Contents  on 13 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 13 December '07

The MPC's NEO Confirmation Page has 2 listings: 2 new

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new listings. Both of these were "one nighters." So far The Tracking News has counted a total of three objects listed on the NEOCP at some point today.

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 13 December '07

Minor Planet Electronic Circulars

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

MPEC 2007-X55 - "11:57 UT" - 2007 XF18

<< DOU on 13 Dec. '07 >>  MPEC 2007-X54 - "07:11 UT" - Daily Orbit Update

Observers  on 13 December '07

Eight observing facilities appear in today's MPECs.

CodeObserver / observatory
J95Great Shefford Obs. in England, 1 in MPEC 2007-X55 -- 2007 XF18
B34Green Island Obs. in Cyprus, 1 in MPEC 2007-X54 -- 2007 US6
704LINEAR in New Mexico, 3 in MPECs 2007-X54 & 2007-X55 -- 2007 XF18, 2007 RU12, 18736
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-X54 -- 66272
J69North Obs. in England, 1 in MPEC 2007-X54 -- 2007 XN16
B49Paus Obs. in Spain, 1 in MPEC 2007-X54 -- 54401
H062Robert Hutsebaut in Belgium via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-X55 -- 2007 XF18
6739Heath Rhoades via Table Mtn. Obs. in southern California, 1 in MPEC 2007-X55 -- 2007 XF18

Impact Risk Monitoring  on 13 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 XF18JPL Sentry15582023-2105391.0e-07-4.22-4.840JPL: "Analysis based on 16 observations spanning 1.2068 days (2007-Dec-12.20514 to 2007-Dec-13.41191)." Diameter approximately 0.270 km. from mean, weighted H=20.5.

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 13 December '07

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

2354The NEOCP has become active
1558Noted that JPL Sentry has posted 2007 XF18 as an impact risk - see above
1342Grabbed MPEC 2007-X54 - Daily Orbit Update - see above
Grabbed MPEC 2007-X55 - 2007 XF18 - see above
The NEOCP has become empty
0037The NEOCP has become active