Contents  on 11 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 11 April '11

The MPC's NEO Confirmation Page has 4 listings: 1 new, 3 updated

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and three updated listings. Of these, two 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 11 April '11

Minor Planet Electronic Circulars

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


<< DOU on 11 Apr. '11 >>  MPEC 2011-G69 - "07:11 UT" - Daily Orbit Update


MPEC 2011-G68 - "02:41 UT" - 2011 GS60

Observers  on 11 April '11

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2011-G69 -- 2011 GZ54, 2011 GR59, 2011 GQ59, 2011 GP44, 2011 GJ44, 2011 GE3, 2011 GD3, 2011 FY2, 2011 FS29, 2011 ET29, 2011 DU, 2011 AN16, 2007 DU103, 1999 TK12
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-G69 -- 2011 GG60
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-G69 -- 141531
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-G69 -- 2011 GG60
157Frasso Sabino Obs. in Italy, 3 in MPEC 2011-G69 -- 2011 FB29, 2011 EM51, 2004 GP
J95Great Shefford Obs. in England, 5 in MPEC 2011-G69 -- 2011 GQ59, 2011 GK44, 2011 GE, 2011 GC60, 2011 FT53
A17Guidestar Obs. in Germany, 1 in MPEC 2011-G69 -- 2011 GQ59
J28Jaen Obs. in Spain, 1 in MPEC 2011-G69 -- 252793
704LINEAR in New Mexico, 2 in MPECs 2011-G68 & 2011-G69 -- 2011 GS60, 2011 GQ59
844Los Molinos Obs. in Uruguay, 3 in MPEC 2011-G69 -- 2008 FU6, 89958, 4401
130Lumezzane Obs. in Italy, 7 in MPEC 2011-G69 -- 2011 AN16, 2008 SO, 2004 FU4, 85953, 23187, 163412, 4401
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-G68 & 2011-G69 -- 2011 GS60, 2011 GN44
A99Monte Baldo Obs. in Italy, 1 in MPEC 2011-G69 -- 2011 GG60
I89Nerpio Obs. in Italy, 1 in MPEC 2011-G68 -- 2011 GS60
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 3 in MPEC 2011-G69 -- 2011 DS9, 2011 AN16, 23187
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPEC 2011-G69 -- 2011 GP44, 2011 GG60, 2011 BE38
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-G69 -- 2011 GG60
233San Vito Obs. in Italy, 2 in MPEC 2011-G69 -- 260141, 23187
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-G69 -- 2011 GJ3
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-G68 -- 2011 GS60
291Spacewatch 1.8m telescope in Arizona, 5 in MPEC 2011-G69 -- 2011 GJ3, 2011 GF3, 2011 FR29, 2011 ED78, 2011 DU
A48Verona Obs. in Italy, 2 in MPEC 2011-G69 -- 2008 FU6, 2004 FG1
198Wildberg Obs. in Germany, 1 in MPEC 2011-G68 -- 2011 GS60
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 GS60NEODyS14512030-203431.72e-08-3.61-3.720NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2011-04-08.408 to 2011-04-11.026."
JPL Sentry0506203011.6e-08-3.64-3.640JPL: "Analysis based on 17 observations spanning 2.6183 days (2011-Apr-08.40737 to 2011-Apr-11.02569)." Diameter approximately 0.680 km. from mean, weighted H=18.5.
2011 GN44JPL Sentry14512018-2110571.3e-06-1.77-1.900JPL: "Analysis based on 20 observations spanning 7.7980 days (2011-Apr-03.44279 to 2011-Apr-11.2408)." Diameter approximately 0.716 km. from mean, weighted H=18.4.
NEODyS14512018-2088388.52e-07-1.78-1.890NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2011-04-03.444 to 2011-04-11.242."

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 11 April '11

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

1451Noted 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 posted 2011 GS60 as an impact risk - see above
Grabbed MPEC 2011-G69 - Daily Orbit Update - see above
0506Noted that JPL Sentry has posted 2011 GS60 as an impact risk - see above
0346Grabbed MPEC 2011-G68 - 2011 GS60 - see above