Deimos (left) and Phobos 
Credit: .

Today is the 130th anniversary of the first discovery of a moon around Mars, although Deimos (left) was actually found on the 12th UTC. Asaph Hall at the U.S. Naval Observatory 0.66m telescope in Washington, D.C. next discovered Phobos six days later. Probably captured asteroids, here they are shown at the same scale, with the diameter of Deimos at about 12.4 km. and Phobos 22.2 km. Composite image credit: NASA. See also JPL's Planetary Photojournal Deimos collection and Malin Space Science Systems' Deimos! page and its link to a Viking mission boulder-resolution image.

Contents  on 11 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 11 August '07

Minor-Object Science  on 11 August '07

No science papers are known or prepared yet today.

NEOCP Activity  on 11 August '07

The MPC's NEO Confirmation Page has 6 listings: 3 new, 3 updated

When last checked at 2333 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and three updated listings. Of these, three were "one nighters." So far Major News has counted a total of eleven objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see Suno Observatory's Practical guide on how to observe NEOCP object.

New MPECs  on 11 August '07

Minor Planet Electronic Circulars

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

MPEC 2007-P39 - "23:07 UT" - 2007 PE8

MPEC 2007-P38 - "18:31 UT" - 2004 TP20

MPEC 2007-P37 - "18:23 UT" - 2007 PD8

MPEC 2007-P36 - "18:20 UT" - 2007 PB8

MPEC 2007-P35 - "18:14 UT" - 2007 PA8

<< DOU on 11 Aug. '07 >>  MPEC 2007-P34 - "06:07 UT" - Daily Orbit Update

Observers  on 11 August '07

Seventeen observing facilities appear in today's MPECs.

H55Astronomical Research Obs. in Illinois, 11 in MPECs 2007-P34, 2007-P35, 2007-P36 & 2007-P38 -- 2004 TP20, 2007 PB8, 2007 PA8, 2007 PF6, 2007 LF, 2007 LD, 2007 KN4, 2007 JJ35, 2007 DZ40, 2001 RR17, 2001 LE6
J51Atlante Obs. in the Canary Islands, 3 in MPEC 2007-P34 -- 86324, 4183, 433
235CAST Obs. in Italy, 1 in MPEC 2007-P34 -- 2007 NC5
151Eschenberg Obs. in Switzerland, 1 in MPEC 2007-P39 -- 2007 PE8
734Farpoint Obs. in Kansas, 2 in MPECs 2007-P34 & 2007-P35 -- 2007 PA8, 2007 PF6
J95Great Shefford Obs. in England, 3 in MPECs 2007-P35, 2007-P36 & 2007-P39 -- 2007 PE8, 2007 PB8, 2007 PA8
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-P34 -- 2007 DT103
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2007-P34 -- 2007 LR32, 2007 DT103, 145656, 85275
704LINEAR in New Mexico, 2 in MPECs 2007-P35 & 2007-P39 -- 2007 PE8, 2007 PA8
A24New Millennium Obs. in Italy, 8 in MPEC 2007-P34 -- 152895, 86039, 53435, 5626, 3554, 3103, 1866, 1627
H45Petit Jean Mtn. South Obs. in Arkansas, 16 in MPEC 2007-P34 -- 2007 NC5, 2007 MM13, 2007 LR32, 2007 LA15, 2007 HX82, 2006 GB, 2004 ST9, 2003 RX7, 2002 NN4, 1995 LG, 145656, 87309, 86324, 85275, 68950, 24443
H68Red Barn Obs. in Georgia, 1 in MPEC 2007-P34 -- 85275
B38Santa Mama Obs. in Italy, 5 in MPEC 2007-P34 -- 2007 NC5, 2007 MM13, 2007 LA15, 2007 CK26, 145656
204Schiaparelli Obs. in Italy, 1 in MPEC 2007-P35 -- 2007 PA8
E12Siding Spring Survey in New South Wales, 1 in MPEC 2007-P37 -- 2007 PD8
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2007-P34 & 2007-P36 -- 2007 PB8, 141874, 5879
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2007-P34 & 2007-P36 -- 2007 PB8, 2005 GE59, 2004 RD252, 2004 RF84, 2003 SW222, 2003 SU214, 2003 FS2, 2002 TD66, 2000 SB8, 2000 RN12, 2000 JA3

Impact Risk Monitoring  on 11 August '07

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2355 UTC)
See the CRT page for a list of all objects rated as risks in the last month.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2080.
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 PF6JPL14272024-2100189.4e-09-5.36-6.250JPL: "Analysis based on 28 observations spanning 2.0159 days (2007-Aug-08.20922 to 2007-Aug-10.22507)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
NEODyS14272032-2090183.51e-09-5.89-6.380NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2007/08/08.210 to 2007/08/10.226."
2007 PA8JPL23142019-2103291.5e-08-3.22-3.630JPL: "Analysis based on 16 observations spanning 1.9597 days (2007-Aug-09.21035 to 2007-Aug-11.170041)." Diameter approximately 2.047 km. from mean, weighted H=16.1.

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 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 11 August '07

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

2314Noted that JPL has posted 2007 PA8 as an impact risk - see above
Grabbed MPEC 2007-P39 - 2007 PE8 - see above
1907Grabbed MPEC 2007-P38 - 2004 TP20 - see above
1826Grabbed MPEC 2007-P35 - 2007 PA8 - see above
Grabbed MPEC 2007-P36 - 2007 PB8 - see above
Grabbed MPEC 2007-P37 - 2007 PD8 - see above
1648Added link to news story, "Of Skunks and Telescopes: Close Encounters of the UNkind"
Added link to news story, "See meteors this weekend"
Added link to news story, "Aussies might as well stay in bed"
Added link to news story, "UK gets best seats to spectacular meteor shower"
1427Noted that JPL has updated its 2007 PF6 risk assessment - see above
Noted that NEODyS has updated its 2007 PF6 risk assessment - see above
Grabbed MPEC 2007-P34 - Daily Orbit Update - see above