Contents  on 1 April '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 1 April '11

The MPC's NEO Confirmation Page has 18 listings: 6 new, 12 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six new and twelve updated listings. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 25 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 1 April '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-G07 - "16:28 UT" - 2011 FT29

MPEC 2011-G06 - "16:23 UT" - 2011 FS29

MPEC 2011-G05 - "16:13 UT" - 2011 FR29

MPEC 2011-G04 - "16:08 UT" - 2011 FQ29

MPEC 2011-G03 - "16:02 UT" - 2011 FP29

MPEC 2011-G02 - "15:50 UT" - 2011 ED78

<< DOU on 1 Apr. '11 >>  MPEC 2011-G01 - "07:08 UT" - Daily Orbit Update

Observers  on 1 April '11

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPECs 2011-G01 & 2011-G05 -- 2011 FZ2, 2011 FT2, 2011 FR29, 2011 EW29, 2011 EO51, 2011 EE17, 2011 BK24, 2011 AF37
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2011-G01, 2011-G02 & 2011-G07 -- 2011 FV9, 2011 FT29, 2011 FQ17, 2011 EW74, 2011 ED78, 2011 DL19
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2011-G01 -- 2004 RD252
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2011-G06 -- 2011 FS29
A27Eridanus Obs. in Germany, 1 in MPEC 2011-G01 -- 3122
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-G02 -- 2011 ED78
J28Jaen Obs. in Spain, 3 in MPEC 2011-G01 -- 2004 FG1, 23187, 22771
704LINEAR in New Mexico, 4 in MPECs 2011-G01 & 2011-G06 -- 2011 FS29, 85953, 164400, 102873
J87La Canada Obs. in Spain, 1 in MPEC 2011-G01 -- 2011 DS9
900Moriyama Obs. in Japan, 1 in MPEC 2011-G06 -- 2011 FS29
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-G02, 2011-G03, 2011-G04 & 2011-G07 -- 2011 FT29, 2011 FQ29, 2011 FP29, 2011 ED78
A24New Millennium Obs. in Italy, 3 in MPEC 2011-G01 -- 2010 UX7, 2002 TD60, 4401
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2011-G01, 2011-G02, 2011-G05 & 2011-G07 -- 2011 FY22, 2011 FT29, 2011 FR29, 2011 EW73, 2011 ED78
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-G06 -- 2011 FS29
434San Benedetto Po Obs. in Italy, 2 in MPEC 2011-G01 -- 36284, 3554
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-G01 -- 89958
291Spacewatch 1.8m telescope in Arizona, 3 in MPECs 2011-G01, 2011-G03 & 2011-G05 -- 2011 FR29, 2011 FP29, 2011 EB12
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-G05 -- 2011 FR29
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-G06 -- 2011 FS29
C51WISE in Earth polar orbit, 2 in MPEC 2011-G01 -- 2010 AJ30, 2010 AH30
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 April '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 FA23NEODyS16402051-206332.43e-06-7.43-7.460NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-03-30.250 to 2011-03-31.434."
2011 FY22NEODyS1640R E M O V E D-
JPL Sentry1640R E M O V E DJPL: Risk listing removed at 1048 UTC.
2004 FU162JPL Sentry04042011-21107875.6e-05-4.73-5.050JPL: "Analysis based on 4 observations spanning .03055 days (2004-Mar-31.27744 to 2004-Mar-31.30799)." Diameter approximately 0.006 km. from mean, weighted H=29.0.

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 1 April '11

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

1640Noted that NEODyS has posted 2011 FA23 as an impact risk - see above
Noted that JPL Sentry has removed 2011 FY22 as an impact risk - see above
Noted that NEODyS has removed 2011 FY22 as an impact risk - see above
Grabbed MPEC 2011-G01 - Daily Orbit Update - see above
Grabbed MPEC 2011-G02 - 2011 ED78 - see above
Grabbed MPEC 2011-G03 - 2011 FP29 - see above
Grabbed MPEC 2011-G04 - 2011 FQ29 - see above
Grabbed MPEC 2011-G05 - 2011 FR29 - see above
Grabbed MPEC 2011-G06 - 2011 FS29 - see above
Grabbed MPEC 2011-G07 - 2011 FT29 - see above
0404Noted that JPL Sentry has updated its 2004 FU162 risk assessment - see above