Contents  on 25 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 25 September '09

The MPC's NEO Confirmation Page has 14 listings: 7 new, 7 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven new and seven updated listings. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 26 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 25 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-S97 - "23:02 UT" - 2003 QA112


MPEC 2009-S96 - "19:17 UT" - Comet P/2009 S1 (Gibbs)


MPEC 2009-S95 - "14:17 UT" - 2009 SC100


MPEC 2009-S94 - "14:08 UT" - 2009 SB100


MPEC 2009-S93 - "13:22 UT" - 2009 SA100


MPEC 2009-S92 - "13:15 UT" - 2009 SZ99


<< DOU on 25 Sept. '09 >>  MPEC 2009-S91 - "06:09 UT" - Daily Orbit Update

Observers  on 25 September '09

A total of 27 observing facilities appear in today's MPECs.

CodeObserver / observatory
160Castelmartini Obs. in Italy, 1 in MPEC 2009-S91 -- 2009 SW19
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2009-S91, 2009-S92 & 2009-S94 -- 2009 SZ99, 2009 SB100, 2009 QD34, 2009 HV77, 162980
I21El Condor Obs. in Argentina, 2 in MPECs 2009-S91 & 2009-S93 -- 2009 SG, 2009 SA100
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2009-S91 -- 3361
J95Great Shefford Obs. in England, 9 in MPEC 2009-S91 -- 2009 SW19, 2009 ST19, 2009 SO98, 2009 SM98, 2009 SK15, 2009 SJ18, 2009 SH2, 2009 SH15, 2009 SG18
A17Guidestar Obs. in Germany, 1 in MPEC 2009-S91 -- 159402
G92Jarnac Obs. in Arizona, 1 in MPEC 2009-S91 -- 2002 RQ25
585Kiev Comet Station in the Ukraine, 1 in MPEC 2009-S96 -- P/2009 S1
304Las Campanas Obs. in Chile, 1 in MPEC 2009-S97 -- 2003 QA112
688Lowell Obs. Anderson Mesa Station in Arizona, 1 in MPEC 2009-S97 -- 2003 QA112
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2009-S91, 2009-S93, 2009-S94 & 2009-S95 -- 2009 SH2, 2009 SC100, 2009 SB100, 2009 SA100
152Moletai Obs. in Lithuania, 1 in MPEC 2009-S91 -- 2009 NA
213Montcabre Obs. in Spain, 1 in MPEC 2009-S91 -- 2009 ST19
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2009-S91, 2009-S92 & 2009-S95 -- 2009 SZ99, 2009 SK2, 2009 SC100, 2009 LX, 2004 VA, 2004 TN, 141018
A13Naef Obs. in Switzerland, 1 in MPEC 2009-S91 -- 2009 HB82
B49Paus Obs. in Spain, 1 in MPEC 2009-S91 -- 2009 ST19
854Sabino Canyon Obs. in Arizona, 3 in MPECs 2009-S93, 2009-S94 & 2009-S95 -- 2009 SC100, 2009 SB100, 2009 SA100
H36Sandlot Obs. in Kansas, 3 in MPECs 2009-S91 & 2009-S94 -- 2009 SF2, 2009 SB100, 2009 OP9
204Schiaparelli Obs. in Italy, 5 in MPEC 2009-S91 -- 2009 SW17, 2009 SN, 2009 SK15, 2009 SJ15, 2005 EF
D21Shenton Park Obs. in Western Australia, 13 in MPEC 2009-S91 -- 2009 SW19, 2009 SP, 2009 SM, 2009 SJ15, 2009 SH2, 2009 SG2, 2009 RH, 2009 RD4, 2009 RB4, 2009 RA4, 2009 QD34, 2009 OP9, 2009 FU4
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPECs 2009-S91 & 2009-S93 -- 2009 SW17, 2009 SL2, 2009 SH2, 2009 SG2, 2009 SA100, 2005 SG19
510Siegen Obs. in Germany, 1 in MPEC 2009-S91 -- 433
691Spacewatch 0.9m telescope in Arizona, 5 in MPEC 2009-S91 -- 2009 RZ3, 2009 RV1, 2005 YX128, 55408, 144922
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2009-S91 & 2009-S92 -- 2009 SZ99, 2009 SW1, 2009 SV17, 2009 SG18, 2009 SC2, 2009 SC15, 2009 RU1, 2009 QF34, 2009 PH, 2005 UM5, 2003 SY17, 162998
I19Tanti Obs. in Argentina, 3 in MPECs 2009-S91 & 2009-S93 -- 2009 SA100, 2009 FU4, 3552
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2009-S96 -- P/2009 S1
C00Velikie Luki Obs. in Russia, 2 in MPEC 2009-S91 -- 2009 KC3, 17274
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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 SZ99JPL Sentry15062056-210159.3e-09-4.52-4.870JPL: "Analysis based on 19 observations spanning 3.0023 days (2009-Sep-22.10556 to 2009-Sep-25.10786)." Diameter approximately 0.710 km. from mean, weighted H=18.4.
2009 SO98JPL Sentry1320R E M O V E DJPL: Risk listing removed at 0931 UTC.
2009 SM98NEODyS13212048-205632.59e-06-4.08-4.330NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2009/09/24.245 to 2009/09/24.968."
JPL Sentry13202055-2108103.2e-06-4.02-4.320JPL: "Analysis based on 23 observations spanning .72297 days (2009-Sep-24.24446 to 2009-Sep-24.96743)." Diameter approximately 0.120 km. from mean, weighted H=22.3.
2009 SW19NEODyS13212026-2086304.57e-08-4.03-4.560NEODyS: "Based on 28 optical observations (of which 2 are rejected as outliers) from 2009/09/23.185 to 2009/09/25.123."
JPL Sentry13202026-2105322.9e-08-4.29-4.820JPL: "Analysis based on 27 observations spanning 1.9384 days (2009-Sep-23.18426 to 2009-Sep-25.12264)." Diameter approximately 0.389 km. from mean, weighted H=19.7.
2009 SG18NEODyS13212019-2090423.22e-07-2.12-2.470NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/09/21.172 to 2009/09/24.867."
JPL Sentry13202019-2095343.8e-07-2.06-2.400JPL: "Analysis based on 25 observations spanning 3.6952 days (2009-Sep-21.17145 to 2009-Sep-24.86668)." Diameter approximately 0.904 km. from mean, weighted H=17.9.
2009 SH2JPL Sentry13202095-210161.9e-05-5.00-5.150JPL: "Analysis based on 35 observations spanning 6.3654 days (2009-Sep-18.76541 to 2009-Sep-25.13082)." Diameter approximately 0.040 km. from mean, weighted H=24.6.

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 25 September '09

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

2358Grabbed MPEC 2009-S97 - 2003 QA112 - see above
2132Grabbed MPEC 2009-S96 - Comet P/2009 S1 (Gibbs) - see above
1506Noted that JPL Sentry has posted 2009 SZ99 as an impact risk - see above
1438Grabbed MPEC 2009-S94 - 2009 SB100 - see above
Grabbed MPEC 2009-S95 - 2009 SC100 - see above
1409Grabbed MPEC 2009-S93 - 2009 SA100 - see above
1321Noted that NEODyS has updated its 2009 SG18 risk assessment - see above
Noted that NEODyS has updated its 2009 SW19 risk assessment - see above
Grabbed MPEC 2009-S91 - Daily Orbit Update - see above
Grabbed MPEC 2009-S92 - 2009 SZ99 - see above
1320Noted that JPL Sentry has updated its 2009 SG18 risk assessment - see above
Noted that JPL Sentry has updated its 2009 SH2 risk assessment - see above
Noted that JPL Sentry has updated its 2009 SM98 risk assessment - see above
Noted that NEODyS has posted 2009 SM98 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SO98 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 SW19 risk assessment - see above