Cabeus-A crater on the Moon 
Image from NMSU Tortugas Obs.

NASA's LCROSS mission, now dedicated to the late Walter Cronkite, has announced the selection of the lunar south polar crater Cabeus A to be the target for a two-stage impact at 4:30am PDT (1130 UTC) October 9th. Amateur and casual observers are invited to participate with 10" telescope or larger (finder charts, more info here and here). Image courtesy of New Mexico State Univ. Tortugas Observatory.


Contents  on 13 September '09

Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

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 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.

NEOCP Activity  on 13 September '09

The MPC's NEO Confirmation Page has 5 listings: 2 new, 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two new and three updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of ten listings on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 13 September '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-R53 - "21:23 UT" - 2009 RV1


MPEC 2009-R52 - "21:19 UT" - 2009 RU1


MPEC 2009-R51 - "21:16 UT" - 2009 RT1


<< DOU on 13 Sept. '09 >>  MPEC 2009-R50 - "06:07 UT" - Daily Orbit Update

Observers  on 13 September '09

A total of 25 observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2009-R50 -- 2009 KC3
H55Astronomical Research Obs. (ARO) in Illinois, 14 in MPECs 2009-R50 & 2009-R51 -- 2009 RT1, 2009 RR, 2009 RN, 2009 RH, 2009 RD1, 2009 QT, 2009 QG34, 2009 QF34, 2009 QF31, 2009 QB36, 2009 QA35, 2009 PH, 2009 OC3, 2004 FG1
J51Atlante Obs. in the Canary Islands, 3 in MPEC 2009-R50 -- 2009 NH, 2009 ML1, 2009 MC9
235CAST Obs. in Italy, 1 in MPEC 2009-R52 -- 2009 RU1
160Castelmartini Obs. in Italy, 2 in MPEC 2009-R50 -- 54401, 16834
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2009-R50 & 2009-R52 -- 2009 RU1, 2008 JO
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPECs 2009-R51 & 2009-R52 -- 2009 RU1, 2009 RT1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2009-R51, 2009-R52 & 2009-R53 -- 2009 RV1, 2009 RU1, 2009 RT1
I21El Condor Obs. in Argentina, 3 in MPEC 2009-R50 -- 2009 QL8, 2009 QJ9, 68216
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2009-R52 -- 2009 RU1
J95Great Shefford Obs. in England, 5 in MPECs 2009-R50, 2009-R51, 2009-R52 & 2009-R53 -- 2009 RV1, 2009 RU1, 2009 RT1, 2009 RR, 2009 RN
442Gualba Obs. in Spain, 1 in MPEC 2009-R50 -- 217796
A17Guidestar Obs. in Germany, 2 in MPEC 2009-R50 -- 2009 RN, 2002 TE66
704LINEAR in New Mexico, 5 in MPEC 2009-R50 -- 218863, 17511, 17274, 163697, 433
J75La Sagra Obs. in Spain, 1 in MPEC 2009-R50 -- 217683
844Los Molinos Obs. in Uruguay, 1 in MPEC 2009-R50 -- 2009 RD1
J46Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2009-R50 -- 433
J93Mt. Tuffley Obs. in England, 3 in MPEC 2009-R50 -- 17274, 1943, 433
D90.Cristovao Jacques in Brazil via RAS Obs. Moorook in South Australia, 2 in MPECs 2009-R51 & 2009-R53 -- 2009 RV1, 2009 RT1
D90`K. Hills via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-R51 -- 2009 RT1
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2009-R51 -- 2009 RT1
H36Sandlot Obs. in Kansas, 2 in MPECs 2009-R52 & 2009-R53 -- 2009 RV1, 2009 RU1
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2009-R50 & 2009-R51 -- 2009 RT1, 42286, 143651
587Sormano Obs. in Italy, 1 in MPEC 2009-R52 -- 2009 RU1
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2009-R50 & 2009-R53 -- 2009 RV1, 17511
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2009-R50 -- 2009 PQ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 September '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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
2009 RRJPL Sentry16542102-2108112.5e-06-6.08-6.830JPL: "Analysis based on 20 observations spanning 1.8608 days (2009-Sep-11.18242 to 2009-Sep-13.04322)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS1654R E M O V E D-
2009 RNJPL Sentry16542091-210771.1e-08-5.80-6.020JPL: "Analysis based on 36 observations spanning 2.0685 days (2009-Sep-11.00009 to 2009-Sep-13.06858)." Diameter approximately 0.370 km. from mean, weighted H=19.8.
NEODyS1654R E M O V E D-

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 a variant 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" to learn more.

Chronology  on 13 September '09

Times are UTC for when items were noted or added by The Tracking News.

2208Grabbed MPEC 2009-R51 - 2009 RT1 - see above
Grabbed MPEC 2009-R52 - 2009 RU1 - see above
Grabbed MPEC 2009-R53 - 2009 RV1 - see above
1654Noted that JPL Sentry has updated its 2009 RN risk assessment - see above
Noted that NEODyS has removed 2009 RN as an impact risk - see above
Noted that JPL Sentry has updated its 2009 RR risk assessment - see above
Noted that NEODyS has removed 2009 RR as an impact risk - see above
Grabbed MPEC 2009-R50 - Daily Orbit Update - see above