Contents  on 11 April '08


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 11 April '08

The MPC's NEO Confirmation Page has 5 listings: 5 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had five updated listings. All of these were "one nighters." So far The Tracking News has counted a total of eight objects listed on the NEOCP at some point today.

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

New MPECs  on 11 April '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been three MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-G67 - "11:29 UT" - 2008 GP20

MPEC 2008-G66 - "11:22 UT" - 2008 GO20

<< DOU on 11 Apr. '08 >>  MPEC 2008-G65 - "06:09 UT" - Daily Orbit Update

Observers  on 11 April '08

Eleven observing facilities appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 1 in MPEC 2008-G65 -- 2008 FN6
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2008-G65 -- 2008 GG
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2008-G65 & 2008-G67 -- 2008 GP20, 144901, 141531
J95Great Shefford Obs. in England, 1 in MPEC 2008-G65 -- 2008 GK20
474Mt. John Obs. in New Zealand, 5 in MPECs 2008-G65 & 2008-G67 -- 2008 GP20, 2008 GL2, 2007 LL, 2007 DD, 2005 BC
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2008-G65, 2008-G66 & 2008-G67 -- 2008 GP20, 2008 GO20, 2008 GK20
204Schiaparelli Obs. in Italy, 7 in MPEC 2008-G65 -- 2008 GM2, 2008 FU6, 2004 FG11, 2002 FW5, 2002 AJ129, 1999 SO5, 4954
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2008-G65 -- 2008 FT6, 2008 FJ7, 3757
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2008-G65 & 2008-G66 -- 2008 GO20, 2008 GD1
F85Tiki Obs. in Tahiti, 4 in MPEC 2008-G65 -- 2008 GL20, 2008 GF, 2008 AM33, 2005 GL9
A92Urseanu Obs. in Romania, 1 in MPEC 2008-G65 -- 11398
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 April '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.





Notes for Today's Latest Risk Assessments
2008 GO20JPL Sentry16212013-21076242.9e-06-4.13-5.010JPL: "Analysis based on 10 observations spanning 2.0911 days (2008-Apr-09.31171 to 2008-Apr-11.4028)." Diameter approximately 0.123 km. from mean, weighted H=22.2.
2008 GM2JPL Sentry15082063-2108522.0e-05-6.72-7.390JPL: "Analysis based on 40 observations spanning 2.7703 days (2008-Apr-06.41278 to 2008-Apr-09.18308)." Diameter approximately 0.008 km. from mean, weighted H=28.3.
NEODyS15082063-2089102.4e-06-7.54-7.770NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2008/04/06.414 to 2008/04/09.184."
2008 GD1JPL Sentry1508R E M O V E DJPL: Risk listing removed at 1054 UTC.
NEODyS1507R E M O V E D-
2008 GGNEODyS1507R E M O V E D-
JPL Sentry0501R E M O V E DJPL: Risk listing removed at 0103 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.

Chronology  on 11 April '08

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

1621Noted that JPL Sentry has posted 2008 GO20 as an impact risk - see above
1508Noted that JPL Sentry has removed 2008 GD1 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 GM2 risk assessment - see above
Noted that NEODyS has updated its 2008 GM2 risk assessment - see above
Grabbed MPEC 2008-G65 - Daily Orbit Update - see above
Grabbed MPEC 2008-G67 - 2008 GP20 - see above
1507Noted that NEODyS has removed 2008 GD1 as an impact risk - see above
Noted that NEODyS has removed 2008 GG as an impact risk - see above
Grabbed MPEC 2008-G66 - 2008 GO20 - see above
0501Noted that JPL Sentry has removed 2008 GG as an impact risk - see above