4 Vesta's south pole imaged 24 July 2011. 

NASA/JPL reported yesterday on the Dawn mission beginning its year-long study of 4 Vesta. This image from the spacecraft's framing camera on 24 July 2011 shows high ground at the giant asteroid's south pole. Credit: NASA/JPL-Caltech/UCLA/ MPS/DLR/IDA.

Contents  on 2 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 2 August '11

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 34 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 2 August '11

Minor Planet Electronic Circulars

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

MPEC 2011-P08 - "22:46 UT" - Comet 45P/Honda-Mrkos-Pajdusakova

MPEC 2011-P07 - "12:05 UT" - 2011 OP24

MPEC 2011-P06 - "12:02 UT" - 2011 ON24

<< DOU on 2 Aug. '11 >>  MPEC 2011-P05 - "06:05 UT" - Daily Orbit Update

MPEC 2011-P04 - "01:10 UT" - Comet 45P/Honda-Mrkos-Pajdusakova

MPEC 2011-P03 - "00:38 UT" - Comet C/2011 O1 (LINEAR)

Observers  on 2 August '11

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2011-P03 -- C/2011 O1
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2011-P03, 2011-P05, 2011-P06 & 2011-P07 -- 2011 OR15, 2011 OQ5, 2011 OP24, 2011 ON24, 2011 OD18, C/2011 O1, 2011 JP29, 2011 JA8, 2011 HL7, 2002 RC118
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-P05 -- 2002 UX
I99Blanquita Obs. in Spain, 1 in MPEC 2011-P03 -- C/2011 O1
958Dax Obs. in France, 1 in MPEC 2011-P04 -- 45P
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2011-P07 -- 2011 OP24
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-P03 -- C/2011 O1
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-P05 & 2011-P06 -- 2011 OV18, 2011 ON24
203GiaGa Obs. in Italy, 3 in MPEC 2011-P05 -- 2011 OC18, 2011 JA8, 2008 SO
A17Guidestar Obs. in Germany, 4 in MPEC 2011-P05 -- 2011 OQ5, 2011 OC18, 2011 OA, 2002 UX
B86Hagen Obs. in Germany, 1 in MPEC 2011-P03 -- C/2011 O1
240Herrenberg Obs. in Germany, 2 in MPEC 2011-P05 -- 85804, 267759
704LINEAR in New Mexico, 1 in MPEC 2011-P03 -- C/2011 O1
J87La Canada Obs. in Spain, 1 in MPEC 2011-P03 -- C/2011 O1
C10Maisoncelles Obs. in France, 1 in MPECs 2011-P04 & 2011-P08 -- 45P
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-P06 & 2011-P07 -- 2011 OP24, 2011 ON24
J52Pinsoro Obs. in Spain, 1 in MPEC 2011-P04 -- 45P
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 2 in MPECs 2011-P03 & 2011-P08 -- C/2011 O1, 45P
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-P08 -- 45P
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-P03 -- C/2011 O1
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-P03 -- C/2011 O1
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPECs 2011-P03, 2011-P04, 2011-P05 & 2011-P08 -- C/2011 O1, 2008 QF, 1994 RC, 45P
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2011-P03 & 2011-P05 -- 2011 OC18, C/2011 O1, 2011 LX10
A78Stia Obs. in Italy, 2 in MPEC 2011-P05 -- 2011 KP17, 2011 JP29
B51Vallauris Obs. in France, 1 in MPEC 2011-P04 -- 45P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 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 OD18JPL Sentry1603211012.0e-07-7.77-7.770JPL: "Analysis based on 13 observations spanning 1.2960 days (2011-Jul-31.05702 to 2011-Aug-01.353028)." Diameter approximately 0.017 km. from mean, weighted H=26.4.
NEODyS1603R E M O V E D-

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 2 August '11

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

2359Grabbed MPEC 2011-P08 - Comet 45P/Honda-Mrkos-Pajdusakova - see above
1603Noted that JPL Sentry has updated its 2011 OD18 risk assessment - see above
Noted that NEODyS has removed 2011 OD18 as an impact risk - see above
Grabbed MPEC 2011-P05 - Daily Orbit Update - see above
Grabbed MPEC 2011-P06 - 2011 ON24 - see above
Grabbed MPEC 2011-P07 - 2011 OP24 - see above
0255Grabbed MPEC 2011-P03 - Comet C/2011 O1 (LINEAR) - see above
Grabbed MPEC 2011-P04 - Comet 45P/Honda-Mrkos-Pajdusakova - see above