HST 14 May 2007 image of Dawn destination, 4 Vesta. 
Credit: NASA, ESA, McFadden & Bacon.

This Hubble Space Telescope image of 4 Vesta is from May three years ago. In May of next year the ion-propelled Dawn spacecraft will begin maneuvering to be captured into orbit around Vesta, bringing the second largest Main Belt object into sharp view by July. See Science@NASA's preview report from yesterday. Image credit: NASA, ESA, L. McFadden, and G. Bacon.

Contents  on 20 August '10


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.

Radar Astrometry  on 20 August '10

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 2115 UTC when the database was dated 20 Aug.

NEOCP Activity  on 20 August '10

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty and hasn't been noted by The Tracking News as being active yet today (checked at 2358 UTC). It was last noted active yesterday.

New MPECs  on 20 August '10

Minor Planet Electronic Circulars

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

MPEC 2010-Q17 - "20:39 UT" - Comet C/2010 L4 (WISE)

MPEC 2010-Q16 - "20:03 UT" - Comet C/2010 L3 (Catalina)

MPEC 2010-Q15 - "15:39 UT" - 2007 RU12

<< DOU on 20 Aug. '10 >>  MPEC 2010-Q14 - "06:12 UT" - Daily Orbit Update

Observers  on 20 August '10

Eleven observing facilities appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2008 EV5
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2010-Q14 -- 2010 PY22, 2010 PS66, 2010 PR66, 2010 PP2, 2010 PL9, 2010 OL100, 2010 MF1, 2010 GU21, 1999 TB5, 1998 WC2, 2608
215Buchloe Obs. in Germany, 1 in MPEC 2010-Q16 -- C/2010 L3
160Castelmartini Obs. in Italy, 4 in MPECs 2010-Q14 & 2010-Q17 -- 2010 MF1, C/2010 L4, 2010 FO92, 2007 VG189
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2010-Q15 -- 2007 RU12
118Modra Obs. in Slovakia, 1 in MPEC 2010-Q16 -- C/2010 L3
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2010-Q14 -- 143381
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2010-Q14 -- 2010 NG3
204Schiaparelli Obs. in Italy, 2 in MPECs 2010-Q16 & 2010-Q17 -- C/2010 L4, C/2010 L3
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2010-Q14 & 2010-Q16 -- 2010 OL100, 2010 OK126, 2010 OF101, 2010 OD101, C/2010 L3, 24443, 138155
I15Wishing Star Obs. in Rhode Island, 4 in MPEC 2010-Q14 -- 2010 PY22, 2010 MF1, 2007 VG189, 161998
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 August '10

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. 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 (backup) risk pages.





Notes for Today's Latest Risk Assessments
2010 PR66JPL Sentry14102078-210742.5e-07-4.09-4.280JPL: "Analysis based on 52 observations spanning 3.9164 days (2010-Aug-15.2648 to 2010-Aug-19.18118)." Diameter approximately 0.440 km. from mean, weighted H=19.4.
NEODyS14102078-208523.19e-09-5.81-5.810NEODyS: "Based on 52 optical observations (of which 0 are rejected as outliers) from 2010/08/15.266 to 2010/08/19.182."

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 August '10

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

2115Grabbed MPEC 2010-Q16 - Comet C/2010 L3 (Catalina) - see above
Grabbed MPEC 2010-Q17 - Comet C/2010 L4 (WISE) - see above
Noted Radar Astrometry database update - see above
1629Grabbed MPEC 2010-Q15 - 2007 RU12 - see above
1411Grabbed MPEC 2010-Q14 - Daily Orbit Update - see above
1410Noted that JPL Sentry has updated its 2010 PR66 risk assessment - see above
Noted that NEODyS has updated its 2010 PR66 risk assessment - see above