Contents  on 30 April '08


NOTE: The Tracking News and this Web site will be updating less often, and at sometimes irregular intervals, until around May 4th.

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 30 April '08

The MPC's NEO Confirmation Page has 10 listings: 3 new, 7 updated

When last checked at 2345 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and seven updated listings. Of these, eight were "one nighters." So far The Tracking News has counted a total of sixteen 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 30 April '08

Minor Planet Electronic Circulars

As of last check at 2345 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-H55 - "14:20 UT" - 2008 HS3

MPEC 2008-H54 - "14:16 UT" - 2008 HR3

MPEC 2008-H53 - "14:13 UT" - 2008 HQ3

<< DOU on 30 Apr. '08 >>  MPEC 2008-H52 - "06:06 UT" - Daily Orbit Update

Observers  on 30 April '08

Nineteen observing facilities appear in today's MPECs.

CodeObserver / observatory
A44Altschwendt Obs. in Austria, 1 in MPEC 2008-H52 -- 2008 FN6
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2008-H52 -- 2001 SK169
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2008-H52 -- 2008 HJ3
B09Capannoli Obs. in Italy, 4 in MPEC 2008-H52 -- 2008 GV3, 2004 FN32, 1998 KG3, 1866
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2008-H52 & 2008-H55 -- 2008 HS3, 2004 FN32, 2003 GW, 68348, 53789, 35107, 22099, 9400, 6456, 5836, 1866
808El Leoncito Obs. in Argentina, 7 in MPEC 2008-H52 -- 2007 VR183, 21088, 153591, 5836, 4503, 3691, 1980
734Farpoint Obs. in Kansas, 1 in MPEC 2008-H55 -- 2008 HS3
J95Great Shefford Obs. in England, 1 in MPEC 2008-H52 -- 2008 HJ3
H51Greiner Research Obs. (GRO) in Wisconsin, 6 in MPEC 2008-H52 -- 2008 HK, 2008 FN6, 2007 VQ4, 2004 FN32, 2003 GW, 2001 QO142
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2008-H52 -- 2005 NB7, 35107
E19Kingsgrove Obs. in New South Wales, 3 in MPEC 2008-H52 -- 2001 HY7, 1998 SF35, 68278
704LINEAR in New Mexico, 4 in MPEC 2008-H52 -- 2001 HY7, 86667, 184990, 5626
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2008-H52, 2008-H53 & 2008-H54 -- 2008 HR3, 2008 HQ3, 2008 HG, 2008 GH110, 2005 SM25, 2005 GE59, 2001 XW266, 2001 HY7, 2000 JJ5, 53409
A13Naef Obs. in Switzerland, 3 in MPEC 2008-H52 -- 2008 HD3, 2008 FN, 184266
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2008-H52 -- 137170
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2008-H52 -- 2008 HG, 2008 ED69, 2008 EC69, 2008 DE, 2008 CP23, 2007 VQ4, 2005 NB7, 2003 GW, 2002 JC, 53319, 35107, 137170, 11398
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2008-H52 -- 2008 GW20, 2007 VY7, 2007 MR
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2008-H52 -- 2008 HF2, 2008 GF, 2008 GD1, 2008 GA4, 2008 DW22, 2006 KV86, 2002 AF29
198Wildberg Obs. in Germany, 3 in MPEC 2008-H52 -- 2005 NB7, 2003 AD1, 2000 ER70
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 April '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2345 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 HR3JPL Sentry23452022-2106192.1e-07-6.36-6.810JPL: "Analysis based on 12 observations spanning 1.0021 days (2008-Apr-29.27703 to 2008-Apr-30.2791)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
2008 HE3NEODyS23462013-202846.79e-11-5.61-5.720NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/04/28.264 to 2008/04/29.262."
2008 HD3NEODyS10452017-2090321.66e-08-4.41-4.840NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/04/28.265 to 2008/04/29.981."
JPL Sentry10442020-2104271.5e-08-4.52-4.940JPL: "Analysis based on 20 observations spanning 1.7154 days (2008-Apr-28.26455 to 2008-Apr-29.97995)." Diameter approximately 0.420 km. from mean, weighted H=19.5.

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 30 April '08

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

2345Noted that NEODyS has posted 2008 HE3 as an impact risk - see above
Noted that JPL Sentry has posted 2008 HR3 as an impact risk - see above
Grabbed MPEC 2008-H53 - 2008 HQ3 - see above
Grabbed MPEC 2008-H54 - 2008 HR3 - see above
Grabbed MPEC 2008-H55 - 2008 HS3 - see above
1045Noted that NEODyS has updated its 2008 HD3 risk assessment - see above
1044Noted that JPL Sentry has posted 2008 HD3 as an impact risk - see above
Grabbed MPEC 2008-H52 - Daily Orbit Update - see above