Mt. Wilson media towers on Aug. 31st in wildfire smoke. 
Image (c) UCLA Dept. of Physics & Astronomy.

Mt. Wilson Observatory in southern California was without staff or fire fighters as it was feared the "Station" wild fire could overwhelm the mountain top yesterday. This image, from the 150-ft. (50-meter) Solar Tower Telescope webcam at 3:12pm Monday, shows thick smoke to the west, beyond broadcast towers. See observatory and university fire reports here and here and news published here and here. Image ©Copyright 2009 UCLA Dept. of Physics & Astronomy. Update: L.A. Times report.

Contents  on 1 September '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.

Radar Astrometry  on 1 September '09

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 1319 UTC when the database was dated 31 Aug.

NEOCP Activity  on 1 September '09

The MPC's NEO Confirmation Page has 1 listing: 1 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one updated listing. 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 1 September '09

Minor Planet Electronic Circulars

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

MPEC 2009-R02 - "16:53 UT" - Comet C/2009 Q5 (McNaught)

<< DOU on 1 Sept. '09 >>  MPEC 2009-R01 - "06:08 UT" - Daily Orbit Update

Observers  on 1 September '09

A total of 30 observing facilities appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2009-R01 -- 154244
H55Astronomical Research Obs. (ARO) in Illinois, 4 in MPECs 2009-R01 & 2009-R02 -- 2009 QR8, 2009 QN5, 2009 QK9, C/2009 Q5
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2009-R01 -- 2009 QB35
B88Bigmuskie Obs. in Italy, 2 in MPEC 2009-R01 -- 163051, 11500
I77CEAMIG-REA in Brazil, 1 in MPEC 2009-R02 -- C/2009 Q5
160Castelmartini Obs. in Italy, 4 in MPEC 2009-R01 -- 2009 NE, 138925, 12711, 2100
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2009-R01 -- 2009 OC, 1943
113Drebach Obs. in Germany, 1 in MPEC 2009-R02 -- C/2009 Q5
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2009-R02 -- C/2009 Q5
F65Faulkes Telescope North in Hawaii, 1 in MPEC 2009-R02 -- C/2009 Q5
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2009 KC3
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2009-R01 -- 2009 QK9
A17Guidestar Obs. in Germany, 2 in MPECs 2009-R01 & 2009-R02 -- 2009 QC36, C/2009 Q5
704LINEAR in New Mexico, 6 in MPEC 2009-R01 -- 2009 NA, 2005 EO1, 141765, 136618, 7358, 3200
560Madonna di Dossobuono Obs. in Italy, 5 in MPEC 2009-R01 -- 2009 QJ9, 2009 QC36, 2009 MC9, 2005 MC, 1998 SV4
118Modra Obs. in Slovakia, 1 in MPEC 2009-R01 -- 2009 NE
900Moriyama Obs. in Japan, 1 in MPEC 2009-R01 -- 1943
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2009-R01 -- 2009 OC, 2009 NH, 2009 NA, 2009 LX
H06RAS Obs. Mayhill in New Mexico, 1 in MPEC 2009-R02 -- C/2009 Q5
D90RAS Obs. Moorook in South Australia, 1 in MPEC 2009-R02 -- C/2009 Q5
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-R02 -- C/2009 Q5
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-R01 & 2009-R02 -- C/2009 Q5, 2002 RQ25
H85Silver Spring Obs. in Maryland, 2 in MPEC 2009-R01 -- 2009 QG2, 2009 QC23
A97Stammersdorf Obs. in Austria, 3 in MPEC 2009-R01 -- 2009 QJ9, 163697, 433
A71Stixendorf Obs. in Austria, 1 in MPEC 2009-R02 -- C/2009 Q5
H53Thompsonville Obs. in Illinois, 1 in MPEC 2009-R01 -- 2009 NE
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2009-R02 -- C/2009 Q5
6892Hugh C. Harris via U.S. Naval Obs. Flagstaff Station in Arizona, 1 in MPEC 2009-R01 -- 433
A48Verona Obs. in Italy, 2 in MPEC 2009-R01 -- 2009 QJ9, 2009 QH2
B42Vitebsk Obs. in Belarus, 1 in MPEC 2009-R02 -- C/2009 Q5
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 September '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 QB35NEODyS13182055-206731.7e-10-7.27-7.480NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2009/08/28.344 to 2009/08/31.107."
JPL Sentry1318R E M O V E DJPL: Risk listing removed at 0848 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 1 September '09

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

1712Grabbed MPEC 2009-R02 - Comet C/2009 Q5 (McNaught) - see above
1319Noted Radar Astrometry database update - see above
1318Noted that JPL Sentry has removed 2009 QB35 as an impact risk - see above
Noted that NEODyS has updated its 2009 QB35 risk assessment - see above
Grabbed MPEC 2009-R01 - Daily Orbit Update - see above