Contents  on 25 January '09


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.

NEOCP Activity  on 25 January '09

The MPC's NEO Confirmation Page has 6 listings: 2 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and four updated listings. Of these, five were "one nighters." So far The Tracking News has counted a total of seven 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 25 January '09

Minor Planet Electronic Circulars

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

MPEC 2009-B52 - "21:23 UT" - 2004 SV55 = 1983 SN

<< DOU on 25 Jan. '09 >>  MPEC 2009-B51 - "07:05 UT" - Daily Orbit Update

Observers  on 25 January '09

Seven observing facilities appear in today's MPECs.

CodeObserver / observatory
B84Cyclops Obs. in The Netherlands, 1 in MPEC 2009-B51 -- 2009 AF16
379Hamamatsu-Yuto Obs. in Japan, 8 in MPEC 2009-B51 -- 2009 BM2, 2009 AD16, 2008 QT3, 2008 EV5, 2006 WZ2, 2006 AS2, 2005 BC, 4179
704LINEAR in New Mexico, 1 in MPEC 2009-B52 -- 2004 SV55
D29Purple Mtn. Obs. XuYi Station (XuYi Sta.) in China, 3 in MPEC 2009-B51 -- 2001 BJ16, 1999 CW8, 198752
204Schiaparelli Obs. in Italy, 3 in MPEC 2009-B51 -- 2009 BO5, 2009 BM2, 2009 AD16
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2009-B51 -- 2009 AL, 2008 XB1, 2008 UW5, 2000 YJ29
H53Thompsonville Obs. in Illinois, 4 in MPEC 2009-B51 -- 2008 UC, 2008 MB5, 2006 AS2, 2000 BL19
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 January '09

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 some objects with impact solutions beyond 100 years.
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
2009 ALJPL Sentry1625209015.9e-08-5.89-5.890JPL: "Analysis based on 50 observations spanning 23.832 days (2009-Jan-01.29931 to 2009-Jan-25.13085)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
NEODyS1625209016.77e-08-5.83-5.830NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2009/01/01.300 to 2009/01/25.132."

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 25 January '09

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

2137Grabbed MPEC 2009-B52 - 2004 SV55 = 1983 SN - see above
1625Noted that JPL Sentry has updated its 2009 AL risk assessment - see above
Noted that NEODyS has updated its 2009 AL risk assessment - see above
Grabbed MPEC 2009-B51 - Daily Orbit Update - see above
Noted that the NEOCP has become active