20 Aug. possible Jupiter impact evevnt. 
Credit: Masayuki Tachikawa.

There may have been another Jupiter impact, caught by amateur observer Masayuki Tachikawa in Japan around 1822 UT on August 20th. See Emily Lakdawalla's report for more info and links. Sky & Telescope reports no debris plume has been spotted during two subsequent Jupiter rotations, but corroboration has come from two other event observers in Japan. Image courtesy of M. Tachikawa (Ganymede at lower right, north is up).

Contents  on 23 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.

NEOCP Activity  on 23 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 23 August '10

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 23 Aug. '10 >>  MPEC 2010-Q23 - "06:09 UT" - Daily Orbit Update

Observers  on 23 August '10

Five observing facilities appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2010-Q23 -- 2010 PY75, 2010 PY22, 2010 PS66, 2010 PR66, 2010 PP2, 2010 PM9, 2010 PM10, 2010 PL9, 2010 ON101, 2010 OC, 2010 OB, 2010 MF1, 2007 VG189, 2007 LL, 2006 BN6, 2001 RY11
160Castelmartini Obs. in Italy, 2 in MPEC 2010-Q23 -- 2010 MF1, 2010 FO92
711McDonald Obs. in Texas, 2 in MPEC 2010-Q23 -- 2010 PS66, 154029
B38Santa Mama Obs. in Italy, 3 in MPEC 2010-Q23 -- 2010 MF1, 2010 FO92, 4055
I19Tanti Obs. in Argentina, 1 in MPEC 2010-Q23 -- 2010 LY63
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 Sentry14262098-210722.6e-07-4.04-4.040JPL: "Analysis based on 89 observations spanning 6.9460 days (2010-Aug-15.2648 to 2010-Aug-22.21081)." Diameter approximately 0.450 km. from mean, weighted H=19.4.
NEODyS1426R 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 23 August '10

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

1426Noted that JPL Sentry has updated its 2010 PR66 risk assessment - see above
Noted that NEODyS has removed 2010 PR66 as an impact risk - see above
Grabbed MPEC 2010-Q23 - Daily Orbit Update - see above