Contents  on 29 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 29 April '08

The MPC's NEO Confirmation Page has 7 listings: 7 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had seven updated listings. All of these were "one nighters." So far The Tracking News has counted a total of ten 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 29 April '08

Minor Planet Electronic Circulars

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

MPEC 2008-H51 - "21:36 UT" - 2008 HJ3

MPEC 2008-H50 - "15:45 UT" - 2008 CS190

MPEC 2008-H49 - "11:29 UT" - 2008 HE3

<< DOU on 29 Apr. '08 >>  MPEC 2008-H48 - "06:06 UT" - Daily Orbit Update

Observers  on 29 April '08

A total of 26 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 6 in MPEC 2008-H48 -- 2008 HK, 2008 HG, 2008 FC, 2008 ED69, 2007 VK3, 2001 DF47
E18BDI Obs. in New South Wales, 1 in MPEC 2008-H48 -- 2001 QO142
A81Balzaretto Obs. in Italy, 1 in MPEC 2008-H48 -- 2008 HJ
300Bisei Spaceguard Center in Japan, 1 in MPEC 2008-H48 -- 2008 HW1
432Boambee Obs. in New South Wales, 1 in MPEC 2008-H48 -- 3691
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-H48 -- 2007 VQ4, 184266
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2008-H48 -- 1866
448Desert Moon Obs. in New Mexico, 4 in MPEC 2008-H48 -- 2008 HE, 2008 GX21, 2008 GW20, 2008 GQ3
734Farpoint Obs. in Kansas, 2 in MPECs 2008-H49 & 2008-H51 -- 2008 HJ3, 2008 HE3
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2008-H48 -- 2008 HJ
J95Great Shefford Obs. in England, 1 in MPEC 2008-H48 -- 2008 HD2
704LINEAR in New Mexico, 13 in MPEC 2008-H48 -- 2008 HK, 2007 YX1, 2006 UA, 18736, 152679, 144901, 143678, 138013, 13553, 5836, 5604, 4503, 1864
688Lowell Obs. Anderson Mesa Station in Arizona, 1 in MPEC 2008-H50 -- 2008 CS190
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2008-H49 -- 2008 HE3
J40Malaga Obs. in Spain, 2 in MPEC 2008-H48 -- 5131, 3288
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-H48 -- 2004 RH340
900Moriyama Obs. in Japan, 1 in MPEC 2008-H48 -- 2008 HW1
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2008-H48, 2008-H49 & 2008-H51 -- 2008 HJ3, 2008 HE3, 1998 KG3, 53435, 183548, 3757
675Mt. Palomar in southern California, 1 in MPEC 2008-H50 -- 2008 CS190
J93Mt. Tuffley Obs. in England, 1 in MPEC 2008-H48 -- 4954
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2008-H48 -- 2008 HJ, 2008 HG, 2008 GV3, 2008 AE, 2007 VQ4, 2005 NB7, 2004 FN32, 184266
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-H51 -- 2008 HJ3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-H48 -- 152679
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2008-H48 & 2008-H49 -- 2008 HE3, 2008 GJ110, 2008 GC110, 2008 GA4, 2008 FW6, 2008 FO, 2008 EV5, 2006 KV86, 2005 AH14
A78Stia Obs. in Italy, 2 in MPEC 2008-H48 -- 2008 GV3, 2008 FN6
198Wildberg Obs. in Germany, 1 in MPEC 2008-H51 -- 2008 HJ3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 HE3JPL Sentry17272014-202523.1e-10-4.75-4.910JPL: "Analysis based on 20 observations spanning .99800 days (2008-Apr-28.263 to 2008-Apr-29.261)." Diameter approximately 0.900 km. from mean, weighted H=17.9.
2008 HD3NEODyS12332014-2084167.94e-10-5.56-5.990NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2008/04/28.265 to 2008/04/28.471."
2008 HJNEODyS19542077-208123.76e-05-5.01-5.060NEODyS: "Based on 66 optical observations (of which 0 are rejected as outliers) from 2008/04/24.248 to 2008/04/28.590."
JPL Sentry17272077-2106201.6e-04-4.47-4.960JPL: "Analysis based on 66 observations spanning 4.3423 days (2008-Apr-24.24725 to 2008-Apr-28.58953)." Diameter approximately 0.026 km. from mean, weighted H=25.6.

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 29 April '08

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

2354Grabbed MPEC 2008-H51 - 2008 HJ3 - see above
1954Noted that NEODyS has updated its 2008 HJ risk assessment - see above
1728Grabbed MPEC 2008-H50 - 2008 CS190 - see above
1727Noted that JPL Sentry has posted 2008 HE3 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 HJ risk assessment - see above
1233Noted that NEODyS has posted 2008 HD3 as an impact risk - see above
Grabbed MPEC 2008-H48 - Daily Orbit Update - see above
Grabbed MPEC 2008-H49 - 2008 HE3 - see above