2020-12-04 Tracking News

Contents on 4 December '20

IAU Minor Planet Center
- NEOCP Activity -- 23 listings
- New MPECs -- two MPECs
Observers -- nineteen observers
Impact Risk Monitoring -- eight objects
Chronology

Asteroid/Comet Connection (A/CC) Resources:

Consolidated Risk Tables - the CRT page
Of 1226 risk-listed objects, 185 have had news in the last 31 days. Updated at 1703 UTC on 4 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 4 December '20

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 26 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 4 December '20

Minor Planet Electronic Circulars

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

MPEC 2020-X11 time-stamped "02:41 UT" - 2020 WU5 - see below
MPEC 2020-X12 time-stamped "12:12 UT" - Daily Orbit Update

<< DOU on 4 December '20 >> MPEC 2020-X12 - "12:12 UT" - Daily Orbit Update

Observations of risk-listed objects
K20W05G 2020 WG5 (small asteroid, arc=7 days, H=27.7 ~10m, close passer, NHATS target) from the Spacewatch 1.8m telescope (Dec. 4.15-16p2)
K20W04T 2020 WT4 (small asteroid, arc=10 days, H=27.7 ~10m, NHATS target) from Spacewatch 1.8m (Dec. 4.06-08p2 at R=22.1-3)
K20W03Z 2020 WZ3 (small asteroid, arc=11 days, H=26.2 ~19m, NHATS target) from Spacewatch 1.8m (Dec. 4.18-23p3)
Observations of recently (no longer) risk-listed objects
K20W05L 2020 WL5 (arc=6 days, H=21.3 ~186m) from Steward Obs. Mt. Lemmon Station (Dec. 4.07p2)
K20W03B 2020 WB3 (arc=13 days, H=20.3 ~295m) from Steward Mt. Lemmon Sta. (Dec. 4.06-07p3)
K20W00G 2020 WG (arc=18 days, H=21.6 ~162m) from Steward Mt. Lemmon Sta. (Dec. 4.16-17p4)
Observations of close-passing objects
K20W02B 2020 WB2 (Q=4.693 AU, arc=15 days, H=23.4 ~71m) from Steward Mt. Lemmon Sta. (Dec. 4.29-31p4)
K20W01K 2020 WK1 (arc=4 days, H=27.4 ~11m, NHATS target) from Landehen Obs. (Nov. 18.92p2)
K20T12B 2020 TB12 (arc=50 days, H=21.6 ~162m) from the Spacewatch 0.9m telescope (Dec. 4.25-28p3)
Observation campaigns (NHATS targets, radar support)
K20W03K 2020 WK3 (arc=12 days, H=25.1 ~32m, NHATS) from program code "." (23) via Faulkes Telescope North (Dec. 3.28p3) and Steward Mt. Lemmon Sta. (Dec. 4.26p4)
K20W03F 2020 WF3 (arc=13 days, H=23.6 ~65m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 4.26-27p3)
K20W01D 2020 WD1 (arc=18 days, H=23.7 ~62m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 4.25-26p4)
K20W00Y 2020 WY (arc=18 days, H=26.2 ~19m, NHATS) from Spacewatch 1.8m (Dec. 4.26-28p3) and Steward Mt. Lemmon Sta. (Dec. 4.27-28p4)
K20W00O 2020 WO (arc=18 days, H=25.8 ~23m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 4.08p3)
K20V05X 2020 VX5 (arc=21 days, H=23.4 ~71m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 4.20-21p4)
K20U04E 2020 UE4 (arc=45 days, H=23.6 ~65m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 4.12-13p2)
K20T01Z 2020 TZ1 (arc=57 days, H=24.1 ~51m, NHATS) from Steward Mt. Lemmon Sta. (Dec. 4.14-15p3) and Pan-STARRS 1 (PS1) (Dec. 4.29-32p4)
K20S00O 2020 SO (NHATS) from Steward Mt. Lemmon Sta. (Dec. 4.06p4) and the Catalina Sky Survey (CSS) (Dec. 4.15-16p4)
K17C01Q 2017 CQ1 (arc=39 days, H=24.3 ~47m, NHATS) from Spacewatch 1.8m (2017 March 8.10-11p2)
K11G60D 2011 GD60 (arc=4 opp, H=21.8 ~148m, NHATS) from ATLAS Haleakala (Dec. 3.47-49p4)
K06D00X 2006 DX (arc=2 opp, H=23.9 ~56m, NHATS) from Spacewatch 1.8m (2017 March 18.16-18p2 at R=22.9)
-- NHATS target table
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20W04P 2020 WP4 (arc=11 days, H=22.1 ~129m) from Steward Mt. Lemmon Sta. (Dec. 4.32p4)
K20W04E 2020 WE4 (arc=11 days, H=23.4 ~71m) from Steward Mt. Lemmon Sta. (Dec. 4.31-32p4)
K20W03O 2020 WO3 (arc=24 days, H=23.2 ~78m) from Steward Mt. Lemmon Sta. (Dec. 4.23p3)
K20W03E 2020 WE3 (arc=13 days, H=25.4 ~28m) from Steward Mt. Lemmon Sta. (Dec. 4.37p3)
K20W03C 2020 WC3 (arc=13 days, H=22.4 ~112m) from Steward Mt. Lemmon Sta. (Dec. 4.33p3)
K20W02U 2020 WU2 (Q=4.771 AU, arc=14 days, H=22.8 ~93m) from Steward Mt. Lemmon Sta. (Dec. 4.23-24p3)
K20W02F 2020 WF2 (Q=4.250 AU, arc=15 days, H=22.1 ~129m) from Steward Mt. Lemmon Sta. (Dec. 4.16p4)
K20W00V 2020 WV (arc=20 days, H=23.8 ~59m) from Steward Mt. Lemmon Sta. (Dec. 4.21-22p2)
K20V01K 2020 VK1 (arc=26 days, H=24.0 ~54m) from Sandlot Obs. (Dec. 4.06-08p3) and Steward Mt. Lemmon Sta. (Dec. 4.25p2)
K20V00T 2020 VT (arc=30 days, H=25.3 ~29m) from Spacewatch 0.9m (Dec. 4.30-33p3)
K20U02N 2020 UN2 (arc=49 days, H=22.5 ~107m) from Sandlot Obs. (Dec. 4.02-05p4)
K20U00D 2020 UD (arc=57 days, H=23.1 ~81m) from Sandlot Obs. (Dec. 4.17-22p3)
K20T10L 2020 TL10 (arc=51 days, H=22.6 ~102m) from Steward Mt. Lemmon Sta. (Dec. 4.13p4)
K20T07T 2020 TT7 (arc=51 days, H=22.2 ~123m) from Steward Mt. Lemmon Sta. (Dec. 4.38-39p4)
K20T07E 2020 TE7 (arc=51 days, H=23.8 ~59m) from Steward Mt. Lemmon Sta. (Dec. 4.09p3)
K20T03G 2020 TG3 (Q=4.609 AU, arc=58 days, H=22.5 ~107m) from Pan-STARRS 2 (PS2) (Dec. 3.53-55p3)
K20R11Q 2020 RQ11 (arc=81 days, H=22.2 ~123m) from the Mt. Lemmon Survey (MLS) (Dec. 3.19-20p4)
K20Q03P 2020 QP3 (arc=108 days, H=22.7 ~98m) from Steward Mt. Lemmon Sta. (Dec. 4.34-36p3)
K20W02Y 2020 WY2 (arc=14 days, H=21.9 ~141m) from Steward Mt. Lemmon Sta. (Dec. 4.18p2)
K20W02E 2020 WE2 (arc=23 days, H=21.8 ~148m) from Steward Mt. Lemmon Sta. (Dec. 4.14p2)
Observations of other objects
K20W05S 2020 WS5 (i=40.7°, arc=7 days, H=21.0 ~214m) from Steward Mt. Lemmon Sta. (Dec. 4.41p4)
K20W05A 2020 WA5 (arc=9 days, H=21.5 ~170m) from Faulkes North/code "." (23) (Dec. 3.50p3) and Steward Mt. Lemmon Sta. (Dec. 4.32p4)
K20V06Q 2020 VQ6 (arc=19 days, H=21.1 ~204m) from Steward Mt. Lemmon Sta. (Dec. 4.29-31p4)
K20V03N 2020 VN3 (arc=23 days, H=20.2 ~309m) from PS1 (Dec. 3.57-61p3)
K20U03Z 2020 UZ3 (arc=86 days, H=20.4 ~282m) from MLS (Dec. 3.05-07p4) and Steward Mt. Lemmon Sta. (Dec. 4.11-12p2)
K20T05H 2020 TH5 (arc=52 days, H=21.1 ~204m) from Spacewatch 0.9m (Dec. 4.18-21p3)
K20S18K 2020 SK18 (arc=69 days, H=20.4 ~282m) from Steward Mt. Lemmon Sta. (Dec. 4.29-31p4)
K20Q06U 2020 QU6 (arc=98 days, H=18.2 ~776m) from MLS (Dec. 3.15-16p4)
K20Q04M 2020 QM4 (arc=106 days, H=18.6 ~645m) from PS1 (Dec. 3.37-44p6)
K20O08C 2020 OC8 (arc=171 days, H=20.8 ~234m) from ATLAS Haleakala (Dec. 3.41-43p4)
K20M04X 2020 MX4 (arc=2 opp, H=19.9 ~355m) from Steward Mt. Lemmon Sta. (Dec. 4.19-20p3)
K18G05V 2018 GV5 (arc=2 opp, H=20.0 ~339m) from PS1 (Dec. 4.29-31p3)
K17V12T 2017 VT12 (arc=4 opp, H=20.4 ~282m) from ATLAS Mauna Loa (Dec. 3.34-36p4)
K17S19E 2017 SE19 (arc=3 opp, H=19.8 ~371m) from ATLAS Haleakala (Dec. 3.36-38p4)
K17G06O 2017 GO6 (Q=4.121 AU, arc=2 opp, H=19.3 ~467m) from MLS (Dec. 3.17-18p3)
K17B93Q 2017 BQ93 (i=38.7°, arc=3 opp, H=20.3 ~295m) from Spacewatch 1.8m (2017 March 2.10-11p2)
K16J33U 2016 JU33 (arc=3 opp, H=20.8 ~234m) from Sandlot Obs. (Dec. 4.12-14p3)
K13U14X 2013 UX14 (arc=4 opp, H=18.3 ~741m) from ATLAS Mauna Loa (Dec. 3.49-51p4)
K13P06Y 2013 PY6 (arc=4 opp, H=19.3 ~467m) from CSS (Dec. 3.30-31p4) and ATLAS Haleakala (Dec. 3.42-45p4)
K07VD7X 2007 VX137 (arc=5 opp, H=18.5 ~676m) from PS2 (Dec. 3.38-41p3)
K04L03U 2004 LU3 (arc=5 opp, H=18.4 ~708m) from ATLAS Haleakala (Dec. 3.41-44p4)
K04A00C 2004 AC (arc=4 opp, H=18.9 ~562m) from ATLAS Mauna Loa (Dec. 3.60-61p4)
K02G08Z 2002 GZ8 (Q=4.633 AU, arc=4 opp, H=18.7 ~616m) from ATLAS Mauna Loa (Dec. 3.54-60p4)
K00P27Q 2000 PQ27 (arc=3 opp, H=20.0 ~339m) from PS2 (Dec. 3.34-37p3) and PS1 (Dec. 3.37-41p4)
p8640 518640 2008 KZ5 from UH/Tholen NEO Follow-Up 2.24m Telescope (2010 March 24.50p1 at G=23.63)
o3960 503960 2004 QF1 from PS2 (Dec. 4.21-25p7)
m2505 482505 2012 TQ78 from ATLAS Mauna Loa (Dec. 3.51-53p4)
l4554 474554 2003 YQ94 from CSS (Dec. 3.12-14p4) and ATLAS Haleakala (Dec. 3.27-29p4)
j5193 455193 2000 RJ60 from PS1 (Dec. 3.57-60p4)
c0929 380929 2006 HU30 from PS1 (Dec. 3.37-42p5)
c0359 380359 2002 TN30 from ATLAS Mauna Loa (Dec. 3.54-56p4)
P0458 250458 2004 BO41 from PS2 (Dec. 4.21-24p4)
J4126 194126 2001 SG276 from MLS (Dec. 3.27-29p4)
I5716 185716 1998 SF35 from Geyserland Obs. (Dec. 3.56-57p2)
G4207 164207 2004 GU9 from PS1 (Dec. 3.57-59p3)
G3902 163902 2003 SW222 from ATLAS Mauna Loa (Dec. 3.50-53p4)
G3364 163364 2002 OD20 from CSS (Dec. 3.31p1)
G3014 163014 2001 UA5 from ATLAS Haleakala (Dec. 3.27-30p4)
G2173 162173 Ryugu (1999 JU3) from CSS (Dec. 3.15-16p4) and ATLAS Haleakala (Dec. 3.29-31p4)
F9402 159402 1999 AP10 from ATLAS Mauna Loa (Dec. 3.57-59p4) and program code 1 via Kuban State Univ. Obs. (Dec. 3.91-01p102)
F5140 155140 2005 UD from PS1 (Dec. 3.37-44p6)
F4330 154330 2002 VX94 from ATLAS Mauna Loa (Dec. 3.42-44p4)
F3249 153249 2001 BW15 from PS1 (Dec. 3.30-32p3)
F2978 152978 2000 GJ147 from PS2 (Dec. 3.43-45p3)
E4411 144411 2004 EW9 from MLS (Dec. 3.31-33p4)
D8852 138852 2000 WN10 from CSS (Dec. 3.25p1) and ATLAS Haleakala (Dec. 3.34-36p4)
D7032 137032 1998 UO1 from CSS (Dec. 3.11-12p3)
86039 86039 1999 NC43 from ATLAS Haleakala (Dec. 3.21-24p4)
85804 85804 1998 WQ5 from MLS (Dec. 3.10-12p3)
68359 68359 2001 OZ13 from CSS (Dec. 3.27-29p3) and ATLAS Haleakala (Dec. 3.38-40p4)
66272 66272 1999 JW6 from ATLAS Mauna Loa (Dec. 3.46-48p3)
66251 66251 1999 GJ2 from PS1 (Dec. 4.21-23p4)
65717 65717 1993 BX3 from ATLAS Haleakala (Dec. 3.38-40p4) and Geyserland Obs. (Dec. 3.52-54p4)
54401 54401 2000 LM from PS2 (Dec. 4.21-24p4)
36284 36284 2000 DM8 from ATLAS Mauna Loa (Dec. 3.25-27p4)
30825 30825 1990 TG1 from ATLAS Haleakala (Dec. 3.24-26p5)
19764 19764 2000 NF5 from CSS (Dec. 3.19-20p4) and ATLAS Haleakala (Dec. 3.32-34p4)
16834 16834 1997 WU22 from PS2 (Dec. 3.43-46p4)
12538 12538 1998 OH from Geyserland Obs. (Dec. 3.61-62p4)
10115 10115 1992 SK from PS2 (Dec. 3.29-32p3), PS1 (Dec. 3.37-39p3), and ATLAS Mauna Loa (Dec. 3.38-40p4)
09172 9172 Abhramu (1989 OB) from CSS (Dec. 3.10-12p2)
08567 8567 1996 HW1 from ATLAS Haleakala (Dec. 3.53-55p4)
05645 5645 1990 SP from SATINO-1 (Sept. 4.11p2)
05587 5587 1990 SB from ATLAS Haleakala (Dec. 3.44-46p4)
04503 4503 Cleobulus (1989 WM) from ATLAS Haleakala (Dec. 3.34-36p4)
04055 4055 Magellan (1985 DO2) from Geyserland Obs. (Dec. 3.48-51p4)
03908 3908 Nyx (1980 PA) from CSS (Dec. 3.10-12p4) and ATLAS Haleakala (Dec. 3.26-28p3)
02212 2212 Hephaistos (1978 SB) from CSS (Dec. 3.25-27p4)
01981 1981 Midas (1973 EA) from CSS (Dec. 3.06-08p4) and ATLAS Haleakala (Dec. 3.24-26p3)
01943 1943 Anteros (1973 EC) from ATLAS Haleakala (Dec. 3.61-65p4)
01865 1865 Cerberus (1971 UA) from PS1 (Dec. 4.22-23p4)
01685 1685 Toro (1948 OA) from ATLAS Haleakala (Dec. 3.64-66p4)
01580 1580 Betulia (1950 KA) from ATLAS Mauna Loa (Dec. 3.46-48p4)
01036 1036 Ganymed (1924 TD) from ATLAS Haleakala (Dec. 3.56-63p8)

MPEC 2020-X11 - "02:41 UT" - 2020 WU5

K20W05U 2020 WU5 (risk listed, i=42.6°, H=18.9 ~562m) was picked up at 1816 UT on 29 Nov. by NEOWISE, observing it at Nov. 29.76p1, 29.89p1, 30.02p1, 30.22p1, 30.35p1, 30.42p1, 30.55p1, 30.61p1, 30.68p1, 30.74p1, 30.81p1, 30.87p1, Dec. 1.00p1, 1.13p1, 1.20p1, and 1.40p1. This detection was confirmed by Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 1.23-25p4) and LCO Sutherland B (Dec. 3.02-03p4).

Observers on 4 December '20

Nineteen observers appear in today's MPECs.

Code	Observer / observatory
`T05`	ATLAS Haleakala in Hawaii, 22 in MPEC 2020-X12 -- 2020 OC8, 2017 SE19, 2013 PY6, 2011 GD60, 2004 LU3, 86039, 68359, 65717, 474554, 30825, 19764, 163014, 162173, 138852, 8567, 5587, 4503, 3908, 1981, 1943, 1685, 1036
`T08`	ATLAS Mauna Loa in Hawaii, 13 in MPEC 2020-X12 -- 2017 VT12, 2013 UX14, 2004 AC, 2002 GZ8, 66272, 482505, 380359, 36284, 163902, 159402, 154330, 10115, 1580
`703`	Catalina Sky Survey (CSS) in Arizona, 13 in MPEC 2020-X12 -- 2020 SO, 2013 PY6, 68359, 474554, 19764, 163364, 162173, 138852, 137032, 9172, 3908, 2212, 1981
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2020-X11 -- 2020 WU5
`F65.`	program code "." (23) via Faulkes Telescope North in Hawaii, 2 in MPEC 2020-X12 -- 2020 WK3, 2020 WA5
`E89`	Geyserland Obs. in New Zealand, 4 in MPEC 2020-X12 -- 65717, 185716, 12538, 4055
`C401`	program code 1 via Kuban State Univ. Obs. in Russia, 1 in MPEC 2020-X12 -- 159402
`Z43`	Landehen Obs., 1 in MPEC 2020-X12 -- 2020 WK1
`K92`	LCO Sutherland B in South Africa, 1 in MPEC 2020-X11 -- 2020 WU5
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 7 in MPEC 2020-X12 -- 2020 UZ3, 2020 RQ11, 2020 QU6, 2017 GO6, 85804, 194126, 144411
`C51`	NEOWISE in Earth polar orbit, 1 in MPEC 2020-X11 -- 2020 WU5
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 13 in MPEC 2020-X12 -- 2020 VN3, 2020 TZ1, 2020 QM4, 2018 GV5, 2000 PQ27, 66251, 455193, 380929, 164207, 155140, 153249, 10115, 1865
`F52`	Pan-STARRS 2 (PS2) in Hawaii, 9 in MPEC 2020-X12 -- 2020 TG3, 2007 VX137, 2000 PQ27, 54401, 503960, 250458, 16834, 152978, 10115
`H36`	Sandlot Obs. in Kansas, 4 in MPEC 2020-X12 -- 2020 VK1, 2020 UN2, 2020 UD, 2016 JU33
`C95`	SATINO-1 in France, 1 in MPEC 2020-X12 -- 5645
`691`	Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2020-X12 -- 2020 VT, 2020 TH5, 2020 TB12
`291`	Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2020-X12 -- 2020 WZ3, 2020 WY, 2020 WT4, 2020 WG5, 2017 CQ1, 2017 BQ93, 2006 DX
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 34 in MPEC 2020-X12 -- 2020 WY2, 2020 WY, 2020 WV, 2020 WU2, 2020 WS5, 2020 WP4, 2020 WO3, 2020 WO, 2020 WL5, 2020 WK3, 2020 WG, 2020 WF3, 2020 WF2, 2020 WE4, 2020 WE3, 2020 WE2, 2020 WD1, 2020 WC3, 2020 WB3, 2020 WB2, 2020 WA5, 2020 VX5, 2020 VQ6, 2020 VK1, 2020 UZ3, 2020 UE4, 2020 TZ1, 2020 TT7, 2020 TL10, 2020 TE7, 2020 SO, 2020 SK18, 2020 QP3, 2020 MX4
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-X12 -- 518640

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

Impact Risk Monitoring on 4 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 WU5	NEODyS	1701	2040-2119	13	2.02e-07	-3.41	-3.79	0	NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2020-11-29.762 to 2020-12-03.031."
2020 WU5	JPL Sentry	0600	2039-2119	114	5.35392e-07	-3.03	-3.75	0	JPL: Computed at 20:11 Dec. 3rd Pacific time based on 24 observations spanning 3.2685 days (2020-Nov-29.76136 to 2020-Dec-03.029828). Diameter approximately 0.540 km. from weighted mean H=19.00.

2020 WG5	JPL Sentry	1700	2086-2120	11	0.0002152884	-5.29	-5.40	0	JPL: Computed at 06:21 today Pacific time based on 44 observations spanning 6.9116 days (2020-Nov-27.251726 to 2020-Dec-04.16329). Diameter approximately 0.010 km. from weighted mean H=27.67.

2020 WT4	NEODyS	1701	2068-2119	15	8.52e-06	-6.72	-6.91	0	NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2020-11-24.191 to 2020-12-04.084."
2020 WT4	JPL Sentry	1700	2062-2119	9	6.552529e-06	-6.83	-7.07	0	JPL: Computed at 06:29 today Pacific time based on 25 observations spanning 9.8931 days (2020-Nov-24.190527 to 2020-Dec-04.08365). Diameter approximately 0.010 km. from weighted mean H=27.71.

2020 WZ3	NEODyS	1701	2089-2120	18	3.72e-05	-5.42	-5.83	n/a	NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2020-11-23.353 to 2020-12-04.235."
2020 WZ3	JPL Sentry	1700	2088-2119	14	3.4032705e-05	-5.46	-5.94	0	JPL: Computed at 06:20 today Pacific time based on 35 observations spanning 10.881 days (2020-Nov-23.352624 to 2020-Dec-04.23395). Diameter approximately 0.020 km. from weighted mean H=26.20.

2019 LA2	JPL Sentry	0600	2103-2116	5	3.72864e-07	-7.39	-7.54	0	JPL: Computed at 06:38 July 2nd of 2019 Pacific time based on 36 observations spanning 22.215 days (2019-Jun-04.23363 to 2019-Jun-26.448983). Diameter approximately 0.016 km. from weighted mean H=26.64.

2017 WF30	JPL Sentry	0600	2020-2119	967	2.0071548e-06	-6.01	-6.96	0	JPL: Computed at 13:42 Dec. 18th of 2019 Pacific time based on 8 observations spanning .17008 days (2017-Nov-28.27313 to 2017-Nov-28.44321). Diameter approximately 0.018 km. from weighted mean H=26.38.

2015 XP	JPL Sentry	0600	2067-2067	1	4.127e-07	-6.83	-6.83	0	JPL: Computed at 08:09 April 20th of 2019 Pacific time based on 74 observations spanning 27.858 days (2015-Nov-07.24826 to 2015-Dec-05.10672). Diameter approximately 0.024 km. from weighted mean H=25.75.

2010 XQ	JPL Sentry	0600	2021-2116	69	2.06259e-07	-6.62	-7.31	0	JPL: Computed at 20:02 April 8th of 2017 Pacific time based on 15 observations spanning .12618 days (2010-Dec-02.30871 to 2010-Dec-02.43489). Diameter approximately 0.031 km. from weighted mean H=25.17.

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 4 December '20

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

1701	Noted that NEODyS has updated its 2020 WT4 risk assessment - see above Noted that NEODyS has updated its 2020 WZ3 risk assessment - see above
1700	Noted that JPL Sentry has updated its 2020 WG5 risk assessment - see above Noted that JPL Sentry has updated its 2020 WT4 risk assessment - see above Noted that NEODyS has posted 2020 WU5 as an impact risk - see above Noted that JPL Sentry has updated its 2020 WZ3 risk assessment - see above Grabbed MPEC 2020-X12 - Daily Orbit Update - see above
0600	Noted that JPL Sentry has updated its 2010 XQ risk assessment - see above Noted that JPL Sentry has updated its 2015 XP risk assessment - see above Noted that JPL Sentry has updated its 2017 WF30 risk assessment - see above Noted that JPL Sentry has updated its 2019 LA2 risk assessment - see above Noted that JPL Sentry has posted 2020 WU5 as an impact risk - see above Grabbed MPEC 2020-X11 - 2020 WU5 - see above

http://www.HohmannTransfer.com/mn/20/20339_1204.htm
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