Contents  on 7 May '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 7 May '11

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

New MPECs  on 7 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-J32 - "16:45 UT" - 2011 JN5


MPEC 2011-J31 - "14:52 UT" - Comet C/2011 J2 (LINEAR)


<< DOU on 7 May '11 >>  MPEC 2011-J30 - "07:08 UT" - Daily Orbit Update


MPEC 2011-J29 - "03:21 UT" - 2011 JM5

Observers  on 7 May '11

A total of 27 observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-J31 -- C/2011 J2
235CAST Obs. in Italy, 1 in MPEC 2011-J31 -- C/2011 J2
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2011-J30 & 2011-J31 -- C/2011 J2, 2010 WQ7, 198856, 144332
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPECs 2011-J30 & 2011-J31 -- 2011 JU2, 2011 JL, 2011 JK, 2011 JD1, C/2011 J2, 2011 HO53, 2011 HJ61, 2011 GP65, 2011 GA55, 2011 FY22, 2007 LR32, 1998 KM3
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2011-J30 -- 2011 HT, 2011 HQ
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-J29 -- 2011 JM5
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2011-J31 -- C/2011 J2
A17Guidestar Obs. in Germany, 6 in MPECs 2011-J29 & 2011-J30 -- 2011 JM5, 2011 JA, 2011 HS4, 2011 HQ, 2000 YH4, 1998 UN1
B86Hagen Obs. in Germany, 1 in MPEC 2011-J29 -- 2011 JM5
704LINEAR in New Mexico, 7 in MPECs 2011-J29, 2011-J30, 2011-J31 & 2011-J32 -- 2011 JN5, 2011 JM5, C/2011 J2, 2011 HS, 2011 HO, 2004 FU4, 37336
J87La Canada Obs. in Spain, 1 in MPEC 2011-J31 -- C/2011 J2
130Lumezzane Obs. in Italy, 2 in MPEC 2011-J30 -- 2011 HS, 141432
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2011-J30, 2011-J31 & 2011-J32 -- 2011 JN5, C/2011 J2, 2011 GN44
474Mt. John Obs. in New Zealand, 1 in MPEC 2011-J31 -- C/2011 J2
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-J29, 2011-J30 & 2011-J32 -- 2011 JN5, 2011 JM5, 141432, 5646
I89Nerpio Obs. in Italy, 1 in MPEC 2011-J31 -- C/2011 J2
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-J31 -- C/2011 J2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-J31 -- C/2011 J2
473Remanzacco Obs. in Italy, 1 in MPEC 2011-J30 -- 2011 GD60
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-J32 -- 2011 JN5
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2011-J29 & 2011-J31 -- 2011 JM5, C/2011 J2
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-J29 -- 2011 JM5
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-J29 -- 2011 JM5
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2011-J30 & 2011-J31 -- 2011 JL, C/2011 J2, 2011 HS60, 2011 HP24, 2011 HO24, 2011 HN24, 2011 HJ7, 2011 HG, 2011 HF, 2011 HE24, 2011 HC36, 2011 GN44, 2010 LF86, 2001 QP181
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-J31 -- C/2011 J2
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-J31 -- C/2011 J2
D96Tzec Maun Obs. Moorook in South Australia, 1 in MPEC 2011-J31 -- C/2011 J2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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.
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 HN24NEODyS16142027-205328.7e-08-8.00-8.030NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-04-27.460 to 2011-05-06.423."
2011 HJ7JPL Sentry1614209412.9e-09-7.30-7.300JPL: "Analysis based on 27 observations spanning 10.977 days (2011-Apr-26.21907 to 2011-May-07.1961)." Diameter approximately 0.120 km. from mean, weighted H=22.2.
2011 GN44NEODyS1614R E M O V E D-
2011 AG5JPL Sentry16142036-2058142.2e-04-1.99-1.991JPL: "Analysis based on 125 observations spanning 116.19 days (2011-Jan-08.2673 to 2011-May-04.45821)." Diameter approximately 0.140 km. from mean, weighted H=21.9.

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 7 May '11

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

1731Grabbed MPEC 2011-J32 - 2011 JN5 - see above
1614Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
Noted that NEODyS has removed 2011 GN44 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 HJ7 risk assessment - see above
Noted that NEODyS has updated its 2011 HN24 risk assessment - see above
Grabbed MPEC 2011-J30 - Daily Orbit Update - see above
Grabbed MPEC 2011-J31 - Comet C/2011 J2 (LINEAR) - see above
0525Grabbed MPEC 2011-J29 - 2011 JM5 - see above