Pieces of comet 73P/Schwassmann-Wachmann 
from the Spitzer Space Telescope in 2006. 
Image credit: NASA/JPL-Caltech/W. Reach. 
Annotation (c)Copyright Great Shefford Obs.

Sorting out broken comet 73P/Schwassmann-Wachmann, Peter Birtwhistle has correlated ground-based astrometry with a mosaic of Spitzer Space Telescope imagery from 4-6 May 2006, rotated to horizontal perihelion order with earlier to the left. This small detail comes from the right of the second brightest piece, fragment B (not shown). See more info below. Image credit: NASA/JPL-Caltech/W. Reach. Annotation ©Copyright Great Shefford Observatory, used with permission.

Contents  on 22 August '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 22 August '07

Minor-Object Science  on 22 August '07

NEOCP Activity  on 22 August '07

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

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six new and one updated listings. Of these, six were "one nighters." So far Major News has counted a total of eight 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 22 August '07

Minor Planet Electronic Circulars

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

MPEC 2007-Q16 - "14:23 UT" - 2007 QK2

<< DOU on 22 Aug. '07 >>  MPEC 2007-Q15 - "06:09 UT" - Daily Orbit Update

Observers  on 22 August '07

Nine observing facilities appear in today's MPECs.

CodeObserver / observatory
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2007-Q15 -- 2007 PF28
127Bornheim Obs. in Germany, 1 in MPEC 2007-Q15 -- 16636
734Farpoint Obs. in Kansas, 1 in MPEC 2007-Q16 -- 2007 QK2
F84Hibiscus Obs. in Tahiti, 1 in MPEC 2007-Q16 -- 2007 QK2
474Mt. John Obs. in New Zealand, 1 in MPEC 2007-Q16 -- 2007 QK2
A24New Millennium Obs. in Italy, 16 in MPEC 2007-Q15 -- 2007 DB83, 86039, 40267, 154555, 154453, 154007, 152895, 145656, 5626, 4544, 4257, 4055, 3554, 3103, 1866, 1627
H06*Rolando Ligustri in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-Q16 -- 2007 QK2
H062Robert Hutsebaut in Belgium via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2007-Q15 -- 2007 PF28
D21Shenton Park Obs., 1 in MPEC 2007-Q15 -- 2007 PV27
E12Siding Spring Survey in New South Wales, 3 in MPECs 2007-Q15 & 2007-Q16 -- 2007 QK2, 2007 CK26, 2005 GG

Impact Risk Monitoring  on 22 August '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS 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 PV27JPL13582037-206464.0e-07-4.00-4.210JPL: "Analysis based on 38 observations spanning 7.0964 days (2007-Aug-14.56587 to 2007-Aug-21.66226)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
NEODyS13582050-2082115.12e-07-3.92-4.190NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2007/08/14.567 to 2007/08/21.663."

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 August '07

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

1927Added news report, "Bits & pieces"
Added news report, "Comet piece work"
Added link to news story, "Hubble Teams with Google to Bring the Cosmos Down to Earth"
Added link to news story, "HAWK-I Takes Off"
Added link to news story, "Plasma Rocket Engine: New Agreement Inked"
Added link to news story, "Testing Radon Anomalies on The Carswell Project"
Added link to news story, "Heavens above, now Google reaches for the stars"
Added link to news story, "Google Earth Gets Cosmic Addition"
1511Grabbed MPEC 2007-Q16 - 2007 QK2 - see above
1358Noted that JPL has updated its 2007 PV27 risk assessment - see above
Noted that NEODyS has updated its 2007 PV27 risk assessment - see above
Grabbed MPEC 2007-Q15 - Daily Orbit Update - see above
0549Added MOS paper, "Apollo asteroids (1566) Icarus and 2007 MK6: Icarus family members?" - see above
Added MOS paper, "Brown dwarf formation by gravitational fragmentation of massive, extended protostellar discs" - see above
Added link to news story, "Strange Asteroids Baffle Scientists"