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Contents  on 20 February '08

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 20 February '08

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two updated listings. Of these, one was a "one nighter."

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 20 February '08

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 20 Feb. '08 >>  MPEC 2008-D17 - "07:09 UT" - Daily Orbit Update

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Observers  on 20 February '08

Six observing facilities appear in today's MPEC.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2008-D17 -- 2008 CH, 2008 CC71, 16657, 137158
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2008-D17 -- 2005 EK70
B57Laietania Obs. in Spain, 1 in MPEC 2008-D17 -- 1036
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2008-D17 -- 2008 CR116, 2008 CN1, 2008 CL1, 2008 AE, 2007 TU24, 2007 TG8, 11398
E12Siding Spring Survey in New South Wales, 1 in MPEC 2008-D17 -- 2007 PF2
510Siegen Obs. in Germany, 5 in MPEC 2008-D17 -- 2007 DA, 153591, 4450, 1685, 1036

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Impact Risk Monitoring  on 20 February '08

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 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.
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
2008 DBNEODyS18362046-2090292.89e-05-4.92-4.980NEODyS: "Based on 35 optical observations (of which 2 are rejected as outliers) from 2008/02/18.243 to 2008/02/19.410."
2008 CC71NEODyS17302034-2089281.05e-04-3.98-4.130NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2008/02/09.397 to 2008/02/19.487."
JPL Sentry16032033-2082271.1e-04-3.97-4.130JPL: "Analysis based on 29 observations spanning 10.090 days (2008-Feb-09.39625 to 2008-Feb-19.48606)." Diameter approximately 0.038 km. from mean, weighted H=24.8.

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 20 February '08

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

1835Noted that NEODyS has posted 2008 DB as an impact risk - see above
1730Noted that NEODyS has updated its 2008 CC71 risk assessment - see above
1603Noted that JPL Sentry has updated its 2008 CC71 risk assessment - see above
Grabbed MPEC 2008-D17 - Daily Orbit Update - see above