Contents  on 7 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 7 August '11

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2306 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of eighteen 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 August '11

Minor Planet Electronic Circulars

As of last check at 2306 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-P33 - "22:24 UT" - Comet 45P/Honda-Mrkos-Pajdusakova

MPEC 2011-P32 - "19:46 UT" - Comet C/2011 P2 (Panstarrs)

MPEC 2011-P31 - "16:58 UT" - Comet 45P/Honda-Mrkos-Pajdusakova

<< DOU on 7 Aug. '11 >>  MPEC 2011-P30 - "06:06 UT" - Daily Orbit Update

Observers  on 7 August '11

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
7057Krisztian Sarneczky via Apache Point Obs. in New Mexico, 1 in MPEC 2011-P30 -- 2002 XP40
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPEC 2011-P30 -- 2011 PU, 2011 PS, 2011 OV4, 2011 OD18, 2011 OB26
B88Bigmuskie Obs. in Italy, 1 in MPEC 2011-P30 -- 2000 CP101
A77Chante-Perdrix Obs. in France, 1 in MPEC 2011-P31 -- 45P
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-P32 -- C/2011 P2
F659Marco Micheli in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-P30 -- 2011 PX
157Frasso Sabino Obs. in Italy, 5 in MPEC 2011-P30 -- 2011 OY17, 2011 NZ, 2011 MV1, 2011 MK, 2004 RX10
J95Great Shefford Obs. in England, 1 in MPEC 2011-P32 -- C/2011 P2
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2011-P33 -- 45P
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-P32 -- C/2011 P2
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2011-P32 -- C/2011 P2
108Montelupo Obs. in Italy, 1 in MPEC 2011-P30 -- 2011 OV4
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-P32 -- C/2011 P2
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPECs 2011-P30 & 2011-P31 -- 2009 AV, 2008 VH, 2008 TR10, 45P
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-P32 -- C/2011 P2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-P32 -- C/2011 P2
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-P31 -- 45P
G68Sierra Stars Obs. in northern California, 1 in MPEC 2011-P33 -- 45P
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-P32 -- C/2011 P2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 7 August '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2306 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 OB26JPL Sentry16092074-2109204.1e-05-4.96-5.410JPL: "Analysis based on 23 observations spanning 8.8182 days (2011-Jul-28.4734 to 2011-Aug-06.29161)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
NEODyS16092087-208716.8e-09-8.61-8.610NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2011-07-28.474 to 2011-08-06.292."

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 August '11

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

2306Grabbed MPEC 2011-P33 - Comet 45P/Honda-Mrkos-Pajdusakova - see above
2102Grabbed MPEC 2011-P32 - Comet C/2011 P2 (Panstarrs) - see above
1705Grabbed MPEC 2011-P31 - Comet 45P/Honda-Mrkos-Pajdusakova - see above
1609Noted that JPL Sentry has updated its 2011 OB26 risk assessment - see above
Noted that NEODyS has updated its 2011 OB26 risk assessment - see above
Grabbed MPEC 2011-P30 - Daily Orbit Update - see above