Contents  on 23 April '10


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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 23 April '10

The MPC's NEO Confirmation Page has 12 listings: 6 new, 6 updated

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

New MPECs  on 23 April '10

Minor Planet Electronic Circulars

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

MPEC 2010-H46 - "20:03 UT" - 2010 HP20

MPEC 2010-H45 - "19:49 UT" - 2010 HO20

MPEC 2010-H44 - "14:10 UT" - 2010 EN65, 2010 EQ65, 2010 ET65

<< DOU on 23 Apr. '10 >>  MPEC 2010-H43 - "06:11 UT" - Daily Orbit Update

Observers  on 23 April '10

Ten observing facilities appeared in this day's MPECs.

CodeObserver / observatory
A17Guidestar Obs. in Germany, 5 in MPEC 2010-H43 -- 2010 GU21, 2010 GR7, 2010 GE35, 2010 FA81, 2004 JX20
511Haute Provence Obs. in Germany, 6 in MPEC 2010-H43 -- 2010 GU21, 2010 FO92, 2010 EC135, 2010 CL18, 2010 CH18, 2007 TD71
704LINEAR in New Mexico, 3 in MPEC 2010-H43 -- 2010 GA24, 2001 HC, 215588
688Lowell Obs. Anderson Mesa Station in Arizona, 3 in MPEC 2010-H44 -- 2010 ET65, 2010 EQ65, 2010 EN65
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-H43 -- 2005 YU55
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2010-H46 -- 2010 HP20
2614Andrew Lowe in Alberta using the Palomar Digitized Sky Survey in southern California, 1 in MPEC 2010-H43 -- 2008 SC85
H23Pear Tree Obs. in Florida, 2 in MPEC 2010-H43 -- 68216, 3671
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2010-H43 -- 2010 GT6, 2008 HY37
C51WISE in Earth polar orbit, 1 in MPEC 2010-H45 -- 2010 HO20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 HP20JPL Sentry22092021-20795395.0e-05-6.02-7.780JPL: "Analysis based on 12 observations spanning .04822 days (2010-Apr-20.44799 to 2010-Apr-20.49621)." Diameter approximately 0.008 km. from mean, weighted H=28.3.

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 23 April '10

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

2209Noted that JPL Sentry has posted 2010 HP20 as an impact risk - see above
2107Grabbed MPEC 2010-H46 - 2010 HP20 - see above
2001Grabbed MPEC 2010-H45 - 2010 HO20 - see above
1500Grabbed MPEC 2010-H44 - 2010 EN65, 2010 EQ65, 2010 ET65 - see above
1400Grabbed MPEC 2010-H43 - Daily Orbit Update - see above