SOHO's 1,500th comet, discovered June 25th 
by Rob Matson. Image credit: SOHO.

Amateur observer Rob Matson's 76th SOHO comet discovery on June 25th has been announced as the 1,500th comet discovered with the solar physics spacecraft. See news at SOHO and ESA. Image credit: SOHO.

Contents  on 29 June '08


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 June '08

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and five updated listings. Of these, two were "one nighters." The Tracking News counted a total of seven objects listed on the NEOCP at some point on this day.

New MPECs  on 29 June '08

Minor Planet Electronic Circulars

There were two MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 29 June '08 >>  MPEC 2008-M44 - "06:06 UT" - Daily Orbit Update

MPEC 2008-M43 - "02:13 UT" - Comet C/2007 M1 (McNaught)

Observers  on 29 June '08

Nineteen observing facilities appeared in this day's MPECs.

CodeObserver / observatory
B37Ametlla del Valles Obs. in Spain, 3 in MPEC 2008-M44 -- 2008 JT35, 8567, 7889
H55Astronomical Research Obs. (ARO) in Illinois, 15 in MPEC 2008-M44 -- 2008 LQ16, 2008 LH2, 2008 LA, 2008 KZ5, 2008 KQ, 2008 KD6, 2008 JV19, 2008 JT35, 2008 JR26, 2008 JG, 2008 HE66, 2008 GA110, 2008 EX84, 2002 XY4, 2001 RB18
B09Capannoli Obs. in Italy, 1 in MPEC 2008-M44 -- 2008 JT35
J27El Guijo Obs. in Spain, 2 in MPEC 2008-M44 -- 2005 TU45, 35107
151Eschenberg Obs. in Switzerland, 5 in MPEC 2008-M44 -- 2008 JT35, 2008 HS3, 2007 LL, 2005 TU45, 2005 NB7
J95Great Shefford Obs. in England, 2 in MPEC 2008-M44 -- 2008 LV16, 2008 KD6
A17Guidestar Obs. in Germany, 2 in MPEC 2008-M44 -- 2008 LW8, 2008 LV16
B19Iluro Obs. in Spain, 4 in MPEC 2008-M44 -- 2008 JT35, 11398, 8567, 1917
J59Linceo Obs. in Spain, 1 in MPEC 2008-M44 -- 2008 JT35
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2008-M44 -- 2008 JT35, 2005 TU45
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2008-M44 -- 2008 KD6, 2008 HS3
A13Naef Obs. in Switzerland, 2 in MPEC 2008-M44 -- 2008 KD6, 162186
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2008-M44 -- 2008 JT35, 2007 LL
941Pla D'Arguines Obs. in Spain, 1 in MPEC 2008-M43 -- C/2007 M1
E12Siding Spring Survey (SSS) in New South Wales, 10 in MPEC 2008-M44 -- 2008 LW16, 2007 XJ20, 2006 WZ2, 1996 SK, 86829, 36236, 18736, 143678, 4954, 1980
H85Silver Spring Obs. in Maryland, 1 in MPEC 2008-M44 -- 162980
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2008-M44 -- 163335
A48Verona Obs. in Italy, 3 in MPEC 2008-M44 -- 2008 JT35, 2007 LL, 2005 TU45
198Wildberg Obs. in Germany, 2 in MPEC 2008-M44 -- 2008 JT35, 7889
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 June '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 LANEODyS15022058-207041.02e-04-3.13-3.130NEODyS: "Based on 82 optical observations (of which 1 are rejected as outliers) from 2008/06/01.170 to 2008/06/27.116."
JPL Sentry15012058-209441.0e-04-3.12-3.120JPL: "Analysis based on 81 observations spanning 25.946 days (2008-Jun-01.16922 to 2008-Jun-27.115408)." Diameter approximately 0.081 km. from mean, weighted H=23.1.

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 June '08

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

1502Noted that NEODyS has updated its 2008 LA risk assessment - see above
1501Noted that JPL Sentry has updated its 2008 LA risk assessment - see above
Grabbed MPEC 2008-M44 - Daily Orbit Update - see above
0454Grabbed MPEC 2008-M43 - Comet C/2007 M1 (McNaught) - see above