Contents  on 28 November '20

Asteroid/Comet Connection (A/CC) Resources:

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

Radar Astrometry  on 28 November '20

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2202 UTC when the database was dated 28 Nov.



Photometry and some astrometry is needed for upcoming radar targets. See Arecibo and Goldstone schedules.

NEOCP Activity  on 28 November '20

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 30 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 November '20

Minor Planet Electronic Circulars

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


MPEC 2020-W184 - "15:05 UT" - 2020 WG5


MPEC 2020-W183 - "15:04 UT" - 2020 WF5


MPEC 2020-W182 - "15:02 UT" - 2020 WE5


MPEC 2020-W181 - "15:01 UT" - 2020 WD5


<< DOU on 28 November '20 >>  MPEC 2020-W180 - "12:10 UT" - Daily Orbit Update

Observers  on 28 November '20

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

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 11 in MPECs 2020-W180 & 2020-W184 -- 2020 WG5, 2018 GX4, 2017 WJ16, 2013 UX14, 2002 GZ8, 474179, 428086, 415029, 36284, 163902, 154330
T08ATLAS Mauna Loa in Hawaii, 16 in MPECs 2020-W180 & 2020-W184 -- 2020 WG5, 2020 TG3, 2020 ST1, 1999 VX15, 99907, 90075, 89355, 513125, 435404, 241596, 163014, 162173, 12538, 3691, 1036, 887
069Baldone Obs. in Latvia, 2 in MPEC 2020-W180 -- 2020 OK7, 23187
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2020-W180, 2020-W183 & 2020-W184 -- 2020 WG5, 2020 WF5, 2020 QA7, 89355, 465749, 30825, 162173, 162039, 10150, 9172, 5836, 3908, 1981
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2020-W180 & 2020-W181 -- 2020 WD5, 2020 VO, 2020 UC5, 2020 SO
113Drebach Obs. in Germany, 2 in MPECs 2020-W183 & 2020-W184 -- 2020 WG5, 2020 WF5
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2020-W182, 2020-W183 & 2020-W184 -- 2020 WG5, 2020 WF5, 2020 WE5
203GiaGa Obs. in Italy, 1 in MPEC 2020-W182 -- 2020 WE5
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 153201
240Herrenberg Obs. in Germany, 2 in MPEC 2020-W180 -- 242216, 154330
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2020-W180 -- 3122
C401program code 1 via Kuban State Univ. Obs. in Russia, 1 in MPEC 2020-W180 -- 159402
K38M57 Obs. in Italy, 1 in MPEC 2020-W182 -- 2020 WE5
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2020-W180 -- 2018 GX4, 2002 TS67, 2002 GZ8
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPECs 2020-W180, 2020-W181 & 2020-W182 -- 2020 WQ, 2020 WE5, 2020 WD5, 2020 RR2, 2018 ST13, 2015 LK21, 2011 GD60, 2010 VA12, 2000 CN33, 163081, 163014, 162142, 142464, 136773, 887
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2020-W183 -- 2020 WF5
C51NEOWISE in Earth polar orbit, 8 in MPEC 2020-W180 -- 2015 AY245, 2011 CN2, 2009 KK8, 2003 BK47, 90147, 87684, 248590, 4953
Z80Northolt Branch Obs. in England, 4 in MPEC 2020-W180 -- 2020 TG4, 2017 VT12, 2013 UX14, 428086
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPEC 2020-W180 -- 2020 WP4, 2020 TQ7, 2020 RU, 2015 TM237, 21374
F52Pan-STARRS 2 (PS2) in Hawaii, 4 in MPEC 2020-W180 -- 2009 ST19, 438902, 415029, 380128
H36Sandlot Obs. in Kansas, 3 in MPECs 2020-W182, 2020-W183 & 2020-W184 -- 2020 WG5, 2020 WF5, 2020 WE5
C95SATINO-1 in France, 1 in MPEC 2020-W180 -- 4450
204Schiaparelli Obs. in Italy, 1 in MPEC 2020-W182 -- 2020 WE5
W88*program code "*" (19) via Slooh.com Chile Obs. in Chile, 1 in MPEC 2020-W180 -- 186822
I52Steward Obs. Mt. Lemmon Station in Arizona, 23 in MPECs 2020-W180, 2020-W181, 2020-W182, 2020-W183 & 2020-W184 -- 2020 WZ2, 2020 WZ1, 2020 WW3, 2020 WS2, 2020 WR3, 2020 WQ1, 2020 WN4, 2020 WJ4, 2020 WH1, 2020 WG5, 2020 WG, 2020 WF5, 2020 WF1, 2020 WE5, 2020 WE4, 2020 WE2, 2020 WD5, 2020 WC2, 2020 WB3, 2020 VT5, 2020 TL10, 2020 TH5, 2020 OW3
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 2 in MPEC 2020-W180 -- 2018 RP, 2015 UT52
L01Visnjan Obs. in Croatia, 2 in MPECs 2020-W182 & 2020-W184 -- 2020 WG5, 2020 WE5
718Wiggins Obs. in Utah, 1 in MPEC 2020-W184 -- 2020 WG5
I41Zwicky Transient Facility (ZTF) in southern California, 2 in MPEC 2020-W180 -- 2020 WH1, 380359
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 November '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 WG5JPL Sentry17002086-2120120.000224656901-5.26-5.390JPL: Computed at 08:37 today Pacific time based on 42 observations spanning 1.0524 days (2020-Nov-27.251726 to 2020-Nov-28.30411). Diameter approximately 0.010 km. from weighted mean H=27.64.
2020 WF5JPL Sentry17002082-2118241.87228285e-05-6.29-6.860JPL: Computed at 08:34 today Pacific time based on 30 observations spanning 1.1232 days (2020-Nov-27.231322 to 2020-Nov-28.35453). Diameter approximately 0.010 km. from weighted mean H=27.72.
2020 WB3NEODyS2030209714.28e-11-8.23-8.230NEODyS: "Based on 64 optical observations (of which 2 are rejected as outliers) from 2020-11-21.062 to 2020-11-28.064."
JPL Sentry1700R E M O V E DJPL: Risk listing removed at 1412 UTC today
2017 WF30JPL Sentry17002020-21199682.0079331e-06-6.01-6.960JPL: 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.
2016 WR55JPL Sentry17002100-2115132.531688e-06-7.40-7.720JPL: Computed at 18:50 April 12th of 2017 Pacific time based on 16 observations spanning .56895 days (2016-Nov-25.35937 to 2016-Nov-25.928324). Diameter approximately 0.007 km. from weighted mean H=28.34.
2011 SL189JPL Sentry17002043-210058.634e-10-8.80-9.320JPL: Computed at 20:50 April 22nd of 2017 Pacific time based on 11 observations spanning .91578 days (2011-Sep-29.31662 to 2011-Sep-30.2324). Diameter approximately 0.040 km. from weighted mean H=24.63.
2010 UJJPL Sentry17002022-21091111.14103115e-05-5.17-5.470JPL: Computed at 23:20 April 6th of 2017 Pacific time based on 11 observations spanning 1.0144 days (2010-Oct-17.45081 to 2010-Oct-18.46516). Diameter approximately 0.019 km. from weighted mean H=26.26.
2007 YMJPL Sentry17002020-21152474.3315282e-06-5.70-6.490JPL: Computed at 20:16 April 8th of 2017 Pacific time based on 12 observations spanning .12805 days (2007-Dec-17.39661 to 2007-Dec-17.52466). Diameter approximately 0.018 km. from weighted mean H=26.34.

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 November '20

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

2202Noted Radar Astrometry database update - see above
2030Noted that NEODyS has updated its 2020 WB3 risk assessment - see above
1700Noted that JPL Sentry has updated its 2007 YM risk assessment - see above
Noted that JPL Sentry has updated its 2010 UJ risk assessment - see above
Noted that JPL Sentry has updated its 2011 SL189 risk assessment - see above
Noted that JPL Sentry has updated its 2016 WR55 risk assessment - see above
Noted that JPL Sentry has updated its 2017 WF30 risk assessment - see above
Noted that JPL Sentry has removed 2020 WB3 as an impact risk - see above
Noted that JPL Sentry has posted 2020 WF5 as an impact risk - see above
Noted that JPL Sentry has posted 2020 WG5 as an impact risk - see above
Grabbed MPEC 2020-W180 - Daily Orbit Update - see above
Grabbed MPEC 2020-W181 - 2020 WD5 - see above
Grabbed MPEC 2020-W182 - 2020 WE5 - see above
Grabbed MPEC 2020-W183 - 2020 WF5 - see above
Grabbed MPEC 2020-W184 - 2020 WG5 - see above