Contents  on 7 September '07

Resources:

The latest news: framed access (best), RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site.

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 this year 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.

Minor-Object News  on 7 September '07

Minor-Object Science  on 7 September '07

NEOCP Activity  on 7 September '07

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

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new listing. This was a "one nighter." So far Major News has counted a total of two objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs  on 7 September '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2007-R31 - "16:32 UT" - Comet 139P/Vaisala-Oterma


<< DOU on 7 Sept. '07 >>  MPEC 2007-R30 - "06:07 UT" - Daily Orbit Update

Observers  on 7 September '07

Fourteen observing facilities appear in today's MPECs.

CodeObserver / observatory
A88Bolzaneto Obs. in Italy, 1 in MPEC 2007-R30 -- 2007 LR32
215Buchloe Obs. in Germany, 1 in MPEC 2007-R31 -- 139P
F653FTP education program via Faulkes Telescope North in Hawaii, 1 in MPEC 2007-R30 -- 2007 GS3
J95Great Shefford Obs. in England, 1 in MPEC 2007-R30 -- 2007 RS1
B19Iluro Obs. in Spain, 1 in MPEC 2007-R30 -- 2007 PU11
699LONEOS in Arizona, 1 in MPEC 2007-R30 -- 4183
809|program code {|} via La Silla in Chile, 1 in MPEC 2007-R30 -- 2007 FV42
A24New Millennium Obs. in Italy, 4 in MPEC 2007-R30 -- 86039, 154453, 154007, 4257
B38Santa Mama Obs. in Italy, 4 in MPEC 2007-R30 -- 2007 QK2, 2003 SW222, 138883, 105140
D21Shenton Park Obs. in Western Australia, 1 in MPEC 2007-R30 -- 2007 PP6
A78Stia Obs. in Italy, 2 in MPEC 2007-R30 -- 2007 QA2, 2007 PQ
6735Jim Young via Table Mtn. Obs. in southern California, 5 in MPEC 2007-R30 -- 2007 RJ1, 2007 RH1, 2007 RF2, 2007 RE1, 2007 RD1
B42Vitebsk Obs. in Belarus, 1 in MPEC 2007-R31 -- 139P
244geocentric occultation observation, 1 in MPEC 2007-R30 -- 433

Impact Risk Monitoring  on 7 September '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2354 and JPL at 2355 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now usually the year 2090.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) risk pages.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2007 RS1JPL1412R E M O V E DJPL: Risk listing removed at 0956 UTC.
NEODyS1412R E M O V E D
2007 RF2NEODyS14522010-2089689.5e-08-4.27-4.610NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2007/09/05.414 to 2007/09/06.474."
JPL14122015-21072831.3e-06-3.41-4.190JPL: "Analysis based on 20 observations spanning 1.0600 days (2007-Sep-05.41331 to 2007-Sep-06.473264)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
2007 RE1NEODyS14132031-207691.87e-07-5.17-5.530NEODyS: "Based on 32 optical observations (of which 0 are rejected as outliers) from 2007/09/02.405 to 2007/09/06.439."
JPL14122031-210581.6e-07-5.21-5.570JPL: "Analysis based on 32 observations spanning 4.0335 days (2007-Sep-02.40469 to 2007-Sep-06.43819)." Diameter approximately 0.141 km. from mean, weighted H=22.0.

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 an 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" for more about this.

Chronology  on 7 September '07

Times are UTC for when the items were noted or added by Major News.

1844Grabbed MPEC 2007-R31 - Comet 139P/Vaisala-Oterma - see above
1452Noted that NEODyS has updated its 2007 RF2 risk assessment - see above
1413Noted that NEODyS has updated its 2007 RE1 risk assessment - see above
1412Noted that JPL has updated its 2007 RE1 risk assessment - see above
Noted that JPL has updated its 2007 RF2 risk assessment - see above
Noted that JPL has removed 2007 RS1 as an impact risk - see above
Noted that NEODyS has removed 2007 RS1 as an impact risk - see above
Grabbed MPEC 2007-R30 - Daily Orbit Update - see above
0610Added link to news story, "Astronomers eager to add to Sky in Google Earth"
Added MOS paper, "Sky in Google Earth: The Next Frontier in Astronomical Data Discovery and Visualization" - see above
Added MOS paper, "Spitzer observations of the Orion OB1 association: disk census in the low mass stars" - see above
Added MOS paper, "Survival of icy grains in debris discs. The role of photosputtering" - see above
Added MOS paper, "The Dust Trail of Comet 67P/Churyumov-Gerasimenko" - see above
Added MOS paper, "The X-ray soft excess in classical T Tauri stars" - see above
Added MOS paper, "Water in Comet 2/2003 K4 (LINEAR) with Spitzer" - see above