2020-02-29 Tracking News

Contents on 29 February '20

IAU Minor Planet Center
- NEOCP Activity -- 25 listings
- New MPECs -- fifteen MPECs
Observers -- 40 observers
Impact Risk Monitoring -- twelve objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 1110 risk-listed objects, 62 have had news in the last 31 days. Updated at 2233 UTC on 29 Feb.
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 29 February '20

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 42 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 29 February '20

Minor Planet Electronic Circulars

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

MPEC 2020-D135 time-stamped "01:27 UT" - 2020 DF4 - see below
MPEC 2020-D136 time-stamped "01:36 UT" - 2020 DG4 - see below
MPEC 2020-D137 time-stamped "12:00 UT" - Daily Orbit Update - see below
MPEC 2020-D138 time-stamped "14:42 UT" - 2020 DH4 - see below
MPEC 2020-D139 time-stamped "14:49 UT" - 2020 DJ4 - see below
MPEC 2020-D140 time-stamped "14:51 UT" - 2020 DK4 - see below
MPEC 2020-D141 time-stamped "14:58 UT" - 2020 DL4 - see below
MPEC 2020-D142 time-stamped "15:00 UT" - 2019 GD20 - see below
MPEC 2020-D143 time-stamped "18:57 UT" - 2020 DM4 - see below
MPEC 2020-D144 time-stamped "19:00 UT" - 2020 CE3 - see below
MPEC 2020-D145 time-stamped "19:02 UT" - 2020 DN4 - see below
MPEC 2020-D146 time-stamped "19:03 UT" - 2020 DO4 - see below
MPEC 2020-D147 time-stamped "19:04 UT" - 2020 DP4 - see below
MPEC 2020-D148 time-stamped "19:06 UT" - 2020 DQ4 - see below
MPEC 2020-D149 time-stamped "19:12 UT" - 2020 DR4

MPEC 2020-D149 - "19:12 UT" - 2020 DR4

K20D04R 2020 DR4 (risk listed, Earth MOID=0.2 LD, H=29.7 ~4m, close passer) was picked up at 0301 UT on 27 Feb. by the Mt. Lemmon Survey (MLS), observing it at Feb. 27.13-14p3. This detection was confirmed by Steward Obs. Mt. Lemmon Station (Feb. 27.29p4), ESA Optical Ground Station (ESA OGS) (Feb. 28.86-88p3), and Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Feb. 29.02-04p3).

MPEC 2020-D148 - "19:06 UT" - 2020 DQ4

K20D04Q 2020 DQ4 (small asteroid, H=25.8 ~23m) was picked up at 0713 UT on 27 Feb. by MLS, observing it at Feb. 27.30-31p3 and 27.47p2. This detection was confirmed by ESA OGS (Feb. 27.94-95p3), Holmes/CTIO (Feb. 28.17-18p3 & 29.23-24p3), Astronomical Research Obs. Westfield (Feb. 28.22-23p3), Farpoint Obs. (Feb. 29.23-24p4), and Steward Mt. Lemmon Sta. (Feb. 29.23-24p4).

MPEC 2020-D147 - "19:04 UT" - 2020 DP4

K20D04P 2020 DP4 (risk listed, Earth MOID=0.1 LD, H=25.2 ~31m, close passer) was picked up at 0905 UT on 27 Feb. by MLS, observing it at Feb. 27.38-40p4 and 27.48-52p3. This detection was confirmed by ESA OGS (Feb. 28.23-26p3 & 29.01-03p3), Sandlot Obs. (Feb. 29.24-27p5), Holmes/CTIO (Feb. 29.27-28p3), and Farpoint Obs. (Feb. 29.40-43p4).

MPEC 2020-D146 - "19:03 UT" - 2020 DO4

K20D04O 2020 DO4 (Earth MOID=2.6 LD, H=27.5 ~11m) was picked up at 0838 UT on 27 Feb. by MLS, observing it at Feb. 27.36-38p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Feb. 27.49-50p4 & 29.26p4), ESA OGS (Feb. 28.01p3), Holmes/CTIO (Feb. 28.19-20p3 & 29.25-26p3), ARO Westfield (Feb. 28.26-27p3), Visnjan Obs. (Feb. 28.98-99p3), and Pascoli Obs. (Feb. 28.99p2).

MPEC 2020-D145 - "19:02 UT" - 2020 DN4

K20D04N 2020 DN4 (Earth MOID=3.4 LD, H=27.9 ~9m) was picked up at 0907 UT on 27 Feb. by MLS, observing it at Feb. 27.38-40p4 and 27.48p4. This detection was confirmed by ESA OGS (Feb. 28.21-22p3 & 29.16-18p3), ARO Westfield (Feb. 28.28-30p4), Holmes/CTIO (Feb. 29.28-29p3), Farpoint Obs. (Feb. 29.28-31p4), Steward Mt. Lemmon Sta. (Feb. 29.28p1 & 29.33p1), and Sandlot Obs. (Feb. 29.30-33p3).

MPEC 2020-D144 - "19:00 UT" - 2020 CE3

K20C03E 2020 CE3 (small asteroid, H=24.5 ~43m) was picked up at 0932 UT on 5 Feb. by MLS, observing it at Feb. 5.40-41p4 and 6.41-42p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Feb. 5.50-51p4 at G=22.3-8).

MPEC 2020-D143 - "18:57 UT" - 2020 DM4

K20D04M 2020 DM4 (H=21.7 ~155m) was picked up at 1619 UT on 26 Feb. by Purple Mtn. Obs. Xuyi Station, observing it at Feb. 26.68-71p3. This detection was confirmed by Steward Mt. Lemmon Sta. (Feb. 27.27-30p4), ESA OGS (Feb. 28.01-02p3 & 29.00p2), SATINO-1 (Feb. 28.17-19p2), Tebbutt Obs. (Feb. 28.25-28p3), Sandlot Obs. (Feb. 28.33-35p3), MPC code O49 (Feb. 28.74-75p2), Abastumani Obs. (Feb. 28.80-81p3), GiaGa Obs. (Feb. 28.93-97p2), Farra d'Isonzo Obs. (Feb. 28.97-01p3), Visnjan Obs. (Feb. 29.01-03p3), and Holmes/CTIO (Feb. 29.26-27p3).

MPEC 2020-D142 - "15:00 UT" - 2019 GD20

K19G20D 2019 GD20 (H=21.3 ~186m) from Calar Alto Schmidt (Feb. 28.09-12p4) and ESA OGS (Feb. 29.13-14p3)

MPEC 2020-D141 - "14:58 UT" - 2020 DL4

K20D04L 2020 DL4 (small asteroid, H=24.3 ~47m) was picked up at 0606 UT on 27 Feb. by MLS, observing it at Feb. 27.25-27p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Feb. 27.37-38p4, 28.17p3 & 29.18-20p4), ESA OGS (Feb. 27.89-90p3), Holmes/CTIO (Feb. 28.09-10p3 & 29.19-20p2), ARO Westfield (Feb. 28.25-26p4), and Visnjan Obs. (Feb. 28.94-95p3).

MPEC 2020-D140 - "14:51 UT" - 2020 DK4

K20D04K 2020 DK4 (small asteroid, H=24.7 ~39m) was picked up at 0639 UT on 27 Feb. by MLS, observing it at Feb. 27.28-29p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Feb. 27.42-43p3 at G=21.1-22.1 & 29.22-23p4 at G=21.3-8), ESA OGS (Feb. 27.93-94p2), Holmes/CTIO (Feb. 28.16-17p3 & 29.22p3), Visnjan Obs. (Feb. 28.97p3), ARO Westfield (Feb. 29.21-22p3), and Farpoint Obs. (Feb. 29.25-27p4).

MPEC 2020-D139 - "14:49 UT" - 2020 DJ4

K20D04J 2020 DJ4 (small asteroid, H=22.9 ~89m) was picked up at 0512 UT on 27 Feb. by MLS, observing it at Feb. 27.22-23p3 and 28.22p3. This detection was confirmed by McDonald Obs. (Feb. 27.28-29p3), Steward Mt. Lemmon Sta. (Feb. 27.39-40p3, 28.22-23p4 & 29.14-15p4), ESA OGS (Feb. 27.86-87p2), Holmes/CTIO (Feb. 28.08-09p3 & 29.05-07p3), and ARO Westfield (Feb. 29.16-17p3).

MPEC 2020-D138 - "14:42 UT" - 2020 DH4

K20D04H 2020 DH4 (small asteroid, H=24.4 ~45m) was picked up at 0944 UT on 27 Feb. by MLS, observing it at Feb. 27.41-42p4 and 27.51p4. This detection was confirmed by ESA OGS (Feb. 27.98-99p3), ARO Westfield (Feb. 28.26-27p4), Visnjan Obs. (Feb. 28.99-00p3), Farpoint Obs. (Feb. 29.34p1 & 29.38-39p3), and Sandlot Obs. (Feb. 29.36-39p3).

<< DOU on 29 February '20 >> MPEC 2020-D137 - "12:00 UT" - Daily Orbit Update

Observations of risk-listed objects
K20D03N 2020 DN3 (small asteroid, arc=3 days, H=26.8 ~15m, close passer) from Steward Mt. Lemmon Sta. (Feb. 29.24p4)
K20D03F 2020 DF3 (small asteroid, i=36.6°, arc=5 days, H=24.1 ~51m, close passer) from the Spacewatch 0.9m telescope (Feb. 29.37-39p3) and Steward Mt. Lemmon Sta. (Feb. 29.47p3)
K20D02R 2020 DR2 (arc=9 days, H=18.8 ~589m) from ESA OGS (Feb. 28.85p3)
K20D02O 2020 DO2 (small asteroid, arc=5 days, H=26.9 ~14m, close passer) from UH/Tholen NEO Follow-Up 2.24m Telescope (Feb. 25.55p1 at G=24.16)
K20D02F 2020 DF2 (small asteroid, arc=10 days, H=26.2 ~19m, close passer) from the Spacewatch 1.8m telescope (Feb. 29.39-42p3 at R=22.2)
K20D00W 2020 DW (small asteroid, arc=3 days, H=30.4 ~3m, close passer, NHATS target) from Great Shefford Obs. (Feb. 18.92-93p3 & 19.03-04p3) and Tholen 2.24m (Feb. 19.22p2)
K20C02F 2020 CF2 (small asteroid, arc=16 days, H=27.5 ~11m, close passer, NHATS target) from Spacewatch 1.8m (Feb. 29.43-45p3)
K20C01Q 2020 CQ1 (small asteroid, arc=22 days, H=28.9 ~6m, close passer, NHATS target) from program code "#" (12) via DECam (Feb. 21.33-36p3 at G=23.6-7)
K20B00H 2020 BH (small asteroid, arc=38 days, H=28.2 ~8m, close passer, NHATS target) from Tholen 2.24m (Feb. 1.58p1 at G=22.31 & 25.59p1 at G=24.30)
Observations of close-passing objects
K20D03Z 2020 DZ3 (arc=2 days, H=25.5 ~27m) from Crni Vrh Obs. (Feb. 28.87p4) and ESA OGS (Feb. 29.00p3)
K20D03W 2020 DW3 (arc=2 days, H=28.4 ~7m, NHATS target) from Steward Mt. Lemmon Sta. (Feb. 29.24p4)
K20D03V 2020 DV3 (arc=1 day, H=27.8 ~9m) from Squirrel Valley Obs. (Feb. 28.16-18p3)
K20D03S 2020 DS3 (arc=3 days, H=25.9 ~22m, NHATS target) from Steward Mt. Lemmon Sta. (Feb. 29.24-25p4)
K20D03G 2020 DG3 (arc=4 days, H=27.5 ~11m, NHATS target) from Steward Mt. Lemmon Sta. (Feb. 29.15-17p3)
K20D03E 2020 DE3 (arc=5 days, H=23.9 ~56m) from Steward Mt. Lemmon Sta. (Feb. 29.48p4)
K20D03D 2020 DD3 (arc=5 days, H=24.9 ~35m) from Steward Mt. Lemmon Sta. (Feb. 29.25p4)
K20D02M 2020 DM2 (arc=9 days, H=27.2 ~12m, NHATS target) from Steward Mt. Lemmon Sta. (Feb. 29.48p3)
K20C02V 2020 CV2 (Q=4.058 AU, arc=13 days, H=25.8 ~23m) from ARO Westfield (Feb. 28.30-31p3 at V=22.0-22.2)
K20B01B 2020 BB1 from ARO Westfield (Jan. 22.29-30p5)
Observation campaigns (NHATS targets, radar support)
K20D00Y 2020 DY (arc=12 days, H=25.4 ~28m, NHATS) from Steward Mt. Lemmon Sta. (Feb. 29.11-12p4)
K20C01J 2020 CJ1 (NHATS) from Tholen 2.24m (Feb. 25.66p2)
K17BC3M 2017 BM123 (arc=3 opp, H=23.9 ~56m, NHATS, radar) from program code 1 via Kitab Obs. (Feb. 28.96p4) and Petit Jean Mtn. South Obs. (PJMSO) (Feb. 29.35p6)
K09C00E 2009 CE (arc=2 opp, H=24.3 ~47m, NHATS) from Spacewatch 0.9m (Feb. 29.39-41p2)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small asteroids (H>22.0)
K20D03Y 2020 DY3 (arc=2 days, H=24.8 ~37m) from Farra d'Isonzo Obs. (Feb. 28.85-88p4), Crni Vrh Obs. (Feb. 28.86p3), and Visnjan Obs. (Feb. 28.86-87p5)
K20D03Q 2020 DQ3 (arc=3 days, H=25.0 ~34m) from Steward Mt. Lemmon Sta. (Feb. 29.47p4)
K20D03J 2020 DJ3 (arc=4 days, H=24.4 ~45m) from Steward Mt. Lemmon Sta. (Feb. 29.12-14p4)
K20D02L 2020 DL2 (arc=8 days, H=26.5 ~17m) from ARO Westfield (Feb. 28.34-35p3 at V=22.1-2)
K20D02A 2020 DA2 (arc=11 days, H=22.7 ~98m) from Steward Mt. Lemmon Sta. (Feb. 29.48-49p2)
K20C00E 2020 CE (arc=37 days, H=25.0 ~34m) from ARO Westfield (Feb. 28.42-43p4 at V=21.8-22.3)
K20B15N 2020 BN15 (arc=36 days, H=25.2 ~31m) from ARO Westfield (Feb. 28.38-40p3 at V=22.0-22.5)
K20B11J 2020 BJ11 (arc=58 days, H=24.8 ~37m) from Farpoint Obs. (Feb. 29.17-19p4)
K20B05C 2020 BC5 (arc=38 days, H=25.3 ~29m) from ARO Westfield (Feb. 28.32-33p3 at V=22.6-8)
K15Bo9K 2015 BK509 (arc=2 opp, H=22.4 ~112m) from Kitab Obs./code 1 (Feb. 24.63-64p4) and Castelmartini Obs. (Feb. 28.80-81p6)
Observations of other objects
K20D03T 2020 DT3 (arc=11 days, H=21.5 ~170m) from Tebbutt Obs. (Feb. 28.17-18p3)
K20D03C 2020 DC3 from PJMSO (Feb. 29.35-36p6)
K20D02S 2020 DS2 (Q=4.333 AU, arc=10 days, H=21.7 ~155m) from Steward Mt. Lemmon Sta. (Feb. 29.21-22p3)
K20D02P 2020 DP2 (Q=4.713 AU, arc=9 days, H=21.5 ~170m) from Steward Mt. Lemmon Sta. (Feb. 29.25-27p4) and PJMSO (Feb. 29.39-40p6)
K20D00X 2020 DX (arc=13 days, H=20.2 ~309m) from Povegliano Veronese Obs. (Feb. 28.87-88p4) and Farpoint Obs. (Feb. 29.13p4)
K20D00Q 2020 DQ (arc=13 days, H=21.5 ~170m) from Steward Mt. Lemmon Sta. (Feb. 29.10p4)
K20C02L 2020 CL2 (q=0.363 AU, arc=25 days, H=19.5 ~426m) from PJMSO (Feb. 29.36p6)
K20B14P 2020 BP14 from Peschiera del Garda Obs. (Feb. 28.77-81p6)
K20B12Z 2020 BZ12 (i=165.5°, Q=14.788 AU, arc=40 days, H=18.2 ~776m) from Kitab Obs./code 1 (Feb. 24.64-65p4) and Castelmartini Obs. (Feb. 28.85-86p3)
K20B12S 2020 BS12 (q=0.379 AU, arc=37 days, H=20.1 ~323m) from Spacewatch 1.8m (Feb. 29.46-47p3)
K20B11F 2020 BF11 from Pomona College Table Mtn. Obs. (PCTMO) (Jan. 28.37-44p5)
K20B05O 2020 BO5 (arc=39 days, H=20.9 ~224m) from ATLAS Mauna Loa (Feb. 28.53-56p4)
K20B02E 2020 BE2 (arc=41 days, H=20.2 ~309m) from Farpoint Obs. (Feb. 29.15-17p3)
K19Y04S 2019 YS4 (arc=62 days, H=19.9 ~355m) from WISE (Feb. 26.12p1, 26.25p1, 26.39p1, 26.45p1 & 26.58p1)
K19Y04R 2019 YR4 (arc=93 days, H=18.6 ~645m) from Farpoint Obs. (Feb. 29.07-09p4)
K19X01G 2019 XG1 (Q=4.163 AU, arc=2 opp, H=19.2 ~490m) from Peschiera del Garda Obs. (Feb. 28.95-98p5) and PJMSO (Feb. 29.34p6)
K19W06B 2019 WB6 (arc=96 days, H=20.7 ~245m) from Peschiera del Garda Obs. (Feb. 28.91-94p5) and PJMSO (Feb. 29.33p6)
K19U00O 2019 UO (Q=4.343 AU, arc=148 days, H=20.1 ~323m) from ATLAS Mauna Loa (Feb. 28.51-53p4) and Farpoint Obs. (Feb. 29.21-22p5)
K19S06H 2019 SH6 from PJMSO (Feb. 29.41-42p5)
K17B31P 2017 BP31 (arc=3 opp, H=19.8 ~371m) from Farpoint Obs. (Feb. 29.14-15p4) and Spacewatch 0.9m (Feb. 29.18p3)
K16W01E 2016 WE1 (arc=4 opp, H=19.5 ~426m) from Farpoint Obs. (Feb. 29.11-12p4)
K16L09E 2016 LE9 (arc=6 opp, H=17.8 ~933m) from ATLAS Mauna Loa (Feb. 28.46-50p8)
K16H19D 2016 HD19 (q=0.351 AU, arc=4 opp, H=18.9 ~562m) from ARO Westfield (Feb. 28.33p2 at V=22.1-5)
K16EF7E 2016 EE157 (arc=3 opp, H=20.8 ~234m) from ARO Westfield (Feb. 22.33-34p3 at V=22.1-4)
K15M66O 2015 MO66 (arc=4 opp, H=20.1 ~323m) from ARO Westfield (Feb. 28.39-40p3 at V=22.1-3)
K15FX2P 2015 FP332 (i=36.5°, Q=4.790 AU, arc=5 opp, H=17.3 ~1.17 km) from SATINO-1 (Feb. 27.07-11p3)
K06P17Y 2006 PY17 (arc=6 opp, H=19.2 ~490m) from ATLAS Mauna Loa (Feb. 28.61-64p4)
K03O03C 2003 OC3 (arc=5 opp, H=18.8 ~589m) from Castelmartini Obs. (Feb. 28.78p3)
K03M02S 2003 MS2 (arc=3 opp, H=21.2 ~195m) from ARO Westfield (Feb. 28.42-43p3 at V=21.8-22.1)
K03B01N 2003 BN1 (i=61.1°, arc=8 days, H=20.1 ~323m) from NEAT's Mt. Palomar telescope (2003 Jan. 26.22-26p3)
K00E70U 2000 EU70 (arc=5 opp, H=18.9 ~562m) from ARO Westfield (Feb. 28.36p2 at V=22.1-2)
K00B28O 2000 BO28 (arc=7 opp, H=19.7 ~389m) from PJMSO (Feb. 29.37p6)
n4880 494880 2008 SQ7 from ATLAS Mauna Loa (Feb. 28.57-60p4)
j8732 458732 2011 MD5 from WISE (Feb. 26.38p1, 26.64p1, 26.77p1, 26.90p1, 27.03p1, 27.16p2, 27.29p1, 27.36p2, 27.42p1, 27.55p2, 27.69p1, 27.75p1 & 28.27p1)
Z3947 353947 1999 CT8 from Pascoli Obs. (Feb. 28.79-80p3)
X1509 331509 1999 YA from ARO Westfield (Feb. 28.36-37p3 at V=21.9-22.3)
W5102 325102 2008 EY5 from Pan-STARRS 1 (PS1) (2016 Feb. 19.62p2, Jan. 25.64-66p4 & 28.64-65p3)
R6397 276397 2002 XA40 from Moose Springs Obs. (Feb. 28.29-35p3)
F9929 159929 2005 UK from WISE (Feb. 27.01p1, 27.15p1, 27.28p1, 27.60p2, 27.87p1, 27.93p2, 27.99p1, 28.06p1, 28.19p1 & 28.39p1)
B5052 115052 2003 RD6 from ATLAS Mauna Loa (Feb. 28.51-53p4)
90075 90075 2002 VU94 from Geyserland Obs. (Feb. 28.48-50p2)
86667 86667 2000 FO10 from ATLAS Mauna Loa (Feb. 28.61-63p4)
65690 65690 1991 DG from Geyserland Obs. (Feb. 28.53-54p3)
54686 54686 2001 DU8 from Geyserland Obs. (Feb. 28.60-63p4)
52768 52768 1998 OR2 from Olmen Obs. (Feb. 28.04-05p3)
40267 40267 1999 GJ4 from Geyserland Obs. (Feb. 28.39p1)
35107 35107 1991 VH from PJMSO (Feb. 29.32-33p6)
30825 30825 1990 TG1 from Castelmartini Obs. (Feb. 28.85p3)
11885 11885 Summanus (1990 SS) from WISE (Feb. 27.66p1, 27.72p1, 27.79p1, 27.92p1, 27.98p2, 28.05p1, 28.11p1 & 28.25p1)
11405 11405 1999 CV3 from Castelmartini Obs. (Feb. 28.82p3)
08566 8566 1996 EN from Geyserland Obs. (Feb. 28.51-55p4)
07088 7088 Ishtar (1992 AA) from Geyserland Obs. (Feb. 28.64-66p5)
05626 5626 1991 FE from Geyserland Obs. (Feb. 28.46p3)
04954 4954 Eric (1990 SQ) from ATLAS Mauna Loa (Feb. 28.60-63p4)

MPEC 2020-D136 - "01:36 UT" - 2020 DG4

K20D04G 2020 DG4 (risk listed, Earth MOID=1.2 LD, H=28.3 ~7m, close passer, NHATS target) was picked up at 0703 UT on 27 Feb. by MLS, observing it at Feb. 27.29-31p4 and 28.28-29p4. This detection was confirmed by McDonald Obs. (Feb. 27.34p3), Steward Mt. Lemmon Sta. (Feb. 27.46p3 & 28.20-21p4), ESA OGS (Feb. 27.96-97p3 & 28.98-99p3), Holmes/CTIO (Feb. 28.19-20p3), and ARO Westfield (Feb. 28.24-25p3).

MPEC 2020-D135 - "01:27 UT" - 2020 DF4

K20D04F 2020 DF4 (small asteroid, H=26.2 ~19m) was picked up at 0642 UT on 27 Feb. by MLS, observing it at Feb. 27.28-29p3 and 28.27p4. This detection was confirmed by Steward Mt. Lemmon Sta. (Feb. 27.45-46p4 & 28.21-22p4), ESA OGS (Feb. 27.91-92p3), Holmes/CTIO (Feb. 28.14-16p4), the Bok Telescope (Feb. 28.23-25p3), Visnjan Obs. (Feb. 28.92-93p4), Pascoli Obs. (Feb. 28.94-95p3), and San Marcello Pistoiese Obs. (Feb. 28.97-98p2).

Observers on 29 February '20

A total of 40 observers appear in today's MPECs.

Code	Observer / observatory
`119`	Abastumani Obs. in Georgia, 1 in MPEC 2020-D143 -- 2020 DM4
`H21`	Astronomical Research Obs. Westfield in Illinois, 20 in MPECs 2020-D136, 2020-D137, 2020-D138, 2020-D139, 2020-D140, 2020-D141, 2020-D145, 2020-D146 & 2020-D148 -- 2020 DQ4, 2020 DO4, 2020 DN4, 2020 DL4, 2020 DL2, 2020 DK4, 2020 DJ4, 2020 DH4, 2020 DG4, 2020 CV2, 2020 CE, 2020 BN15, 2020 BC5, 2020 BB1, 2016 HD19, 2016 EE157, 2015 MO66, 2003 MS2, 2000 EU70, 331509
`T08`	ATLAS Mauna Loa in Hawaii, 8 in MPEC 2020-D137 -- 2020 BO5, 2019 UO, 2016 LE9, 2006 PY17, 86667, 494880, 115052, 4954
`V00`	Bok Telescope in Arizona, 1 in MPEC 2020-D135 -- 2020 DF4
`Z84`	Calar Alto Schmidt in Spain, 1 in MPEC 2020-D142 -- 2019 GD20
`160`	Castelmartini Obs. in Italy, 5 in MPEC 2020-D137 -- 2020 BZ12, 2015 BK509, 2003 OC3, 30825, 11405
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2020-D135, 2020-D136, 2020-D139, 2020-D140, 2020-D141, 2020-D143, 2020-D145, 2020-D146, 2020-D147, 2020-D148 & 2020-D149 -- 2020 DR4, 2020 DQ4, 2020 DP4, 2020 DO4, 2020 DN4, 2020 DM4, 2020 DL4, 2020 DK4, 2020 DJ4, 2020 DG4, 2020 DF4
`106`	Crni Vrh Obs. in Slovenia, 2 in MPEC 2020-D137 -- 2020 DZ3, 2020 DY3
`W84#`	program code "#" (12) via DECam in Chile, 1 in MPEC 2020-D137 -- 2020 CQ1
`J04`	ESA Optical Ground Station (ESA OGS) in the Canary Islands, 15 in MPECs 2020-D135, 2020-D136, 2020-D137, 2020-D138, 2020-D139, 2020-D140, 2020-D141, 2020-D142, 2020-D143, 2020-D145, 2020-D146, 2020-D147, 2020-D148 & 2020-D149 -- 2020 DZ3, 2020 DR4, 2020 DR2, 2020 DQ4, 2020 DP4, 2020 DO4, 2020 DN4, 2020 DM4, 2020 DL4, 2020 DK4, 2020 DJ4, 2020 DH4, 2020 DG4, 2020 DF4, 2019 GD20
`734`	Farpoint Obs. in Kansas, 12 in MPECs 2020-D137, 2020-D138, 2020-D140, 2020-D145, 2020-D147 & 2020-D148 -- 2020 DX, 2020 DQ4, 2020 DP4, 2020 DN4, 2020 DK4, 2020 DH4, 2020 BJ11, 2020 BE2, 2019 YR4, 2019 UO, 2017 BP31, 2016 WE1
`595`	Farra d'Isonzo Obs. in Italy, 2 in MPECs 2020-D137 & 2020-D143 -- 2020 DY3, 2020 DM4
`E89`	Geyserland Obs. in New Zealand, 7 in MPEC 2020-D137 -- 90075, 65690, 54686, 40267, 8566, 7088, 5626
`203`	GiaGa Obs. in Italy, 1 in MPEC 2020-D143 -- 2020 DM4
`J95`	Great Shefford Obs. in England, 1 in MPEC 2020-D137 -- 2020 DW
`1861`	program code 1 via Kitab Obs., 3 in MPEC 2020-D137 -- 2020 BZ12, 2017 BM123, 2015 BK509
`711`	McDonald Obs. in Texas, 2 in MPECs 2020-D136 & 2020-D139 -- 2020 DJ4, 2020 DG4
`V14`	Moose Springs Obs., 1 in MPEC 2020-D137 -- 276397
`O49`	MPC code O49, 1 in MPEC 2020-D143 -- 2020 DM4
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2020-D135, 2020-D136, 2020-D138, 2020-D139, 2020-D140, 2020-D141, 2020-D144, 2020-D145, 2020-D146, 2020-D147, 2020-D148 & 2020-D149 -- 2020 DR4, 2020 DQ4, 2020 DP4, 2020 DO4, 2020 DN4, 2020 DL4, 2020 DK4, 2020 DJ4, 2020 DH4, 2020 DG4, 2020 DF4, 2020 CE3
`644`	NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2020-D137 -- 2003 BN1
`C23`	Olmen Obs. in Belgium, 1 in MPEC 2020-D137 -- 52768
`F51`	Pan-STARRS 1 in Hawaii, 1 in MPEC 2020-D137 -- 325102
`K63`	Pascoli Obs. in Italy, 3 in MPECs 2020-D135, 2020-D137 & 2020-D146 -- 2020 DO4, 2020 DF4, 353947
`A53`	Peschiera del Garda Obs. in Italy, 3 in MPEC 2020-D137 -- 2020 BP14, 2019 XG1, 2019 WB6
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2020-D137 -- 2020 DP2, 2020 DC3, 2020 CL2, 2019 XG1, 2019 WB6, 2019 SH6, 2017 BM123, 2000 BO28, 35107
`654`	Pomona College Table Mtn. Obs. in southern California, 1 in MPEC 2020-D137 -- 2020 BF11
`A48`	Povegliano Veronese Obs. in Italy, 1 in MPEC 2020-D137 -- 2020 DX
`D29`	Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2020-D143 -- 2020 DM4
`104`	San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2020-D135 -- 2020 DF4
`H36`	Sandlot Obs. in Kansas, 4 in MPECs 2020-D138, 2020-D143, 2020-D145 & 2020-D147 -- 2020 DP4, 2020 DN4, 2020 DM4, 2020 DH4
`C95`	SATINO-1 in France, 2 in MPECs 2020-D137 & 2020-D143 -- 2020 DM4, 2015 FP332
`691`	Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2020-D137 -- 2020 DF3, 2017 BP31, 2009 CE
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2020-D137 -- 2020 DF2, 2020 CF2, 2020 BS12
`W34`	Squirrel Valley Obs. in North Carolina, 1 in MPEC 2020-D137 -- 2020 DV3
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 26 in MPECs 2020-D135, 2020-D136, 2020-D137, 2020-D139, 2020-D140, 2020-D141, 2020-D143, 2020-D144, 2020-D145, 2020-D146, 2020-D148 & 2020-D149 -- 2020 DY, 2020 DW3, 2020 DS3, 2020 DS2, 2020 DR4, 2020 DQ4, 2020 DQ3, 2020 DQ, 2020 DP2, 2020 DO4, 2020 DN4, 2020 DN3, 2020 DM4, 2020 DM2, 2020 DL4, 2020 DK4, 2020 DJ4, 2020 DJ3, 2020 DG4, 2020 DG3, 2020 DF4, 2020 DF3, 2020 DE3, 2020 DD3, 2020 DA2, 2020 CE3
`858`	Tebbutt Obs. in New Mexico, 2 in MPECs 2020-D137 & 2020-D143 -- 2020 DT3, 2020 DM4
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 4 in MPEC 2020-D137 -- 2020 DW, 2020 DO2, 2020 CJ1, 2020 BH
`L01`	Visnjan Obs. in Croatia, 7 in MPECs 2020-D135, 2020-D137, 2020-D138, 2020-D140, 2020-D141, 2020-D143 & 2020-D146 -- 2020 DY3, 2020 DO4, 2020 DM4, 2020 DL4, 2020 DK4, 2020 DH4, 2020 DF4
`C51`	WISE in Earth polar orbit, 4 in MPEC 2020-D137 -- 2019 YS4, 458732, 159929, 11885

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

Impact Risk Monitoring on 29 February '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 DR4	JPL Sentry	2100	2039-2064	4	1.21656e-07	-9.08	-9.39	0	JPL: Computed at 12:39 today Pacific time based on 13 observations spanning 1.9104 days (2020-Feb-27.12578 to 2020-Feb-29.03616). Diameter approximately 0.004 km. from weighted mean H=29.71.

2020 DP4	JPL Sentry	2100	2074-2117	31	2.8177716e-06	-5.91	-6.00	0	JPL: Computed at 12:38 today Pacific time based on 25 observations spanning 2.0474 days (2020-Feb-27.3785 to 2020-Feb-29.42591). Diameter approximately 0.032 km. from weighted mean H=25.15.

2020 DG4	NEODyS	2100	2085-2117	18	4.85e-06	-7.25	-7.82	0	NEODyS: "Based on 30 optical observations (of which 1 are rejected as outliers) from 2020-02-27.295 to 2020-02-28.997."
2020 DG4	JPL Sentry	0530	2047-2120	18	1.3029646e-05	-6.82	-7.36	0	JPL: Computed at 19:08 Feb. 28th Pacific time based on 29 observations spanning 1.7017 days (2020-Feb-27.29404 to 2020-Feb-28.995738). Diameter approximately 0.007 km. from weighted mean H=28.28.

2020 DN3	NEODyS	2100	2104-2117	8	2.56e-07	-7.65	-8.08	0	NEODyS: "Based on 61 optical observations (of which 0 are rejected as outliers) from 2020-02-26.217 to 2020-02-29.242."
2020 DN3	JPL Sentry	1700	2107-2119	7	8.94365e-07	-7.10	-7.63	0	JPL: Computed at 05:53 today Pacific time based on 61 observations spanning 3.0257 days (2020-Feb-26.21575 to 2020-Feb-29.24145). Diameter approximately 0.015 km. from weighted mean H=26.76.

2020 DF3	NEODyS	2100	2066-2115	16	1.18e-06	-5.24	-5.87	0	NEODyS: "Based on 57 optical observations (of which 1 are rejected as outliers) from 2020-02-24.445 to 2020-02-29.474."
2020 DF3	JPL Sentry	1700	2053-2103	12	2.866517e-06	-4.88	-5.32	0	JPL: Computed at 05:52 today Pacific time based on 57 observations spanning 5.0290 days (2020-Feb-24.44469 to 2020-Feb-29.47365). Diameter approximately 0.050 km. from weighted mean H=24.14.

2020 DR2	JPL Sentry	2233	2074-2114	3	2.244339e-05	-1.48	-1.75	1	JPL: Computed at 13:59 today Pacific time based on 158 observations spanning 8.6564 days (2020-Feb-20.19345 to 2020-Feb-28.849896). Diameter approximately 0.590 km. from weighted mean H=18.80.
2020 DR2	NEODyS	2100	2062-2114	4	1.35e-05	-1.71	-1.95	1	NEODyS: "Based on 165 optical observations (of which 2 are rejected as outliers) from 2020-02-20.194 to 2020-02-28.851."

2020 DO2	JPL Sentry	1700	2071-2113	10	6.875158e-06	-5.97	-6.37	0	JPL: Computed at 05:32 today Pacific time based on 13 observations spanning 5.2471 days (2020-Feb-20.30254 to 2020-Feb-25.549598). Diameter approximately 0.015 km. from weighted mean H=26.82.

2020 DF2	NEODyS	2100	R E M O V E D						-

2020 DW	NEODyS	2100	2108	1	3.4e-08	-10.52	-10.52	0	NEODyS: "Based on 52 optical observations (of which 4 are rejected as outliers) from 2020-02-16.435 to 2020-02-19.219."
2020 DW	JPL Sentry	1700	2108-2108	1	4.743e-06	-8.36	-8.36	0	JPL: Computed at 06:02 today Pacific time based on 51 observations spanning 2.7839 days (2020-Feb-16.43421 to 2020-Feb-19.21811). Diameter approximately 0.003 km. from weighted mean H=30.34.

2020 CF2	NEODyS	2100	2096-2116	10	1.22e-05	-6.63	-6.8	0	NEODyS: "Based on 84 optical observations (of which 2 are rejected as outliers) from 2020-02-13.349 to 2020-02-29.448."
2020 CF2	JPL Sentry	1700	2072-2120	10	7.817662e-06	-6.80	-7.12	0	JPL: Computed at 05:41 today Pacific time based on 83 observations spanning 16.098 days (2020-Feb-13.349028 to 2020-Feb-29.44685). Diameter approximately 0.011 km. from weighted mean H=27.51.

2020 CQ1	NEODyS	2100	2058-2118	57	7.15e-03	-4.21	-4.93	0	NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2020-02-05.356 to 2020-02-27.283."
2020 CQ1	JPL Sentry	1700	2052-2095	14	0.00139216574	-4.89	-4.92	0	JPL: Computed at 05:33 today Pacific time based on 44 observations spanning 21.927 days (2020-Feb-05.3547 to 2020-Feb-27.281772). Diameter approximately 0.006 km. from weighted mean H=28.83.

2020 BH	NEODyS	2100	2104-2117	10	7.07e-06	-7.21	-7.39	0	NEODyS: "Based on 61 optical observations (of which 1 are rejected as outliers) from 2020-01-18.333 to 2020-02-25.587."
2020 BH	JPL Sentry	1700	2104-2120	5	4.5691e-05	-6.37	-6.54	0	JPL: Computed at 05:34 today Pacific time based on 60 observations spanning 38.254 days (2020-Jan-18.33189 to 2020-Feb-25.585792). Diameter approximately 0.008 km. from weighted mean H=28.25.

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 29 February '20

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

2233	Noted that JPL Sentry has updated its 2020 DR2 risk assessment - see above
2100	Noted that NEODyS has updated its 2020 BH risk assessment - see above Noted that NEODyS has updated its 2020 CF2 risk assessment - see above Noted that NEODyS has updated its 2020 CQ1 risk assessment - see above Noted that NEODyS has removed 2020 DF2 as an impact risk - see above Noted that NEODyS has updated its 2020 DF3 risk assessment - see above Noted that NEODyS has posted 2020 DG4 as an impact risk - see above Noted that NEODyS has updated its 2020 DN3 risk assessment - see above Noted that JPL Sentry has posted 2020 DP4 as an impact risk - see above Noted that NEODyS has updated its 2020 DR2 risk assessment - see above Noted that JPL Sentry has posted 2020 DR4 as an impact risk - see above Noted that NEODyS has updated its 2020 DW risk assessment - see above
1916	Grabbed MPEC 2020-D148 - 2020 DQ4 - see above Grabbed MPEC 2020-D149 - 2020 DR4 - see above
1905	Grabbed MPEC 2020-D143 - 2020 DM4 - see above Grabbed MPEC 2020-D144 - 2020 CE3 - see above Grabbed MPEC 2020-D145 - 2020 DN4 - see above Grabbed MPEC 2020-D146 - 2020 DO4 - see above Grabbed MPEC 2020-D147 - 2020 DP4 - see above
1700	Noted that JPL Sentry has updated its 2020 BH risk assessment - see above Noted that JPL Sentry has updated its 2020 CF2 risk assessment - see above Noted that JPL Sentry has updated its 2020 CQ1 risk assessment - see above Noted that JPL Sentry has updated its 2020 DF3 risk assessment - see above Noted that JPL Sentry has updated its 2020 DN3 risk assessment - see above Noted that JPL Sentry has updated its 2020 DO2 risk assessment - see above Noted that JPL Sentry has updated its 2020 DW risk assessment - see above Grabbed MPEC 2020-D137 - Daily Orbit Update - see above Grabbed MPEC 2020-D138 - 2020 DH4 - see above Grabbed MPEC 2020-D139 - 2020 DJ4 - see above Grabbed MPEC 2020-D140 - 2020 DK4 - see above Grabbed MPEC 2020-D141 - 2020 DL4 - see above Grabbed MPEC 2020-D142 - 2019 GD20 - see above
0530	Noted that JPL Sentry has posted 2020 DG4 as an impact risk - see above
0200	Grabbed MPEC 2020-D135 - 2020 DF4 - see above Grabbed MPEC 2020-D136 - 2020 DG4 - see above

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