Contents  on 21 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.

Radar Astrometry  on 21 September '09

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2301 UTC when the database was dated 21 Sept.

NEOCP Activity  on 21 September '09

The MPC's NEO Confirmation Page has 8 listings: 2 new, 6 updated

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

New MPECs  on 21 September '09

Minor Planet Electronic Circulars

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


MPEC 2009-S66 - "22:19 UT" - 2009 SX17


MPEC 2009-S65 - "21:52 UT" - 2009 SW17


MPEC 2009-S64 - "21:31 UT" - 2009 SV17


<< DOU on 21 Sept. '09 >>  MPEC 2009-S63 - "06:07 UT" - Daily Orbit Update


MPEC 2009-S62 - "00:48 UT" - 2009 SK15


MPEC 2009-S61 - "00:45 UT" - 2009 SJ15


MPEC 2009-S60 - "00:41 UT" - 2009 SH15

Observers  on 21 September '09

A total of 22 observing facilities appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2009-S63 -- 2009 QB36
432Boambee Obs. in New South Wales, 3 in MPEC 2009-S63 -- 52762, 4954, 3554
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2009-S63, 2009-S65 & 2009-S66 -- 2009 SX17, 2009 SW17, 2009 QO, 2009 QG34, 2009 MC9, 55408, 17274, 163051, 152931, 8035, 1943
113Drebach Obs. in Germany, 2 in MPEC 2009-S63 -- 2002 NP1, 2002 FB6
639Dresden Obs. in Germany, 3 in MPEC 2009-S63 -- 2009 MC9, 2000 CO101, 159402
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 3 in MPECs 2009-S64, 2009-S65 & 2009-S66 -- 2009 SX17, 2009 SW17, 2009 SV17
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2000 CO101
J95Great Shefford Obs. in England, 6 in MPECs 2009-S60, 2009-S61, 2009-S62, 2009-S63 & 2009-S66 -- 2009 SX17, 2009 SN, 2009 SK15, 2009 SJ15, 2009 SH15, 2009 SH
240Herrenberg Obs. in Germany, 1 in MPEC 2009-S63 -- 54401
B15Inastars Obs. in Germany, 1 in MPEC 2009-S63 -- 1998 SV4
J28Jaen Obs. in Spain, 2 in MPEC 2009-S63 -- 2009 OC, 20790
704LINEAR in New Mexico, 9 in MPECs 2009-S60, 2009-S61, 2009-S62 & 2009-S63 -- 2009 SK15, 2009 SJ15, 2009 SH15, 2009 SG, 2002 RQ25, 52750, 38091, 218863, 20826
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2009-S63 & 2009-S64 -- 2009 SV17, 2009 SA, 2009 RH2, 2006 BC10, 2002 QG24, 163295, 152664
D90`K. Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-S63 -- 2009 SL2
I20Rio Cuarto Obs. in Argentina, 3 in MPEC 2009-S63 -- 2009 SP, 2009 RZ3, 2009 RM
H36Sandlot Obs. in Kansas, 2 in MPEC 2009-S63 -- 2009 SN, 2009 QE34
204Schiaparelli Obs. in Italy, 3 in MPEC 2009-S63 -- 2009 SX1, 2009 RA4, 2005 TG45
E12Siding Spring Survey (SSS) in New South Wales, 7 in MPEC 2009-S63 -- 2009 SL2, 2009 SH2, 2009 SG2, 2009 RH, 2009 QJ9, 2009 OB3, 2009 EC
J26Spaceguard Centre in Wales, 1 in MPEC 2009-S63 -- 1943
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2009-S63 & 2009-S64 -- 2009 SW1, 2009 SV17, 2009 SV, 2009 SU, 2009 SN1, 2009 SM1, 2009 SC, 2009 RZ3, 2009 RV1, 2009 QF34, 2009 QA35, 2006 XA, 2006 SP134
D25Tzec Maun Obs. Pingelly in Western Australia, 1 in MPEC 2009-S65 -- 2009 SW17
C00Velikie Luki Obs. in Russia, 1 in MPEC 2009-S63 -- 17274
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 SV17JPL Sentry23002067-209341.4e-09-6.21-6.710JPL: "Analysis based on 14 observations spanning 1.2897 days (2009-Sep-20.22787 to 2009-Sep-21.517556)." Diameter approximately 0.484 km. from mean, weighted H=19.2.
2009 SD15NEODyS14022066-208139.6e-07-7.03-7.040NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2009/09/19.243 to 2009/09/20.386."
2009 SC15NEODyS14022024-208638.23e-08-5.28-5.300NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2009/09/19.240 to 2009/09/20.349."
2009 SH2JPL Sentry14022090-2107184.5e-06-5.50-5.740JPL: "Analysis based on 14 observations spanning 1.9594 days (2009-Sep-18.76541 to 2009-Sep-20.72486)." Diameter approximately 0.045 km. from mean, weighted H=24.4.
NEODyS1402R E M O V E D-
2009 SN1NEODyS1402R E M O V E D-
JPL Sentry1402R E M O V E DJPL: Risk listing removed at 0930 UTC.
2009 SM1NEODyS1402R E M O V E D-
JPL Sentry1402R E M O V E DJPL: Risk listing removed at 0851 UTC.
2009 SVJPL Sentry1402R E M O V E DJPL: Risk listing removed at 0850 UTC.
2009 RZ3JPL Sentry14022044-210481.2e-08-4.55-4.930JPL: "Analysis based on 46 observations spanning 6.8811 days (2009-Sep-14.20535 to 2009-Sep-21.08642)." Diameter approximately 0.619 km. from mean, weighted H=18.7.
NEODyS14022065-209051.75e-09-5.23-5.410NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2009/09/14.206 to 2009/09/21.087."

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 21 September '09

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

2301Grabbed MPEC 2009-S66 - 2009 SX17 - see above
Noted Radar Astrometry database update - see above
2300Noted that JPL Sentry has posted 2009 SV17 as an impact risk - see above
2219Grabbed MPEC 2009-S65 - 2009 SW17 - see above
2143Grabbed MPEC 2009-S64 - 2009 SV17 - see above
1402Noted that JPL Sentry has updated its 2009 RZ3 risk assessment - see above
Noted that NEODyS has updated its 2009 RZ3 risk assessment - see above
Noted that NEODyS has posted 2009 SC15 as an impact risk - see above
Noted that NEODyS has posted 2009 SD15 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 SH2 risk assessment - see above
Noted that NEODyS has removed 2009 SH2 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SM1 as an impact risk - see above
Noted that NEODyS has removed 2009 SM1 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SN1 as an impact risk - see above
Noted that NEODyS has removed 2009 SN1 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SV as an impact risk - see above
Grabbed MPEC 2009-S63 - Daily Orbit Update - see above
0102Grabbed MPEC 2009-S60 - 2009 SH15 - see above
Grabbed MPEC 2009-S61 - 2009 SJ15 - see above
Grabbed MPEC 2009-S62 - 2009 SK15 - see above