Contents  on 2 May '11


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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 2 May '11

The Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) was not checked on this day.

New MPECs  on 2 May '11

Minor Planet Electronic Circulars

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

MPEC 2011-J06 - "14:49 UT" - 2011 HO53

MPEC 2011-J05 - "14:25 UT" - 2011 JA

<< DOU on 2 May '11 >>  MPEC 2011-J04 - "07:07 UT" - Daily Orbit Update

MPEC 2011-J03 - "01:02 UT" - 2011 HB53

Observers  on 2 May '11

A total of 24 observers appeared in this day's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2011-J05 -- 2011 JA
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-J04 -- 2011 HR
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-J05 -- 2011 JA
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-J05 -- 2011 JA
160Castelmartini Obs. in Italy, 1 in MPEC 2011-J04 -- 267494
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2011-J04 & 2011-J05 -- 2011 JA, 2001 QP181, 250614, 184990, 141531
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2011-J04 -- 2011 HS4, 2011 HO5, 2011 HN5, 2011 HL7, 2011 HH
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2011-J05 -- 2011 JA
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-J03 & 2011-J06 -- 2011 HO53, 2011 HB53
J95Great Shefford Obs. in England, 2 in MPECs 2011-J03 & 2011-J04 -- 2011 HD24, 2011 HB53
704LINEAR in New Mexico, 1 in MPEC 2011-J04 -- 2004 FU4
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2011-J04 -- 2010 TU5, 2007 TB23, 2000 JE5
A99Monte Baldo Obs. in Italy, 1 in MPEC 2011-J05 -- 2011 JA
474Mt. John Obs. in New Zealand, 1 in MPEC 2011-J04 -- 2011 HN5
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPEC 2011-J04 -- 2011 GA, 2008 GV20, 2007 GD49, 54686, 1864
A13Naef Obs. in Switzerland, 1 in MPEC 2011-J04 -- 2010 VN65
A24New Millennium Obs. in Italy, 8 in MPECs 2011-J04 & 2011-J05 -- 2011 JA, 2011 GF, 2011 FS29, 2004 FU4, 267729, 163696, 141531, 141525
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2011-J03, 2011-J04 & 2011-J06 -- 2011 HO53, 2011 HB53, 2010 UP, 2005 WD1, 11311
204Schiaparelli Obs. in Italy, 17 in MPECs 2011-J04 & 2011-J05 -- 2011 JA, 2011 HP, 2011 HD24, 2011 GM62, 2011 GL62, 2011 GH62, 2011 GF, 2011 GD68, 2011 GC60, 2011 EZ78, 2011 CH71, 2008 RJ1, 2007 TB23, 2007 PP6, 2004 HC, 2004 FG1, 274138
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2011-J04 -- 2011 GH62, 1999 TK12, 172722
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2011-J04 -- 2011 HS4, 2011 GJ62, 2011 FG41
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-J05 -- 2011 JA
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-J06 -- 2011 HO53
718Wiggins Obs. in Utah, 1 in MPEC 2011-J05 -- 2011 JA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 HB53NEODyS13402023-2090982.45e-07-3.27-4.480NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2011-04-29.265 to 2011-05-01.933."
JPL Sentry03152027-21101354.0e-07-3.23-4.390JPL: "Analysis based on 15 observations spanning 2.6680 days (2011-Apr-29.26387 to 2011-May-01.93191)." Diameter approximately 0.530 km. from mean, weighted H=19.0.
2011 HO5JPL Sentry13402024-21103286.6e-05-3.67-4.050JPL: "Analysis based on 18 observations spanning 3.8975 days (2011-Apr-27.39956 to 2011-May-01.29709)." Diameter approximately 0.057 km. from mean, weighted H=23.9.
NEODyS13402024-20901355.18e-05-3.80-4.160NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2011-04-27.400 to 2011-05-01.298."

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 2 May '11

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

1509Grabbed MPEC 2011-J05 - 2011 JA - see above
Grabbed MPEC 2011-J06 - 2011 HO53 - see above
1340Noted that NEODyS has posted 2011 HB53 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 HO5 risk assessment - see above
Noted that NEODyS has updated its 2011 HO5 risk assessment - see above
Grabbed MPEC 2011-J04 - Daily Orbit Update - see above
0315Noted that JPL Sentry has posted 2011 HB53 as an impact risk - see above
0105Grabbed MPEC 2011-J03 - 2011 HB53 - see above