Contents  on 30 July '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 30 July '11

The MPC's NEO Confirmation Page has 23 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 23 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 36 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 30 July '11

Minor Planet Electronic Circulars

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

MPEC 2011-O68 - "22:42 UT" - Comet 45P/Honda-Mrkos-Pajdusakova

MPEC 2011-O67 - "21:31 UT" - 2011 OY17

MPEC 2011-O66 - "21:26 UT" - 2011 OX17

MPEC 2011-O65 - "21:17 UT" - 2011 OW17

MPEC 2011-O64 - "21:15 UT" - 2011 OV17

MPEC 2011-O63 - "21:06 UT" - 2011 OE16

MPEC 2011-O62 - "19:02 UT" - 2011 OR17

MPEC 2011-O61 - "18:11 UT" - 2007 WU4

MPEC 2011-O60 - "15:05 UT" - 2010 TK7

MPEC 2011-O59 - "10:00 UT" - 2011 OD16

<< DOU on 30 July '11 >>  MPEC 2011-O58 - "06:05 UT" - Daily Orbit Update

Observers  on 30 July '11

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2011-O58, 2011-O59, 2011-O63, 2011-O64 & 2011-O65 -- 2011 OW4, 2011 OW17, 2011 OV17, 2011 OE16, 2011 OD16, 2011 NP, 2011 ND, 2011 MO4, 2011 MN4
300Bisei Spaceguard Center in Japan, 3 in MPEC 2011-O58 -- 2011 OV4, 2011 NY, 39565
I77CEAMIG-REA in Brazil, 1 in MPEC 2011-O62 -- 2011 OR17
807|Robert Holmes via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-O63 -- 2011 OE16
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2011-O58 -- 136923
958Dax Obs. in France, 1 in MPEC 2011-O68 -- 45P
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-O59 & 2011-O65 -- 2011 OW17, 2011 OD16
E10Faulkes Telescope South in New South Wales, 2 in MPECs 2011-O59 & 2011-O64 -- 2011 OV17, 2011 OD16
E16Grove Creek Obs. in New South Wales, 2 in MPECs 2011-O62 & 2011-O68 -- 2011 OR17, 45P
J59Linceo Obs. in Spain, 1 in MPEC 2011-O58 -- 3288
5683Christian Veillet on Mauna Kea in Hawaii, 1 in MPEC 2011-O60 -- 2010 TK7
C27Pallerols Obs. in Spain, 3 in MPEC 2011-O58 -- 89959, 267759, 4596
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPECs 2011-O58, 2011-O59, 2011-O63, 2011-O64, 2011-O65 & 2011-O67 -- 2011 OY17, 2011 OW17, 2011 OV17, 2011 OE16, 2011 OD16, 2011 FB29, 2008 CG119, 2002 GF1
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-O58 -- 4581
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2011-O62, 2011-O67 & 2011-O68 -- 2011 OY17, 2011 OR17, 45P
204Schiaparelli Obs. in Italy, 5 in MPECs 2011-O58, 2011-O62, 2011-O66 & 2011-O67 -- 2011 OY17, 2011 OX17, 2011 OR17, 2011 MT, 2011 KW19
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPECs 2011-O58, 2011-O61, 2011-O62 & 2011-O66 -- 2011 OX17, 2011 OR17, 2007 WU4, 85490
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-O67 -- 2011 OY17
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 July '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 OY17JPL Sentry23592037-208339.5e-09-6.34-6.400JPL: "Analysis based on 11 observations spanning 2.6922 days (2011-Jul-27.34292 to 2011-Jul-30.03509)." Diameter approximately 0.170 km. from mean, weighted H=21.5.

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 30 July '11

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

2359Noted that JPL Sentry has posted 2011 OY17 as an impact risk - see above
2301Grabbed MPEC 2011-O68 - Comet 45P/Honda-Mrkos-Pajdusakova - see above
2204Grabbed MPEC 2011-O66 - 2011 OX17 - see above
Grabbed MPEC 2011-O67 - 2011 OY17 - see above
2125Grabbed MPEC 2011-O63 - 2011 OE16 - see above
Grabbed MPEC 2011-O64 - 2011 OV17 - see above
Grabbed MPEC 2011-O65 - 2011 OW17 - see above
2007Grabbed MPEC 2011-O61 - 2007 WU4 - see above
Grabbed MPEC 2011-O62 - 2011 OR17 - see above
1618Grabbed MPEC 2011-O58 - Daily Orbit Update - see above
Grabbed MPEC 2011-O59 - 2011 OD16 - see above
Grabbed MPEC 2011-O60 - 2010 TK7 - see above