Contents  on 18 March '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 18 March '11

The MPC's NEO Confirmation Page has 9 listings: 5 new, 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five new and four updated listings. Of these, eight 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 18 March '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 18 Mar. '11 >>  MPEC 2011-F04 - "07:08 UT" - Daily Orbit Update

Observers  on 18 March '11

Seven observers appear in today's MPEC.

CodeObserver / observatory
B17AZT-8 Evpatoria in the Ukraine, 1 in MPEC 2011-F04 -- 1864
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2011-F04 -- 2011 EW74, 2011 EW73, 2011 EO51, 2011 EM51, 2011 EL51, 2011 EK, 2011 ED41, 2011 EC41, 2011 DV, 2011 DS9, 2011 CG2, 2011 AN16, 2010 WQ7, 2010 WP8, 2006 CJ
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-F04 -- 2011 ET4, 2011 BO59, 264308, 162421
A27Eridanus Obs. in Germany, 1 in MPEC 2011-F04 -- 3122
704LINEAR in New Mexico, 2 in MPEC 2011-F04 -- 89830, 198856
213Montcabre Obs. in Spain, 1 in MPEC 2011-F04 -- 2011 EW74
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2011-F04 -- 2011 ED12, 2010 FC6, 2008 SO, 164207
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 March '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 EC41NEODyS1704R E M O V E D-
JPL Sentry1704R E M O V E DJPL: Risk listing removed at 1054 UTC.
2011 DVJPL Sentry17042095-2110155.2e-06-3.58-3.950JPL: "Analysis based on 81 observations spanning 21.934 days (2011-Feb-22.51614 to 2011-Mar-16.44975)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS1704R 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 18 March '11

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

1704Noted that JPL Sentry has updated its 2011 DV risk assessment - see above
Noted that NEODyS has removed 2011 DV as an impact risk - see above
Noted that JPL Sentry has removed 2011 EC41 as an impact risk - see above
Noted that NEODyS has removed 2011 EC41 as an impact risk - see above
Grabbed MPEC 2011-F04 - Daily Orbit Update - see above