Contents  on 24 November '07


The latest news: framed access (best), RSS news feed RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup 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 24 November '07

The MPC's NEO Confirmation Page has 9 listings: 7 new, 2 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had seven new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of ten 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 24 November '07

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 24 Nov. '07 >>  MPEC 2007-W64 - "07:07 UT" - Daily Orbit Update

Observers  on 24 November '07

Seven observing facilities appear in today's MPEC.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2007-W64 -- 2007 UR51
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2007-W64 -- 2007 VQ4, 2007 VJ3
448Desert Moon Obs. in New Mexico, 4 in MPEC 2007-W64 -- 2007 VD184, 2007 VA188, 2007 TG8, 2007 PA8
J95Great Shefford Obs. in England, 3 in MPEC 2007-W64 -- 2007 WV4, 2007 VE191, 2007 SE11
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2007-W64 -- 2007 VD12
J69North Obs. in England, 1 in MPEC 2007-W64 -- 2007 VD12
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-W64 -- 2007 VZ30

Impact Risk Monitoring  on 24 November '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 WV4NEODyS14522023-2089642.25e-07-3.37-3.970NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2007/11/19.394 to 2007/11/24.059."
JPL Sentry14502023-2107491.8e-07-3.50-4.090JPL: "Analysis based on 14 observations spanning 4.6648 days (2007-Nov-19.39373 to 2007-Nov-24.05852)." Diameter approximately 0.476 km. from mean, weighted H=19.3.
2007 VE191NEODyS1452201511.08e-05-3.45-3.450NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2007/11/15.267 to 2007/11/23.944."
JPL Sentry1450201519.6e-06-3.51-3.510JPL: "Analysis based on 45 observations spanning 8.6773 days (2007-Nov-15.26603 to 2007-Nov-23.94335)." Diameter approximately 0.058 km. from mean, weighted H=23.8.
2007 VJ3JPL Sentry1450R E M O V E DJPL: Risk listing removed at 1202 UTC.

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 24 November '07

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

1452Noted that NEODyS has updated its 2007 VE191 risk assessment - see above
Noted that NEODyS has updated its 2007 WV4 risk assessment - see above
1451Grabbed MPEC 2007-W64 - Daily Orbit Update - see above
1450Noted that JPL Sentry has updated its 2007 VE191 risk assessment - see above
Noted that JPL Sentry has removed 2007 VJ3 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 WV4 risk assessment - see above