Germany, 1 in MPEC 2020-Y135 -- 2020 YJ4
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2020-Y135 -- 2020 YJ4
`J95`	Great Shefford Obs. in England, 5 in MPECs 2020-Y127, 2020-Y129, 2020-Y130, 2020-Y134 & 2020-Y137 -- 2020 YL4, 2020 YL2, 2020 YG4, 2020 YE4, 2020 YC4
`695^`	Spacewatch via Kitt Peak Natl. Obs. (KPNO) in Arizona, 7 in MPECs 2020-Y129 & 2020-Y131 -- 2020 XV, 2020 XK, 2020 XF, 2020 TJ8, 2020 RQ11, 2020 GN3, 2017 YL6
`K38`	M57 Obs. in Italy, 1 in MPEC 2020-Y135 -- 2020 YJ4
`V01`	Mountainville Obs. in Utah, 2 in MPEC 2020-Y129 -- 2020 XZ4, 2020 XQ6
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2020-Y129, 2020-Y133 & 2020-Y136 -- 2020 YL2, 2020 YK4, 2015 DZ53
`K74`	Muensterschwarzach Obs. in Germany, 3 in MPECs 2020-Y129 & 2020-Y134 -- 2020 YG4, 2020 WS5, 2012 XE133
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 19 in MPECs 2020-Y127, 2020-Y128, 2020-Y129, 2020-Y130, 2020-Y131, 2020-Y133, 2020-Y134, 2020-Y135 & 2020-Y137 -- 2020 YL4, 2020 YJ4, 2020 YG4, 2020 YE4, 2020 YD4, 2020 YC4, 2020 XZ4, 2020 WM5, 2017 YL6, 2016 YR8, 2016 WG10, 2015 DZ53, 2013 FK, 2011 ML, 53435, 481817, 407653, 189040, 7025
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 9 in MPECs 2020-Y129 & 2020-Y134 -- 2020 YG4, 2020 VM3, 2015 AS45, 483547, 403039, 224926, 137099, 136635, 111253
`B49`	Paus Obs. in Spain, 1 in MPEC 2020-Y135 -- 2020 YJ4
`L40`	Saarbruecken Rastpfuhl Obs., 2 in MPEC 2020-Y129 -- 88188, 163902
`H36`	Sandlot Obs. in Kansas, 5 in MPECs 2020-Y127, 2020-Y130, 2020-Y134, 2020-Y136 & 2020-Y137 -- 2020 YL4, 2020 YK4, 2020 YG4, 2020 YE4, 2020 YC4
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y129 -- 31221
`204`	Schiaparelli Obs. in Italy, 5 in MPECs 2020-Y127, 2020-Y129, 2020-Y130, 2020-Y134 & 2020-Y135 -- 2020 YL2, 2020 YJ4, 2020 YG4, 2020 YE4, 2020 YC4
`W88*`	program code "*" (19) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2020-Y129 -- 1999 VX15
`Q21`	Southern Utsunomiya in Japan, 1 in MPEC 2020-Y129 -- 438902
`691`	Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2020-Y129 -- 2020 WH2, 2020 OK5, 2013 YS2, 2002 LG3
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 33 in MPECs 2020-Y129, 2020-Y133, 2020-Y135, 2020-Y136 & 2020-Y137 -- 2020 YZ2, 2020 YY3, 2020 YY2, 2020 YV1, 2020 YQ3, 2020 YQ1, 2020 YP1, 2020 YN3, 2020 YL4, 2020 YL2, 2020 YL1, 2020 YK4, 2020 YJ4, 2020 YE1, 2020 YC4, 2020 YC3, 2020 YB3, 2020 YA3, 2020 YA1, 2020 XU6, 2020 XT4, 2020 XG1, 2020 XC3, 2020 WZ1, 2020 WV5, 2020 WM3, 2020 WC5, 2020 TB12, 2020 SK1, 2020 RO6, 2020 PD1, 2020 PC5, 2015 DZ53
`858`	Tebbutt Obs. in New Mexico, 2 in MPECs 2020-Y134 & 2020-Y137 -- 2020 YL4, 2020 YG4
`T14`	UH/Tholen NEO Follow-Up CFH Telescope in Hawaii, 1 in MPEC 2020-Y132 -- 2015 UH52
`L01`	Visnjan Obs. in Croatia, 6 in MPECs 2020-Y129, 2020-Y130, 2020-Y134, 2020-Y135, 2020-Y136 & 2020-Y137 -- 2020 YL4, 2020 YL2, 2020 YK4, 2020 YJ4, 2020 YG4, 2020 YE4

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

Impact Risk Monitoring on 26 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 YC3	NEODyS	1900	2096-2118	7	1.78e-09	-6.34	-6.88	0	NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2020-12-21.273 to 2020-12-26.224."
2020 YC3	JPL Sentry	1700	2096-2118	8	7.7908e-09	-5.67	-6.13	0	JPL: Computed at 06:32 today Pacific time based on 27 observations spanning 4.9518 days (2020-Dec-21.271836 to 2020-Dec-26.22361). Diameter approximately 0.324 km. from weighted mean H=20.10.

2020 YA3	NEODyS	1900	2049-2119	22	1.51e-05	-5.36	-5.44	0	NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2020-12-21.357 to 2020-12-26.344."
2020 YA3	JPL Sentry	1700	2049-2119	13	1.535775e-05	-5.33	-5.44	0	JPL: Computed at 06:31 today Pacific time based on 31 observations spanning 4.9871 days (2020-Dec-21.355978 to 2020-Dec-26.343071). Diameter approximately 0.021 km. from weighted mean H=26.01.

2020 YL1	NEODyS	1900	2038-2116	4	1.68e-08	-4.75	-4.76	0	NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2020-12-19.376 to 2020-12-26.295."
2020 YL1	JPL Sentry	1700	2038-2116	6	1.642887e-07	-3.85	-3.89	0	JPL: Computed at 06:31 today Pacific time based on 46 observations spanning 6.9188 days (2020-Dec-19.375273 to 2020-Dec-26.294113). Diameter approximately 0.270 km. from weighted mean H=20.52.

2020 YB1	JPL Sentry	1700	2073-2120	19	1.8763583e-05	-5.71	-6.17	0	JPL: Computed at 07:08 Dec. 22nd Pacific time based on 37 observations spanning 4.9333 days (2020-Dec-17.530488 to 2020-Dec-22.463802). Diameter approximately 0.015 km. from weighted mean H=26.81.

2020 YA1	NEODyS	1900	2100-2118	8	8.53e-06	-6.40	-6.77	0	NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2020-12-17.405 to 2020-12-26.443."
2020 YA1	JPL Sentry	1700	2058-2113	5	4.84641e-06	-6.64	-6.78	0	JPL: Computed at 06:39 today Pacific time based on 52 observations spanning 9.0382 days (2020-Dec-17.404234 to 2020-Dec-26.442449). Diameter approximately 0.015 km. from weighted mean H=26.75.

2020 XF	NEODyS	1900	2056-2120	561	1.21e-03	-3.95	-4.09	n/a	NEODyS: "Based on 97 optical observations (of which 2 are rejected as outliers) from 2020-12-04.328 to 2020-12-26.173."
2020 XF	JPL Sentry	1700	2056-2120	137	0.000365612305	-4.54	-5.03	0	JPL: Computed at 06:55 today Pacific time based on 95 observations spanning 21.846 days (2020-Dec-04.32683 to 2020-Dec-26.1726). Diameter approximately 0.015 km. from weighted mean H=26.72.

2019 YV4	JPL Sentry	1700	2035-2049	4	6.18581e-08	-7.84	-7.94	0	JPL: Computed at 20:58 Dec. 31st of 2019 Pacific time based on 17 observations spanning .56526 days (2019-Dec-30.36984 to 2019-Dec-30.935097). Diameter approximately 0.012 km. from weighted mean H=27.31.

2016 RP41	JPL Sentry	1700	2022-2114	48	1.54046e-08	-5.96	-6.36	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.

2015 UH52	NEODyS	2330	R E M O V E D						-
2015 UH52	JPL Sentry	1700	R E M O V E D						JPL: Risk listing removed at 1616 UTC today

2014 XM7	JPL Sentry	1700	2115-2115	1	6.157e-08	-6.48	-6.48	0	JPL: Computed at 07:02 July 25th Pacific time based on 53 observations spanning 46.903 days (2014-Nov-13.307743 to 2014-Dec-30.210874). Diameter approximately 0.090 km. from weighted mean H=22.88.

2007 YS56	JPL Sentry	1700	2104-2113	3	4.20304e-06	-6.12	-6.39	0	JPL: Computed at 07:07 April 10th of 2017 Pacific time based on 49 observations spanning 11.051 days (2007-Dec-31.24562 to 2008-Jan-11.29675). Diameter approximately 0.023 km. from weighted mean H=25.82.

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 26 December '20

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

2330	Noted that NEODyS has removed 2015 UH52 as an impact risk - see above Grabbed MPEC 2020-Y135 - 2020 YJ4 - see above Grabbed MPEC 2020-Y136 - 2020 YK4 - see above Grabbed MPEC 2020-Y137 - 2020 YL4 - see above
1900	Noted that NEODyS has updated its 2020 XF risk assessment - see above Noted that NEODyS has updated its 2020 YA1 risk assessment - see above Noted that NEODyS has updated its 2020 YA3 risk assessment - see above Noted that NEODyS has updated its 2020 YC3 risk assessment - see above Noted that NEODyS has updated its 2020 YL1 risk assessment - see above
1731	Grabbed MPEC 2020-Y134 - 2020 YG4 - see above
1700	Noted that JPL Sentry has updated its 2007 YS56 risk assessment - see above Noted that JPL Sentry has updated its 2014 XM7 risk assessment - see above Noted that JPL Sentry has removed 2015 UH52 as an impact risk - see above Noted that JPL Sentry has updated its 2016 RP41 risk assessment - see above Noted that JPL Sentry has updated its 2019 YV4 risk assessment - see above Noted that JPL Sentry has updated its 2020 XF risk assessment - see above Noted that JPL Sentry has updated its 2020 YA1 risk assessment - see above Noted that JPL Sentry has updated its 2020 YA3 risk assessment - see above Noted that JPL Sentry has updated its 2020 YB1 risk assessment - see above Noted that JPL Sentry has updated its 2020 YC3 risk assessment - see above Noted that JPL Sentry has updated its 2020 YL1 risk assessment - see above Grabbed MPEC 2020-Y129 - Daily Orbit Update - see above Grabbed MPEC 2020-Y130 - 2020 YE4 - see above Grabbed MPEC 2020-Y131 - 2017 YL6 - see above Grabbed MPEC 2020-Y132 - 2015 UH52 - see above Grabbed MPEC 2020-Y133 - 2015 DZ53 - see above
0540	Grabbed MPEC 2020-Y127 - 2020 YC4 - see above Grabbed MPEC 2020-Y128 - 2020 YD4 - see above

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