Tiny intruder 2007 RS1 on 4 Sept. 
(c)Copyright 2007 Great Shefford Obs.

From Peter Birtwhistle, this image of 2007 RS1 is "a stack of 40 four-second exposures. With the object moving at 244"/min., it appears as a trail 16" long moving toward the upper left. At the time it was at a distance of about 213,400 km., or 0.55 lunar distance (LD), on its way to passing the Earth at 0.19 LD less than six hours later." See his story below. Details: 2007 Sept. 04 20:33:57-20:38:34 UT, moving in P.A. 45.6°, north up, binned 2x2, scale 2.15"/pixel, 0.40 f/6 Schmidt-Cassegrain. ©Copyright 2007 Great Shefford Observatory.

Contents  on 8 September '07


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.

Minor-Object News  on 8 September '07

Minor-Object Science  on 8 September '07

No science papers are known or prepared yet today.

NEOCP Activity  on 8 September '07

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

When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and one updated listings. Of these, three were "one nighters." So far Major News has counted a total of six 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 8 September '07

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-R33 - "20:09 UT" - 2007 RN7

<< DOU on 8 Sept. '07 >>  MPEC 2007-R32 - "06:07 UT" - Daily Orbit Update

Observers  on 8 September '07

Eight observing facilities appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey in Arizona, 1 in MPEC 2007-R33 -- 2007 RN7
151Eschenberg Obs. in Switzerland, 4 in MPEC 2007-R32 -- 2007 PE8, 2001 QC34, 2000 RW37, 1999 JU3
J95Great Shefford Obs. in England, 6 in MPEC 2007-R32 -- 2007 RT1, 2007 RJ1, 2007 RG2, 2007 RF5, 2007 RE2, 2007 RE1
A24New Millennium Obs. in Italy, 5 in MPEC 2007-R32 -- 40267, 154453, 145656, 138883, 4257
A32Panker Obs. in Germany, 1 in MPEC 2007-R32 -- 2007 PF28
H45Petit Jean Mtn. South Obs. in Arkansas, 5 in MPEC 2007-R32 -- 2007 PE8, 2007 LR32, 2003 SW222, 1999 JU3, 16636
E12Siding Spring Survey in New South Wales, 3 in MPEC 2007-R32 -- 2007 LV, 66959, 42286
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-R33 -- 2007 RN7

Impact Risk Monitoring  on 8 September '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2356 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 RE1JPL14232034-203821.1e-08-6.39-6.610JPL: "Analysis based on 34 observations spanning 5.5648 days (2007-Sep-02.40469 to 2007-Sep-07.96951)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
NEODyS14232034-203821.43e-08-6.29-6.530NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2007/09/02.405 to 2007/09/07.970."

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 8 September '07

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

2202Grabbed MPEC 2007-R33 - 2007 RN7 - see above
1700Added A/CC news report, "Asteroid shadows cross U.S."
Added link to news story, "Dawn ELV Status Report" - see above
1436Added A/CC news report, "Catching 2007 RS1"
1423Noted that JPL has updated its 2007 RE1 risk assessment - see above
Noted that NEODyS has updated its 2007 RE1 risk assessment - see above
Grabbed MPEC 2007-R32 - Daily Orbit Update - see above