Contents  on 27 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 27 April '10

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

When last checked 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." So far The Tracking News has counted a total of eleven listings on the NEOCP at some point today.

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 27 April '10

Minor Planet Electronic Circulars

There have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2010-H67 - "10:42 UT" - 2009 HC82

<< DOU on 27 Apr. '10 >>  MPEC 2010-H66 - "06:11 UT" - Daily Orbit Update

Observers  on 27 April '10

Eight observing facilities appear in today's MPECs.

CodeObserver / observatory
448Desert Moon Obs. in New Mexico, 4 in MPEC 2010-H66 -- 2010 GH30, 2010 DE, 2009 XE11, 153842
J95Great Shefford Obs. in England, 4 in MPEC 2010-H66 -- 2010 HW20, 2010 HV20, 2010 GE35, 234061
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2010-H66 -- 2010 GU21, 2001 HC
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-H67 -- 2009 HC82
G96Mt. Lemmon Survey (MLS) in Arizona, 15 in MPEC 2010-H66 -- 2010 HS20, 2010 GW62, 2010 GU6, 2010 GT7, 2010 GS7, 2010 GR75, 2010 GO33, 2010 GL65, 2010 GA34, 2010 FY80, 2010 FL, 2010 FC81, 2010 DE, 2009 XE11, 234061
H11Rodeo Obs. in New Mexico, 1 in MPEC 2010-H66 -- 2010 FA81
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2010-H66 -- 2010 GU21
G72University Hills Obs. in southern California, 1 in MPEC 2010-H66 -- 2010 GU21
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 April '10

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. 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 HV20JPL Sentry1348R E M O V E DJPL: Risk listing removed at 0952 UTC.
2010 HS20JPL Sentry13482030-206742.1e-06-4.60-4.630JPL: "Analysis based on 30 observations spanning 6.0705 days (2010-Apr-20.41913 to 2010-Apr-26.48965)." Diameter approximately 0.075 km. from mean, weighted H=23.3.
NEODyS13482030-206731.94e-06-4.63-4.660NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2010/04/20.420 to 2010/04/26.490."

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 27 April '10

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

1348Noted that JPL Sentry has updated its 2010 HS20 risk assessment - see above
Noted that NEODyS has updated its 2010 HS20 risk assessment - see above
Noted that JPL Sentry has removed 2010 HV20 as an impact risk - see above
Grabbed MPEC 2010-H66 - Daily Orbit Update - see above
Grabbed MPEC 2010-H67 - 2009 HC82 - see above