Contents  on 29 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 29 March '11

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and five updated listings. Of these, five were "one nighters." The Tracking News counted a total of twelve listings on the NEOCP on this day.

New MPECs  on 29 March '11

Minor Planet Electronic Circulars

There were three MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-F46 - "16:39 UT" - 2011 FQ16

<< DOU on 29 Mar. '11 >>  MPEC 2011-F45 - "07:07 UT" - Daily Orbit Update

MPEC 2011-F44 - "01:32 UT" - 2004 FJ29

Observers  on 29 March '11

Fourteen observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2011-F45 -- 2011 EW16, 2011 EE17, 2011 BX10, 2011 BB, 2010 XP51
160Castelmartini Obs. in Italy, 7 in MPEC 2011-F45 -- 2011 EW29, 2011 AO52, 2004 FU4, 2003 SC11, 22771, 144332, 4954
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2011-F45 -- 2010 UX7, 2002 SS41, 33342, 137199, 8507, 5693
807{program code "{" (31) via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2011-F45 -- 2011 FY2, 2011 DV, 2011 CH50, 2010 LF86
113Drebach Obs. in Germany, 4 in MPEC 2011-F45 -- 2011 DS9, 2010 UX7, 2005 GP21, 2003 TN1
A17Guidestar Obs. in Germany, 3 in MPEC 2011-F45 -- 2011 EK, 2007 VG184, 234341
704LINEAR in New Mexico, 7 in MPEC 2011-F45 -- 2011 EW29, 2001 QP181, 89958, 85953, 68350, 141432, 4954
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2011-F45 & 2011-F46 -- 2011 FT2, 2011 FQ16, 2006 RA55, 2001 QP181, 184266, 162433, 137199, 7753
A24New Millennium Obs. in Italy, 13 in MPEC 2011-F45 -- 2010 RO82, 2007 EX, 1999 XR35, 96590, 34613, 251346, 18882, 163081, 162421, 137084, 4660, 3122, 2062
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-F44 -- 2004 FJ29
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-F45 -- 267729, 250620
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2011-F45 -- 2011 EU29, 2011 EM51, 2011 EJ47, 2010 VN65
I28Starhoo Obs. in Massachusetts, 4 in MPEC 2011-F45 -- 40267, 144332, 4401, 1866
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2011-F45 -- 2011 DS9, 2011 BE38, 2011 AN16, 267136
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 FQ16JPL Sentry19032066-211153.1e-07-8.18-8.490JPL: "Analysis based on 16 observations spanning 1.0252 days (2011-Mar-28.31043 to 2011-Mar-29.33567)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
2011 EU29JPL Sentry1731211011.2e-05-2.53-2.531JPL: "Analysis based on 84 observations spanning 21.003 days (2011-Mar-08.20041 to 2011-Mar-29.20384)." Diameter approximately 0.370 km. from mean, weighted H=19.8.
NEODyS1621211011.2e-05-2.53-2.531NEODyS: "Based on 84 optical observations (of which 0 are rejected as outliers) from 2011-03-08.201 to 2011-03-29.205."
2011 DVJPL Sentry1621R E M O V E DJPL: Risk listing removed at 1053 UTC.

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 March '11

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

1903Noted that JPL Sentry has posted 2011 FQ16 as an impact risk - see above
1732Grabbed MPEC 2011-F46 - 2011 FQ16 - see above
1731Noted that JPL Sentry has updated its 2011 EU29 risk assessment - see above
1621Noted that JPL Sentry has removed 2011 DV as an impact risk - see above
Noted that NEODyS has updated its 2011 EU29 risk assessment - see above
Grabbed MPEC 2011-F45 - Daily Orbit Update - see above
0201Grabbed MPEC 2011-F44 - 2004 FJ29 - see above