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Contents  on 20 January '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 January '08

The MPC's NEO Confirmation Page has 10 listings: 2 new, 8 updated

When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and eight updated listings. Of these, three 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 20 January '08

Minor Planet Electronic Circulars

As of last check at 2356 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 20 Jan. '08 >>  MPEC 2008-B21 - "07:08 UT" - Daily Orbit Update

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Observers  on 20 January '08

Ten observing facilities appear in today's MPEC.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 5 in MPEC 2008-B21 -- 2008 AF4, 2008 AE, 2005 TU45, 2000 CH59, 3288
448Desert Moon Obs. in New Mexico, 6 in MPEC 2008-B21 -- 2007 YU56, 2007 XQ3, 2007 VW137, 2007 LS, 2005 NB7, 171839
H51Greiner Research Obs. in Wisconsin, 8 in MPEC 2008-B21 -- 2007 VQ4, 2007 TG8, 2005 TU45, 2005 EK70, 2003 BT35, 2000 CH59, 11398, 7977
B19Iluro Obs. in Spain, 3 in MPEC 2008-B21 -- 2008 AF4, 2005 TU45, 11398
704LINEAR in New Mexico, 3 in MPEC 2008-B21 -- 2003 BT35, 53319, 3691
G96Mt. Lemmon Survey (MLS) in Arizona, 14 in MPEC 2008-B21 -- 2008 AU28, 2008 AG33, 2008 AG1, 2008 AD, 2008 AB31, 2007 YQ56, 2007 PS9, 2005 SF, 65706, 39565, 38091, 144922, 138175, 2202
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2008-B21 -- 2005 XD1, 85804, 66272, 170903, 153591, 143678, 137084
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2008-B21 -- 68063, 4450
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2008-B21 -- 2008 AT28, 2008 AN33, 2008 AG33, 2007 YM56, 2006 SV19, 2003 DN4
H50Univ. of Central Arkansas Obs. (UCA Obs.) in Arkansas, 3 in MPEC 2008-B21 -- 99935, 68359, 4954

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Impact Risk Monitoring  on 20 January '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2356 UTC)
See the CRT page for a list of all objects rated recently as risks.
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 AN33JPL Sentry0235R E M O V E DJPL: Risk listing removed at 0226 UTC.
2008 AK33NEODyS15492010-202441.29e-08-4.48-4.680NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2008/01/15.081 to 2008/01/18.183."
2008 AG33JPL Sentry1549R E M O V E DJPL #2 for the day: Risk listing removed at 1112 UTC.
NEODyS1549R E M O V E D
2008 AF4NEODyS15492078-2090111.66e-05-2.46-2.481NEODyS: "Based on 122 optical observations (of which 3 are rejected as outliers) from 2008/01/10.397 to 2008/01/20.044. NOTE: The Virtual Impactor in 2089/01/09.478 in the table above is rated as Torino Scale 1."
2007 YQ56JPL Sentry0532R E M O V E DJPL: Risk listing removed at 0358 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 20 January '08

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

1549Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
Noted that JPL Sentry has removed 2008 AG33 as an impact risk - see above
Noted that NEODyS has removed 2008 AG33 as an impact risk - see above
Noted that NEODyS has updated its 2008 AK33 risk assessment - see above
Grabbed MPEC 2008-B21 - Daily Orbit Update - see above
0532Noted that JPL Sentry has removed 2007 YQ56 as an impact risk - see above
0235Noted that JPL Sentry has removed 2008 AN33 as an impact risk - see above
0129Noted that JPL Sentry has updated its 2008 AG33 risk assessment - see above