Contents  on 19 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 19 September '09

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

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of 21 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 19 September '09

Minor Planet Electronic Circulars

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


MPEC 2009-S54 - "17:35 UT" - 2009 SL2


MPEC 2009-S53 - "12:31 UT" - 2009 SK2


MPEC 2009-S52 - "10:02 UT" - 2009 SJ2


MPEC 2009-S51 - "09:34 UT" - 2009 SH2


MPEC 2009-S50 - "09:30 UT" - 2009 SG2


MPEC 2009-S49 - "09:23 UT" - 2009 SF2


MPEC 2009-S48 - "09:19 UT" - 2009 SE2


MPEC 2009-S47 - "09:15 UT" - 2009 SC2


<< DOU on 19 Sept. '09 >>  MPEC 2009-S46 - "06:07 UT" - Daily Orbit Update


MPEC 2009-S45 - "01:48 UT" - 2009 SX1


MPEC 2009-S44 - "01:44 UT" - 2009 SW1

Observers  on 19 September '09

A total of 24 observing facilities appear in today's MPECs.

CodeObserver / observatory
834AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2009-S46 -- 159402
A50Andrushivka Obs. in the Ukraine, 2 in MPECs 2009-S45 & 2009-S49 -- 2009 SX1, 2009 SF2
H55Astronomical Research Obs. (ARO) in Illinois, 15 in MPEC 2009-S46 -- 2009 SV, 2009 SU, 2009 SQ, 2009 SM, 2009 SK, 2009 SG, 2009 SC1, 2009 RZ3, 2009 RU1, 2009 RM, 2009 RG2, 2009 RD1, 2009 RB4, 2009 QG34, 2009 QF31
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2009-S44, 2009-S45, 2009-S46 & 2009-S49 -- 2009 SX1, 2009 SW1, 2009 SF2, 2009 ML1, 2002 TE66, 2000 SO10, 1998 MR24, 55408
A77Chante-Perdrix Obs. in France, 1 in MPEC 2009-S46 -- 159402
H26Doc Greiner Research Obs. (DGRO) in Wisconsin, 4 in MPEC 2009-S46 -- 2009 SG, 2009 RA4, 2009 QB36, 2000 CO101
113Drebach Obs. in Germany, 1 in MPEC 2009-S45 -- 2009 SX1
I21El Condor Obs. in Argentina, 1 in MPEC 2009-S50 -- 2009 SG2
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2009-S45 -- 2009 SX1
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 1 in MPEC 2009-S46 -- 2009 SC1
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2009-S46 -- 2009 SJ1
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2009-S46 -- 143678
J95Great Shefford Obs. in England, 1 in MPEC 2009-S44 -- 2009 SW1
B15Inastars Obs. in Germany, 2 in MPEC 2009-S46 -- 2009 SX1, 153195
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2009-S46, 2009-S47, 2009-S48, 2009-S52 & 2009-S53 -- 2009 SK2, 2009 SJ2, 2009 SE2, 2009 SC2, 2004 RK9, 216985
I20Rio Cuarto Obs. in Argentina, 2 in MPECs 2009-S50 & 2009-S51 -- 2009 SH2, 2009 SG2
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-S49 -- 2009 SF2
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPECs 2009-S46, 2009-S50, 2009-S51 & 2009-S54 -- 2009 SL2, 2009 SH2, 2009 SG2, 2009 RY3, 2009 RT1, 2009 RD4
G68Sierra Stars Obs. in northern California, 1 in MPEC 2009-S46 -- 2009 SK1
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2009-S46 -- 2008 JO, 162998, 3288
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2009-S46, 2009-S47 & 2009-S48 -- 2009 SK, 2009 SE2, 2009 SD, 2009 SC2, 2009 SC, 2009 SB, 2009 RZ3, 2009 QO8, 2009 QO5, 2009 QM5, 2009 QF34, 2009 QA35, 2006 YT13, 2005 UK1, 2003 SM84, 2000 WC67
A97Stammersdorf Obs. in Austria, 1 in MPEC 2009-S46 -- 433
6735Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2009-S49 -- 2009 SF2
C00Velikie Luki Obs. in Russia, 1 in MPEC 2009-S46 -- 2009 KC3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 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 SK2JPL Sentry1620202111.1e-10-5.75-5.750JPL: "Analysis based on 12 observations spanning 1.0149 days (2009-Sep-18.46606 to 2009-Sep-19.48097)." Diameter approximately 0.710 km. from mean, weighted H=18.4.
2009 SH2JPL Sentry16202014-21094412.6e-05-4.58-5.570JPL: "Analysis based on 9 observations spanning .56493 days (2009-Sep-18.76541 to 2009-Sep-19.33034)." Diameter approximately 0.046 km. from mean, weighted H=24.4.
2009 SG2JPL Sentry16202022-2101131.3e-08-5.11-5.230JPL: "Analysis based on 19 observations spanning .53098 days (2009-Sep-18.72181 to 2009-Sep-19.25279)." Diameter approximately 0.340 km. from mean, weighted H=20.0.
2009 SX1JPL Sentry16202027-2109777.4e-08-4.10-5.220JPL #2 for the day: "Analysis based on 23 observations spanning .68950 days (2009-Sep-18.38999 to 2009-Sep-19.07949)." Diameter approximately 0.600 km. from mean, weighted H=18.7.
NEODyS16202012-206441.09e-09-5.25-5.360NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2009/09/18.391 to 2009/09/19.080."
2009 SW1NEODyS1621206421.83e-08-7.09-7.290NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2009/09/18.310 to 2009/09/18.956."
JPL Sentry0359206418.3e-09-7.53-7.530JPL: "Analysis based on 13 observations spanning .64588 days (2009-Sep-18.30955 to 2009-Sep-18.95543)." Diameter approximately 0.065 km. from mean, weighted H=23.6.
2009 SN1NEODyS16202045-206821.03e-09-9.11-9.220NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2009/09/18.340 to 2009/09/18.503."
2009 SM1NEODyS16202032-207563.75e-08-7.33-7.600NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2009/09/18.237 to 2009/09/18.497."
2009 SK1JPL Sentry1620R E M O V E DJPL: Risk listing removed at 0933 UTC.
2009 SH1NEODyS16202068-208825.83e-09-11.12-11.240NEODyS: "Based on 12 optical observations (of which 1 are rejected as outliers) from 2009/09/18.212 to 2009/09/18.391."
2009 SVJPL Sentry16202078-210647.5e-10-6.71-7.120JPL: "Analysis based on 17 observations spanning 1.0331 days (2009-Sep-17.19449 to 2009-Sep-18.22759)." Diameter approximately 0.372 km. from mean, weighted H=19.8.
2009 SKJPL Sentry1620R E M O V E DJPL: Risk listing removed at 0932 UTC.
NEODyS1620R E M O V E D-
2009 SDJPL Sentry1620R E M O V E DJPL: Risk listing removed at 0853 UTC.
NEODyS1620R E M O V E D-
2009 SBJPL Sentry16202012-2107821.9e-07-4.08-4.890JPL: "Analysis based on 21 observations spanning 2.1760 days (2009-Sep-16.24433 to 2009-Sep-18.42036)." Diameter approximately 0.233 km. from mean, weighted H=20.8.
NEODyS16202012-2090811.3e-07-4.16-4.850NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2009/09/16.245 to 2009/09/18.421."
2009 RZ3JPL Sentry16202025-2104221.0e-07-3.50-4.290JPL: "Analysis based on 33 observations spanning 4.9625 days (2009-Sep-14.20535 to 2009-Sep-19.1679)." Diameter approximately 0.615 km. from mean, weighted H=18.7.
NEODyS16202025-2090225.45e-08-3.66-4.260NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/09/14.206 to 2009/09/19.169."

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 19 September '09

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

1802Grabbed MPEC 2009-S54 - 2009 SL2 - see above
1620Noted 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 JPL Sentry has updated its 2009 SB risk assessment - see above
Noted that NEODyS has updated its 2009 SB risk assessment - see above
Noted that JPL Sentry has removed 2009 SD as an impact risk - see above
Noted that NEODyS has removed 2009 SD as an impact risk - see above
Noted that JPL Sentry has posted 2009 SG2 as an impact risk - see above
Noted that NEODyS has posted 2009 SH1 as an impact risk - see above
Noted that JPL Sentry has posted 2009 SH2 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SK as an impact risk - see above
Noted that NEODyS has removed 2009 SK as an impact risk - see above
Noted that JPL Sentry has removed 2009 SK1 as an impact risk - see above
Noted that JPL Sentry has posted 2009 SK2 as an impact risk - see above
Noted that NEODyS has posted 2009 SM1 as an impact risk - see above
Noted that NEODyS has posted 2009 SN1 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 SV risk assessment - see above
Noted that NEODyS has posted 2009 SW1 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 SX1 risk assessment - see above
Noted that NEODyS has posted 2009 SX1 as an impact risk - see above
Grabbed MPEC 2009-S46 - Daily Orbit Update - see above
Grabbed MPEC 2009-S47 - 2009 SC2 - see above
Grabbed MPEC 2009-S48 - 2009 SE2 - see above
Grabbed MPEC 2009-S49 - 2009 SF2 - see above
Grabbed MPEC 2009-S50 - 2009 SG2 - see above
Grabbed MPEC 2009-S51 - 2009 SH2 - see above
Grabbed MPEC 2009-S52 - 2009 SJ2 - see above
Grabbed MPEC 2009-S53 - 2009 SK2 - see above
0429Noted that JPL Sentry has posted 2009 SX1 as an impact risk - see above
0359Noted that JPL Sentry has posted 2009 SW1 as an impact risk - see above
0215Grabbed MPEC 2009-S45 - 2009 SX1 - see above
0146Grabbed MPEC 2009-S44 - 2009 SW1 - see above