Contents  on 15 May '11


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 15 May '11

The MPC's NEO Confirmation Page has 10 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had ten objects listed. Of these, three were "one nighters." So far The Tracking News has counted a total of sixteen listings on the NEOCP 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 15 May '11

Minor Planet Electronic Circulars

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

<< DOU on 15 May '11 >>  MPEC 2011-J53 - "07:09 UT" - Daily Orbit Update

Observers  on 15 May '11

Nine observers appear in today's MPEC.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2011-J53 -- 7358
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2011-J53 -- 2002 SS41, 3554
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2011-J53 -- 2011 JR13, 2011 HT, 2011 HP, 2011 HO5, 2011 HL7, 2011 HH, 2011 GQ65
448Desert Moon Obs. in New Mexico, 3 in MPEC 2011-J53 -- 2011 HS, 2011 GQ65, 153002
185Jurassien-Vicques Obs. in Switzerland, 1 in MPEC 2011-J53 -- 162463
704LINEAR in New Mexico, 1 in MPEC 2011-J53 -- 137170
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-J53 -- 53789
A24New Millennium Obs. in Italy, 14 in MPEC 2011-J53 -- 2011 HT, 2011 HQ, 2011 HO, 2011 GQ65, 2011 EZ78, 2011 AO52, 2008 GV20, 2007 PP6, 37336, 267494, 163250, 3103, 1866, 1036
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-J53 -- 85804
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 May '11

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
2011 HO5JPL Sentry15392079-209031.0e-06-5.95-5.970JPL: "Analysis based on 59 observations spanning 16.826 days (2011-Apr-27.39956 to 2011-May-14.22514)." Diameter approximately 0.048 km. from mean, weighted H=24.2.
NEODyS15392090-209011.2e-06-5.90-5.90NEODyS: "Based on 59 optical observations (of which 0 are rejected as outliers) from 2011-04-27.400 to 2011-05-14.226."

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 15 May '11

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

1539Noted that JPL Sentry has updated its 2011 HO5 risk assessment - see above
Noted that NEODyS has updated its 2011 HO5 risk assessment - see above
Grabbed MPEC 2011-J53 - Daily Orbit Update - see above