Contents  on 7 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 7 June '11

The MPC's NEO Confirmation Page has 70 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 70 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 93 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 7 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 7 June '11 >>  MPEC 2011-L29 - "07:08 UT" - Daily Orbit Update

Observers  on 7 June '11

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2011-L29 -- 2011 LH, 2011 KW19, 2011 KQ19, 2011 KK15, 2011 KJ15, 2011 KH4, 2011 KF9, 2011 JA, 2011 HR, 2002 NY31
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2011-L29 -- 2011 LL2, 263976, 251346, 162463, 137170, 4954
807,Ovidiu Vaduvescu via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2011-L29 -- 2008 QT3, 2006 LK
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-L29 -- 2011 LL2
474Mt. John Obs. in New Zealand, 2 in MPEC 2011-L29 -- 2011 LH, 2011 KP16
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2011-L29 -- 2011 LL2, 2011 LD1
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2011-L29 -- 2011 KN17, 2011 JZ10, 2007 FD, 163335
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-L29 -- 2011 LL2
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-L29 -- 2011 LL2
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-L29 -- 2011 LL2
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPEC 2011-L29 -- 2011 KW15, 2011 KD11, 2011 DL19, 2009 BD, 2001 UE5, 86039
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2011-L29 -- 2011 KE3, 2011 AO52, 2006 RG7, 2003 WM25, 37336
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2011-L29 -- 2011 KT15
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 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 Sentry1440207116.4e-07-4.93-4.930JPL: "Analysis based on 71 observations spanning 7.1544 days (2011-May-30.27802 to 2011-Jun-06.43244)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
NEODyS14402071-207116.7e-07-4.89-4.890NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2011-05-30.279 to 2011-06-06.433."

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 June '11

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

1440Noted 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-L29 - Daily Orbit Update - see above