Contents  on 12 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 12 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 on December 9th.

New MPECs  on 12 December '08

Minor Planet Electronic Circulars

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

MPEC 2008-X81 - "18:06 UT" - Comet P/2008 X4

MPEC 2008-X80 - "14:57 UT" - 2007 DU103

<< DOU on 12 Dec. '08 >>  MPEC 2008-X79 - "07:06 UT" - Daily Orbit Update

Observers  on 12 December '08

Eight observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2008-X79 -- 2008 XM1
G58Chabot Obs. in northern California, 2 in MPEC 2008-X79 -- 162900, 136923
448Desert Moon Obs. in New Mexico, 6 in MPEC 2008-X79 -- 2008 XV2, 2008 XM, 2008 XE3, 2008 XE2, 2008 TE157, 2005 XM4
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2008-X79 -- 2008 UE7, 2006 VB14, 4179
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-X80 -- 2007 DU103
C504HI1-B instrument (4) aboard STEREO-B in heliocentric orbit trailing Earth, 1 in MPEC 2008-X81 -- P/2008 X4
H36Sandlot Obs. in Kansas, 4 in MPEC 2008-X79 -- 2008 XW2, 2008 XV2, 2008 XC1, 2008 WQ63
E12Siding Spring Survey in New South Wales, 1 in MPEC 2008-X79 -- 2008 XC1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 XC1JPL Sentry14542085-208823.3e-08-7.01-7.060JPL: "Analysis based on 117 observations spanning 7.9652 days (2008-Dec-03.36799 to 2008-Dec-11.3332)." Diameter approximately 0.064 km. from mean, weighted H=23.6.
NEODyS1454R E M O V E D-

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 12 December '08

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

1958Grabbed MPEC 2008-X81 - Comet P/2008 X4 - see above
1600Grabbed MPEC 2008-X80 - 2007 DU103 - see above
1454Noted that JPL Sentry has updated its 2008 XC1 risk assessment - see above
Noted that NEODyS has removed 2008 XC1 as an impact risk - see above
Grabbed MPEC 2008-X79 - Daily Orbit Update - see above