Contents  on 13 January '08


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 this year 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.

NEOCP Activity  on 13 January '08

The MPC's NEO Confirmation Page has 18 listings: 7 new, 11 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had seven new and eleven updated listings. Of these, twelve were "one nighters." So far The Tracking News has counted a total of nineteen objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 13 January '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 13 Jan. '08 >>  MPEC 2008-A60 - "07:07 UT" - Daily Orbit Update

MPEC 2008-A59 - "02:47 UT" - 2008 AF3

Observers  on 13 January '08

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 5 in MPEC 2008-A60 -- 2008 AE, 2007 YZ58, 2007 YN56, 2007 TZ18, 137078
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2008-A60 -- 154347, 4450
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2008-A60 -- 68267
703Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2008-A60 -- 2008 AF3, 2008 AE, 2003 BT35, 2000 CH59, 1685
448Desert Moon Obs. in New Mexico, 9 in MPEC 2008-A60 -- 2008 AX1, 2008 AG1, 2008 AE, 2007 YB2, 2007 XQ3, 2007 XJ20, 2007 RT147, 2006 YF13, 162510
639Dresden Obs. in Germany, 1 in MPEC 2008-A59 -- 2008 AF3
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2008-A60 -- 68359
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-A60 -- 2007 YK
B34Green Island Obs. in Cyprus, 2 in MPEC 2008-A60 -- 2007 PU11, 1993 TQ2
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2008-A60 -- 2007 YZ, 2007 VQ4, 2005 WJ56
J37Huelva Obs. in Spain, 2 in MPEC 2008-A60 -- 2005 WJ56, 1685
G92Jarnac Obs. in Arizona, 1 in MPEC 2008-A60 -- 2003 AZ2
704LINEAR in New Mexico, 13 in MPEC 2008-A60 -- 2008 AE, 2003 XL, 2003 BH84, 2003 AD1, 2000 CH59, 85628, 39565, 163902, 144922, 137084, 11398, 7977, 1620
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPEC 2008-A60 -- 2007 YM56, 2007 TG15, 2006 KT1, 141079, 136617, 10563, 7482, 3988
E12Siding Spring Survey in New South Wales, 1 in MPEC 2008-A60 -- 1994 AW1
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2008-A60 -- 2005 EC224, 2002 AV31, 1996 AJ1
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2008-A60 -- 2008 AS28, 2008 AE4, 2007 YQ56

Impact Risk Monitoring  on 13 January '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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
2008 AS28NEODyS15362013-2090931.17e-07-3.70-4.510NEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2008/01/10.136 to 2008/01/13.152."
JPL Sentry15352013-2107628.4e-08-3.88-4.440JPL: "Analysis based on 25 observations spanning 3.0159 days (2008-Jan-10.135 to 2008-Jan-13.15092)." Diameter approximately 0.441 km. from mean, weighted H=19.4.
2008 AE4JPL Sentry1535R E M O V E DJPL: Risk listing removed at 1248 UTC.
2007 YQ56JPL Sentry15352094-210031.4e-09-6.60-6.900JPL: "Analysis based on 69 observations spanning 12.956 days (2007-Dec-31.14551 to 2008-Jan-13.10184)." Diameter approximately 0.340 km. from mean, weighted H=20.0.

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 13 January '08

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

1536Grabbed MPEC 2008-A60 - Daily Orbit Update - see above
1535Noted that JPL Sentry has updated its 2007 YQ56 risk assessment - see above
Noted that JPL Sentry has removed 2008 AE4 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 AS28 risk assessment - see above
1534Noted that NEODyS has posted 2008 AS28 as an impact risk - see above
0404Grabbed MPEC 2008-A59 - 2008 AF3 - see above