Contents  on 21 April '08


NOTE: The Tracking News and this Web site will be updating less often, and at sometimes irregular intervals, for the rest of April.

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 21 April '08

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were three listings noted earlier today.

New MPECs  on 21 April '08

Minor Planet Electronic Circulars

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

MPEC 2008-H12 - "11:08 UT" - 2008 HE

<< DOU on 21 Apr. '08 >>  MPEC 2008-H11 - "06:10 UT" - Daily Orbit Update

Observers  on 21 April '08

Twelve observing facilities appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPECs 2008-H11 & 2008-H12 -- 2008 HE, 2008 GD110
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-H12 -- 2008 HE
448Desert Moon Obs. in New Mexico, 1 in MPEC 2008-H12 -- 2008 HE
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-H12 -- 2008 HE
H51Greiner Research Obs. (GRO) in Wisconsin, 2 in MPEC 2008-H11 -- 2007 VR183, 153591
185Jurassien-Vicques Obs. in Switzerland, 2 in MPEC 2008-H11 -- 2008 GJ110, 152942
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-H12 -- 2008 HE
204Schiaparelli Obs. in Italy, 1 in MPEC 2008-H11 -- 2008 GW20
A97Stammersdorf Obs. in Austria, 1 in MPEC 2008-H11 -- 2005 NB7
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-H12 -- 2008 HE
F85Tiki Obs. in Tahiti, 2 in MPEC 2008-H11 -- 2008 GD110, 2005 WD1
198Wildberg Obs. in Germany, 1 in MPEC 2008-H12 -- 2008 HE
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 GD110JPL Sentry1312R E M O V E DJPL: Risk listing removed at 0933 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 21 April '08

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

1312Noted that JPL Sentry has removed 2008 GD110 as an impact risk - see above
Grabbed MPEC 2008-H11 - Daily Orbit Update - see above
Grabbed MPEC 2008-H12 - 2008 HE - see above
The NEOCP has become empty