Contents  on 23 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 23 May '11

The MPC's NEO Confirmation Page has 36 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 36 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 48 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 23 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 23 May '11 >>  MPEC 2011-K17 - "07:06 UT" - Daily Orbit Update

Observers  on 23 May '11

Twelve observers appear in today's MPEC.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2011-K17 -- 2011 EZ78
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2011-K17 -- 2011 KE, 2011 JE1, 2011 HT, 2011 HQ, 2011 HP, 2011 HL7, 2011 HD63, 2011 HB53, 2011 GQ65, 2011 GD68, 2011 FZ2, 2011 FR17, 2011 AN16, 2010 TU5, 2008 GV20
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-K17 -- 2011 HS, 2011 HR, 263976, 155341
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-K17 -- 2011 KE
J95Great Shefford Obs. in England, 1 in MPEC 2011-K17 -- 2011 KE
704LINEAR in New Mexico, 5 in MPEC 2011-K17 -- 68350, 275545, 271480, 21374, 154453
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-K17 -- 2011 BY24
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPEC 2011-K17 -- 2010 TV149, 2008 TR10, 2008 GE110, 144922, 4179, 3122
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2011-K17 -- 2011 JU2, 2011 JU10, 2011 HS60, 2011 HG, 2011 HF, 1997 WB21
6734Mike Hicks via Table Mtn. Obs. in southern California, 1 in MPEC 2011-K17 -- 2011 KE
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-K17 -- 138359
198Wildberg Obs. in Germany, 1 in MPEC 2011-K17 -- 2011 KB
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 BY24JPL Sentry1453R E M O V E DJPL: Risk listing removed at 1049 UTC.
NEODyS1453R 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 23 May '11

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

1453Noted that JPL Sentry has removed 2011 BY24 as an impact risk - see above
Noted that NEODyS has removed 2011 BY24 as an impact risk - see above
Grabbed MPEC 2011-K17 - Daily Orbit Update - see above