Contents  on 5 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 5 September '07

Minor-Object Science  on 5 September '07

NEOCP Activity  on 5 September '07

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

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and three updated listings. Of these, five were "one nighters." So far Major News has counted a total of nine 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 5 September '07

Minor Planet Electronic Circulars

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


MPEC 2007-R21 - "16:55 UT" - 2007 RS1


MPEC 2007-R20 - "10:59 UT" - 2007 RT1


<< DOU on 5 Sept. '07 >>  MPEC 2007-R19 - "06:07 UT" - Daily Orbit Update

Observers  on 5 September '07

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 10 in MPEC 2007-R19 -- 2007 RH1, 2007 RG1, 2007 RF1, 2007 RE1, 2007 RD1, 2007 PP9, 2007 OH3, 2007 HX82, 2001 VG5, 1989 DA
703Catalina Sky Survey in Arizona, 5 in MPECs 2007-R19 & 2007-R20 -- 2007 RT1, 2000 RW37, 152558, 141874, 5143
448Desert Moon Obs. in New Mexico, 7 in MPEC 2007-R19 -- 2007 QE3, 2007 PQ, 2007 PP9, 2007 PA8, 2006 WW1, 2000 RW37, 152787
808El Leoncito Obs. in Argentina, 10 in MPEC 2007-R19 -- 2007 PE8, 2007 FV42, 2007 DT103, 2004 KE1, 89355, 86878, 85275, 66959, 42286, 5143
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2007-R19 -- 26166
651Grasslands Obs. in Arizona, 1 in MPEC 2007-R20 -- 2007 RT1
H51Greiner Research Obs. in Wisconsin, 1 in MPEC 2007-R19 -- 2007 PU11
379Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2007-R19 -- 2007 QE3, 2007 PU11, 2007 PE8, 2007 LR32, 2007 DT103
701Junk Bond Obs. in Arizona, 2 in MPEC 2007-R19 -- 2007 RH1, 2007 RD1
699LONEOS in Arizona, 2 in MPEC 2007-R19 -- 2007 NC5, 16636
G96Mt. Lemmon Survey in Arizona, 5 in MPECs 2007-R19, 2007-R20 & 2007-R21 -- 2007 RT1, 2007 RS1, 2007 RD1, 2003 SW222, 1998 SH36
B04Saint-Barthelemy Obs., 2 in MPECs 2007-R19 & 2007-R20 -- 2007 RT1, 2007 RJ1
B38Santa Mama Obs. in Italy, 2 in MPEC 2007-R19 -- 2004 OT11, 2002 NN4
E12Siding Spring Survey in New South Wales, 8 in MPEC 2007-R19 -- 2007 QK2, 2007 PP6, 2007 OY, 2007 OV, 2007 NS4, 2007 ML6, 2007 FV42, 137062
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-R19 -- 2007 PV27
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2007-R20 -- 2007 RT1

Impact Risk Monitoring  on 5 September '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 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 RS1JPL22402014-202535.8e-05-6.10-6.100JPL: "Analysis based on 13 observations spanning .15099 days (2007-Sep-04.24049 to 2007-Sep-04.39148)." Diameter approximately 0.003 km. from mean, weighted H=30.7.
2007 RJ1JPL1417R E M O V E DJPL: Risk listing removed at 1007 UTC.
2007 RF1JPL1417R E M O V E DJPL: Risk listing removed at 1210 UTC.
2007 RE1JPL14172019-2106463.2e-07-4.94-5.670JPL: "Analysis based on 20 observations spanning 1.7801 days (2007-Sep-02.40469 to 2007-Sep-04.184833)." Diameter approximately 0.138 km. from mean, weighted H=22.0.
NEODyS14172019-2083293.1e-07-4.97-5.680NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2007/09/02.405 to 2007/09/04.186."

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 5 September '07

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

2240Noted that JPL has posted 2007 RS1 as an impact risk - see above
2225Added link to news story, "Turbulence Key to Planet Formation, New Study Suggests" - see above
Added link to news story, "Far-Flung Crash May Have Created Dino-Killer Asteroid" - see above
Added link to news story, "New Horizons to Voyager: Happy 30th Anniversary!" - see above
Added link to news story, "Scientists implicate huge asteroid collision in death of dinosaurs" - see above
Added link to news story, "Asteroids Smash, Dinosaurs Duck" - see above
Added link to news story, "Dino-Killing Asteroid Traced to Cosmic Collision" - see above
Added link to news story, "New research reveals ... likely source of ... mass extinction event" - see above
Added link to news story, "An asteroid breakup 160 Myr ago as the probable source of the K/T impactor" - see above
1931Added A/CC news report, "Intruder - 2007 RS1"
1855Grabbed MPEC 2007-R21 - 2007 RS1 - see above
1657Added link to news story, "Aurigids Aplenty!" - see above
1431Added MOS paper, "An Improbable Solution to the Underluminosity of 2M1207B: A Hot Protoplanet Collision Afterglow" - see above
Added MOS paper, "Candidate Members and Age Estimate of the Family of Kuiper Belt Object 2003 EL61" - see above
Added MOS paper, "Cometary Dust Trail Associated with Rosetta Mission Target: 67P/Churyumov-Gerasimenko" - see above
Added MOS paper, "Magnetic Braking and Protostellar Disk Formation: The Ideal MHD Limit" - see above
Added MOS paper, "On The Orbital Evolution of Jupiter Mass Protoplanet Embedded in A Self-Gravity Disk" - see above
1418Grabbed MPEC 2007-R19 - Daily Orbit Update - see above
1417Noted that JPL has updated its 2007 RE1 risk assessment - see above
Noted that NEODyS has posted 2007 RE1 as an impact risk - see above
Noted that JPL has removed 2007 RF1 as an impact risk - see above
Noted that JPL has removed 2007 RJ1 as an impact risk - see above
Grabbed MPEC 2007-R20 - 2007 RT1 - see above