Contents  on 27 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 27 March '11

The MPC's NEO Confirmation Page has 10 listings: 1 new, 9 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and nine updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of nineteen 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 27 March '11

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 2011-F33 - "15:18 UT" - 2011 FZ2

MPEC 2011-F32 - "15:05 UT" - 2011 FY2

<< DOU on 27 Mar. '11 >>  MPEC 2011-F31 - "07:07 UT" - Daily Orbit Update

Observers  on 27 March '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-F32 -- 2011 FY2
160Castelmartini Obs. in Italy, 5 in MPEC 2011-F31 -- 2011 EW29, 163250, 137170, 8566, 3554
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2011-F31 & 2011-F32 -- 2011 FY2, 2011 BE38, 2011 AN16, 2004 EK1, 2003 SC11, 2002 TD60, 265196, 22771, 204232, 8507, 3199
8070R. Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2011-F32 & 2011-F33 -- 2011 FZ2, 2011 FY2
807{Dan Reichart via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-F31 -- 2010 TV149
B83Gieres Obs. in France, 1 in MPEC 2011-F31 -- 3554
704LINEAR in New Mexico, 7 in MPEC 2011-F31 -- 2011 FK1, 2009 DV42, 267136, 24445, 228368, 22771, 3554
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2011-F31 & 2011-F33 -- 2011 FZ2, 2011 EW29, 2011 AH37, 1996 RG3, 163373
A13Naef Obs. in Switzerland, 1 in MPEC 2011-F31 -- 2010 UX7
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-F31 -- 2011 FK1, 2011 EX29, 2011 ED12
H06*Rolando Ligustri in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-F32 -- 2011 FY2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-F31 -- 2011 FG
204Schiaparelli Obs. in Italy, 17 in MPEC 2011-F31 -- 2011 EY11, 2011 EX4, 2011 ET4, 2011 EM11, 2011 ED12, 2011 EC12, 2011 EC, 2011 EB12, 2011 DW, 2011 DS9, 2009 FY4, 2009 EN2, 2005 EY169, 2004 EK1, 267337, 267136, 267131
E12Siding Spring Survey (SSS) in New South Wales, 9 in MPECs 2011-F31 & 2011-F32 -- 2011 FY2, 2011 FK1, 2011 ET4, 2009 KT21, 2008 EY5, 2008 EE, 2003 YO3, 2001 CA32, 248590
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-F31 -- 152941, 5626
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2011-F31 & 2011-F33 -- 2011 FZ2, 2011 EX29, 2011 EW73, 2011 EW4, 2011 EU29, 2011 ET74, 2011 EL51, 2011 EG17, 2011 EB7, 2011 DV, 2005 YP180, 2005 UY5, 2005 RN33, 2003 BX33
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-F33 -- 2011 FZ2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 27 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 EU29NEODyS16482087-211041.2e-05-2.52-2.521NEODyS: "Based on 75 optical observations (of which 0 are rejected as outliers) from 2011-03-08.201 to 2011-03-27.158."
2011 DVJPL Sentry16482108-211021.3e-09-7.20-7.260JPL: "Analysis based on 89 observations spanning 31.969 days (2011-Feb-22.51614 to 2011-Mar-26.48539)." Diameter approximately 0.270 km. from mean, weighted H=20.5.

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 27 March '11

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

1648Noted that JPL Sentry has updated its 2011 DV risk assessment - see above
Noted that NEODyS has updated its 2011 EU29 risk assessment - see above
Grabbed MPEC 2011-F31 - Daily Orbit Update - see above
Grabbed MPEC 2011-F32 - 2011 FY2 - see above
Grabbed MPEC 2011-F33 - 2011 FZ2 - see above