Contents  on 23 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 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 23 January '08

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

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two updated listings.

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 23 January '08

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.

<< DOU on 23 Jan. '08 >>  MPEC 2008-B37 - "07:10 UT" - Daily Orbit Update

MPEC 2008-B36 - "04:48 UT" - Comets C/2007 X1, 2007 X2, 2007 X3, 2007 X4, 2007 X5 (SOHO)

MPEC 2008-B35 - "04:41 UT" - Comets C/2007 W9, 2007 W10, 2007 W11, 2007 W12 (SOHO)

Observers  on 23 January '08

Five observing facilities appear in today's MPECs.

CodeObserver / observatory
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2008-B37 -- 66407
H51Greiner Research Obs. in Wisconsin, 8 in MPEC 2008-B37 -- 2008 AF4, 68359, 170891, 153591, 5131, 4954, 1685, 1036
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-B37 -- 2008 AE4
2492LASCO Coronagraph 2 (SOHO C2) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 9 in MPECs 2008-B35 & 2008-B36 -- C/2007 X5, C/2007 X4, C/2007 X3, C/2007 X2, C/2007 X1, C/2007 W9, C/2007 W12, C/2007 W11, C/2007 W10
2493LASCO Coronagraph 3 (SOHO C3) via the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 2 in MPEC 2008-B36 -- C/2007 X5, C/2007 X4
691Spacewatch 0.9m telescope in Arizona, 10 in MPEC 2008-B37 -- 2008 AV28, 2007 YT56, 2006 NM, 2006 KT1, 2006 BA148, 2004 BG121, 2003 QB90, 1999 RQ28, 162058, 9172

Impact Risk Monitoring  on 23 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 and our ephemerides page for a list of objects under current observation.
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
2008 AF4JPL Sentry15562088-2099241.6e-05-2.52-2.960JPL: "Analysis based on 215 observations spanning 12.778 days (2008-Jan-10.39652 to 2008-Jan-23.17423)." Diameter approximately 0.380 km. from mean, weighted H=19.8.
NEODyS15562078-2090116.75e-06-2.87-2.960NEODyS: "Based on 218 optical observations (of which 3 are rejected as outliers) from 2008/01/10.397 to 2008/01/23.175."

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 23 January '08

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

1556Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
Grabbed MPEC 2008-B37 - Daily Orbit Update - see above
0526Grabbed MPEC 2008-B35 - Comets C/2007 W9, 2007 W10, 2007 W11, 2007 W12 (SOHO) - see above
Grabbed MPEC 2008-B36 - Comets C/2007 X1, 2007 X2, 2007 X3, 2007 X4, 2007 X5 (SOHO) - see above