Contents  on 18 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 18 June '11

The MPC's NEO Confirmation Page has 2 listings

When last checked at 2314 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two objects listed. Both of these were "one nighters."

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 18 June '11

Minor Planet Electronic Circulars

As of last check at 2314 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 18 June '11 >>  MPEC 2011-M12 - "07:06 UT" - Daily Orbit Update

Observers  on 18 June '11

Five observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2011-M12 -- 2011 LJ1, 2011 LD1, 2011 LC19, 2011 LA19, 2011 GQ65, 2011 GA62, 2008 TR10, 2008 HE, 2007 LQ19, 2004 LH, 2004 JO2
I99Blanquita Obs. in Spain, 3 in MPEC 2011-M12 -- 68348, 3988, 1036
A24New Millennium Obs. in Italy, 9 in MPEC 2011-M12 -- 2011 LT17, 2011 EZ78, 68348, 137170, 5496, 3988, 3288, 3103, 1036
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-M12 -- 2006 MJ10, 267759, 139345
A92Urseanu Obs. in Romania, 1 in MPEC 2011-M12 -- 1036
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 June '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2314 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 LC19JPL Sentry1500210721.3e-09-5.88-6.070JPL: "Analysis based on 31 observations spanning 6.8726 days (2011-Jun-10.3103 to 2011-Jun-17.18291)." Diameter approximately 0.750 km. from mean, weighted H=18.3.
2011 LT17JPL Sentry15002072-211171.2e-06-4.49-4.560JPL: "Analysis based on 81 observations spanning 6.7927 days (2011-Jun-09.33984 to 2011-Jun-16.132524)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
NEODyS15002072-207328.75e-07-4.58-4.590NEODyS: "Based on 83 optical observations (of which 2 are rejected as outliers) from 2011-06-09.341 to 2011-06-16.133."

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 18 June '11

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

1500Noted that JPL Sentry has updated its 2011 LC19 risk assessment - see above
Noted that JPL Sentry has updated its 2011 LT17 risk assessment - see above
Noted that NEODyS has updated its 2011 LT17 risk assessment - see above
Grabbed MPEC 2011-M12 - Daily Orbit Update - see above