Contents  on 9 June '11


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 9 June '11

The MPC's NEO Confirmation Page has 109 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 109 objects listed. Of these, 72 were "one nighters." So far The Tracking News has counted a total of 143 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 9 June '11

Minor Planet Electronic Circulars

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

<< DOU on 9 June '11 >>  MPEC 2011-L34 - "07:08 UT" - Daily Orbit Update

Observers  on 9 June '11

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2011-L34 -- 2011 LZ2, 2011 LL2, 2011 LH, 2011 LD1, 2011 KN17, 2011 KJ15, 2011 KH4, 2011 KF9, 2011 KD11, 2011 JA8, 2011 HQ, 2011 GL60, 2007 LQ19
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2011-L34 -- 2011 HT, 2008 HE, 65909, 275714, 27346, 163348
807,Ovidiu Vaduvescu via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-L34 -- 175189
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2011-L34 -- 5879
J95Great Shefford Obs. in England, 1 in MPEC 2011-L34 -- 2011 KJ15
704LINEAR in New Mexico, 2 in MPEC 2011-L34 -- 2008 TR10, 7358
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-L34 -- 2009 BD
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2011-L34 -- 2011 LZ2, 154229, 5332
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-L34 -- 2011 KN9, 2011 HL7, 155341
204Schiaparelli Obs. in Italy, 3 in MPEC 2011-L34 -- 2011 LL2, 2011 LD1, 2008 VH
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2011-L34 -- 2011 KR12, 1916
291Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2011-L34 -- 2011 GL60, 2010 CN1, 2006 OS5
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-L34 -- 2011 KP17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 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 (backup) risk pages.





Notes for Today's Latest Risk Assessments
2011 LX10NEODyS15122014-2075212.08e-09-4.81-5.170NEODyS: "Based on 21 optical observations (of which 1 are rejected as outliers) from 2011-06-06.434 to 2011-06-08.449."
2011 KN17JPL Sentry1512207111.0e-06-4.72-4.720JPL: "Analysis based on 78 observations spanning 8.9797 days (2011-May-30.27802 to 2011-Jun-08.257683)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
NEODyS15122071-207111.0e-06-4.70-4.70NEODyS: "Based on 78 optical observations (of which 0 are rejected as outliers) from 2011-05-30.279 to 2011-06-08.258."

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 9 June '11

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

1512Noted that JPL Sentry has updated its 2011 KN17 risk assessment - see above
Noted that NEODyS has updated its 2011 KN17 risk assessment - see above
Noted that NEODyS has posted 2011 LX10 as an impact risk - see above
Grabbed MPEC 2011-L34 - Daily Orbit Update - see above