Contents  on 28 April '10


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 28 April '10

The MPC's NEO Confirmation Page has 5 listings: 3 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and two updated listings. Of these, two were "one nighters."

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 28 April '10

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 28 Apr. '10 >>  MPEC 2010-H69 - "06:08 UT" - Daily Orbit Update

MPEC 2010-H68 - "01:29 UT" - Comet C/2009 UG89 (Lemmon)

Observers  on 28 April '10

Ten observing facilities appear in today's MPECs.

CodeObserver / observatory
J18Churchstoke Obs. in Wales, 1 in MPEC 2010-H69 -- 2010 GU21
F655David Asher in Northern Ireland via Faulkes Telescope North in Hawaii, 2 in MPEC 2010-H69 -- 2009 UN3, 1998 OK1
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 1 in MPEC 2010-H69 -- 2010 HV20
J95Great Shefford Obs. in England, 2 in MPEC 2010-H69 -- 2010 HV20, 2010 GE35
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2010-H69 -- 2010 FD, 2008 HD3
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2010-H69 -- 90367, 27346
A13Naef Obs. in Switzerland, 2 in MPEC 2010-H69 -- 20790, 152931
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2010-H68 -- C/2009 UG89
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2010-H68 -- C/2009 UG89
926Tenagra II Obs. in Arizona, 2 in MPECs 2010-H68 & 2010-H69 -- 2010 HV20, C/2009 UG89
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2010-H69 -- 2010 GU21
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 April '10

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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special 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
2010 FDJPL Sentry13512085-210429.1e-07-6.77-6.810JPL: "Analysis based on 42 observations spanning 30.106 days (2010-Mar-16.34477 to 2010-Apr-15.45123)." Diameter approximately 0.021 km. from mean, weighted H=26.0.
NEODyS1351R E M O V E D-

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 28 April '10

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

1351Noted that JPL Sentry has updated its 2010 FD risk assessment - see above
Noted that NEODyS has removed 2010 FD as an impact risk - see above
Grabbed MPEC 2010-H69 - Daily Orbit Update - see above
0302Grabbed MPEC 2010-H68 - Comet C/2009 UG89 (Lemmon) - see above