Contents  on 15 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 15 December '07

The MPC's NEO Confirmation Page has 6 listings: 3 new, 3 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and three updated listings. All of these were "one nighters." So far The Tracking News has counted a total of nine 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 15 December '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-X62 - "23:29 UT" - 2007 JF43

MPEC 2007-X61 - "16:17 UT" - 2007 XB23

MPEC 2007-X60 - "16:09 UT" - 2007 XA23

<< DOU on 15 Dec. '07 >>  MPEC 2007-X59 - "07:10 UT" - Daily Orbit Update

Observers  on 15 December '07

Fifteen observing facilities appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2007-X59 -- 2007 PU11
H55Astronomical Research Obs. (ARO) in Illinois, 2 in MPEC 2007-X59 -- 2007 XJ20, 2007 VD138
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2007-X59 -- 1994 AW1, 96189, 66272, 162004
651Grasslands Obs. in Arizona, 1 in MPEC 2007-X60 -- 2007 XA23
704LINEAR in New Mexico, 14 in MPECs 2007-X59 & 2007-X60 -- 2007 XT3, 2007 XA23, 2007 UX1, 2007 OG3, 2002 XY4, 1994 AW1, 66407, 25916, 19764, 153201, 138947, 9172, 5131, 4503
J34La Fecha Obs., 3 in MPEC 2007-X59 -- 2003 BH84, 85804, 153591
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2007-X59 -- 2005 WR2
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2007-X62 -- 2007 JF43
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2007-X59 -- 2007 VQ4, 2007 SP6, 2005 TU45, 1993 TQ2, 90403, 85804, 68359, 170891, 153201, 138947
D29Purple Mtn. Obs. XuYi Station in China, 2 in MPEC 2007-X59 -- 2007 SP6, 90403
E12Siding Spring Survey in New South Wales, 1 in MPEC 2007-X61 -- 2007 XB23
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-X59 -- 18736
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2007-X59 -- 2007 XY9, 2007 XK11, 2005 LW39
147Suno Obs. in Italy, 1 in MPEC 2007-X59 -- 2007 XF18
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-X60 -- 2007 XA23

Impact Risk Monitoring  on 15 December '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 XF18JPL Sentry14002015-208931.1e-09-5.56-5.580JPL: "Analysis based on 20 observations spanning 1.6736 days (2007-Dec-12.20514 to 2007-Dec-13.87874)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
2007 XK11NEODyS14012029-207334.77e-08-4.75-4.760NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/15.154."
JPL Sentry14002064-210127.1e-08-4.50-4.570JPL: "Analysis based on 36 observations spanning 9.0648 days (2007-Dec-06.0886 to 2007-Dec-15.15344)." Diameter approximately 0.498 km. from mean, weighted H=19.1.

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 15 December '07

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

2354Grabbed MPEC 2007-X62 - 2007 JF43 - see above
1703Grabbed MPEC 2007-X60 - 2007 XA23 - see above
Grabbed MPEC 2007-X61 - 2007 XB23 - see above
1401Noted that NEODyS has updated its 2007 XK11 risk assessment - see above
Grabbed MPEC 2007-X59 - Daily Orbit Update - see above
1400Noted that JPL Sentry has updated its 2007 XF18 risk assessment - see above
Noted that NEODyS has removed 2007 XF18 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above