Contents  on 31 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 31 July '11

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 31 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 31 July '11

Minor Planet Electronic Circulars

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

MPEC 2011-O72 - "23:01 UT" - Comet 45P/Honda-Mrkos-Pajdusakova

MPEC 2011-O71 - "10:46 UT" - 2011 OD18

MPEC 2011-O70 - "10:44 UT" - 2011 OC18

<< DOU on 31 July '11 >>  MPEC 2011-O69 - "06:06 UT" - Daily Orbit Update

Observers  on 31 July '11

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 2 in MPECs 2011-O69 & 2011-O70 -- 2011 OC18, 2011 NP
A77Chante-Perdrix Obs. in France, 1 in MPEC 2011-O72 -- 45P
958Dax Obs. in France, 1 in MPEC 2011-O72 -- 45P
J95Great Shefford Obs. in England, 1 in MPEC 2011-O70 -- 2011 OC18
J87La Canada Obs. in Spain, 1 in MPEC 2011-O70 -- 2011 OC18
J75La Sagra Obs. in Spain, 2 in MPECs 2011-O70 & 2011-O71 -- 2011 OD18, 2011 OC18
J59Linceo Obs. in Spain, 1 in MPEC 2011-O72 -- 45P
945Monte Deva Obs. in Spain, 1 in MPEC 2011-O72 -- 45P
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 6 in MPEC 2011-O69 -- 2011 OY17, 2011 OX4, 2011 OV4, 2011 OQ5, 2011 OM5, 2011 OL5
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2011-O69 & 2011-O70 -- 2011 OE16, 2011 OC18, 2011 CH71
B38Santa Mama Obs. in Italy, 3 in MPEC 2011-O69 -- 2011 KP17, 2011 JP29, 68348
204Schiaparelli Obs. in Italy, 2 in MPECs 2011-O70 & 2011-O72 -- 2011 OC18, 45P
I93St. Pardon de Conques Obs. in France, 6 in MPECs 2011-O69, 2011-O70 & 2011-O71 -- 2011 OD18, 2011 OC18, 2006 WP127, 2006 SC6, 2005 TR15, 85804
367Yatsuka Obs. in Japan, 1 in MPEC 2011-O72 -- 45P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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 OD18JPL Sentry15372034-208061.6e-07-7.54-7.960JPL: "Analysis based on 10 observations spanning .09450 days (2011-Jul-31.05702 to 2011-Jul-31.15152)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
2011 OY17JPL Sentry1537R E M O V E DJPL: Risk listing removed at 0949 UTC.

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 31 July '11

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

2318Grabbed MPEC 2011-O72 - Comet 45P/Honda-Mrkos-Pajdusakova - see above
1537Noted that JPL Sentry has posted 2011 OD18 as an impact risk - see above
Noted that JPL Sentry has removed 2011 OY17 as an impact risk - see above
Grabbed MPEC 2011-O69 - Daily Orbit Update - see above
Grabbed MPEC 2011-O70 - 2011 OC18 - see above
Grabbed MPEC 2011-O71 - 2011 OD18 - see above