Contents  on 13 February '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.

Radar Astrometry  on 13 February '09

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 2136 UTC when the database was dated 13 Feb.

NEOCP Activity  on 13 February '09

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2258 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of two objects listed on the NEOCP at some point today.

New MPECs  on 13 February '09

Minor Planet Electronic Circulars

As of last check at 2258 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-C82 - "19:38 UT" - 2009 CR4

<< DOU on 13 Feb. '09 >>  MPEC 2009-C81 - "07:05 UT" - Daily Orbit Update

Observers  on 13 February '09

Fifteen observing facilities appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 1999 AQ10
B75Betelgeuse Station in Italy, 1 in MPEC 2009-C81 -- 2008 EE5
493Calar Alto Obs. in Spain, 1 in MPEC 2009-C82 -- 2009 CR4
B09Capannoli Obs. in Italy, 1 in MPEC 2009-C81 -- 4179
924Cegep de Trois-Rivieres Obs. in Quebec, 1 in MPEC 2009-C81 -- 207398
J27El Guijo Obs. in Spain, 1 in MPEC 2009-C81 -- 2009 CV
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 1999 AQ10
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2009-C81 -- 2008 EE5, 207398, 206910
B19Iluro Obs. in Spain, 2 in MPEC 2009-C81 -- 22753, 4179
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2009-C81 -- 2008 QT3
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-C82 -- 2009 CR4
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-C81 -- 2009 AD16
510Siegen Obs. in Germany, 1 in MPEC 2009-C81 -- 2008 EE5
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2009-C81 & 2009-C82 -- 2009 CR4, 207398
198Wildberg Obs. in Germany, 1 in MPEC 2009-C81 -- 2009 CV
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 February '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2258 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
2009 CR4JPL Sentry2155206111.1e-10-8.42-8.420JPL: "Analysis based on 12 observations spanning .68389 days (2009-Feb-13.1142 to 2009-Feb-13.79809)." Diameter approximately 0.150 km. from mean, weighted H=21.8.

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 February '09

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

2155Noted that JPL Sentry has posted 2009 CR4 as an impact risk - see above
2136Noted that the NEOCP has become active
Noted Radar Astrometry database update - see above
1958Grabbed MPEC 2009-C82 - 2009 CR4 - see above
Noted that the NEOCP has become empty
1507Grabbed MPEC 2009-C81 - Daily Orbit Update - see above
0500Noted that the NEOCP has become active