Contents  on 2 December '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 2 December '09

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2357 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. Of these, two were "one nighters."

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 2 December '09

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 2 Dec. '09 >>  MPEC 2009-X03 - "07:10 UT" - Daily Orbit Update

Observers  on 2 December '09

Five observing facilities appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield (ARO Westfield) in Illinois, 12 in MPEC 2009-X03 -- 2009 WZ104, 2009 WX51, 2009 WW25, 2009 WV25, 2009 WP106, 2009 WN25, 2009 WA105, 2009 VA1, 2009 TM10, 2009 TF10, 2008 WB59, 1993 RA
568[Ovidiu Vaduvescu on Mauna Kea in Hawaii, 60 in MPEC 2009-X03 -- 2008 OX2, 2008 DJ, 2008 CR118, 2008 AF4, 2006 SU49, 2006 PA1, 2006 AM4, 2005 WA1, 2005 VO5, 2005 RR6, 2005 JE46, 2005 HB4, 2005 GY8, 2005 CJ, 2004 UL, 2004 RF84, 2004 AE, 2003 YG118, 2001 UZ16, 90416, 88254, 68359, 65717, 54071, 53319, 52689, 31346, 27031, 24475, 222008, 217683, 212546, 209924, 20425, 198856, 19356, 18109, 171819, 164342, 164202, 163250, 162698, 162038, 159923, 159608, 154453, 153315, 153219, 152754, 143381, 141851, 141761, 138893, 138013, 137925, 137078, 136617, 102873, 4587, 4179
J47Nazaret Obs. in Spain, 1 in MPEC 2009-X03 -- 4015
926Tenagra II Obs. in Arizona, 2 in MPEC 2009-X03 -- 2009 WZ104, 2009 WN25
718Wiggins Obs. in Utah, 1 in MPEC 2009-X03 -- 2009 WV25
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 December '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2357 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 WX51JPL Sentry1612R E M O V E DJPL: Risk listing removed at 0949 UTC.
NEODyS1612R E M O V E D-
2008 AF4JPL Sentry16122099-210021.7e-07-4.48-4.480JPL: "Analysis based on 607 observations spanning 296.97 days (2007-Jul-28.34795 to 2008-May-20.315005)." Diameter approximately 0.400 km. from mean, weighted H=19.7.

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 2 December '09

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

1612Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
Noted that JPL Sentry has removed 2009 WX51 as an impact risk - see above
Noted that NEODyS has removed 2009 WX51 as an impact risk - see above
Grabbed MPEC 2009-X03 - Daily Orbit Update - see above