Contents  on 29 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 29 April '10

The MPC's NEO Confirmation Page has 12 listings: 10 new, 2 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten new and two updated listings. Of these, three 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 29 April '10

Minor Planet Electronic Circulars

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

MPEC 2010-H72 - "23:10 UT" - 2004 QD17

MPEC 2010-H71 - "19:31 UT" - 2006 JT

<< DOU on 29 Apr. '10 >>  MPEC 2010-H70 - "06:08 UT" - Daily Orbit Update

Observers  on 29 April '10

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2010-H70 -- 2010 HV20, 2010 HS20, 2010 GZ6, 2010 GU6, 2010 GU21, 2010 GA34, 2010 FQ, 2010 DB34, 2010 CN44, 2009 UY19, 2006 CX10
511Haute Provence Obs. in Germany, 2 in MPEC 2010-H70 -- 2010 GT7, 2010 EC135
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-H72 -- 2004 QD17
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2010-H70 -- 2010 FF10
A13Naef Obs. in Switzerland, 4 in MPEC 2010-H70 -- 2010 FF10, 2010 CL18, 2009 SO103, 184990
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2010-H70 -- 2010 GU21, 2009 UY19, 2006 CX10
473Remanzacco Obs. in Italy, 2 in MPEC 2010-H70 -- 2010 GU21, 2010 GE35
204Schiaparelli Obs. in Italy, 8 in MPEC 2010-H70 -- 2010 HF, 2010 HC, 2010 GP33, 2010 GL65, 2010 GL23, 2006 XK2, 2005 ED318, 1999 HW1
510Siegen Obs. in Germany, 2 in MPEC 2010-H70 -- 2005 YU55, 433
926Tenagra II Obs. in Arizona, 2 in MPEC 2010-H70 -- 2010 HV20, 2009 VO24
H53Thompsonville Obs. in Illinois, 2 in MPEC 2010-H70 -- 218863, 3554
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2010-H70 -- 2010 GU21
A48Verona Obs. in Italy, 3 in MPEC 2010-H70 -- 2010 GU21, 2010 GS7, 2006 CX10
C51WISE in Earth polar orbit, 2 in MPECs 2010-H70 & 2010-H71 -- 2009 XD, 2006 JT
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 HS20JPL Sentry13432030-206743.6e-06-4.35-4.390JPL: "Analysis based on 33 observations spanning 7.9410 days (2010-Apr-20.41913 to 2010-Apr-28.360122)." Diameter approximately 0.076 km. from mean, weighted H=23.2.
NEODyS13432030-206723.37e-06-4.38-4.410NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2010/04/20.420 to 2010/04/28.361."

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 April '10

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

2359Grabbed MPEC 2010-H72 - 2004 QD17 - see above
2109Grabbed MPEC 2010-H71 - 2006 JT - see above
1343Noted that JPL Sentry has updated its 2010 HS20 risk assessment - see above
Noted that NEODyS has updated its 2010 HS20 risk assessment - see above
Grabbed MPEC 2010-H70 - Daily Orbit Update - see above