Contents  on 1 December '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 1 December '07

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

When last checked at 2355 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 four 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 1 December '07

Minor Planet Electronic Circulars

As of last check at 2355 UTC, there have been six MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-X06 - "21:22 UT" - 2007 RW10, 2007 RG283, 2007 RH283

MPEC 2007-X05 - "14:49 UT" - Comet C/2007 W1 (Boattini)

<< DOU on 1 Dec. '07 >>  MPEC 2007-X04 - "07:10 UT" - Daily Orbit Update

MPEC 2007-X03 - "00:47 UT" - 2007 WF55

MPEC 2007-X02 - "00:44 UT" - 2007 WE55

MPEC 2007-X01 - "00:40 UT" - 2003 BH84

Observers  on 1 December '07

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 1 in MPEC 2007-X05 -- C/2007 W1
H55Astronomical Research Obs. (ARO) in Illinois, 19 in MPECs 2007-X01 & 2007-X04 -- 2007 WZ4, 2007 WX4, 2007 WT4, 2007 WT3, 2007 WM3, 2007 WB5, 2007 VX7, 2007 VW137, 2007 VL8, 2007 VJ184, 2007 VH8, 2007 VF191, 2007 VD3, 2007 UQ51, 2007 TD71, 2007 TB23, 2007 RF5, 2007 ML6, 2003 BH84
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2007-X05 -- C/2007 W1
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2007-X01, 2007-X03 & 2007-X04 -- 2007 WF55, 2007 WE55, 2003 BH84
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2007-X04 -- 2007 US6
704LINEAR in New Mexico, 3 in MPECs 2007-X01, 2007-X02 & 2007-X03 -- 2007 WF55, 2007 WE55, 2003 BH84
699LONEOS in Arizona, 1 in MPEC 2007-X04 -- 2006 US216
J87La Canada Obs. in Spain, 1 in MPEC 2007-X01 -- 2003 BH84
688Lowell Obs. Anderson Mesa Station in Arizona, 3 in MPEC 2007-X06 -- 2007 RW10, 2007 RH283, 2007 RG283
130Lumezzane Obs. in Italy, 3 in MPECs 2007-X01, 2007-X02 & 2007-X03 -- 2007 WF55, 2007 WE55, 2003 BH84
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2007-X04 -- 2007 WZ4, 2007 WV4
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-X04 -- 66251
213Montcabre Obs. in Spain, 1 in MPEC 2007-X05 -- C/2007 W1
675Mt. Palomar in southern California, 3 in MPEC 2007-X06 -- 2007 RW10, 2007 RH283, 2007 RG283
A13Naef Obs. in Switzerland, 1 in MPEC 2007-X04 -- 170903
H85Silver Spring Obs. in Maryland, 1 in MPEC 2007-X04 -- 2007 WZ4

Impact Risk Monitoring  on 1 December '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2355 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 WE55JPL Sentry1504R E M O V E DJPL #2 for the day: Risk listing removed at 1129 UTC.
2007 WT3JPL Sentry1504210116.9e-08-6.78-6.780JPL: "Analysis based on 18 observations spanning 11.879 days (2007-Nov-18.29804 to 2007-Nov-30.177151)." Diameter approximately 0.051 km. from mean, weighted H=24.1.

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 1 December '07

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

2145Grabbed MPEC 2007-X06 - 2007 RW10, 2007 RG283, 2007 RH283 - see above
1504Noted that JPL Sentry has removed 2007 WE55 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 WT3 risk assessment - see above
1503Grabbed MPEC 2007-X04 - Daily Orbit Update - see above
Grabbed MPEC 2007-X05 - Comet C/2007 W1 (Boattini) - see above
0436Noted that JPL Sentry has posted 2007 WE55 as an impact risk - see above
0207Grabbed MPEC 2007-X01 - 2003 BH84 - see above
Grabbed MPEC 2007-X02 - 2007 WE55 - see above
Grabbed MPEC 2007-X03 - 2007 WF55 - see above