Contents  on 30 December '20

LAST EDITION:  This today will be the final edition of The Tracking News, ending daily news coverage since September 2007. We will also stop the Consolidated Risk Tables, published since September 2003. This Web site will continue with Earth's Busy Neighborhood and supporting features, including a new ephemerides page and some new graphics we have in preparation to help inform the general public about the discovery and tracking of nearby asteroid traffic.

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.

NEOCP Activity  on 30 December '20

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 32 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 30 December '20

Minor Planet Electronic Circulars

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

<< DOU on 30 December '20 >>  MPEC 2020-Y157 - "12:01 UT" - Daily Orbit Update

MPEC 2020-Y156 - "02:03 UT" - 2020 YB5

MPEC 2020-Y155 - "01:53 UT" - 2020 YA5

Observers  on 30 December '20

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
T05ATLAS Haleakala in Hawaii, 10 in MPECs 2020-Y155 & 2020-Y157 -- 2020 YA5, 2020 WA5, 53435, 465749, 417217, 416694, 313276, 21374, 162186, 159402
T08ATLAS Mauna Loa in Hawaii, 13 in MPEC 2020-Y157 -- 2003 YJ, 85275, 481817, 418849, 36183, 186822, 138095, 4953, 4179, 4055, 3908, 1036, 887
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2020-Y155 & 2020-Y156 -- 2020 YB5, 2020 YA5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 23 in MPEC 2020-Y157 -- 2020 YV, 2020 XU3, 2020 XM5, 2020 XK5, 2020 XK3, 2020 XF6, 2020 XD4, 2020 XD1, 2020 XB7, 2020 XA5, 2020 WZ4, 2020 WW, 2020 WO3, 2020 WE3, 2020 WB5, 2020 VC5, 2020 UL1, 2020 UJ2, 2020 UG2, 2020 TH5, 2020 QZ2, 2020 QK6, 2020 OE4
113Drebach Obs. in Germany, 4 in MPECs 2020-Y155 & 2020-Y157 -- 2020 YA5, 275714, 6053, 4179
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2020-Y156 -- 2020 YB5
J95Great Shefford Obs. in England, 5 in MPECs 2020-Y155, 2020-Y156 & 2020-Y157 -- 2020 YY2, 2020 YB5, 2020 YB4, 2020 YA5, 2020 WS5
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2020-Y155 -- 2020 YA5
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2020-Y157 -- 2020 YJ2
C401program code 1 via Kuban State Univ. Obs. in Russia, 2 in MPEC 2020-Y157 -- 90147, 159402
Z22MASTER IAC Obs. in the Canary Islands, 1 in MPEC 2020-Y157 -- 416694
K74Muensterschwarzach Obs. in Germany, 1 in MPEC 2020-Y155 -- 2020 YA5
Z80Northolt Branch Obs. in England, 4 in MPECs 2020-Y155 & 2020-Y157 -- 2020 YA5, 465749, 438902, 416694
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2020-Y157 -- 2011 QT2, 154330, 152978
F52Pan-STARRS 2 (PS2) in Hawaii, 4 in MPEC 2020-Y157 -- 1999 VX15, 416694, 154330, 152978
L04ROASTERR-1 in Romania, 1 in MPEC 2020-Y155 -- 2020 YA5
C95SATINO-1 in France, 1 in MPEC 2020-Y157 -- 35107
204Schiaparelli Obs. in Italy, 1 in MPEC 2020-Y156 -- 2020 YB5
I52Steward Obs. Mt. Lemmon Station in Arizona, 1 in MPEC 2020-Y156 -- 2020 YB5
T12UH/Tholen NEO Follow-Up 2.24m Telescope in Hawaii, 1 in MPEC 2020-Y157 -- 2015 TC25
L01Visnjan Obs. in Croatia, 1 in MPEC 2020-Y156 -- 2020 YB5
N88Xingming Obs. #3, 1 in MPEC 2020-Y155 -- 2020 YA5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 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.





Notes for Today's Latest Risk Assessments
2020 YB5NEODyS17002049-21211495.2e-05-4.80-5.55n/aNEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2020-12-26.435 to 2020-12-30.021."
JPL Sentry06022061-2120530.0002027163-4.20-5.040JPL: Computed at 19:35 Dec. 29th Pacific time based on 25 observations spanning 3.5858 days (2020-Dec-26.434286 to 2020-Dec-30.020125). Diameter approximately 0.030 km. from weighted mean H=25.25.
2016 AZ193JPL Sentry06022021-21144912.1893227e-06-6.19-7.150JPL: Computed at 14:28 April 6th of 2017 Pacific time based on 9 observations spanning .15930 days (2016-Jan-03.25638 to 2016-Jan-03.41568). Diameter approximately 0.016 km. from weighted mean H=26.62.
2011 YC63JPL Sentry06022034-204844.5030993e-06-6.50-6.510JPL: Computed at 08:08 April 9th of 2017 Pacific time based on 14 observations spanning .93688 days (2011-Dec-31.38732 to 2012-Jan-01.3242). Diameter approximately 0.005 km. from weighted mean H=28.98.
2010 XN69JPL Sentry06022024-21161426.94032716e-05-4.84-6.010JPL: Computed at 21:19 April 6th of 2017 Pacific time based on 15 observations spanning .89999 days (2010-Dec-15.23581 to 2010-Dec-16.1358). Diameter approximately 0.019 km. from weighted mean H=26.31.

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 30 December '20

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

1700Noted that NEODyS has posted 2020 YB5 as an impact risk - see above
Grabbed MPEC 2020-Y157 - Daily Orbit Update - see above
0602Noted that JPL Sentry has updated its 2010 XN69 risk assessment - see above
Noted that JPL Sentry has updated its 2011 YC63 risk assessment - see above
Noted that JPL Sentry has updated its 2016 AZ193 risk assessment - see above
Noted that JPL Sentry has posted 2020 YB5 as an impact risk - see above
Grabbed MPEC 2020-Y155 - 2020 YA5 - see above
Grabbed MPEC 2020-Y156 - 2020 YB5 - see above