Contents  on 11 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 11 December '07

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were four listings noted earlier today.

New MPECs  on 11 December '07

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 2007-X52 - "15:37 UT" - 2007 XN16

<< DOU on 11 Dec. '07 >>  MPEC 2007-X51 - "07:10 UT" - Daily Orbit Update

Observers  on 11 December '07

Ten observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2007-X51 -- 2006 YF13
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2007-X51 -- 2007 WW4
J95Great Shefford Obs. in England, 6 in MPECs 2007-X51 & 2007-X52 -- 2007 XQ3, 2007 XO3, 2007 XN16, 2007 XK11, 2007 XD10, 2007 XB10
J66Kinver Obs. in England, 2 in MPEC 2007-X51 -- 2007 VQ4, 2007 TG15
704LINEAR in New Mexico, 8 in MPECs 2007-X51 & 2007-X52 -- 2007 XN16, 2007 UX1, 25916, 19764, 18736, 138947, 136617, 9172
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2007-X51 -- 1580
J93Mt. Tuffley Obs. in England, 3 in MPEC 2007-X51 -- 153591, 4954, 1036
A24New Millennium Obs. in Italy, 21 in MPEC 2007-X51 -- 2007 WF55, 2007 VQ4, 2007 SP6, 2005 WJ56, 1993 TQ2, 89830, 86324, 85804, 68359, 68063, 21374, 18736, 170903, 170891, 154347, 137427, 136793, 3691, 3288, 1620, 1580
B49Paus Obs. in Spain, 1 in MPEC 2007-X51 -- 68359
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2007-X51 -- 2007 XH16, 2007 WW4, 2007 WQ3, 2007 VG184

Impact Risk Monitoring  on 11 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 XN16JPL Sentry20402034-206028.5e-07-6.77-6.790JPL: "Analysis based on 7 observations spanning .82537 days (2007-Dec-10.19826 to 2007-Dec-11.023634)." Diameter approximately 0.020 km. from mean, weighted H=26.2.
2007 XJ16NEODyS16382010-2087571.64e-08-4.98-5.530NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2007/12/05.384 to 2007/12/06.357."
2007 XK11NEODyS13512029-208299.03e-08-4.05-4.140NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2007/12/06.089 to 2007/12/10.926."
JPL Sentry13502029-210191.0e-07-3.92-4.010JPL: "Analysis based on 30 observations spanning 4.8362 days (2007-Dec-06.0886 to 2007-Dec-10.92484)." Diameter approximately 0.545 km. from mean, weighted H=19.0.
2007 XD10JPL Sentry1350R E M O V E DJPL: Risk listing removed at 1103 UTC.
2007 XB10NEODyS13512011-2089637.35e-08-2.59-2.840NEODyS: "Based on 17 optical observations (of which 1 are rejected as outliers) from 2007/12/05.167 to 2007/12/10.965."
JPL Sentry13502011-2104549.1e-08-2.57-2.790JPL: "Analysis based on 16 observations spanning 5.7981 days (2007-Dec-05.16649 to 2007-Dec-10.96463)." Diameter approximately 1.011 km. from mean, weighted H=17.7.

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 11 December '07

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

2040Noted that JPL Sentry has posted 2007 XN16 as an impact risk - see above
1637Noted that NEODyS has posted 2007 XJ16 as an impact risk - see above
Grabbed MPEC 2007-X52 - 2007 XN16 - see above
The NEOCP has become empty
1351Noted that NEODyS has updated its 2007 XB10 risk assessment - see above
Noted that NEODyS has updated its 2007 XK11 risk assessment - see above
1350Noted that JPL Sentry has posted 2007 XB10 as an impact risk - see above
Noted that JPL Sentry has removed 2007 XD10 as an impact risk - see above
Noted that NEODyS has removed 2007 XD10 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 XK11 risk assessment - see above
Grabbed MPEC 2007-X51 - Daily Orbit Update - see above