Contents  on 11 June '11


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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 June '11

The MPC's NEO Confirmation Page has 100 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 100 objects listed. Of these, 68 were "one nighters." The Tracking News counted a total of 115 listings on the NEOCP on this day.

New MPECs  on 11 June '11

Minor Planet Electronic Circulars

There were five MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-L44 - "23:56 UT" - 2011 LA19

MPEC 2011-L43 - "20:39 UT" - 2010 NJ1

MPEC 2011-L42 - "18:28 UT" - Comet C/2011 L6 (Boattini)

MPEC 2011-L41 - "15:27 UT" - Comet P/2000 G1 = 2011 L5 (LINEAR)

<< DOU on 11 June '11 >>  MPEC 2011-L40 - "07:10 UT" - Daily Orbit Update

Observers  on 11 June '11

Nineteen observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2011-L40 -- 2011 LJ1, 2011 LD1, 2004 LH
A81Balzaretto Obs. in Italy, 2 in MPEC 2011-L40 -- 2001 QP181, 1998 KM3
703Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2011-L40 & 2011-L44 -- 2011 LA19, 2011 EZ78, 138883
807,Ovidiu Vaduvescu via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-L40 -- 2006 CT10
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPECs 2011-L40 & 2011-L44 -- 2011 LX10, 2011 LJ1, 2011 LH, 2011 LD1, 2011 LA19, 2011 KR12
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-L40 -- 2011 LJ1, 2011 LD1, 2011 KC15, 2011 FB29
J95Great Shefford Obs. in England, 1 in MPEC 2011-L44 -- 2011 LA19
704LINEAR in New Mexico, 7 in MPECs 2011-L40, 2011-L43 & 2011-L44 -- 2011 LT17, 2011 LA19, 2011 CH71, 2010 NJ1, 2008 VH, 275545, 267759
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-L43 & 2011-L44 -- 2011 LA19, 2010 NJ1
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-L40 & 2011-L42 -- C/2011 L6, 2011 KC15, 2011 JR13, 8567
583Odessa-Mayaki Obs. in the Ukraine, 2 in MPEC 2011-L40 -- 2011 EZ78, 267494
H45Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2011-L40 -- 2011 EZ78
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-L44 -- 2011 LA19
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-L44 -- 2011 LA19
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-L40 -- 137158
B31Southern African Large Telescope in South Africa, 1 in MPEC 2011-L40 -- 2009 BD
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-L40 -- 2011 AO52
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2011-L40, 2011-L41, 2011-L42 & 2011-L44 -- 2011 LY2, 2011 LA19, C/2011 L6, P/2011 L5, 2011 KQ19, 2011 KE3
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-L44 -- 2011 LA19
6734Mike Hicks via Table Mtn. Obs. in southern California, 1 in MPEC 2011-L44 -- 2011 LA19
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 June '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 risk pages.





Notes for Today's Latest Risk Assessments
2011 LT17JPL Sentry15462072-2109121.9e-06-4.10-4.350JPL: "Analysis based on 40 observations spanning 1.5304 days (2011-Jun-09.33984 to 2011-Jun-10.870223)." Diameter approximately 0.180 km. from mean, weighted H=21.4.
2011 KF36JPL Sentry00512024-210681.2e-09-6.13-6.600JPL: "Analysis based on 9 observations spanning 2.0159 days (2011-May-30.340411 to 2011-Jun-01.356316)." Diameter approximately 0.280 km. from mean, weighted H=20.4.

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 June '11

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

0018 6/12Grabbed MPEC 2011-L44 - 2011 LA19 - see above
2133Grabbed MPEC 2011-L43 - 2010 NJ1 - see above
1909Grabbed MPEC 2011-L42 - Comet C/2011 L6 (Boattini) - see above
1546Noted that JPL Sentry has updated its 2011 LT17 risk assessment - see above
Grabbed MPEC 2011-L40 - Daily Orbit Update - see above
Grabbed MPEC 2011-L41 - Comet P/2000 G1 = 2011 L5 (LINEAR) - see above
0051Noted that JPL Sentry has posted 2011 KF36 as an impact risk - see above