Contents  on 27 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 27 December '07

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and one updated listing. Of these, one was a "one nighter."

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 27 December '07

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 27 Dec. '07 >>  MPEC 2007-Y50 - "07:07 UT" - Daily Orbit Update

Observers  on 27 December '07

Nine observing facilities appear in today's MPEC.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 8 in MPEC 2007-Y50 -- 2007 YB2, 2007 NS4, 2003 YS117, 2002 CF26, 2001 VK5, 2000 SB8, 2000 ER70, 1990 SM
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2007-Y50 -- 2007 XH16
J95Great Shefford Obs. in England, 1 in MPEC 2007-Y50 -- 2007 XH16
6951Marc W. Buie via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2007-Y50 -- 2007 UR3
J34La Fecha Obs. in Spain, 4 in MPEC 2007-Y50 -- 2007 XH16, 2007 WF55, 2005 XD1, 153591
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-Y50 -- 99935
A24New Millennium Obs. in Italy, 12 in MPEC 2007-Y50 -- 2007 TG15, 2005 XK8, 2005 XD1, 2003 BH84, 1993 TQ2, 85804, 68359, 21374, 18736, 170903, 138947, 1580
B49Paus Obs. in Spain, 1 in MPEC 2007-Y50 -- 2007 YZ
A78Stia Obs. in Italy, 2 in MPEC 2007-Y50 -- 2007 YX1, 2007 YM1

Impact Risk Monitoring  on 27 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 YB2NEODyS17062040-208435.74e-08-3.72-3.760NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2007/12/18.346 to 2007/12/25.452."
JPL Sentry14312043-209845.9e-08-3.74-3.790JPL: "Analysis based on 44 observations spanning 7.1059 days (2007-Dec-18.34552 to 2007-Dec-25.45139)." Diameter approximately 0.786 km. from mean, weighted H=18.2.

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 27 December '07

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

1905The NEOCP has become active
1706Noted that NEODyS has updated its 2007 YB2 risk assessment - see above
1431Noted that JPL Sentry has updated its 2007 YB2 risk assessment - see above
Grabbed MPEC 2007-Y50 - Daily Orbit Update - see above