Contents  on 28 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 28 September '07

The MPC's NEO Confirmation Page has 5 listings: 1 new, 4 updated

When last checked at 2116 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and four updated listings. Of these, two were "one nighters." So far Tracking News has counted a total of seven 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 28 September '07

Minor Planet Electronic Circulars

As of last check at 2116 UTC, there have been eight MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-S68 - "14:56 UT" - PHAs

MPEC 2007-S67 - "14:56 UT" - Unusual Minor Planets

MPEC 2007-S66 - "14:56 UT" - Amors

MPEC 2007-S65 - "14:56 UT" - Atens and Apollos

MPEC 2007-S64 - "14:27 UT" - Distant Minor Planets

MPEC 2007-S63 - "14:00 UT" - Observable Comets

MPEC 2007-S62 - "12:35 UT" - 2007 SR11

<< DOU on 28 Sept. '07 >>  MPEC 2007-S61 - "06:05 UT" - Daily Orbit Update

Observers  on 28 September '07

Six observing facilities appear in today's MPECs.

CodeObserver / observatory
448Desert Moon Obs. in New Mexico, 10 in MPEC 2007-S61 -- 2007 SQ6, 2007 SP6, 2007 RX19, 2007 RV17, 2007 RU9, 2007 RR9, 2007 RF5, 2007 RD20, 2007 PA8, 66272
J95Great Shefford Obs. in England, 2 in MPECs 2007-S61 & 2007-S62 -- 2007 SR11, 2007 SQ6
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-S61 -- 2007 PU11
G96Mt. Lemmon Survey in Arizona, 3 in MPECs 2007-S61 & 2007-S62 -- 2007 SR11, 2004 TH10, 153591
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-S61 -- 2007 SV1
G72University Hills Obs. in southern California, 3 in MPEC 2007-S61 -- 2007 RR12, 2007 RF5, 2007 LR32

Impact Risk Monitoring  on 28 September '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2116 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 SR11JPL16162017-2107103.9e-08-5.60-6.090JPL: "Analysis based on 22 observations spanning 1.1249 days (2007-Sep-26.34262 to 2007-Sep-27.46749)." Diameter approximately 0.140 km. from mean, weighted H=21.9.
2007 SP11NEODyS21172008-207371.16e-07-1.93-1.930NEODyS: "Based on 12 optical observations (of which 1 are rejected as outliers) from 2007/09/25.465 to 2007/09/27.492."
2007 RU9NEODyS1450R E M O V E D
JPL1450R E M O V E DJPL: Risk listing removed at 1012 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 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 28 September '07

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

2116Noted that NEODyS has posted 2007 SP11 as an impact risk - see above
1616Noted that JPL has posted 2007 SR11 as an impact risk - see above
Grabbed MPEC 2007-S65 - Atens and Apollos - see above
Grabbed MPEC 2007-S66 - Amors - see above
Grabbed MPEC 2007-S67 - Unusual Minor Planets - see above
Grabbed MPEC 2007-S68 - PHAs - see above
1450Noted that JPL has removed 2007 RU9 as an impact risk - see above
Noted that NEODyS has removed 2007 RU9 as an impact risk - see above
Grabbed MPEC 2007-S61 - Daily Orbit Update - see above
Grabbed MPEC 2007-S62 - 2007 SR11 - see above
Grabbed MPEC 2007-S63 - Observable Comets - see above
Grabbed MPEC 2007-S64 - Distant Minor Planets - see above