Contents  on 30 December '07


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 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 30 December '07

The MPC's NEO Confirmation Page has 7 listings: 2 new, 5 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two 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 30 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-Y55 - "18:26 UT" - 2007 YX1

<< DOU on 30 Dec. '07 >>  MPEC 2007-Y54 - "07:07 UT" - Daily Orbit Update

Observers  on 30 December '07

Fifteen observing facilities appear in today's MPECs.

CodeObserver / observatory
I77CEAMIG-REA in Brazil, 1 in MPEC 2007-Y54 -- 2007 PU11
B09Capannoli Obs. in Italy, 1 in MPEC 2007-Y54 -- 2007 YZ
J95Great Shefford Obs. in England, 1 in MPEC 2007-Y54 -- 2007 YV29
B34Green Island Obs. in Cyprus, 1 in MPEC 2007-Y54 -- 2007 US6
B19Iluro Obs. in Spain, 3 in MPEC 2007-Y54 -- 2005 WJ56, 154347, 3288
B15Inastars Obs. in Germany, 1 in MPEC 2007-Y54 -- 137084
J44Iturrieta Obs. in Spain, 2 in MPEC 2007-Y54 -- 2005 WJ56, 1993 TQ2
246KLENOT in the Czech Republic, 2 in MPEC 2007-Y54 -- 2007 YM1, 2007 XK11
704LINEAR in New Mexico, 2 in MPEC 2007-Y54 -- 66959, 170903
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2007-Y54 -- 2007 YH, 2007 WF55
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-Y54 -- 143678
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2007-Y55 -- 2007 YX1
A24New Millennium Obs. in Italy, 15 in MPEC 2007-Y54 -- 2007 WF55, 2007 TG8, 2007 TG15, 2005 XK8, 2005 XD1, 2003 BH84, 99935, 86324, 85804, 21374, 20826, 18736, 170903, 143678, 137084
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2007-Y54 -- 2007 YZ, 2007 YX1, 2007 XH16, 2007 SP6, 2005 XD1, 2005 TU45, 2002 XY4, 99935, 90403, 86324, 170502, 4450, 1862
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2007-Y54 -- 2007 YN1, 2007 YJ1, 2007 XQ3, 2007 XN16, 2007 XJ16, 2007 VG189

Impact Risk Monitoring  on 30 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 YV29JPL Sentry1454R E M O V E DJPL: Risk listing removed at 1122 UTC.
2007 XK11JPL Sentry1454210116.5e-09-5.79-5.790JPL: "Analysis based on 64 observations spanning 23.697 days (2007-Dec-06.0886 to 2007-Dec-29.7854)." Diameter approximately 0.470 km. from mean, weighted H=19.3.

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 30 December '07

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

1859Grabbed MPEC 2007-Y55 - 2007 YX1 - see above
1454Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above
Noted that JPL Sentry has removed 2007 YV29 as an impact risk - see above
Grabbed MPEC 2007-Y54 - Daily Orbit Update - see above
1453The NEOCP has become active