Contents  on 7 January '10


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

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. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

Radar Astrometry  on 7 January '10

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 0302 UTC when the database was dated 6 Jan.

NEOCP Activity  on 7 January '10

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and five updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of thirteen listings on the NEOCP at some point today.

New MPECs  on 7 January '10

Minor Planet Electronic Circulars

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

MPEC 2010-A32 - "23:29 UT" - Comet P/2010 A2 (LINEAR)

MPEC 2010-A31 - "22:52 UT" - Comet C/2010 A1 (Hill)

MPEC 2010-A30 - "20:58 UT" - 2010 AR1

MPEC 2010-A29 - "17:33 UT" - 2010 AL

MPEC 2010-A28 - "17:29 UT" - 2010 AK

MPEC 2010-A27 - "17:20 UT" - 2010 AJ

MPEC 2010-A26 - "17:16 UT" - 2010 AH

MPEC 2010-A25 - "16:01 UT" - 2009 BE77

<< DOU on 7 Jan. '10 >>  MPEC 2010-A24 - "07:11 UT" - Daily Orbit Update

Observers  on 7 January '10

Nineteen observing facilities appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2010-A32 -- P/2010 A2
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 16 in MPECs 2010-A24, 2010-A27 & 2010-A28 -- 2010 AK, 2010 AJ, 2009 XZ6, 2009 XV, 2009 XT6, 2009 XR2, 2009 XO, 2009 XD, 2009 WZ104, 2009 WR6, 2009 TF10, 2009 TB8, 2009 OP9, 2006 BA148, 2002 AT15, 1995 SA
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2010-A24, 2010-A30 & 2010-A31 -- 2010 AR1, C/2010 A1, 2009 XB2, 2009 WE253, 2002 YN2, 99248, 162998, 154300, 153201, 5131, 3553
448Desert Moon Obs. in New Mexico, 4 in MPEC 2010-A24 -- 2009 WO6, 2009 TM10, 103067, 9950
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 2004 XP14
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2004 XP14
J95Great Shefford Obs. in England, 6 in MPECs 2010-A26, 2010-A27, 2010-A28, 2010-A29, 2010-A31 & 2010-A32 -- 2010 AL, 2010 AK, 2010 AJ, 2010 AH, P/2010 A2, C/2010 A1
704LINEAR in New Mexico, 16 in MPECs 2010-A24, 2010-A26 & 2010-A32 -- 2010 AH, 2010 AF, P/2010 A2, 2009 XB2, 2006 KZ37, 2005 XD1, 2005 TY51, 2004 XD50, 2002 NP1, 86326, 228587, 22753, 226554, 152931, 10165, 5131
8094Eric Elst via La Silla in Chile, 1 in MPEC 2010-A24 -- 2006 MF10
H12LightBuckets Obs. Mayhill in New Mexico, 1 in MPEC 2010-A24 -- 25143
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2010-A26, 2010-A27, 2010-A28, 2010-A29, 2010-A30, 2010-A31 & 2010-A32 -- 2010 AR1, 2010 AL, 2010 AK, 2010 AJ, 2010 AH, P/2010 A2, C/2010 A1
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-A25 -- 2009 BE77
932McCarthy Obs. in Connecticut, 2 in MPECs 2010-A26 & 2010-A27 -- 2010 AJ, 2010 AH
900Moriyama Obs. in Japan, 1 in MPEC 2010-A31 -- C/2010 A1
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2010-A24, 2010-A31 & 2010-A32 -- P/2010 A2, C/2010 A1, 2005 XW77, 17274, 154330, 154300, 4055
H06RAS Obs. Mayhill in New Mexico, 2 in MPECs 2010-A31 & 2010-A32 -- P/2010 A2, C/2010 A1
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2010-A30 -- 2010 AR1
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2010-A24, 2010-A27 & 2010-A29 -- 2010 AL, 2010 AJ, 2002 XA40, 2002 NX, 2000 OG8, 1997 YM3, 228587
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2010-A24, 2010-A27, 2010-A28, 2010-A29 & 2010-A30 -- 2010 AR1, 2010 AL, 2010 AK, 2010 AJ, 2010 AE, 2004 ST9, 2003 CR1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 January '10

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL 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 is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2010 AR1JPL Sentry23582011-21081992.2e-05-5.11-5.860JPL: "Analysis based on 14 observations spanning .37542 days (2010-Jan-07.27712 to 2010-Jan-07.65254)." Diameter approximately 0.023 km. from mean, weighted H=25.9.
2010 AKJPL Sentry19412014-21061301.7e-07-3.73-4.300JPL: "Analysis based on 21 observations spanning .96291 days (2010-Jan-06.31146 to 2010-Jan-07.27437)." Diameter approximately 0.457 km. from mean, weighted H=19.4.
2010 AJJPL Sentry19412041-210954.3e-08-5.14-5.450JPL: "Analysis based on 22 observations spanning 1.0160 days (2010-Jan-06.28873 to 2010-Jan-07.30472)." Diameter approximately 0.341 km. from mean, weighted H=20.0.
2009 XOJPL Sentry1526203811.1e-07-4.46-4.460JPL: "Analysis based on 154 observations spanning 28.338 days (2009-Dec-09.152 to 2010-Jan-06.490002)." Diameter approximately 0.290 km. from mean, weighted H=20.3.
NEODyS15262038-208831.86e-07-4.35-4.460NEODyS: "Based on 154 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2010/01/06.491."

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

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 7 January '10

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

2358Noted that JPL Sentry has posted 2010 AR1 as an impact risk - see above
Grabbed MPEC 2010-A32 - Comet P/2010 A2 (LINEAR) - see above
2305Grabbed MPEC 2010-A31 - Comet C/2010 A1 (Hill) - see above
2201Grabbed MPEC 2010-A30 - 2010 AR1 - see above
1941Noted that JPL Sentry has posted 2010 AJ as an impact risk - see above
Noted that JPL Sentry has posted 2010 AK as an impact risk - see above
Grabbed MPEC 2010-A25 - 2009 BE77 - see above
Grabbed MPEC 2010-A26 - 2010 AH - see above
Grabbed MPEC 2010-A27 - 2010 AJ - see above
Grabbed MPEC 2010-A28 - 2010 AK - see above
Grabbed MPEC 2010-A29 - 2010 AL - see above
1526Noted that JPL Sentry has updated its 2009 XO risk assessment - see above
Noted that NEODyS has updated its 2009 XO risk assessment - see above
Grabbed MPEC 2010-A24 - Daily Orbit Update - see above
0302Noted Radar Astrometry database update - see above