Contents  on 10 December '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 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 10 December '08

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2358 UTC). It was last noted active yesterday.

New MPECs  on 10 December '08

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 10 Dec. '08 >>  MPEC 2008-X71 - "07:09 UT" - Daily Orbit Update

Observers  on 10 December '08

Eight observing facilities appear in today's MPEC.

CodeObserver / observatory
203GiaGa Obs. in Italy, 3 in MPEC 2008-X71 -- 2008 XM1, 2008 XC1, 162900
J95Great Shefford Obs. in England, 4 in MPEC 2008-X71 -- 2008 XU2, 2008 XP, 2008 XC1, 2005 CV25
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2008-X71 -- 2008 UE7
130Lumezzane Obs. in Italy, 15 in MPEC 2008-X71 -- 2008 XB2, 2008 XA2, 2008 WL60, 2008 WB59, 2008 VU4, 2008 MZ, 2002 VY94, 2001 LM5, 53430, 199801, 194386, 162900, 153306, 136923, 136849
J69North Obs. in England, 1 in MPEC 2008-X71 -- 2008 UE7
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2008-X71 -- 2008 XC1, 2008 EV5, 2004 XY60, 8035, 1943
B40Skylive Obs. in Italy, 1 in MPEC 2008-X71 -- 2008 UE7
587Sormano Obs. in Italy, 1 in MPEC 2008-X71 -- 2008 WD14
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 December '08

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.
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 XU2NEODyS1449203911.28e-07-7.00-7.000NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2008/12/06.262 to 2008/12/10.111."
JPL Sentry1448203911.3e-07-7.00-7.000JPL: "Analysis based on 29 observations spanning 3.8487 days (2008-Dec-06.2616 to 2008-Dec-10.11029)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
2008 XC1NEODyS14492085-208825.91e-06-4.75-4.950NEODyS: "Based on 97 optical observations (of which 1 are rejected as outliers) from 2008/12/03.369 to 2008/12/09.981."
JPL Sentry14482085-208827.1e-06-4.67-4.880JPL: "Analysis based on 97 observations spanning 6.6124 days (2008-Dec-03.36799 to 2008-Dec-09.98036)." Diameter approximately 0.065 km. from mean, weighted H=23.6.

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 10 December '08

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

1449Noted that NEODyS has updated its 2008 XC1 risk assessment - see above
Noted that NEODyS has updated its 2008 XU2 risk assessment - see above
Grabbed MPEC 2008-X71 - Daily Orbit Update - see above
1448Noted that JPL Sentry has updated its 2008 XC1 risk assessment - see above
Noted that JPL Sentry has updated its 2008 XU2 risk assessment - see above