Contents  on 4 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 4 January '08

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing. So far The Tracking News has counted a total of two 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 4 January '08

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 2008-A23 - "13:48 UT" - 2008 AS

<< DOU on 4 Jan. '08 >>  MPEC 2008-A22 - "07:08 UT" - Daily Orbit Update

Observers  on 4 January '08

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-A23 -- 2008 AS
808El Leoncito Obs. in Argentina, 5 in MPEC 2008-A22 -- 2007 VR183, 2007 PU11, 2005 TU45, 2002 RC118, 7977
151Eschenberg Obs. in Switzerland, 2 in MPEC 2008-A22 -- 2007 SP6, 2005 WJ56
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-A23 -- 2008 AS
J95Great Shefford Obs. in England, 1 in MPEC 2008-A22 -- 2007 YR56
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2008-A22 -- 2000 CH59
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2008-A22 -- 2007 YZ, 2007 PU11, 2005 WJ56, 2005 TU45, 68359, 170891
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-A22 -- 3288
474Mt. John Obs. in New Zealand, 5 in MPECs 2008-A22 & 2008-A23 -- 2008 AS, 2008 AE, 2007 YS56, 2007 WQ3, 2003 GW
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-A23 -- 2008 AS
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2008-A22 -- 2008 AE, 2007 YZ, 2007 YV56, 2007 VQ4, 2005 WJ56, 2005 TU45, 1993 TQ2, 1989 AZ, 99935, 90403, 66407, 170903, 154347
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2008-A22 & 2008-A23 -- 2008 AS, 2002 RC118
645Sloan Digital Sky Survey in New Mexico, 1 in MPEC 2008-A22 -- 2007 WD5
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2008-A22 -- 2007 YJ1, 2006 BT7, 2005 CZ36, 2004 HK33, 1999 RQ28
6967Tim Spahr via Whipple Obs. in Arizona, 4 in MPEC 2008-A22 -- 2007 XQ3, 2007 XO3, 2007 XJ16, 2004 YC5
198Wildberg Obs. in Germany, 1 in MPEC 2008-A22 -- 2008 AE

Impact Risk Monitoring  on 4 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
2008 AEJPL Sentry1412R E M O V E DJPL: Risk listing removed at 1225 UTC.
2007 YV56JPL Sentry1412210314.7e-09-6.47-6.470JPL: "Analysis based on 39 observations spanning 2.9436 days (2007-Dec-31.5148 to 2008-Jan-03.45842)." Diameter approximately 0.210 km. from mean, weighted H=21.0.
2007 YS56JPL Sentry1412210411.2e-07-7.63-7.630JPL: "Analysis based on 30 observations spanning 3.2500 days (2007-Dec-31.24562 to 2008-Jan-03.4956)." Diameter approximately 0.024 km. from mean, weighted H=25.7.

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 4 January '08

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

1412Noted that JPL Sentry has updated its 2007 YS56 risk assessment - see above
Noted that JPL Sentry has updated its 2007 YV56 risk assessment - see above
Noted that NEODyS has removed 2007 YV56 as an impact risk - see above
Noted that JPL Sentry has removed 2008 AE as an impact risk - see above
Noted that NEODyS has removed 2008 AE as an impact risk - see above
Grabbed MPEC 2008-A22 - Daily Orbit Update - see above
Grabbed MPEC 2008-A23 - 2008 AS - see above