19P/Borrelly from DS-1 on 22 Sept. 
2001. Credit: NASA/JPL.

On this day six years ago, the NASA Deep Space 1 spacecraft flew past the nucleus of comet 19P/Borrelly, which, as seen in this best image, was found to be about 10 km. long. Credit: NASA/JPL.

Contents  on 22 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 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 22 September '07

The MPC's NEO Confirmation Page has 9 listings: 1 new, 8 updated

When last checked at 2347 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and eight updated listings. Of these, two were "one nighters."

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 22 September '07

Minor Planet Electronic Circulars

As of last check at 2347 UTC, there has been one MPEC issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 22 Sept. '07 >>  MPEC 2007-S40 - "06:10 UT" - Daily Orbit Update

Observers  on 22 September '07

Ten observing facilities appear in today's MPEC.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 7 in MPEC 2007-S40 -- 2007 SW2, 2007 SV1, 2007 SJ, 2007 RY19, 2007 RT146, 2007 RS17, 2007 RQ17
703Catalina Sky Survey in Arizona, 1 in MPEC 2007-S40 -- 21374
J65Celbridge Obs. in Ireland, 4 in MPEC 2007-S40 -- 2007 PU11, 2002 SV, 1999 JU3, 1998 SD15
113Drebach Obs. in Germany, 2 in MPEC 2007-S40 -- 1999 JU3, 1998 SD15
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-S40 -- 2007 PU11, 2007 LR32, 2002 SV, 1998 SD15
695[program code "[" via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2007-S40 -- 2007 RY19
704LINEAR in New Mexico, 7 in MPEC 2007-S40 -- 2007 RF5, 2007 PU11, 2007 LQ19, 2005 SG, 2002 RT129, 1988 PA, 143678
130Lumezzane Obs. in Italy, 6 in MPEC 2007-S40 -- 2007 OV, 2004 OT11, 2001 SA270, 2000 RW37, 20826, 5786
E12Siding Spring Survey in New South Wales, 13 in MPEC 2007-S40 -- 2007 SU1, 2007 SS1, 2007 SJ, 2007 RY9, 2007 RX19, 2007 RV19, 2007 PR9, 2007 LA15, 2007 DT103, 2002 SV, 1998 VR, 136849, 3753
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2007-S40 -- 2007 RU17, 2002 RT129

Impact Risk Monitoring  on 22 September '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2348 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 SJNEODyS13522014-2085257.06e-07-1.58-2.130NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2007/09/17.183 to 2007/09/21.454."
JPL13512017-2105394.1e-07-1.88-2.130JPL: "Analysis based on 37 observations spanning 4.2707 days (2007-Sep-17.18208 to 2007-Sep-21.45275)." Diameter approximately 1.900 km. from mean, weighted H=16.3.
2007 RY19NEODyS13522024-2089512.76e-05-3.56-3.880NEODyS: "Based on 37 optical observations (of which 0 are rejected as outliers) from 2007/09/14.354 to 2007/09/21.351."
JPL13512024-2106716.5e-05-3.25-3.860JPL: "Analysis based on 37 observations spanning 6.9978 days (2007-Sep-14.35284 to 2007-Sep-21.350609)." Diameter approximately 0.110 km. from mean, weighted H=22.4.

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 22 September '07

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

1352Noted that NEODyS has updated its 2007 RY19 risk assessment - see above
Noted that NEODyS has updated its 2007 SJ risk assessment - see above
Grabbed MPEC 2007-S40 - Daily Orbit Update - see above
1351Noted that JPL has updated its 2007 RY19 risk assessment - see above
Noted that JPL has updated its 2007 SJ risk assessment - see above