Contents  on 14 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 14 December '07

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

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five new listings. Of these, four were "one nighters." So far The Tracking News has counted a total of six 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 14 December '07

Minor Planet Electronic Circulars

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

MPEC 2007-X58 - "17:54 UT" - 2006 NM

MPEC 2007-X57 - "14:06 UT" - 2007 XJ20

<< DOU on 14 Dec. '07 >>  MPEC 2007-X56 - "07:11 UT" - Daily Orbit Update

Observers  on 14 December '07

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2007-X58 -- 2006 NM
B09Capannoli Obs. in Italy, 3 in MPEC 2007-X56 -- 2007 WF55, 2007 TG15, 21374
448Desert Moon Obs. in New Mexico, 9 in MPEC 2007-X56 -- 2007 XY9, 2007 XK11, 2007 XC10, 2007 WV4, 2007 WV3, 2007 VG184, 2005 GE59, 2003 WM25, 66407
704LINEAR in New Mexico, 12 in MPECs 2007-X56 & 2007-X57 -- 2007 XJ20, 2007 UB6, 2007 RU12, 2004 BD85, 2002 XY4, 68063, 34613, 31346, 18736, 153201, 144411, 9400
J34La Fecha Obs., 1 in MPEC 2007-X56 -- 86324
B49Paus Obs. in Spain, 1 in MPEC 2007-X56 -- 2007 VQ4
D29Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2007-X56 -- 5131
B04Saint-Barthelemy Obs. in Italy, 1 in MPEC 2007-X56 -- 2003 BH84
204Schiaparelli Obs. in Italy, 1 in MPEC 2007-X57 -- 2007 XJ20
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2007-X56 -- 2007 XH16, 2006 US216
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2007-X56 -- 2007 TD71, 2007 MK13, 1998 QR15
6739Heath Rhoades via Table Mtn. Obs. in southern California, 1 in MPEC 2007-X57 -- 2007 XJ20

Impact Risk Monitoring  on 14 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 XF18NEODyS13452020-2090509.85e-08-4.15-4.650NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2007/12/12.206 to 2007/12/13.413."
2007 XK11NEODyS13452029-208254.16e-08-4.73-4.860NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/13.179."
JPL Sentry13442029-210163.7e-07-3.94-4.280JPL: "Analysis based on 33 observations spanning 7.0894 days (2007-Dec-06.0886 to 2007-Dec-13.17795)." Diameter approximately 0.492 km. from mean, weighted H=19.2.

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 14 December '07

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

1811Grabbed MPEC 2007-X58 - 2006 NM - see above
1412Grabbed MPEC 2007-X57 - 2007 XJ20 - see above
1345Noted that NEODyS has updated its 2007 XK11 risk assessment - see above
1344Noted that NEODyS has posted 2007 XF18 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above
Grabbed MPEC 2007-X56 - Daily Orbit Update - see above