Contents  on 24 September '07


Notes: Due to travel, these pages will update irregularly for the rest of the month.
Until September 16th this daily news page, which had included links to news and science papers as well as some occasional original reporting, was called Major News About Minor Objects. Without the news-link and science-link sections, this page was renamed as The Tracking News to more accurately reflect its continuing purpose.

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.

NEOCP Activity  on 24 September '07

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

When last checked at 2021 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new listing. Tracking News counted a total of two objects listed on the NEOCP at some point on this day.

New MPECs  on 24 September '07

Minor Planet Electronic Circulars

There were two MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-S47 - "17:04 UT" - 2007 SE11

<< DOU on 24 Sept. '07 >>  MPEC 2007-S46 - "06:10 UT" - Daily Orbit Update

Observers  on 24 September '07

Ten observing facilities appeared in this day's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 4 in MPEC 2007-S46 -- 2007 SJ, 2007 RZ19, 2007 RV12, 2007 RG1
I77CEAMIG-REA in Brazil, 1 in MPEC 2007-S47 -- 2007 SE11
F84Hibiscus Obs. in Tahiti, 2 in MPEC 2007-S46 -- 2007 RA9, 2007 PQ9
987Isle of Man Obs. on the Isle of Man, 1 in MPEC 2007-S46 -- 152787
A24New Millennium Obs. in Italy, 1 in MPEC 2007-S46 -- 2007 PU11
473Remanzacco Obs. in Italy, 2 in MPEC 2007-S46 -- 2007 SQ6, 1998 SD15
E12Siding Spring Survey in New South Wales, 1 in MPEC 2007-S47 -- 2007 SE11
A78Stia Obs. in Italy, 3 in MPEC 2007-S46 -- 2007 RR12, 2002 SV, 1998 SD15
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-S46 -- 2007 SQ6
F85Tiki Obs. in Tahiti, 2 in MPECs 2007-S46 & 2007-S47 -- 2007 SE11, 2004 ET21

Impact Risk Monitoring  on 24 September '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2021 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.





Notes for Today's Latest Risk Assessments
2007 SQ6JPL1333R E M O V E DJPL #2 for the day: Risk listing removed at 1029 UTC.
2007 SN6NEODyS13332022-208545.5e-06-4.58-4.620NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2007/09/19.290 to 2007/09/23.357."
JPL01322022-205924.8e-06-4.66-4.710JPL: "Analysis based on 15 observations spanning 4.0674 days (2007-Sep-19.28894 to 2007-Sep-23.35638)." Diameter approximately 0.036 km. from mean, weighted H=24.9.
2007 SJJPL13332017-2105465.8e-07-1.83-2.060JPL: "Analysis based on 43 observations spanning 6.0011 days (2007-Sep-17.18208 to 2007-Sep-23.183194)." Diameter approximately 1.800 km. from mean, weighted H=16.4.
NEODyS13332014-2078186.52e-07-1.73-2.150NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2007/09/17.183 to 2007/09/23.184."

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 24 September '07

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

1706Grabbed MPEC 2007-S47 - 2007 SE11 - see above
1333Noted that JPL has updated its 2007 SJ risk assessment - see above
Noted that NEODyS has updated its 2007 SJ risk assessment - see above
Noted that NEODyS has posted 2007 SN6 as an impact risk - see above
Noted that JPL has removed 2007 SQ6 as an impact risk - see above
Grabbed MPEC 2007-S46 - Daily Orbit Update - see above
0132Noted that JPL has posted 2007 SN6 as an impact risk - see above
Noted that JPL has posted 2007 SQ6 as an impact risk - see above