Contents  on 20 July '09


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 20 July '09

The MPC's NEO Confirmation Page has 2 listings: 2 new

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new listings. Both of these were "one nighters." So far The Tracking News has counted a total of four listings on the NEOCP at some point 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 20 July '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 20 July '09 >>  MPEC 2009-O17 - "06:06 UT" - Daily Orbit Update

Observers  on 20 July '09

Fourteen observing facilities appear in today's MPEC.

CodeObserver / observatory
I08Alianza S4 Obs. in Argentina, 1 in MPEC 2009-O17 -- 2009 ND1
H55Astronomical Research Obs. (ARO) in Illinois, 6 in MPEC 2009-O17 -- 2009 MX6, 2009 MN8, 2009 ML1, 2009 LS, 2009 HB82, 23187
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2009-O17 -- 17274, 9162
J05Bootes Obs., 4 in MPEC 2009-O17 -- 2009 NH, 2001 AA50, 11500, 433
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-O17 -- 2009 OC
J95Great Shefford Obs. in England, 1 in MPEC 2009-O17 -- 2009 OF
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2009-O17 -- 2009 OG
J75La Sagra Obs. in Spain, 2 in MPEC 2009-O17 -- 52387, 24761
A06Mataro Obs. in Spain, 1 in MPEC 2009-O17 -- 15745
474Mt. John Obs. in New Zealand, 4 in MPEC 2009-O17 -- 2009 OG, 2007 AG12, 2004 SW55, 2001 HA4
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2009-O17 -- 2009 ND1
E12Siding Spring Survey (SSS) in New South Wales, 12 in MPEC 2009-O17 -- 2009 OG, 2009 LX, 52768, 25330, 20460, 154229, 138859, 12711, 4957, 4954, 3199, 1566
F85Tiki Obs. in Tahiti, 1 in MPEC 2009-O17 -- 2009 OC
198Wildberg Obs. in Germany, 1 in MPEC 2009-O17 -- 2002 YQ5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 July '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.





Notes for Today's Latest Risk Assessments
2009 OFJPL Sentry1404203922.2e-06-3.59-3.690JPL: "Analysis based on 25 observations spanning 2.7231 days (2009-Jul-17.21281 to 2009-Jul-19.93588)." Diameter approximately 0.190 km. from mean, weighted H=21.2.
NEODyS1404203922.62e-06-3.53-3.760NEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2009/07/17.214 to 2009/07/19.937."

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 20 July '09

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

1404Noted that JPL Sentry has updated its 2009 OF risk assessment - see above
Noted that NEODyS has updated its 2009 OF risk assessment - see above
Grabbed MPEC 2009-O17 - Daily Orbit Update - see above