Contents  on 12 December '07

Resources:

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 12 December '07

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (last checked at 2354 UTC).

New MPECs  on 12 December '07

Minor Planet Electronic Circulars

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


<< DOU on 12 Dec. '07 >>  MPEC 2007-X53 - "07:11 UT" - Daily Orbit Update

Observers  on 12 December '07

Eight observing facilities appear in today's MPEC.

CodeObserver / observatory
J95Great Shefford Obs. in England, 6 in MPEC 2007-X53 -- 2007 XZ9, 2007 XT3, 2007 XP3, 2007 XN16, 2007 XA10, 2007 WY3
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2007-X53 -- 2007 PU11, 2003 BH84
951Highworth Obs. in England, 1 in MPEC 2007-X53 -- 66272
987Isle of Man Obs. on the Isle of Man, 2 in MPEC 2007-X53 -- 162273, 162142
J66Kinver Obs. in England, 2 in MPEC 2007-X53 -- 2007 TG15, 2007 SE11
A24New Millennium Obs. in Italy, 15 in MPEC 2007-X53 -- 2007 TG15, 2007 SE11, 2003 BH84, 1999 AQ10, 1996 TY11, 86324, 85804, 21374, 20826, 18736, 170903, 143678, 137084, 3553, 1580
B49Paus Obs. in Spain, 2 in MPEC 2007-X53 -- 170903, 138947
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2007-X53 -- 2007 XH16, 2007 WW4, 85275, 66146

Impact Risk Monitoring  on 12 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2007 XN16JPL Sentry1356R E M O V E DJPL: Risk listing removed at 1126 UTC.
2007 XZ9JPL Sentry13562056-208931.4e-06-5.80-6.040JPL: "Analysis based on 35 observations spanning 7.8651 days (2007-Dec-04.19408 to 2007-Dec-12.05916)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
NEODyS13562047-208951.54e-06-5.75-6.060NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2007/12/04.195 to 2007/12/12.060."
2007 XP3JPL Sentry13562038-209732.7e-08-3.79-3.980JPL: "Analysis based on 16 observations spanning 7.6952 days (2007-Dec-04.38257 to 2007-Dec-12.07781)." Diameter approximately 0.690 km. from mean, weighted H=18.4.
NEODyS13562038-205931.43e-07-3.17-3.260NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2007/12/04.383 to 2007/12/12.079."
2007 WY3JPL Sentry1356R E M O V E DJPL: Risk listing removed at 1250 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 12 December '07

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

1356Noted that JPL Sentry has removed 2007 WY3 as an impact risk - see above
Noted that JPL Sentry has removed 2007 XN16 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 XP3 risk assessment - see above
Noted that NEODyS has updated its 2007 XP3 risk assessment - see above
Noted that JPL Sentry has updated its 2007 XZ9 risk assessment - see above
Noted that NEODyS has updated its 2007 XZ9 risk assessment - see above
Grabbed MPEC 2007-X53 - Daily Orbit Update - see above