Contents  on 23 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 23 April '08

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 (last checked at 2342 UTC).

New MPECs  on 23 April '08

Minor Planet Electronic Circulars

As of last check at 2342 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 23 Apr. '08 >>  MPEC 2008-H21 - "06:06 UT" - Daily Orbit Update

Observers  on 23 April '08

Fourteen observing facilities appear in today's MPEC.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPEC 2008-H21 -- 2008 HE, 2008 ED8
H55Astronomical Research Obs. (ARO) in Illinois, 5 in MPEC 2008-H21 -- 2008 GP20, 2008 FW6, 2008 EB32, 2003 GW, 1999 TA10
467Auckland Obs. in New Zealand, 1 in MPEC 2008-H21 -- 2008 GD110
300Bisei Spaceguard Center in Japan, 3 in MPEC 2008-H21 -- 2008 CR116, 2008 CP116, 179806
448Desert Moon Obs. in New Mexico, 6 in MPEC 2008-H21 -- 2008 HE, 2008 GX21, 2008 GV3, 2008 GQ3, 2008 GB110, 2008 DY
H51Greiner Research Obs. (GRO) in Wisconsin, 3 in MPEC 2008-H21 -- 2007 VR183, 2005 NB7, 184266
355Hadano Obs. in Japan, 4 in MPEC 2008-H21 -- 2008 CN1, 2008 AE, 2006 DU62, 2005 BE2
379Hamamatsu-Yuto Obs. in Japan, 1 in MPEC 2008-H21 -- 2005 NB7
185Jurassien-Vicques Obs. in Switzerland, 1 in MPEC 2008-H21 -- 2008 HE
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-H21 -- 2001 XW266
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2008-H21 -- 2008 GV3, 2008 FU6, 2008 EC69, 2007 VQ4, 2005 NB7, 184266, 137170
510Siegen Obs. in Germany, 1 in MPEC 2008-H21 -- 2005 NB7
F85Tiki Obs. in Tahiti, 4 in MPEC 2008-H21 -- 2008 GX21, 2008 GQ3, 2008 GP20, 2008 GB110
B42Vitebsk Obs. in Belarus, 1 in MPEC 2008-H21 -- 2005 NB7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 April '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2342 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 HENEODyS11062053-207135.28e-10-5.27-5.560NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2008/04/18.139 to 2008/04/21.187."
JPL Sentry11052036-209151.4e-09-4.83-5.440JPL: "Analysis based on 42 observations spanning 3.0479 days (2008-Apr-18.13869 to 2008-Apr-21.18663)." Diameter approximately 0.895 km. from mean, weighted H=17.9.

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 23 April '08

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

1106Noted that NEODyS has updated its 2008 HE risk assessment - see above
1105Noted that JPL Sentry has updated its 2008 HE risk assessment - see above
Grabbed MPEC 2008-H21 - Daily Orbit Update - see above