Contents  on 8 June '08


NOTE: These news pages will update less often and at irregular intervals through June 12th.

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 8 June '08

The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and two updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of four 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 8 June '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-L32 - "21:48 UT" - Comet C/2008 J4 (McNaught)

<< DOU on 8 June '08 >>  MPEC 2008-L31 - "06:08 UT" - Daily Orbit Update

Observers  on 8 June '08

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H077300 Obs. in New Mexico, 1 in MPEC 2008-L31 -- 1627
349Ageo Obs. in Japan, 1 in MPEC 2008-L32 -- C/2008 J4
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-L31 -- 5626, 3288
448Desert Moon Obs. in New Mexico, 4 in MPEC 2008-L31 -- 2008 KZ5, 2008 KN11, 2008 KE6, 2008 GX
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2008-L31 -- 2007 LL
715Jornada Obs. in New Mexico, 1 in MPEC 2008-L31 -- 2008 KQ
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2008-L31 -- 2008 LD, 2008 HU4
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-L31 -- 2008 JP24
J93Mt. Tuffley Obs. in England, 3 in MPEC 2008-L31 -- 7092, 3288, 1980
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2008-L31 -- 2008 LG2, 2008 KW2, 2008 JP14, 2008 HS3, 2007 VQ4, 2007 LL, 2005 NB7, 2000 AD205, 35107, 137170
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2008-L31 -- 2001 QC34, 1996 FR3, 170891, 163000, 162723
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2008-L31 -- 2008 JW19, 2008 JT19
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-L31 -- 2008 KV2
F85Tiki Obs. in Tahiti, 2 in MPECs 2008-L31 & 2008-L32 -- 2008 LG2, C/2008 J4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 June '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 LG2JPL Sentry11502038-2107211.3e-04-4.29-4.310JPL: "Analysis based on 33 observations spanning 4.0989 days (2008-Jun-03.31737 to 2008-Jun-07.41625)." Diameter approximately 0.029 km. from mean, weighted H=25.4.
NEODyS11482038-2084191.23e-04-4.29-4.300NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2008/06/03.318 to 2008/06/07.417."
2008 LDJPL Sentry11502049-2108534.3e-05-6.63-7.460JPL: "Analysis based on 24 observations spanning 5.0627 days (2008-Jun-02.29145 to 2008-Jun-07.35417)." Diameter approximately 0.006 km. from mean, weighted H=28.9.
NEODyS11502055-2090252.43e-05-6.83-7.440NEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2008/06/02.292 to 2008/06/07.355."
2008 KN11JPL Sentry11502037-204656.8e-07-5.08-5.390JPL: "Analysis based on 65 observations spanning 8.0279 days (2008-May-30.33435 to 2008-Jun-07.36226)." Diameter approximately 0.077 km. from mean, weighted H=23.2.
NEODyS11492030-204666.93e-07-5.06-5.370NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2008/05/30.335 to 2008/06/07.363."
2008 HU4NEODyS21482073-208943.32e-06-7.44-7.720NEODyS: "Based on 70 optical observations (of which 0 are rejected as outliers) from 2008/04/30.325 to 2008/06/07.271."
JPL Sentry1150R E M O V E DJPL: Risk listing removed at 0856 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 8 June '08

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

2354Grabbed MPEC 2008-L32 - Comet C/2008 J4 (McNaught) - see above
2148Noted that NEODyS has updated its 2008 HU4 risk assessment - see above
1150Noted that JPL Sentry has removed 2008 HU4 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 KN11 risk assessment - see above
Noted that JPL Sentry has updated its 2008 LD risk assessment - see above
Noted that NEODyS has updated its 2008 LD risk assessment - see above
Noted that JPL Sentry has updated its 2008 LG2 risk assessment - see above
1149Noted that NEODyS has updated its 2008 KN11 risk assessment - see above
Grabbed MPEC 2008-L31 - Daily Orbit Update - see above
1148Noted that NEODyS has updated its 2008 LG2 risk assessment - see above