Contents  on 7 June '09


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.

Radar Astrometry  on 7 June '09

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 1903 UTC when the database was dated 7 June

NEOCP Activity  on 7 June '09

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2359 UTC). It was last noted active on June 4th.

New MPECs  on 7 June '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been seven MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-L29 - "12:39 UT" - PHAs

MPEC 2009-L28 - "12:39 UT" - Unusual Minor Planets

MPEC 2009-L27 - "12:39 UT" - Amors

MPEC 2009-L26 - "12:39 UT" - Atens and Apollos

MPEC 2009-L25 - "12:33 UT" - Distant Minor Planets

MPEC 2009-L24 - "12:31 UT" - Observable Comets

<< DOU on 7 June '09 >>  MPEC 2009-L23 - "06:07 UT" - Daily Orbit Update

Observers  on 7 June '09

Seven observing facilities appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 143651
H55Astronomical Research Obs. (ARO) in Illinois, 8 in MPEC 2009-L23 -- 2009 LE, 2009 LD, 2009 LA, 2009 KM7, 2009 KK8, 2009 KJ22, 2009 KC7, 2009 FY29
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2009-L23 -- 85989
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 1 in MPEC 2009-L23 -- 2009 LE
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 143651
932McCarthy Obs. in Connecticut, 2 in MPEC 2009-L23 -- 2009 KD5, 85989
J08Zonalunar Obs. in Spain, 2 in MPEC 2009-L23 -- 2002 LT38, 194386
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 June '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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
2009 KK8JPL Sentry14552042-210536.1e-08-4.21-4.220JPL: "Analysis based on 31 observations spanning 7.9407 days (2009-May-28.43417 to 2009-Jun-05.37484)." Diameter approximately 0.571 km. from mean, weighted H=18.9.
NEODyS14552042-205235.73e-08-4.19-4.190NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2009/05/28.435 to 2009/06/05.376."

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 7 June '09

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

1903Noted Radar Astrometry database update - see above
1455Noted that JPL Sentry has updated its 2009 KK8 risk assessment - see above
Noted that NEODyS has updated its 2009 KK8 risk assessment - see above
Grabbed MPEC 2009-L23 - Daily Orbit Update - see above
Grabbed MPEC 2009-L24 - Observable Comets - see above
Grabbed MPEC 2009-L25 - Distant Minor Planets - see above
Grabbed MPEC 2009-L26 - Atens and Apollos - see above
Grabbed MPEC 2009-L27 - Amors - see above
Grabbed MPEC 2009-L28 - Unusual Minor Planets - see above
Grabbed MPEC 2009-L29 - PHAs - see above