951 Gaspra on 29 Oct. 1991 from 
Galileo. Credit: NASA/JPL.

On this day sixteen years ago, the Jupiter-bound NASA Galileo spacecraft performed the first-ever asteroid flyby, passing 951 Gaspra, which is seen here in exaggerated color. Credit: NASA/JPL.

Contents  on 29 October '07


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

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 29 October '07

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

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." So far The Tracking News has counted a total of five 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 29 October '07

Minor Planet Electronic Circulars

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

MPEC 2007-U85 - "17:43 UT" - 1990 UO = 2007 UV3

MPEC 2007-U84 - "16:38 UT" - 2007 UN12

MPEC 2007-U83 - "15:53 UT" - 2007 UM12

MPEC 2007-U82 - "15:50 UT" - 2007 UL12

<< DOU on 29 Oct. '07 >>  MPEC 2007-U81 - "06:09 UT" - Daily Orbit Update

Observers  on 29 October '07

A total of 20 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 6 in MPECs 2007-U81, 2007-U82, 2007-U83 & 2007-U84 -- 2007 UN12, 2007 UM12, 2007 UL12, 2007 UC2, 2007 TD66, 2007 RU17
170Begues Obs. in Spain, 1 in MPEC 2007-U81 -- 2007 UT
703Catalina Sky Survey in Arizona, 1 in MPEC 2007-U84 -- 2007 UN12
734Farpoint Obs. in Kansas, 1 in MPEC 2007-U84 -- 2007 UN12
143Gnosca Obs. in Switzerland, 1 in MPEC 2007-U84 -- 2007 UN12
651Grasslands Obs. in Arizona, 1 in MPEC 2007-U84 -- 2007 UN12
J95Great Shefford Obs. in England, 2 in MPECs 2007-U83 & 2007-U84 -- 2007 UN12, 2007 UM12
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-U81 -- 2007 TG15
A17Guidestar Obs. in Germany, 1 in MPEC 2007-U84 -- 2007 UN12
704LINEAR in New Mexico, 1 in MPEC 2007-U84 -- 2007 UN12
A80Lindenberg Obs. in Germany, 3 in MPECs 2007-U81 & 2007-U84 -- 2007 UN12, 2007 TG15, 2007 LR32
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2007-U81 & 2007-U83 -- 2007 UY1, 2007 UM12, 2007 TH72
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2007-U82, 2007-U83, 2007-U84 & 2007-U85 -- 2007 UN12, 2007 UM12, 2007 UL12, 1990 UO
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2007-U81 -- 2007 RF5, 2007 PU11, 2002 RC118, 2212
204Schiaparelli Obs. in Italy, 1 in MPEC 2007-U84 -- 2007 UN12
D21Shenton Park Obs. in Western Australia, 2 in MPEC 2007-U81 -- 2007 UT, 2007 TR65
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2007-U81 & 2007-U83 -- 2007 UM12, 2340
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2007-U84 -- 2007 UN12
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-U84 -- 2007 UN12
926Tenagra II Obs. in Arizona, 5 in MPEC 2007-U81 -- 2007 UC2, 2007 TU24, 2007 RW17, 2007 RV19, 2007 RU17

Impact Risk Monitoring  on 29 October '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2027 and JPL at 2354 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 UN12JPL Sentry23542049-2107211.7e-04-6.03-6.870JPL: "Analysis based on 55 observations spanning 4.0283 days (2007-Oct-21.37247 to 2007-Oct-25.40077)." Diameter approximately 0.006 km. from mean, weighted H=28.7.
2007 UL12JPL Sentry20272094-210633.0e-09-6.08-6.140JPL: "Analysis based on 22 observations spanning 2.7800 days (2007-Oct-25.47694 to 2007-Oct-28.256955)." Diameter approximately 0.300 km. from mean, weighted H=20.3.
2007 UY1JPL Sentry12052093-210721.6e-09-8.18-8.410JPL: "Analysis based on 43 observations spanning 10.004 days (2007-Oct-18.14415 to 2007-Oct-28.14774)." Diameter approximately 0.094 km. from mean, weighted H=22.8.
2007 TH72NEODyS14312082-208726.62e-09-7.89-7.920NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2007/10/15.204 to 2007/10/28.219."
JPL Sentry1205R E M O V E DJPL: Risk listing removed at 1027 UTC.
2007 TU24JPL Sentry12052095-210424.2e-07-4.41-4.460JPL: "Analysis based on 68 observations spanning 16.955 days (2007-Oct-11.26838 to 2007-Oct-28.22359)." Diameter approximately 0.320 km. from mean, weighted H=20.1.

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 a variant 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" to learn more.

Chronology  on 29 October '07

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

2354Noted that JPL Sentry has posted 2007 UN12 as an impact risk - see above
2027Noted that JPL Sentry has posted 2007 UL12 as an impact risk - see above
Grabbed MPEC 2007-U85 - 1990 UO = 2007 UV3 - see above
1717Grabbed MPEC 2007-U84 - 2007 UN12 - see above
1641Grabbed MPEC 2007-U82 - 2007 UL12 - see above
Grabbed MPEC 2007-U83 - 2007 UM12 - see above
1431Noted that NEODyS has updated its 2007 TH72 risk assessment - see above
Noted that NEODyS has removed 2007 TU24 as an impact risk - see above
1205Noted that JPL Sentry has removed 2007 TH72 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 TU24 risk assessment - see above
Noted that JPL Sentry has updated its 2007 UY1 risk assessment - see above
Grabbed MPEC 2007-U81 - Daily Orbit Update - see above