Contents  on 23 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 23 June '11

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2207 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 22 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 23 June '11

Minor Planet Electronic Circulars

As of last check at 2207 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-M25 - "11:34 UT" - 2011 MF

MPEC 2011-M24 - "11:30 UT" - 2011 ME

MPEC 2011-M23 - "11:04 UT" - 2011 MD

<< DOU on 23 June '11 >>  MPEC 2011-M22 - "07:06 UT" - Daily Orbit Update

Observers  on 23 June '11

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 2 in MPECs 2011-M22 & 2011-M24 -- 2011 ME, 87025
I99Blanquita Obs. in Spain, 1 in MPEC 2011-M22 -- 2011 DL19
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2011-M22 -- 2011 LJ1, 2011 DL19, 2008 TR10, 281375, 264308, 2061
J95Great Shefford Obs. in England, 3 in MPECs 2011-M23, 2011-M24 & 2011-M25 -- 2011 MF, 2011 ME, 2011 MD
704LINEAR in New Mexico, 3 in MPECs 2011-M22, 2011-M23 & 2011-M24 -- 2011 ME, 2011 MD, 219071
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-M22 -- 433
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-M23 -- 2011 MD
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-M22 -- 2010 XO56
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2011-M23 & 2011-M24 -- 2011 ME, 2011 MD
H36Sandlot Obs. in Kansas, 4 in MPECs 2011-M22, 2011-M23, 2011-M24 & 2011-M25 -- 2011 MF, 2011 ME, 2011 MD, 2011 LD19
204Schiaparelli Obs. in Italy, 2 in MPEC 2011-M22 -- 2011 LJ1, 2011 LC19
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-M22 -- 2008 EP6
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2011-M22 & 2011-M25 -- 2011 MF, 2005 AB, 217837, 5751
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2011-M22 & 2011-M25 -- 2011 MF, 2011 LK19, 2011 LJ19, 2011 KW19, 2011 KQ19, 2011 KN17, 2006 KF89
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 June '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2207 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 MDJPL Sentry15182022-2108504.8e-02-2.66-2.800JPL: "Analysis based on 17 observations spanning 1.0088 days (2011-Jun-22.26489 to 2011-Jun-23.27366)." Diameter approximately 0.010 km. from mean, weighted H=27.6.
2011 LJ19JPL Sentry1518R E M O V E DJPL: Risk listing removed at 0951 UTC.
2011 KE15JPL Sentry22072020-204956.9e-05-4.47-4.470JPL: "Analysis based on 21 observations spanning 7.7976 days (2011-May-26.26154 to 2011-Jun-03.059102)." Diameter approximately 0.014 km. from mean, weighted H=26.9.

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 23 June '11

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

2207Noted that JPL Sentry has reposted 2011 KE15 as an impact risk - see above
1518Noted that JPL Sentry has removed 2011 LJ19 as an impact risk - see above
Noted that JPL Sentry has posted 2011 MD as an impact risk - see above
Grabbed MPEC 2011-M22 - Daily Orbit Update - see above
Grabbed MPEC 2011-M23 - 2011 MD - see above
Grabbed MPEC 2011-M24 - 2011 ME - see above
Grabbed MPEC 2011-M25 - 2011 MF - see above