Contents  on 31 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 31 March '11

The MPC's NEO Confirmation Page has 7 listings: 1 new, 6 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and six updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of thirteen 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 31 March '11

Minor Planet Electronic Circulars

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

MPEC 2011-F60 - "20:24 UT" - 2011 FC29

MPEC 2011-F59 - "19:56 UT" - 2011 FB29

MPEC 2011-F58 - "15:13 UT" - 1988 TA

MPEC 2011-F57 - "10:46 UT" - 2011 FA23

MPEC 2011-F56 - "09:22 UT" - 2011 FZ22

<< DOU on 31 Mar. '11 >>  MPEC 2011-F55 - "07:08 UT" - Daily Orbit Update

MPEC 2011-F54 - "06:42 UT" - 2011 FY22

Observers  on 31 March '11

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2011-F58 & 2011-F59 -- 2011 FB29, 1988 TA
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-F59 & 2011-F60 -- 2011 FC29, 2011 FB29
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2011-F55 & 2011-F59 -- 2011 FB29, 2009 DV42, 2003 SC11, 263976, 164222, 136874
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPECs 2011-F54, 2011-F55, 2011-F56, 2011-F59 & 2011-F60 -- 2011 FZ22, 2011 FY22, 2011 FC29, 2011 FB29, 2011 ED41
G58Chabot Obs. in northern California, 1 in MPEC 2011-F55 -- 2011 DU
704LINEAR in New Mexico, 1 in MPEC 2011-F56 -- 2011 FZ22
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2011-F54, 2011-F55, 2011-F57, 2011-F59 & 2011-F60 -- 2011 FY22, 2011 FC29, 2011 FB29, 2011 FA23, 3908
A24New Millennium Obs. in Italy, 7 in MPEC 2011-F55 -- 2011 CY46, 99935, 267940, 267136, 7480, 5646, 3554
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-F58 -- 1988 TA
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2011-F55 -- 2008 FT6, 2001 QP181
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2011-F55 -- 2009 KT21
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-F56 -- 2011 FZ22
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2011-F55, 2011-F56, 2011-F58 & 2011-F59 -- 2011 FZ22, 2011 FQ6, 2011 FB29, 2011 EM51, 2010 XZ67, 2010 LN14, 1988 TA
I28Starhoo Obs. in Massachusetts, 1 in MPEC 2011-F55 -- 141525
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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 FA23JPL Sentry15072025-210263.5e-06-7.28-7.420JPL: "Analysis based on 21 observations spanning 1.1846 days (2011-Mar-30.24897 to 2011-Mar-31.43355)." Diameter approximately 0.006 km. from mean, weighted H=28.9.
2011 FY22JPL Sentry15072026-2110133.8e-08-6.62-6.940JPL: "Analysis based on 14 observations spanning .94352 days (2011-Mar-30.24781 to 2011-Mar-31.19133)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
NEODyS15072026-209093.9e-08-6.77-7.080NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-03-30.249 to 2011-03-31.192."
2011 FQ6JPL Sentry15072053-2103283.6e-05-5.90-5.980JPL: "Analysis based on 24 observations spanning 3.1004 days (2011-Mar-27.26132 to 2011-Mar-30.36173)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
NEODyS15072049-2090413.84e-05-5.87-5.930NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-03-27.262 to 2011-03-30.362."

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 31 March '11

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

2200Grabbed MPEC 2011-F60 - 2011 FC29 - see above
2001Grabbed MPEC 2011-F59 - 2011 FB29 - see above
1714Grabbed MPEC 2011-F58 - 1988 TA - see above
1507Noted that JPL Sentry has posted 2011 FA23 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 FQ6 risk assessment - see above
Noted that NEODyS has updated its 2011 FQ6 risk assessment - see above
Noted that JPL Sentry has posted 2011 FY22 as an impact risk - see above
Noted that NEODyS has posted 2011 FY22 as an impact risk - see above
Grabbed MPEC 2011-F54 - 2011 FY22 - see above
Grabbed MPEC 2011-F55 - Daily Orbit Update - see above
Grabbed MPEC 2011-F56 - 2011 FZ22 - see above
Grabbed MPEC 2011-F57 - 2011 FA23 - see above