Contents  on 11 December '08


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate 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 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.

Radar Astrometry  on 11 December '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data addition noted at 2118 UTC when the database was dated 11 Dec.

NEOCP Activity  on 11 December '08

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 (checked at 2358 UTC). It was last noted active on December 9th.

New MPECs  on 11 December '08

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been seven MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-X78 - "20:14 UT" - PHAs

MPEC 2008-X77 - "20:14 UT" - Unusual Minor Planets

MPEC 2008-X76 - "20:14 UT" - Amors

MPEC 2008-X75 - "20:14 UT" - Atens and Apollos

MPEC 2008-X74 - "20:11 UT" - Distant Minor Planets

MPEC 2008-X73 - "20:05 UT" - Observable Comets

<< DOU on 11 Dec. '08 >>  MPEC 2008-X72 - "07:08 UT" - Daily Orbit Update

Observers  on 11 December '08

Nine observing facilities appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 4179
448Desert Moon Obs. in New Mexico, 3 in MPEC 2008-X72 -- 2008 WQ63, 2008 UC, 2008 SH82
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2008-X72 -- 2008 XC1
252Goldstone DSS-13 34m antenna in southern California, 1 in radar -- 4179
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4179
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-X72 -- 2008 UE7, 2006 VB14
704LINEAR in New Mexico, 3 in MPEC 2008-X72 -- 2008 WL60, 2006 SZ217, 68350
204Schiaparelli Obs. in Italy, 7 in MPEC 2008-X72 -- 2008 XM, 2008 XC1, 2008 WY94, 2008 WG14, 2008 VU4, 2008 UZ94, 2005 WD1
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2008-X72 -- 2008 WD14, 2008 EV5, 8035
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 December '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
Note that the time horizon for JPL is 100 years from today and for NEODyS is 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
2008 XC1JPL Sentry14032085-208823.6e-07-5.97-6.060JPL: "Analysis based on 108 observations spanning 6.6124 days (2008-Dec-03.36799 to 2008-Dec-09.98036)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
NEODyS14032085-208823.85e-07-5.93-6.030NEODyS: "Based on 109 optical observations (of which 1 are rejected as outliers) from 2008/12/03.369 to 2008/12/09.981."
2008 WY94JPL Sentry14032061-2076172.5e-04-4.20-4.250JPL: "Analysis based on 32 observations spanning 7.2084 days (2008-Nov-29.54021 to 2008-Dec-06.748633)." Diameter approximately 0.025 km. from mean, weighted H=25.6.
NEODyS14032061-2089511.68e-04-4.37-4.470NEODyS: "Based on 34 optical observations (of which 3 are rejected as outliers) from 2008/11/29.541 to 2008/12/06.749."

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 '08

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

2118Grabbed MPEC 2008-X73 - Observable Comets - see above
Grabbed MPEC 2008-X74 - Distant Minor Planets - see above
Grabbed MPEC 2008-X75 - Atens and Apollos - see above
Grabbed MPEC 2008-X76 - Amors - see above
Grabbed MPEC 2008-X77 - Unusual Minor Planets - see above
Grabbed MPEC 2008-X78 - PHAs - see above
Noted Radar Astrometry database addition - see above
1403Noted that JPL Sentry has updated its 2008 WY94 risk assessment - see above
Noted that NEODyS has updated its 2008 WY94 risk assessment - see above
Noted that JPL Sentry has updated its 2008 XC1 risk assessment - see above
Noted that NEODyS has updated its 2008 XC1 risk assessment - see above
Grabbed MPEC 2008-X72 - Daily Orbit Update - see above