2020-12-28 Tracking News

Contents on 28 December '20

IAU Minor Planet Center
- NEOCP Activity -- 33 listings
- New MPECs -- six MPECs
Observers -- eighteen observers
Impact Risk Monitoring -- eight 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 1244 risk-listed objects, 139 have had news in the last 31 days. Updated at 1907 UTC on 28 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 28 December '20

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 41 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 28 December '20

Minor Planet Electronic Circulars

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

MPEC 2020-Y145 time-stamped "12:00 UT" - Daily Orbit Update - see below
MPEC 2020-Y146 time-stamped "13:55 UT" - 2020 YS4 - see below
MPEC 2020-Y147 time-stamped "15:04 UT" - 2020 YT4 - see below
MPEC 2020-Y148 time-stamped "15:38 UT" - 2020 YU4 - see below
MPEC 2020-Y149 time-stamped "17:11 UT" - 2020 YV4 - see below
MPEC 2020-Y150 time-stamped "17:14 UT" - 2020 YW4

MPEC 2020-Y150 - "17:14 UT" - 2020 YW4

K20Y04W 2020 YW4 (H=20.24 ~303m) was picked up at 1427 UT on 25 Dec. by Pan-STARRS 1 (PS1), observing it at Dec. 25.60-64p4. This detection was confirmed by Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) (Dec. 26.27-28p3 & 28.32-33p3) and the Spacewatch 1.8m telescope (Dec. 26.46-47p2).

MPEC 2020-Y149 - "17:11 UT" - 2020 YV4

K20Y04V 2020 YV4 (small asteroid, H=24.37 ~45m) was picked up at 1425 UT on 25 Dec. by PS1, observing it at Dec. 25.60-64p4 at w=21.56-22.03. This detection was confirmed by Holmes/CTIO (Dec. 26.23-25p3 & 28.29-31p3) and Spacewatch 1.8m (Dec. 26.39-40p3).

MPEC 2020-Y148 - "15:38 UT" - 2020 YU4

K20Y04U 2020 YU4 (small asteroid, H=23.7 ~62m) was picked up at 1418 UT on 24 Dec. by PS1, observing it at Dec. 24.60-63p4 at w=22.15-43. This detection was confirmed by Holmes/CTIO (Dec. 25.23-24p3 at G=21.7-8, 26.20-22p3 at G=22.4-7 & 28.24-26p3 at G=21.5-7) and Spacewatch 1.8m (Dec. 26.52-53p3).

MPEC 2020-Y147 - "15:04 UT" - 2020 YT4

K20Y04T 2020 YT4 (small asteroid, Q=4.162 AU, Earth MOID=3.3 LD, H=24.34 ~46m) was picked up at 1324 UT on 25 Dec. by PS1, observing it at Dec. 23.42-47p3, 23.55-58p2, and 25.56-59p3. This detection was confirmed by Great Shefford Obs. (Dec. 26.06-08p2), Schiaparelli Obs. (Dec. 26.12-13p2), the Mt. Lemmon Survey (MLS) (Dec. 27.25-26p4), and Visnjan Obs. (Dec. 27.78-79p2).

MPEC 2020-Y146 - "13:55 UT" - 2020 YS4

K20Y04S 2020 YS4 (Earth MOID=0.2 LD, H=27.72 ~10m) was picked up at 0329 UT on 27 Dec. by MLS, observing it at Dec. 27.15-16p4. This detection was confirmed by Steward Obs. Mt. Lemmon Station (Dec. 27.23-24p4 & 28.06p4), Farra d'Isonzo Obs. (Dec. 27.69-70p5), Visnjan Obs. (Dec. 27.69-72p8 & 27.80-81p4), Great Shefford Obs. (Dec. 27.81p2), Northolt Branch Obs. (Dec. 27.82-83p3), and Clixby Obs. (Dec. 27.93p2).

<< DOU on 28 December '20 >> MPEC 2020-Y145 - "12:00 UT" - Daily Orbit Update

Observations of risk-listed objects
K11C50L 2011 CL50 (small asteroid, arc=2 opp, H=27.3 ~12m, close passer, NHATS target) from Steward Mt. Lemmon Sta. (Dec. 27.32p3)
Observations of close-passing objects
K20Y04A 2020 YA4 (arc=4 days, H=26.5 ~17m, NHATS target) from MLS (Dec. 27.44-45p3)
K20O05K 2020 OK5 (arc=167 days, H=25.4 ~28m, NHATS target) from MLS (Dec. 27.23-24p4)
Observation campaigns (NHATS targets, radar support)
f8849 418849 2008 WM64 (radar) from the Catalina Sky Survey (CSS) (Dec. 27.15-16p3)
-- NHATS target table -- Planetary radar schedules: Arecibo & Goldstone
Observations of small (H>22.0) & smallish (21.7<H<=22.0) asteroids
K20Y04K 2020 YK4 (arc=6 days, H=24.9 ~35m) from Steward Mt. Lemmon Sta. (Dec. 28.20-21p2)
K20Y04B 2020 YB4 (arc=4 days, H=24.9 ~35m) from MLS (Dec. 27.25-26p3)
K20Y01Q 2020 YQ1 (arc=8 days, H=23.2 ~78m) from MLS (Dec. 27.23-24p4)
K20X02P 2020 XP2 (arc=20 days, H=22.1 ~129m) from CSS (Dec. 27.40-42p2) and Steward Mt. Lemmon Sta. (Dec. 27.50-51p2)
K20V07C 2020 VC7 (arc=52 days, H=24.2 ~49m) from PS1 (Dec. 27.39-43p3)
K12XD3E 2012 XE133 (arc=2 opp, H=23.3 ~74m) from Sabadell Obs. (Dec. 26.93p2)
K09W11D 2009 WD11 (arc=2 opp, H=22.0 ~135m) from MLS (Dec. 27.10-12p3)
Observations of other objects
K20Y03Q 2020 YQ3 (arc=5 days, H=20.2 ~309m) from CSS (Dec. 27.47-48p3) and Steward Mt. Lemmon Sta. (Dec. 27.51p3)
K20W05V 2020 WV5 (arc=36 days, H=20.2 ~309m) from Steward Mt. Lemmon Sta. (Dec. 28.18p1)
K20W05M 2020 WM5 (Q=4.829 AU, arc=29 days, H=20.3 ~295m) from PS1 (Dec. 27.40-43p3)
K20W05A 2020 WA5 (arc=32 days, H=21.5 ~170m) from Steward Mt. Lemmon Sta. (Dec. 27.55p3)
K20W03M 2020 WM3 (i=40.4°, arc=37 days, H=18.5 ~676m) from MLS (Dec. 27.46-47p4)
K20W03L 2020 WL3 (i=63.7°, Q=4.398 AU, arc=37 days, H=18.8 ~589m) from MLS (Dec. 27.48-49p4) and Steward Mt. Lemmon Sta. (Dec. 27.48-50p3)
K20W02H 2020 WH2 (Q=4.564 AU, arc=39 days, H=20.0 ~339m) from Steward Mt. Lemmon Sta. (Dec. 27.51p2)
K20V03M 2020 VM3 (arc=47 days, H=20.7 ~245m) from MLS (Dec. 27.21-22p4)
K20R00U 2020 RU (Q=4.833 AU, arc=120 days, H=19.2 ~490m) from Steward Mt. Lemmon Sta. (Dec. 28.20p3)
K20P05C 2020 PC5 (Q=4.177 AU, arc=136 days, H=18.5 ~676m) from Steward Mt. Lemmon Sta. (Dec. 28.17p2)
K19B01O 2019 BO1 (arc=3 opp, H=19.6 ~407m) from PS1 (Dec. 27.39-43p3) and Steward Mt. Lemmon Sta. (Dec. 27.51-53p3)
K17X62L 2017 XL62 (arc=2 opp, H=18.8 ~589m) from MLS (Dec. 27.13-14p4)
K17B93Q 2017 BQ93 (i=38.7°, arc=3 opp, H=20.3 ~295m) from Steward Mt. Lemmon Sta. (Dec. 28.17-18p2)
K17A19Q 2017 AQ19 (arc=173 days, H=20.7 ~245m) from UH/Tholen NEO Follow-Up 2.24m Telescope (2017 March 30.63-64p2)
K03Y01M 2003 YM1 (arc=3 opp, H=18.1 ~812m) from CSS (Dec. 27.28-29p3)
K02G08Z 2002 GZ8 (Q=4.633 AU, arc=4 opp, H=18.8 ~589m) from CSS (Dec. 27.42-44p4)
K01Y03V 2001 YV3 (arc=3 opp, H=20.6 ~257m) from CSS (Dec. 27.23-24p4)
o8774 508774 1999 JE1 from MLS (Dec. 27.54-55p4)
o8767 508767 1993 BD2 from MLS (Dec. 27.39-41p4) and CSS (Dec. 27.40-42p3)
m6001 486001 2012 MR7 from MLS (Dec. 27.15-17p3)
m3547 483547 2003 WM25 from MLS (Dec. 27.25-26p4)
f8900 418900 2009 BE2 from MLS (Dec. 27.43-45p4 at G=21.38-22.10)
f7217 417217 2005 YS from CSS (Dec. 27.22p1)
f6694 416694 2004 YR32 from MLS (Dec. 27.35-37p4)
b6848 376848 2001 RY47 from MLS (Dec. 27.13-14p4)
a1754 361754 2007 YV29 from MLS (Dec. 27.50-52p4 at G=21.45-22.09)
V3276 313276 2002 AX1 from MLS (Dec. 27.41-43p4)
U7493 307493 2002 XP90 from MLS (Dec. 27.48-49p4)
L6707 216707 2004 XP164 from ATLAS Haleakala (Dec. 27.55-56p4)
H4881 174881 2004 BU58 from MLS (Dec. 27.44-45p4)
H1819 171819 2001 FZ6 from MLS (Dec. 27.35-37p4)
G2186 162186 1999 OP3 from MLS (Dec. 27.31-32p4)
F4658 154658 2004 FA18 from MLS (Dec. 27.48-49p4)
F4555 154555 2003 HA from MLS (Dec. 27.52-54p4)
F4330 154330 2002 VX94 from PS1 (Dec. 28.23-26p4)
F2941 152941 2000 FM10 from CSS (Dec. 27.43-44p4)
E1079 141079 2001 XS30 from ATLAS Haleakala (Dec. 27.53-55p4)
D8095 138095 2000 DK79 from CSS (Dec. 27.10-12p4)
D7805 137805 1999 YK5 from CSS (Dec. 27.08-10p4)
D7099 137099 1998 YW3 from MLS (Dec. 27.27-28p4) and PS1 (Dec. 27.44-48p3)
99935 99935 2002 AV4 from MLS (Dec. 27.33-34p4)
89355 89355 2001 VS78 from CSS (Dec. 27.25-27p4)
35396 35396 1997 XF11 from NEAT's Mt. Palomar telescope (2002 Feb. 25.37-39p3, 2002 March 6.47-48p2 & 2002 June 2.17-19p3) and NEAT's USAF Haleakala telescope (2002 Nov. 2.24-26p3 & 2002 Nov. 3.34-36p3)
32906 32906 1994 RH from SATINO-1 (2019 March 6.02p2)
23183 23183 2000 OY21 from CSS (Dec. 27.43-45p4)
21088 21088 Chelyabinsk (1992 BL2) from CSS (Dec. 27.30-31p4)
10150 10150 1994 PN from CSS (Dec. 27.25-27p4)
08567 8567 1996 HW1 from CSS (Dec. 27.30-31p4) and ATLAS Haleakala (Dec. 27.50-51p4)
06053 6053 1993 BW3 from CSS (Dec. 27.09-10p4)
05131 5131 1990 BG from CSS (Dec. 27.45-47p4)
01981 1981 Midas (1973 EA) from CSS (Dec. 27.06-08p3)
01865 1865 Cerberus (1971 UA) from MLS (Dec. 27.06-07p4)
01036 1036 Ganymed (1924 TD) from ATLAS Haleakala (Dec. 27.52-54p4)

Observers on 28 December '20

Eighteen observers appear in today's MPECs.

Code	Observer / observatory
`T05`	ATLAS Haleakala in Hawaii, 4 in MPEC 2020-Y145 -- 216707, 141079, 8567, 1036
`703`	Catalina Sky Survey (CSS) in Arizona, 19 in MPEC 2020-Y145 -- 2020 YQ3, 2020 XP2, 2003 YM1, 2002 GZ8, 2001 YV3, 89355, 508767, 418849, 417217, 23183, 21088, 152941, 138095, 137805, 10150, 8567, 6053, 5131, 1981
`807\|`	Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2020-Y148, 2020-Y149 & 2020-Y150 -- 2020 YW4, 2020 YV4, 2020 YU4
`Z99`	Clixby Obs. in England, 1 in MPEC 2020-Y146 -- 2020 YS4
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2020-Y146 -- 2020 YS4
`J95`	Great Shefford Obs. in England, 2 in MPECs 2020-Y146 & 2020-Y147 -- 2020 YT4, 2020 YS4
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 29 in MPECs 2020-Y145, 2020-Y146 & 2020-Y147 -- 2020 YT4, 2020 YS4, 2020 YQ1, 2020 YB4, 2020 YA4, 2020 WM3, 2020 WL3, 2020 VM3, 2020 OK5, 2017 XL62, 2009 WD11, 99935, 508774, 508767, 486001, 483547, 418900, 416694, 376848, 361754, 313276, 307493, 174881, 171819, 162186, 154658, 154555, 137099, 1865
`644`	NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2020-Y145 -- 35396
`608`	NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2020-Y145 -- 35396
`Z80`	Northolt Branch Obs. in England, 1 in MPEC 2020-Y146 -- 2020 YS4
`F51`	Pan-STARRS 1 (PS1) in Hawaii, 9 in MPECs 2020-Y145, 2020-Y147, 2020-Y148, 2020-Y149 & 2020-Y150 -- 2020 YW4, 2020 YV4, 2020 YU4, 2020 YT4, 2020 WM5, 2020 VC7, 2019 BO1, 154330, 137099
`619`	Sabadell Obs. in Spain, 1 in MPEC 2020-Y145 -- 2012 XE133
`C95`	SATINO-1 in France, 1 in MPEC 2020-Y145 -- 32906
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2020-Y147 -- 2020 YT4
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2020-Y148, 2020-Y149 & 2020-Y150 -- 2020 YW4, 2020 YV4, 2020 YU4
`I52`	Steward Obs. Mt. Lemmon Station in Arizona, 13 in MPECs 2020-Y145 & 2020-Y146 -- 2020 YS4, 2020 YQ3, 2020 YK4, 2020 XP2, 2020 WV5, 2020 WL3, 2020 WH2, 2020 WA5, 2020 RU, 2020 PC5, 2019 BO1, 2017 BQ93, 2011 CL50
`T12`	UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-Y145 -- 2017 AQ19
`L01`	Visnjan Obs. in Croatia, 2 in MPECs 2020-Y146 & 2020-Y147 -- 2020 YT4, 2020 YS4

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

Impact Risk Monitoring on 28 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 YN4	NEODyS	1900	2060-2120	224	1.21e-04	-5.24	-6.22	n/a	NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2020-12-24.436 to 2020-12-27.074."

2020 YC3	NEODyS	1900	2096-2106	2	1.77e-10	-7.27	-7.41	0	NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2020-12-21.273 to 2020-12-27.273."

2020 YA3	NEODyS	1900	2049-2120	23	1.75e-05	-5.27	-5.35	n/a	NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2020-12-21.357 to 2020-12-27.339."

2020 YL1	NEODyS	1900	2038-2116	2	3.86e-09	-5.36	-5.36	0	NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2020-12-19.376 to 2020-12-27.265."

2020 YA1	NEODyS	1900	2103-2110	6	5.43e-06	-6.60	-6.99	0	NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2020-12-17.405 to 2020-12-27.452."

2020 XF	NEODyS	1900	2056-2120	540	1.4e-03	-3.86	-3.95	n/a	NEODyS: "Based on 100 optical observations (of which 3 are rejected as outliers) from 2020-12-04.328 to 2020-12-27.135."

2011 YC40	JPL Sentry	1900	2028-2050	7	5.69068e-06	-6.79	-6.84	0	JPL: Computed at 08:54 April 10th of 2017 Pacific time based on 13 observations spanning 1.0493 days (2011-Dec-29.27153 to 2011-Dec-30.32086). Diameter approximately 0.004 km. from weighted mean H=29.67.

2011 CL50	NEODyS	1900	2112	1	8.65e-11	-11.80	-11.8	0	NEODyS: "Based on 31 optical observations (of which 1 are rejected as outliers) from 2011-02-12.463 to 2020-12-27.326."

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 28 December '20

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

1900	Noted that NEODyS has updated its 2011 CL50 risk assessment - see above Noted that JPL Sentry has updated its 2011 YC40 risk assessment - see above 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 Noted that NEODyS has posted 2020 YN4 as an impact risk - see above
1800	Grabbed MPEC 2020-Y149 - 2020 YV4 - see above Grabbed MPEC 2020-Y150 - 2020 YW4 - see above
1700	Grabbed MPEC 2020-Y145 - Daily Orbit Update - see above Grabbed MPEC 2020-Y146 - 2020 YS4 - see above Grabbed MPEC 2020-Y147 - 2020 YT4 - see above Grabbed MPEC 2020-Y148 - 2020 YU4 - see above

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