Contents  on 17 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 17 December '08

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There was one listing noted earlier today.

New MPECs  on 17 December '08

Minor Planet Electronic Circulars

As of last check at 2255 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-Y03 - "13:18 UT" - 2008 YA

<< DOU on 17 Dec. '08 >>  MPEC 2008-Y02 - "07:07 UT" - Daily Orbit Update

Observers  on 17 December '08

Eleven observing facilities appear in today's MPECs.

CodeObserver / observatory
807&Lawrence H. Wasserman via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2008-Y02 -- 2008 UK90
448Desert Moon Obs. in New Mexico, 2 in MPEC 2008-Y02 -- 2008 XE2, 2008 WK96
J95Great Shefford Obs. in England, 4 in MPEC 2008-Y02 -- 2008 XV2, 2008 XQ2, 2008 XP2, 2008 UL90
B15Inastars Obs. in Germany, 1 in MPEC 2008-Y02 -- 52762
704LINEAR in New Mexico, 1 in MPEC 2008-Y02 -- 162004
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2008-Y02 -- 52762
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2008-Y02 -- 2008 SR7
204Schiaparelli Obs. in Italy, 3 in MPEC 2008-Y02 -- 2008 XB2, 2008 WK96, 2008 WD14
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2008-Y02 & 2008-Y03 -- 2008 YA, 2008 EV5, 164400
071Smolyan Obs. in Bulgaria, 7 in MPEC 2008-Y02 -- 2008 SQ, 2006 WZ2, 16960, 163000, 162900, 144901, 137032
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-Y02 -- 2008 TA1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 December '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2255 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 XQ2JPL Sentry1430R E M O V E DJPL: Risk listing removed at 0950 UTC.
NEODyS1430R E M O V E D-
2008 WK96JPL Sentry14302024-203121.0e-05-3.55-3.550JPL: "Analysis based on 39 observations spanning 16.054 days (2008-Nov-30.38762 to 2008-Dec-16.44151)." Diameter approximately 0.083 km. from mean, weighted H=23.1.
NEODyS14302024-203121.22e-05-3.49-3.490NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/16.442."

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 17 December '08

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

1430Noted that JPL Sentry has updated its 2008 WK96 risk assessment - see above
Noted that NEODyS has updated its 2008 WK96 risk assessment - see above
Noted that JPL Sentry has removed 2008 XQ2 as an impact risk - see above
Noted that NEODyS has removed 2008 XQ2 as an impact risk - see above
Grabbed MPEC 2008-Y02 - Daily Orbit Update - see above
Grabbed MPEC 2008-Y03 - 2008 YA - see above
Noted that the NEOCP has become empty