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Contents  on 14 February '09

Resources:

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.

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NEOCP Activity  on 14 February '09

The MPC's NEO Confirmation Page has 8 listings: 1 new, 7 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and seven updated listings. Of these, two were "one nighters."

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

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New MPECs  on 14 February '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 14 Feb. '09 >>  MPEC 2009-C83 - "07:06 UT" - Daily Orbit Update

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Observers  on 14 February '09

Eleven observing facilities appear in today's MPEC.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 15 in MPEC 2009-C83 -- 2009 CZ2, 2009 CZ, 2009 CV, 2009 CT1, 2009 CS1, 2009 CR2, 2009 BT5, 2009 BP58, 2009 BK71, 2009 BJ58, 2009 BE81, 2009 AF16, 2008 YE29, 2008 XE2, 2008 UC95
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2009-C83 -- 2009 CV, 2009 CS1, 2009 BM2, 2009 BJ81, 2009 BB, 2003 YX1, 203217, 5011
J27El Guijo Obs. in Spain, 5 in MPEC 2009-C83 -- 2009 CV, 2008 EE, 2006 WZ2, 68350, 36284
J95Great Shefford Obs. in England, 3 in MPEC 2009-C83 -- 2009 CR4, 2009 CR2, 2009 CA2
B15Inastars Obs. in Germany, 2 in MPEC 2009-C83 -- 2001 LM5, 190161
695.Lawrence H. Wasserman via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2009-C83 -- 2008 EG
704LINEAR in New Mexico, 4 in MPEC 2009-C83 -- 2008 EV5, 2006 WZ2, 162385, 1864
204Schiaparelli Obs. in Italy, 3 in MPEC 2009-C83 -- 2009 CA2, 2008 EE5, 1999 CW8
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2009-C83 -- 2009 CT1, 2009 CR1, 2009 BT5, 2009 BJ58, 2009 BF81, 2009 BE2, 2009 BC58, 2008 YU30, 2008 WZ13, 2008 WK32, 2001 DR8
H83Timberlake Obs. in Virginia, 1 in MPEC 2009-C83 -- 22753
A48Verona Obs. in Italy, 4 in MPEC 2009-C83 -- 2009 CV, 2008 YE29, 2008 EE5, 2006 WZ2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

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Impact Risk Monitoring  on 14 February '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.
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
2009 CR4JPL Sentry1609R E M O V E DJPL: Risk listing removed at 0951 UTC.
2009 CR2JPL Sentry16092024-205621.2e-08-3.17-3.180JPL: "Analysis based on 25 observations spanning 10.670 days (2009-Feb-03.30293 to 2009-Feb-13.97331)." Diameter approximately 1.609 km. from mean, weighted H=16.6.
NEODyS1609202411.45e-08-3.09-3.090NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/02/03.304 to 2009/02/13.974."
2009 BF81JPL Sentry1609209112.0e-10-10.07-10.10JPL: "Analysis based on 36 observations spanning 13.059 days (2009-Jan-31.24321 to 2009-Feb-13.3018)." Diameter approximately 0.031 km. from mean, weighted H=25.2.
NEODyS1609R E M O V E D-
2009 BJ58JPL Sentry1609R E M O V E DJPL: Risk listing removed at 0953 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.

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Chronology  on 14 February '09

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

1609Noted that JPL Sentry has updated its 2009 BF81 risk assessment - see above
Noted that NEODyS has removed 2009 BF81 as an impact risk - see above
Noted that JPL Sentry has removed 2009 BJ58 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 CR2 risk assessment - see above
Noted that NEODyS has updated its 2009 CR2 risk assessment - see above
Noted that JPL Sentry has removed 2009 CR4 as an impact risk - see above
Grabbed MPEC 2009-C83 - Daily Orbit Update - see above