Contents  on 6 August '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 6 August '11

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of fifteen 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 6 August '11

Minor Planet Electronic Circulars

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

MPEC 2011-P29 - "12:18 UT" - 2011 PO1

MPEC 2011-P28 - "12:16 UT" - 2011 PN1

MPEC 2011-P27 - "12:15 UT" - 2011 OF26

<< DOU on 6 Aug. '11 >>  MPEC 2011-P26 - "06:04 UT" - Daily Orbit Update

MPEC 2011-P25 - "04:14 UT" - Comet 213P-B/Van Ness

Observers  on 6 August '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2011-P26 & 2011-P29 -- 2011 PO1, 2011 OW4, 2011 LD19
807|Robert Holmes via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-P26 -- 2011 ME5
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2011-P25 -- 213P-B
F65Faulkes Telescope North in Hawaii, 1 in MPEC 2011-P25 -- 213P-B
J95Great Shefford Obs. in England, 1 in MPEC 2011-P29 -- 2011 PO1
5682David Tholen's team on Mauna Kea in Hawaii, 4 in MPECs 2011-P26, 2011-P27 & 2011-P28 -- 2011 PN1, 2011 OF26, 2011 OE26, 2011 OB26
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2011-P26 -- 2001 FA1
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2011-P26 -- 2001 HW15
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2011-P27, 2011-P28 & 2011-P29 -- 2011 PO1, 2011 PN1, 2011 OF26
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-P29 -- 2011 PO1
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-P29 -- 2011 PO1
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2011-P25 & 2011-P29 -- 2011 PO1, 213P-B
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-P29 -- 2011 PO1
204Schiaparelli Obs. in Italy, 7 in MPEC 2011-P26 -- 2009 WR6, 2009 AV, 2008 EP6, 2007 YF1, 2005 XY, 2005 TZ51, 2001 MQ3
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2011-P26 -- 2011 OX17, 2011 OB
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-P29 -- 2011 PO1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 6 August '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 risk pages.





Notes for Today's Latest Risk Assessments
2011 PO1JPL Sentry15352079-208337.1e-09-6.37-6.450JPL: "Analysis based on 35 observations spanning 1.8210 days (2011-Aug-04.50809 to 2011-Aug-06.329073)." Diameter approximately 0.240 km. from mean, weighted H=20.8.
2011 PN1JPL Sentry15352021-21101055.4e-07-7.58-8.220JPL: "Analysis based on 6 observations spanning 1.0655 days (2011-Aug-02.47123 to 2011-Aug-03.536708)." Diameter approximately 0.010 km. from mean, weighted H=27.8.
2011 OF26JPL Sentry15352014-21081531.0e-07-6.17-6.470JPL: "Analysis based on 8 observations spanning 1.0039 days (2011-Jul-28.47692 to 2011-Jul-29.480832)." Diameter approximately 0.034 km. from mean, weighted H=25.0.
2011 OB26JPL Sentry15352074-2109234.2e-05-4.92-5.370JPL: "Analysis based on 19 observations spanning 7.5460 days (2011-Jul-28.4734 to 2011-Aug-05.019421)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS15352088-209029.57e-09-8.42-8.560NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2011-07-28.474 to 2011-08-05.020."

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 6 August '11

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

1535Noted that JPL Sentry has updated its 2011 OB26 risk assessment - see above
Noted that NEODyS has updated its 2011 OB26 risk assessment - see above
Noted that JPL Sentry has posted 2011 OF26 as an impact risk - see above
Noted that JPL Sentry has posted 2011 PN1 as an impact risk - see above
Noted that JPL Sentry has posted 2011 PO1 as an impact risk - see above
Grabbed MPEC 2011-P26 - Daily Orbit Update - see above
Grabbed MPEC 2011-P27 - 2011 OF26 - see above
Grabbed MPEC 2011-P28 - 2011 PN1 - see above
Grabbed MPEC 2011-P29 - 2011 PO1 - see above
0600Grabbed MPEC 2011-P25 - Comet 213P-B/Van Ness - see above