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Contents  on 24 January '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 24 January '09

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 yesterday.

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New MPECs  on 24 January '09

Minor Planet Electronic Circulars

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


MPEC 2009-B50 - "17:43 UT" - Comet P/2009 B1 (Boattini)


<< DOU on 24 Jan. '09 >>  MPEC 2009-B49 - "07:05 UT" - Daily Orbit Update

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Observers  on 24 January '09

Nine observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 7 in MPEC 2009-B49 -- 2009 BB, 2009 AN, 2009 AD16, 2008 YE29, 2008 SH82, 2008 NB, 2008 EV5
B75Betelgeuse Station in Italy, 1 in MPEC 2009-B49 -- 4179
703Catalina Sky Survey in Arizona, 1 in MPEC 2009-B50 -- P/2009 B1
B60Deep Sky Obs. in Germany, 1 in MPEC 2009-B49 -- 1916
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2009-B50 -- P/2009 B1
F654Jim Bedient in Hawaii via Faulkes Telescope North in Hawaii, 3 in MPEC 2009-B49 -- 2009 BL2, 2006 AS2, 2000 EW70
J95Great Shefford Obs. in England, 6 in MPECs 2009-B49 & 2009-B50 -- 2009 BW2, 2009 BU5, 2009 BR5, 2009 BO5, 2009 BD, P/2009 B1
J47Nazaret Obs. in Spain, 1 in MPEC 2009-B50 -- P/2009 B1
D29Purple Mtn. Obs. XuYi Station (XuYi Sta.) in China, 3 in MPEC 2009-B49 -- 2001 BJ16, 198752, 4179
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 24 January '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 some objects with impact solutions beyond 100 years.
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 BU5JPL Sentry1550R E M O V E DJPL: Risk listing removed at 0953 UTC.
NEODyS1550R E M O V E D-
2009 BR5JPL Sentry15502021-2108673.2e-06-3.80-4.360JPL: "Analysis based on 12 observations spanning 3.5424 days (2009-Jan-20.45513 to 2009-Jan-23.99752)." Diameter approximately 0.129 km. from mean, weighted H=22.1.
NEODyS15502025-2085862.8e-06-3.87-4.420NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2009/01/20.456 to 2009/01/23.998."
2009 BDJPL Sentry15502054-2097295.4e-04-5.19-5.660JPL: "Analysis based on 115 observations spanning 7.5242 days (2009-Jan-16.27641 to 2009-Jan-23.800569)." Diameter approximately 0.007 km. from mean, weighted H=28.4.
NEODyS15502053-2090335.11e-04-5.20-5.660NEODyS: "Based on 116 optical observations (of which 1 are rejected as outliers) from 2009/01/16.277 to 2009/01/23.801."

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 24 January '09

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

1759Grabbed MPEC 2009-B50 - Comet P/2009 B1 (Boattini) - see above
1550Noted that JPL Sentry has updated its 2009 BD risk assessment - see above
Noted that NEODyS has updated its 2009 BD risk assessment - see above
Noted that JPL Sentry has updated its 2009 BR5 risk assessment - see above
Noted that NEODyS has updated its 2009 BR5 risk assessment - see above
Noted that JPL Sentry has removed 2009 BU5 as an impact risk - see above
Noted that NEODyS has removed 2009 BU5 as an impact risk - see above
Grabbed MPEC 2009-B49 - Daily Orbit Update - see above