Contents  on 10 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 10 April '11

The MPC's NEO Confirmation Page has 7 listings: 7 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of nine 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 10 April '11

Minor Planet Electronic Circulars

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


MPEC 2011-G67 - "10:44 UT" - 2011 GG60


<< DOU on 10 Apr. '11 >>  MPEC 2011-G66 - "07:11 UT" - Daily Orbit Update


MPEC 2011-G65 - "02:05 UT" - 2011 GD60

Observers  on 10 April '11

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2011-G65, 2011-G66 & 2011-G67 -- 2011 GM44, 2011 GK44, 2011 GG60, 2011 GE3, 2011 GD60, 2011 GA3, 2011 FY2, 2011 DS9, 2010 XJ
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-G65 -- 2011 GD60
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-G67 -- 2011 GG60
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-G65 -- 2011 GD60
8070David Jewitt via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-G66 -- 2010 SO16
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2011-G66 -- 2011 GP59, 2011 GP44, 2011 GN44, 2011 GD, 2011 GB55, 2011 GB3, 2011 GA55, 2011 GA, 2006 UQ217, 1998 UN1
J18Churchstoke Obs. in Wales, 2 in MPECs 2011-G65 & 2011-G66 -- 2011 GD60, 2010 XJ
176Consell Obs. in Spain, 1 in MPEC 2011-G65 -- 2011 GD60
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2011-G67 -- 2011 GG60
151Eschenberg Obs. in Switzerland, 1 in MPEC 2011-G66 -- 2004 FG1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-G65 -- 2011 GD60
157Frasso Sabino Obs. in Italy, 4 in MPEC 2011-G66 -- 2011 GL44, 2011 GF, 2011 GC55, 2011 FS29
J95Great Shefford Obs. in England, 3 in MPECs 2011-G65, 2011-G66 & 2011-G67 -- 2011 GP59, 2011 GG60, 2011 GD60
A17Guidestar Obs. in Germany, 4 in MPEC 2011-G66 -- 2011 GR59, 2011 GC55, 2011 FB29, 2009 RB4
B86Hagen Obs. in Germany, 1 in MPEC 2011-G65 -- 2011 GD60
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2011-G66 -- 2008 FU6, 3554
704LINEAR in New Mexico, 10 in MPEC 2011-G66 -- 2011 GP59, 2002 TD60, 40267, 265196, 263976, 163696, 163250, 154035, 141525, 8566
844Los Molinos Obs. in Uruguay, 1 in MPEC 2011-G67 -- 2011 GG60
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-G65 & 2011-G66 -- 2011 GP59, 2011 GD60
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-G66 -- 2005 WD1
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2011-G66 -- 2011 AF37, 2010 WD9, 2008 AE, 2003 MT2, 190166, 172034, 11054
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2011-G66 -- 2011 GP59, 2011 AO52, 2008 FU6, 2001 QP181
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2011-G66 -- 256670, 4401
H06|H. Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-G66 -- 2011 GP59
473Remanzacco Obs. in Italy, 1 in MPEC 2011-G65 -- 2011 GD60
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2011-G66 -- 2011 GC
233San Vito Obs. in Italy, 2 in MPEC 2011-G66 -- 260141, 23187
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-G65 -- 2011 GD60
204Schiaparelli Obs. in Italy, 2 in MPECs 2011-G65 & 2011-G67 -- 2011 GG60, 2011 GD60
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2011-G66 & 2011-G67 -- 2011 GM44, 2011 GG60, 2011 GA55
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-G66 -- 2007 HF44
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-G65 -- 2011 GD60
C51WISE in Earth polar orbit, 3 in MPEC 2011-G66 -- 2009 UX17, 2009 ST103, 86326
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 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 GR59JPL Sentry1602R E M O V E DJPL: Risk listing removed at 1139 UTC.
2011 GP59NEODyS1602R E M O V E D-
2011 GA55NEODyS1602R E M O V E D-
JPL Sentry1602R E M O V E DJPL: Risk listing removed at 1136 UTC.
2011 GN44JPL Sentry16022025-2110674.1e-07-2.62-3.320JPL: "Analysis based on 16 observations spanning 5.8406 days (2011-Apr-03.44279 to 2011-Apr-09.28339)." Diameter approximately 0.707 km. from mean, weighted H=18.4.
NEODyS16022018-2088542.86e-07-2.56-3.320NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-04-03.444 to 2011-04-09.284."
2011 GANEODyS1602R E M O V E D-
JPL Sentry1602R E M O V E DJPL: Risk listing removed at 1051 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 10 April '11

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

1602Noted that JPL Sentry has removed 2011 GA as an impact risk - see above
Noted that NEODyS has removed 2011 GA as an impact risk - see above
Noted that JPL Sentry has removed 2011 GA55 as an impact risk - see above
Noted that NEODyS has removed 2011 GA55 as an impact risk - see above
Noted 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 NEODyS has removed 2011 GP59 as an impact risk - see above
Noted that JPL Sentry has removed 2011 GR59 as an impact risk - see above
Grabbed MPEC 2011-G66 - Daily Orbit Update - see above
Grabbed MPEC 2011-G67 - 2011 GG60 - see above
0221Grabbed MPEC 2011-G65 - 2011 GD60 - see above