NASA Dawn mission launch today. 
Credit: NASA/George Shelton.

The NASA Dawn mission is on its way to the Main Belt, successfully launched this morning at 7:34am EDT (1134 UTC) from Cape Canaveral Air Force Station. Spaceflight Now reports that the last stage separation occurred at 1235 UTC, completing the launch sequence. Credit: NASA/George Shelton.

Contents  on 27 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 27 September '07

The MPC's NEO Confirmation Page has 7 listings: 1 new, 6 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and six updated listings. Of these, three were "one nighters." So far Tracking News has counted a total of ten 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 27 September '07

Minor Planet Electronic Circulars

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

MPEC 2007-S60 - "19:20 UT" - 2007 SP11

<< DOU on 27 Sept. '07 >>  MPEC 2007-S59 - "06:10 UT" - Daily Orbit Update

Observers  on 27 September '07

Eight observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 8 in MPEC 2007-S59 -- 2007 SW2, 2007 SR1, 2007 RZ8, 2007 RT146, 2007 RR17, 2007 RQ133, 2007 RG2, 2005 YY36
670Camarillo Obs. in southern California, 3 in MPEC 2007-S59 -- 2007 PU11, 2007 PE8, 21277
J95Great Shefford Obs. in England, 2 in MPEC 2007-S59 -- 2007 SV1, 2007 SU1
H51Greiner Research Obs. in Wisconsin, 2 in MPEC 2007-S59 -- 2007 RR12, 2007 PU11
G96Mt. Lemmon Survey in Arizona, 2 in MPECs 2007-S59 & 2007-S60 -- 2007 SP11, 89830
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2007-S59 -- 2004 XK35
6735Jim Young via Table Mtn. Obs. in southern California, 4 in MPEC 2007-S59 -- 2007 SW2, 2007 SU1, 2007 SG11, 2007 RR17
G72University Hills Obs. in southern California, 2 in MPEC 2007-S59 -- 2007 RR12, 2007 LR32

Impact Risk Monitoring  on 27 September '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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 SP11JPL23582013-2106862.6e-07-3.50-4.120JPL: "Analysis based on 12 observations spanning 2.0272 days (2007-Sep-25.46397 to 2007-Sep-27.49121)." Diameter approximately 0.560 km. from mean, weighted H=18.9.

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 27 September '07

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

2358Noted that JPL has posted 2007 SP11 as an impact risk - see above
2027Grabbed MPEC 2007-S60 - 2007 SP11 - see above
1510Grabbed MPEC 2007-S59 - Daily Orbit Update - see above