Contents  on 9 December '07


The latest news: framed access (best), RSS news feed RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup 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 this year 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 9 December '07

The MPC's NEO Confirmation Page has 10 listings: 5 new, 5 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five new and five updated listings. Of these, six were "one nighters."

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 9 December '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 9 Dec. '07 >>  MPEC 2007-X39 - "07:10 UT" - Daily Orbit Update

Observers  on 9 December '07

Seven observing facilities appear in today's MPEC.

CodeObserver / observatory
B37Ametlla del Valles Obs. in Spain, 1 in MPEC 2007-X39 -- 68359
H55Astronomical Research Obs. (ARO) in Illinois, 10 in MPEC 2007-X39 -- 2007 XT3, 2007 XQ3, 2007 XP3, 2007 XP, 2007 XN, 2007 UQ51, 2007 RE1, 2004 SB20, 2004 DC, 2003 AZ2
B09Capannoli Obs. in Italy, 2 in MPEC 2007-X39 -- 2007 WF55, 2007 SP6
J95Great Shefford Obs. in England, 1 in MPEC 2007-X39 -- 2007 XZ9
B34Green Island Obs. in Cyprus, 1 in MPEC 2007-X39 -- 2007 US6
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-X39 -- 2007 VQ4, 2007 SP6, 2007 PU11, 2003 BH84
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2007-X39 -- 2002 RC118, 85275

Impact Risk Monitoring  on 9 December '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now 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
2007 XZ9JPL Sentry15082056-208941.5e-06-5.77-6.040JPL: "Analysis based on 33 observations spanning 4.8453 days (2007-Dec-04.19408 to 2007-Dec-09.0394)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
NEODyS15082056-208971.68e-06-5.70-6.060NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2007/12/04.195 to 2007/12/09.040."
2007 XP3JPL Sentry15082033-2104172.2e-08-3.87-4.520JPL: "Analysis based on 14 observations spanning 2.0150 days (2007-Dec-04.38257 to 2007-Dec-06.397618)." Diameter approximately 0.701 km. from mean, weighted H=18.4.
NEODyS15082033-2071142.16e-08-3.90-4.470NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2007/12/04.383 to 2007/12/06.398."

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 9 December '07

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

1508Noted that NEODyS has updated its 2007 XP3 risk assessment - see above
Noted that NEODyS has updated its 2007 XZ9 risk assessment - see above
1507Noted that JPL Sentry has updated its 2007 XP3 risk assessment - see above
Noted that JPL Sentry has updated its 2007 XZ9 risk assessment - see above
Grabbed MPEC 2007-X39 - Daily Orbit Update - see above