Jupiter event from 20 July 2009. Image 
from NASA/JPL Infrared Telescope Facility.

Southern Jupiter impact? The bright infrared signature of an unusual optically dark spot is seen in this July 20th image from the Infrared Telescope Facility (IRTF) on Mauna Kea in Hawaii after discovery by amateur astronomer Anthony Wesley in New South Wales. See more images. This image courtesy of NASA/JPL/IRTF.

Sound and look familiar? It was exactly fifteen years ago that pieces of comet C/Shoemaker-Levy 9 (1993e) struck Jupiter, during 16-22 July 1994.

Contents  on 21 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 21 July '09

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2309 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and one updated listing. Of these, one was a "one nighter." So far The Tracking News has counted a total of three 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 21 July '09

Minor Planet Electronic Circulars

As of last check at 2309 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-O22 - "22:08 UT" - Comets C/2009 L12, 2009 L13, 2009 L14, 2009 L15 (SOHO)

MPEC 2009-O21 - "22:03 UT" - Comets C/2009 L7, 2009 L8, 2009 L9, 2009 L10, 2009 L11 (SOHO)

<< DOU on 21 July '09 >>  MPEC 2009-O20 - "06:09 UT" - Daily Orbit Update

MPEC 2009-O19 - "02:16 UT" - Comets C/2009 L3, 2009 L4, 2009 L5, 2009 L6 (SOHO)

MPEC 2009-O18 - "02:08 UT" - Comets C/2009 K11, 2009 K12, 2009 K13, 2009 K14 (SOHO)

Observers  on 21 July '09

A total of 20 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 10 in MPEC 2009-O20 -- 2009 OF, 2009 NL, 2009 NJ, 2009 NH, 2009 NA, 2009 MX6, 2009 MN8, 2009 ML1, 2009 LS, 2009 DN1
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2009-O20 -- 162483
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 3 in MPEC 2009-O20 -- 2009 OC, 2009 NH, 2009 NE
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2009-O20 -- 5786
151Eschenberg Obs. in Switzerland, 4 in MPEC 2009-O20 -- 2009 OF, 2009 NJ, 2008 CM, 2002 LV
240Herrenberg Obs. in Germany, 1 in MPEC 2009-O20 -- 2000 TO64
F84Hibiscus Obs. in Tahiti, 1 in MPEC 2009-O20 -- 2009 MM8
J75La Sagra Obs. in Spain, 4 in MPEC 2009-O20 -- 65733, 52750, 24761, 5626
130Lumezzane Obs. in Italy, 10 in MPEC 2009-O20 -- 2009 OC, 2009 NL, 2009 NH, 2009 NE, 2007 LL, 2005 MC, 215442, 162483, 14402, 7822
B28Mandi Obs. in Italy, 1 in MPEC 2009-O20 -- 2009 NJ
474Mt. John Obs. in New Zealand, 1 in MPEC 2009-O20 -- 2006 KZ86
A13Naef Obs. in Switzerland, 4 in MPEC 2009-O20 -- 2009 NL, 2009 NH, 2009 KJ22, 2001 AA50
423North Ryde Obs. in New South Wales, 1 in MPEC 2009-O20 -- 68216
C495COR2-A instrument (5) aboard STEREO-A in heliocentric orbit leading Earth, 1 in MPEC 2009-O19 -- C/2009 L4
E12Siding Spring Survey (SSS) in New South Wales, 9 in MPEC 2009-O20 -- 2009 OG, 2009 MM8, 2009 MM1, 2009 MC9, 2009 MB9, 2009 KJ, 2009 CQ5, 17274, 4015
2492LASCO Coronagraph 2 (SOHO C2) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 17 in MPECs 2009-O18, 2009-O19, 2009-O21 & 2009-O22 -- C/2009 L9, C/2009 L8, C/2009 L7, C/2009 L6, C/2009 L5, C/2009 L4, C/2009 L3, C/2009 L15, C/2009 L14, C/2009 L13, C/2009 L12, C/2009 L11, C/2009 L10, C/2009 K14, C/2009 K13, C/2009 K12, C/2009 K11
2493LASCO Coronagraph 3 (SOHO C3) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 3 in MPECs 2009-O18 & 2009-O19 -- C/2009 L6, C/2009 L4, C/2009 K11
587Sormano Obs. in Italy, 4 in MPEC 2009-O20 -- 2009 OF, 2009 NJ, 2009 KC7, 2009 HD21
H53Thompsonville Obs. in Illinois, 2 in MPEC 2009-O20 -- 2002 LV, 5620
A48Verona Obs. in Italy, 2 in MPEC 2009-O20 -- 2009 OF, 2007 LL
198Wildberg Obs. in Germany, 2 in MPEC 2009-O20 -- 163051, 11500
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 July '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2309 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 Sentry1338203922.3e-06-3.63-3.640JPL: "Analysis based on 47 observations spanning 3.6634 days (2009-Jul-17.21281 to 2009-Jul-20.87623)." Diameter approximately 0.180 km. from mean, weighted H=21.3.
NEODyS1338203922.44e-06-3.61-3.630NEODyS: "Based on 47 optical observations (of which 1 are rejected as outliers) from 2009/07/17.214 to 2009/07/20.877."

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 21 July '09

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

2310Grabbed MPEC 2009-O21 - Comets C/2009 L7, 2009 L8, 2009 L9, 2009 L10, 2009 L11 (SOHO) - see above
Grabbed MPEC 2009-O22 - Comets C/2009 L12, 2009 L13, 2009 L14, 2009 L15 (SOHO) - see above
1338Noted 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-O20 - Daily Orbit Update - see above
0251Grabbed MPEC 2009-O18 - Comets C/2009 K11, 2009 K12, 2009 K13, 2009 K14 (SOHO) - see above
Grabbed MPEC 2009-O19 - Comets C/2009 L3, 2009 L4, 2009 L5, 2009 L6 (SOHO) - see above