Contents  on 27 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 27 April '08

The MPC's NEO Confirmation Page has 11 listings: 1 new, 10 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and ten updated listings. Of these, five 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.

New MPECs  on 27 April '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 27 Apr. '08 >>  MPEC 2008-H33 - "06:06 UT" - Daily Orbit Update

Observers  on 27 April '08

Eighteen observing facilities appear in today's MPEC.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 4 in MPEC 2008-H33 -- 2008 HK, 2008 HJ, 2008 HG, 2008 CP23
H55Astronomical Research Obs. (ARO) in Illinois, 5 in MPEC 2008-H33 -- 2008 HE, 2008 GG2, 2008 GE, 2008 EM85, 2008 DJ5
B09Capannoli Obs. in Italy, 5 in MPEC 2008-H33 -- 184266, 154988, 3288, 1864, 1685
703Catalina Sky Survey in Arizona, 1 in MPEC 2008-H33 -- 68278
448Desert Moon Obs. in New Mexico, 6 in MPEC 2008-H33 -- 2008 GX, 2008 GP20, 2008 GB110, 2008 DY, 2008 CZ118, 2005 LG8
113Drebach Obs. in Germany, 4 in MPEC 2008-H33 -- 2008 HG, 2008 FN6, 2004 FN32, 2003 GW
151Eschenberg Obs. in Switzerland, 6 in MPEC 2008-H33 -- 2008 HK, 2008 EM9, 2008 DE, 2005 NB7, 2004 FN32, 2001 HY7
B21Gaisberg Obs. in Austria, 1 in MPEC 2008-H33 -- 2008 FN6
B19Iluro Obs. in Spain, 5 in MPEC 2008-H33 -- 53319, 35107, 137170, 11398, 102873
185Jurassien-Vicques Obs. in Switzerland, 2 in MPEC 2008-H33 -- 2008 HK, 2008 HJ
704LINEAR in New Mexico, 7 in MPEC 2008-H33 -- 2008 HK, 2008 HJ, 2008 HG, 85236, 53319, 5604, 3288
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-H33 -- 2005 TU45
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-H33 -- 136874
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2008-H33 -- 2008 DE, 2005 NB7, 35107, 184266
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-H33 -- 152679
291Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2008-H33 -- 2008 HJ, 2008 HH, 2008 GU3, 2008 GF, 2008 GA4, 2008 FW5, 2008 EE, 2008 DJ5, 2007 MR, 2005 SM25, 2004 LE
F85Tiki Obs. in Tahiti, 2 in MPEC 2008-H33 -- 2008 HJ, 2008 HG
198Wildberg Obs. in Germany, 3 in MPEC 2008-H33 -- 2008 FU6, 2008 EC69, 1999 FA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 HLNEODyS12352025-207584.68e-09-5.58-6.060NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/04/25.462 to 2008/04/26.480."
2008 HJNEODyS12352077-209031.77e-05-5.28-5.360NEODyS: "Based on 39 optical observations (of which 0 are rejected as outliers) from 2008/04/24.248 to 2008/04/27.018."
JPL Sentry12342077-2106271.2e-04-4.57-5.250JPL: "Analysis based on 39 observations spanning 2.7704 days (2008-Apr-24.24725 to 2008-Apr-27.017697)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2008 HHJPL Sentry1234R E M O V E DJPL: Risk listing removed at 0947 UTC.
NEODyS1234R E M O V E D-

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 27 April '08

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

1235Noted that NEODyS has updated its 2008 HJ risk assessment - see above
Grabbed MPEC 2008-H33 - Daily Orbit Update - see above
1234Noted that JPL Sentry has removed 2008 HH as an impact risk - see above
Noted that NEODyS has removed 2008 HH as an impact risk - see above
Noted that JPL Sentry has updated its 2008 HJ risk assessment - see above
Noted that NEODyS has posted 2008 HL as an impact risk - see above