Contents  on 4 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 4 June '11

The MPC's NEO Confirmation Page has 79 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 79 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 106 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 4 June '11

Minor Planet Electronic Circulars

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

MPEC 2011-L17 - "16:43 UT" - 2011 LH

MPEC 2011-L16 - "15:56 UT" - 2009 BB11

<< DOU on 4 June '11 >>  MPEC 2011-L15 - "07:08 UT" - Daily Orbit Update

Observers  on 4 June '11

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2011-L15 -- 162474
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2011-L16 -- 2009 BB11
703Catalina Sky Survey (CSS) in Arizona, 12 in MPEC 2011-L15 -- 2011 KK15, 2011 HQ, 2011 HO, 2011 GQ65, 2008 HE, 86878, 85490, 65909, 267494, 256670, 20086, 7889
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPECs 2011-L15 & 2011-L17 -- 2011 LH, 2011 KW15, 2011 KQ19, 2011 KO17, 2011 KN17, 2011 KK15, 2011 KE15, 2011 KC15
639Dresden Obs. in Germany, 2 in MPEC 2011-L15 -- 267494, 1866
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2011-L15 -- 2009 BD
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-L15 -- 2009 BD
704LINEAR in New Mexico, 1 in MPEC 2011-L15 -- 2011 HT
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-L15 -- 2011 JP29
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-L15 & 2011-L17 -- 2011 LH, 5751, 2061
A24New Millennium Obs. in Italy, 1 in MPEC 2011-L15 -- 2011 KY15
J69North Obs. in England, 1 in MPEC 2011-L15 -- 267494
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-L17 -- 2011 LH
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-L15 -- 2009 BD
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2011-L15 -- 2011 KU15
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 KN17JPL Sentry1519207115.7e-07-4.99-4.990JPL: "Analysis based on 62 observations spanning 3.9707 days (2011-May-30.27802 to 2011-Jun-03.24869)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
NEODyS15192071-207115.9e-07-4.97-4.970NEODyS: "Based on 62 optical observations (of which 0 are rejected as outliers) from 2011-05-30.279 to 2011-06-03.249."
2011 KE15NEODyS15192038-207245.93e-08-8.38-8.510NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2011-05-26.262 to 2011-06-03.378."
JPL Sentry1519R E M O V E DJPL: Risk listing removed at 1052 UTC.

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 4 June '11

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

1704Grabbed MPEC 2011-L16 - 2009 BB11 - see above
Grabbed MPEC 2011-L17 - 2011 LH - see above
1519Noted that JPL Sentry has removed 2011 KE15 as an impact risk - see above
Noted that NEODyS has updated its 2011 KE15 risk assessment - see above
Noted that JPL Sentry has updated its 2011 KN17 risk assessment - see above
Noted that NEODyS has updated its 2011 KN17 risk assessment - see above
Grabbed MPEC 2011-L15 - Daily Orbit Update - see above