Contents  on 14 April '11

Resources:

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 14 April '11

The MPC's NEO Confirmation Page has 9 listings: 2 new, 7 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and seven updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of 22 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 14 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-G88 - "23:53 UT" - 2011 EZ78


MPEC 2011-G87 - "10:47 UT" - 2011 GM62


MPEC 2011-G86 - "10:26 UT" - 2011 GL62


MPEC 2011-G85 - "10:22 UT" - 2011 GK62


MPEC 2011-G84 - "10:05 UT" - 2011 GJ62


MPEC 2011-G83 - "09:59 UT" - 2011 GH62


<< DOU on 14 Apr. '11 >>  MPEC 2011-G82 - "07:12 UT" - Daily Orbit Update

Observers  on 14 April '11

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPECs 2011-G82, 2011-G83, 2011-G84 & 2011-G85 -- 2011 GR59, 2011 GQ59, 2011 GP59, 2011 GM44, 2011 GL44, 2011 GK62, 2011 GJ62, 2011 GH62, 2011 GG60, 2011 GC60, 2011 GC55, 2011 GB55, 2011 FY2, 2011 FG, 2011 DS9
621Bergisch Gladbach Obs. in Germany, 1 in MPEC 2011-G82 -- 2011 GS60
300Bisei Spaceguard Center in Japan, 2 in MPECs 2011-G83 & 2011-G86 -- 2011 GL62, 2011 GH62
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2011-G82, 2011-G83 & 2011-G86 -- 2011 GQ59, 2011 GL62, 2011 GH62, 2011 GF, 2011 FB29, 2004 FJ29, 2004 FG1, 136874, 1866
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2011-G86 -- 2011 GL62
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-G86 -- 2011 GL62
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-G82 -- 2011 GN44
J95Great Shefford Obs. in England, 1 in MPEC 2011-G82 -- 2011 GE62
B86Hagen Obs. in Germany, 1 in MPEC 2011-G88 -- 2011 EZ78
J37Huelva Obs. in Spain, 2 in MPEC 2011-G82 -- 2011 GP59, 1036
J28Jaen Obs. in Spain, 1 in MPEC 2011-G82 -- 85953
704LINEAR in New Mexico, 6 in MPEC 2011-G82 -- 2011 FS29, 2006 SV134, 1999 TK12, 86878, 256670, 1916
J75La Sagra Obs. in Spain, 1 in MPEC 2011-G88 -- 2011 EZ78
844Los Molinos Obs. in Uruguay, 1 in MPEC 2011-G82 -- 2011 GP59
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-G82 -- 2011 GN44
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2011-G82, 2011-G84, 2011-G85 & 2011-G88 -- 2011 GP44, 2011 GK62, 2011 GJ62, 2011 EZ78, 2004 BE11, 141874
A24New Millennium Obs. in Italy, 7 in MPEC 2011-G82 -- 2010 WQ7, 2007 EX, 96590, 251346, 18882, 137084, 2062
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-G82 -- 2011 GC55, 2010 WZ8, 2009 DV42
J52Pinsoro Obs. in Spain, 6 in MPEC 2011-G82 -- 89958, 85953, 260141, 137170, 3554, 1036
H36Sandlot Obs. in Kansas, 2 in MPEC 2011-G82 -- 2011 GL44, 2011 GB3
204Schiaparelli Obs. in Italy, 6 in MPEC 2011-G82 -- 2011 DS9, 2009 FT, 2008 FT6, 2004 FG1, 2004 EV9, 1996 RG3
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2011-G82 & 2011-G87 -- 2011 GM62, 162781
691Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2011-G82 -- 2011 GB, 2010 SO16, 2010 QE2, 1998 SR49, 250620, 7753, 4401
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2011-G82, 2011-G83 & 2011-G84 -- 2011 GS60, 2011 GO27, 2011 GJ62, 2011 GH62, 2011 GD, 2011 GB, 2011 GA, 2011 FV9, 2011 FS6, 2011 FQ29, 2011 FG41, 2011 DV, 2010 LL34, 2006 UL217
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2011 GS60JPL Sentry1403203014.7e-08-3.24-3.240JPL: "Analysis based on 29 observations spanning 4.9655 days (2011-Apr-08.40737 to 2011-Apr-13.37283)." Diameter approximately 0.640 km. from mean, weighted H=18.6.
NEODyS14032030-203013.4e-08-3.38-3.380NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2011-04-08.408 to 2011-04-13.374."
2011 GN44JPL Sentry14032018-2110311.6e-06-2.00-2.500JPL: "Analysis based on 32 observations spanning 10.237 days (2011-Apr-03.44279 to 2011-Apr-13.68006)." Diameter approximately 0.713 km. from mean, weighted H=18.4.
NEODyS14032018-2084221.14e-06-1.95-2.440NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2011-04-03.444 to 2011-04-13.681."

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 14 April '11

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

2359Grabbed MPEC 2011-G88 - 2011 EZ78 - see above
1403Noted that JPL Sentry has updated its 2011 GN44 risk assessment - see above
Noted that NEODyS has updated its 2011 GN44 risk assessment - see above
Noted that JPL Sentry has updated its 2011 GS60 risk assessment - see above
Noted that NEODyS has updated its 2011 GS60 risk assessment - see above
Grabbed MPEC 2011-G82 - Daily Orbit Update - see above
Grabbed MPEC 2011-G83 - 2011 GH62 - see above
Grabbed MPEC 2011-G84 - 2011 GJ62 - see above
Grabbed MPEC 2011-G85 - 2011 GK62 - see above
Grabbed MPEC 2011-G86 - 2011 GL62 - see above
Grabbed MPEC 2011-G87 - 2011 GM62 - see above