Contents  on 6 January '08


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 6 January '08

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."

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 6 January '08

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 6 Jan. '08 >>  MPEC 2008-A26 - "07:08 UT" - Daily Orbit Update

Observers  on 6 January '08

Six observing facilities appear in today's MPEC.

CodeObserver / observatory
726Brainerd Obs. in Minnesota, 2 in MPEC 2008-A26 -- 2007 YZ, 2005 WJ56
J95Great Shefford Obs. in England, 8 in MPEC 2008-A26 -- 2008 AE, 2007 YV56, 2007 YV29, 2007 YU56, 2007 YT56, 2007 YS56, 2007 YR56, 2007 YQ56
704LINEAR in New Mexico, 1 in MPEC 2008-A26 -- 25916
900Moriyama Obs. in Japan, 1 in MPEC 2008-A26 -- 68359
474Mt. John Obs. in New Zealand, 2 in MPEC 2008-A26 -- 2007 YS56, 2007 XN
J93Mt. Tuffley Obs. in England, 4 in MPEC 2008-A26 -- 170891, 153591, 4954, 1036

Impact Risk Monitoring  on 6 January '08

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 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 YV56JPL Sentry1506R E M O V E DJPL: Risk listing removed at 1128 UTC.
2007 YS56JPL Sentry1506210415.3e-08-7.99-7.990JPL: "Analysis based on 40 observations spanning 5.6843 days (2007-Dec-31.24562 to 2008-Jan-05.92995)." Diameter approximately 0.024 km. from mean, weighted H=25.7.
2007 YQ56JPL Sentry15062027-2107345.3e-07-3.69-4.170JPL: "Analysis based on 48 observations spanning 5.7195 days (2007-Dec-31.14551 to 2008-Jan-05.86499)." Diameter approximately 0.360 km. from mean, weighted H=19.9.
NEODyS15062027-2090465.66e-07-3.63-4.080NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2007/12/31.146 to 2008/01/05.866."

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 6 January '08

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

1506Noted that JPL Sentry has updated its 2007 YQ56 risk assessment - see above
Noted that NEODyS has updated its 2007 YQ56 risk assessment - see above
Noted that JPL Sentry has reposted 2007 YS56 as an impact risk - see above
Noted that JPL Sentry has removed 2007 YV56 as an impact risk - see above
Grabbed MPEC 2008-A26 - Daily Orbit Update - see above