Meteor trail in 8.2m telescoe imagery. 
(c)Copyright Subaru Telescope.

Unfocussed micrometeor trail caught in a Subaru 8.2-meter telescope exposure. See links to more info and images below. Copyright: Subaru Telescope.


Contents  on 11 September '07

Resources:

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 September '07

Minor-Object Science  on 11 September '07

NEOCP Activity  on 11 September '07

The MPC's NEO Confirmation Page has 9 listings: 8 new, 1 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had eight new and one updated listings. Of these, eight were "one nighters." So far Major News has counted a total of 22 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 11 September '07

Minor Planet Electronic Circulars

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


MPEC 2007-R53 - "23:09 UT" - 2007 RU10


MPEC 2007-R52 - "19:48 UT" - 2007 RY9


MPEC 2007-R51 - "16:07 UT" - 2007 RV9


MPEC 2007-R50 - "16:05 UT" - 2007 RU9


MPEC 2007-R49 - "16:02 UT" - 2007 RT9


MPEC 2007-R48 - "15:59 UT" - 2007 RS9


MPEC 2007-R47 - "15:56 UT" - 2007 RR9


MPEC 2007-R46 - "15:49 UT" - 2007 RP9


MPEC 2007-R45 - "15:26 UT" - 1998 QB28


MPEC 2007-R44 - "10:40 UT" - 2000 SY162


MPEC 2007-R43 - "10:36 UT" - 2002 RT129


<< DOU on 11 Sept. '07 >>  MPEC 2007-R42 - "06:08 UT" - Daily Orbit Update

Observers  on 11 September '07

A total of 21 observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 7 in MPEC 2007-R42 -- 2007 RT1, 2007 RO1, 2007 RJ1, 2007 RD1, 2007 PV27, 2007 NC5, 2007 LL
J51Atlante Obs. in the Canary Islands, 4 in MPEC 2007-R42 -- 2007 DT103, 21374, 16636, 7977
I77CEAMIG-REA in Brazil, 1 in MPEC 2007-R47 -- 2007 RR9
B14Ca del Monte Obs. in Italy, 3 in MPEC 2007-R42 -- 2007 PE8, 16636, 3753
703Catalina Sky Survey in Arizona, 19 in MPECs 2007-R42, 2007-R46, 2007-R47, 2007-R52 & 2007-R53 -- 2007 RY9, 2007 RU10, 2007 RT1, 2007 RR9, 2007 RP9, 2007 RJ1, 2007 KN4, 2004 TR13, 2004 RN9, 2002 RN129, 2001 QC34, 1999 JU3, 26166, 154330, 143678, 8034, 5143, 4183, 2212
151Eschenberg Obs. in Switzerland, 2 in MPECs 2007-R52 & 2007-R53 -- 2007 RY9, 2007 RU10
651Grasslands Obs. in Arizona, 3 in MPECs 2007-R46, 2007-R47 & 2007-R50 -- 2007 RU9, 2007 RR9, 2007 RP9
J95Great Shefford Obs. in England, 4 in MPECs 2007-R45, 2007-R46, 2007-R47 & 2007-R50 -- 2007 RU9, 2007 RR9, 2007 RP9, 1998 QB28
704LINEAR in New Mexico, 2 in MPEC 2007-R42 -- 143678, 1865
699LONEOS in Arizona, 2 in MPEC 2007-R42 -- 2007 DT103, 26166
A06Mataro Obs. in Spain, 1 in MPEC 2007-R47 -- 2007 RR9
G96Mt. Lemmon Survey in Arizona, 9 in MPECs 2007-R42, 2007-R45, 2007-R46, 2007-R47, 2007-R48, 2007-R49, 2007-R50 & 2007-R51 -- 2007 RV9, 2007 RU9, 2007 RT9, 2007 RS9, 2007 RR9, 2007 RP9, 1998 QB28, 5879, 1221
A24New Millennium Obs. in Italy, 1 in MPEC 2007-R42 -- 2007 PU11
423North Ryde Obs. in New South Wales, 1 in MPEC 2007-R42 -- 2007 FV42
473Remanzacco Obs. in Italy, 1 in MPEC 2007-R53 -- 2007 RU10
434San Benedetto Po Obs. in Italy, 1 in MPEC 2007-R42 -- 16636
E12Siding Spring Survey in New South Wales, 7 in MPEC 2007-R42 -- 2007 RA9, 2007 FE1, 2007 DK8, 2007 CK26, 6050, 4954, 1685
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2007-R42 -- 154330, 14402
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2007-R42, 2007-R49 & 2007-R51 -- 2007 RV9, 2007 RT9, 2007 RF2, 2007 DL41, 2006 CX, 2006 BZ147, 2004 WS2, 2004 TP1, 2002 FW5, 2000 YF29, 1999 SO5, 1999 HA2
A78Stia Obs. in Italy, 2 in MPEC 2007-R42 -- 2007 QK2, 1999 JU3
6735Jim Young via Table Mtn. Obs. in southern California, 5 in MPECs 2007-R43, 2007-R44, 2007-R46, 2007-R47 & 2007-R50 -- 2007 RU9, 2007 RR9, 2007 RP9, 2002 RT129, 2000 SY162

Impact Risk Monitoring  on 11 September '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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2007 RU9JPL21072010-21073643.7e-06-2.69-3.360JPL: "Analysis based on 22 observations spanning 1.1205 days (2007-Sep-10.28596 to 2007-Sep-11.40646)." Diameter approximately 0.243 km. from mean, weighted H=20.7.
2007 RR9JPL21072046-2107131.3e-07-4.66-5.060JPL: "Analysis based on 33 observations spanning 1.2227 days (2007-Sep-10.21237 to 2007-Sep-11.43502)." Diameter approximately 0.300 km. from mean, weighted H=20.3.
2007 RF2JPL1346R E M O V E DJPL: Risk listing removed at 0956 UTC.
2007 RA9JPL1346R E M O V E DJPL: Risk listing removed at 1115 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 11 September '07

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

2354Grabbed MPEC 2007-R53 - 2007 RU10 - see above
2107Noted that JPL has posted 2007 RR9 as an impact risk - see above
Noted that JPL has posted 2007 RU9 as an impact risk - see above
1954Grabbed MPEC 2007-R52 - 2007 RY9 - see above
1943Added A/CC news report, "Lunar impacts"
Added A/CC news report, "Distant EKOs"
Added link to news story, "Occultation by (146) Lucina on Sept. 20" - see above
Added link to news story, "Occultation by the large asteroid (704) Interamnia" - see above
Added link to news story, "Subaru Astronomers Measure Meteoroid Tunnels in Earth's Atmosphere" - see above
Added link to news story, "'Shooting Star' Trails Narrower Than A Pencil Lead" - see above
Added link to news story, "Life's Ingredients May Have 'Sprinkled' on Earth" - see above
1657Grabbed MPEC 2007-R45 - 1998 QB28 - see above
Grabbed MPEC 2007-R46 - 2007 RP9 - see above
Grabbed MPEC 2007-R47 - 2007 RR9 - see above
Grabbed MPEC 2007-R48 - 2007 RS9 - see above
Grabbed MPEC 2007-R49 - 2007 RT9 - see above
Grabbed MPEC 2007-R50 - 2007 RU9 - see above
Grabbed MPEC 2007-R51 - 2007 RV9 - see above
1419Added MOS paper, "Light-induced disassembly of dusty bodies in inner protoplanetary discs: implications for the formation of planets" - see above
Added MOS paper, "Magnetic fields and accretion flows on the classical T Tauri star V2129 Oph" - see above
Added MOS paper, "Occultation observation to probe the turbulence scale size in the plasma tail of comet Schwassmann-Wachmann 3-B" - see above
Added MOS paper, "Oligarchic planetesimal accretion and giant planet formation" - see above
Added MOS paper, "The Formation of Fragments at Corotation in Isothermal Protoplanetary Disks" - see above
Added MOS paper, "The Nature of the Dense Core Population in the Pipe Nebula: Thermal Cores Under Pressure" - see above
Added MOS paper, "The Relativistic Factor in the Orbital Dynamics of Point Masses" - see above
Added MOS paper, "Toward a Deterministic Model of Planetary Formation IV: Effects of Type-I Migration" - see above
1347Grabbed MPEC 2007-R42 - Daily Orbit Update - see above
1346Noted that JPL has removed 2007 RA9 as an impact risk - see above
Noted that JPL has removed 2007 RF2 as an impact risk - see above
Grabbed MPEC 2007-R43 - 2002 RT129 - see above
Grabbed MPEC 2007-R44 - 2000 SY162 - see above