Contents  on 27 December '09


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.

NEOCP Activity  on 27 December '09

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There was one listing noted earlier today.

New MPECs  on 27 December '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 27 Dec. '09 >>  MPEC 2009-Y53 - "07:13 UT" - Daily Orbit Update

Observers  on 27 December '09

Eight observing facilities appear in today's MPEC.

CodeObserver / observatory
B09Capannoli Obs. in Italy, 3 in MPEC 2009-Y53 -- 2007 MK13, 2006 UR, 2005 MC
448Desert Moon Obs. in New Mexico, 9 in MPEC 2009-Y53 -- 2009 YG, 2009 XT6, 2009 XF2, 2009 XC2, 2009 XB2, 2009 WF104, 2009 WE253, 2009 WC26, 2008 UL90
J95Great Shefford Obs. in England, 2 in MPEC 2009-Y53 -- 2009 XZ6, 2009 XV
379Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2009-Y53 -- 2009 XR2, 2006 UR, 2005 MC, 2002 XN14, 2002 WP
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2009-Y53 -- 2009 XO
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2009-Y53 -- 2009 XC2, 2005 MC
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2009-Y53 -- 2005 QL, 2002 NX, 136618, 8567
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2009-Y53 -- 2009 YU6, 2009 YQ, 2009 XO, 2009 WN105, 2009 WH106, 2009 WG106, 2009 UF2, 2008 UL90, 2007 AG, 2005 AY28, 2003 BL1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 December '09

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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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
2009 YGJPL Sentry16412033-209951.5e-06-2.26-2.510JPL: "Analysis based on 39 observations spanning 9.0920 days (2009-Dec-17.42051 to 2009-Dec-26.5125)." Diameter approximately 0.806 km. from mean, weighted H=18.1.
NEODyS16412033-208041.09e-06-2.30-2.460NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2009/12/17.421 to 2009/12/26.513."
2009 XONEODyS16412038-208628.8e-08-4.50-4.510NEODyS: "Based on 110 optical observations (of which 0 are rejected as outliers) from 2009/12/09.153 to 2009/12/27.263."

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 27 December '09

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

1641Noted that NEODyS has updated its 2009 XO risk assessment - see above
Noted that JPL Sentry has updated its 2009 YG risk assessment - see above
Noted that NEODyS has updated its 2009 YG risk assessment - see above
Grabbed MPEC 2009-Y53 - Daily Orbit Update - see above
Noted that the NEOCP has become empty