Contents  on 2 October '11

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NEOCP Activity  on 2 October '11

The MPC's NEO Confirmation Page has 4 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four objects listed. Of these, one was a "one nighter." The Tracking News counted a total of 24 listings on the NEOCP on this day.

New MPECs  on 2 October '11

Minor Planet Electronic Circulars

There were ten MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-T15 - "23:59 UT" - 2011 TO


MPEC 2011-T14 - "23:49 UT" - 2001 GR2


MPEC 2011-T13 - "22:58 UT" - 2001 FA58


MPEC 2011-T12 - "19:27 UT" - Comet C/2011 S2


MPEC 2011-T11 - "15:07 UT" - 2011 TK


MPEC 2011-T10 - "15:05 UT" - 2011 TJ


MPEC 2011-T09 - "15:03 UT" - 2011 TH


MPEC 2011-T08 - "15:01 UT" - 2011 SU232


MPEC 2011-T07 - "15:00 UT" - 2011 ST232


<< DOU on 2 Oct. '11 >>  MPEC 2011-T06 - "06:05 UT" - Daily Orbit Update

Observers  on 2 October '11

A total of 39 observers appeared in this day's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 2 in MPECs 2011-T10 & 2011-T11 -- 2011 TK, 2011 TJ
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2011-T12 -- C/2011 S2
C60Argelander Institute for Astronomy Obs. in Germany, 1 in MPEC 2011-T06 -- 88710
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2011-T06, 2011-T07, 2011-T08, 2011-T11, 2011-T12 & 2011-T13 -- 2011 TK, 2011 SU68, 2011 SU232, 2011 ST232, 2011 SS25, 2011 SO189, 2011 SL102, 2011 SG5, 2011 SF173, 2011 SD173, 2011 SB25, C/2011 S2, 2011 RR12, 2011 HP, 2011 EF17, 2001 FA58
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-T06 -- 2002 KH3
C77Bernezzo Obs., 1 in MPEC 2011-T06 -- 1917
160Castelmartini Obs. in Italy, 2 in MPEC 2011-T06 -- 2011 OQ5, 2004 SV55
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2011-T06, 2011-T10, 2011-T12 & 2011-T13 -- 2011 TJ, 2011 SP68, C/2011 S2, 2004 QB17, 2001 FA58, 54071, 24475, 162980, 7092
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2011-T06 & 2011-T13 -- 2011 QF23, 2011 QD48, 2011 GD62, 2001 FA58
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-T12 -- C/2011 S2
113Drebach Obs. in Germany, 1 in MPEC 2011-T12 -- C/2011 S2
595Farra d'Isonzo Obs. in Italy, 4 in MPECs 2011-T10, 2011-T11, 2011-T12 & 2011-T13 -- 2011 TK, 2011 TJ, C/2011 S2, 2001 FA58
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-T07 -- 2011 ST232
157Frasso Sabino Obs. in Italy, 4 in MPECs 2011-T06 & 2011-T12 -- 2011 SG16, 2011 SF25, C/2011 S2, 2011 QZ13
C73Galati Obs., 2 in MPEC 2011-T06 -- 85804, 16816
J95Great Shefford Obs. in England, 4 in MPECs 2011-T08, 2011-T12, 2011-T14 & 2011-T15 -- 2011 TO, 2011 SU232, C/2011 S2, 2001 GR2
A17Guidestar Obs. in Germany, 3 in MPECs 2011-T06, 2011-T12 & 2011-T15 -- 2011 TO, 2011 SL102, C/2011 S2
B86Hagen Obs. in Germany, 1 in MPEC 2011-T12 -- C/2011 S2
046Klet Obs. in the Czech Republic, 12 in MPEC 2011-T06 -- 2011 SS25, 2011 SR69, 2011 SQ12, 2011 SO32, 2011 SM68, 2011 SJ16, 2011 RR12, 2011 QE38, 2011 PT1, 2011 OV4, 2011 OQ5, 2006 SQ78
704LINEAR in New Mexico, 12 in MPECs 2011-T06, 2011-T12, 2011-T14 & 2011-T15 -- 2011 TO, 2011 SS25, C/2011 S2, 2011 QE38, 2005 CJ, 2001 GR2, 288914, 24475, 190491, 162980, 138155, 7092
H01Magdalena Ridge Obs. (MRO) in New Mexico, 9 in MPECs 2011-T06, 2011-T07, 2011-T08, 2011-T09, 2011-T10, 2011-T11, 2011-T12 & 2011-T13 -- 2011 TK, 2011 TJ, 2011 TH, 2011 SY120, 2011 SU232, 2011 ST232, C/2011 S2, 2001 FA58, 101955
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2011-T06, 2011-T07, 2011-T09, 2011-T11 & 2011-T12 -- 2011 TK, 2011 TH, 2011 ST232, 2011 SS25, 2011 SD25, C/2011 S2, 2010 VC1, 2001 SO263, 1991 TF3, 5131
A13Naef Obs. in Switzerland, 2 in MPEC 2011-T06 -- 2011 LJ19, 7341
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-T06 -- 2009 QF31
A53Peschiera del Garda Obs. in Italy, 4 in MPEC 2011-T06 -- 2011 QE38, 2011 PT1, 2011 LJ19, 2000 SP43
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-T12 -- C/2011 S2
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-T12 -- C/2011 S2
461SZTE Asteroid Program in Hungary, 2 in MPECs 2011-T08 & 2011-T12 -- 2011 SU232, C/2011 S2
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2011-T08, 2011-T09, 2011-T10, 2011-T11 & 2011-T13 -- 2011 TK, 2011 TJ, 2011 TH, 2011 SU232, 2001 FA58
H36Sandlot Obs. in Kansas, 6 in MPECs 2011-T08, 2011-T09, 2011-T10, 2011-T11, 2011-T12 & 2011-T13 -- 2011 TK, 2011 TJ, 2011 TH, 2011 SU232, C/2011 S2, 2001 FA58
204Schiaparelli Obs. in Italy, 6 in MPECs 2011-T06, 2011-T09, 2011-T10, 2011-T11, 2011-T12 & 2011-T13 -- 2011 TK, 2011 TJ, 2011 TH, 2011 TB, C/2011 S2, 2001 FA58
510Siegen Obs. in Germany, 1 in MPEC 2011-T12 -- C/2011 S2
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2011-T06 -- 2011 SF108, 2011 QY11, 90075
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2011-T06 & 2011-T09 -- 2011 TH, 2011 SU67, 2011 SS26, 2011 SR12, 2011 SH189, 2011 SG16
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2011-T10 & 2011-T11 -- 2011 TK, 2011 TJ
A97Stammersdorf Obs. in Austria, 2 in MPEC 2011-T06 -- 1036, 433
A78Stia Obs. in Italy, 2 in MPEC 2011-T06 -- 2011 OQ5, 2000 SH8
A71Stixendorf Obs. in Austria, 1 in MPEC 2011-T12 -- C/2011 S2
A98Taurus-1 Obs. in Belarus, 2 in MPEC 2011-T06 -- 2004 SV55, 2000 SP43
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-T12 -- C/2011 S2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 2 October '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON 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
2011 TKJPL Sentry17222021-2111739.9e-08-4.98-6.070JPL: "Analysis based on 30 observations spanning 1.0171 days (2011-Oct-01.34764 to 2011-Oct-02.364737)." Diameter approximately 0.210 km. from mean, weighted H=21.0.
2011 TBJPL Sentry1608208718.7e-10-8.50-8.500JPL: "Analysis based on 22 observations spanning .62691 days (2011-Oct-01.24938 to 2011-Oct-01.87629)." Diameter approximately 0.062 km. from mean, weighted H=23.7.
2011 ST232JPL Sentry17222080-211122.1e-09-7.34-7.370JPL: "Analysis based on 16 observations spanning 2.7958 days (2011-Sep-29.46471 to 2011-Oct-02.26054)." Diameter approximately 0.180 km. from mean, weighted H=21.4.
2011 SO189NEODyS16092053-2090187.2e-05-4.99-5.350NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-09-29.424 to 2011-10-01.248."
JPL Sentry16082050-2102167.0e-05-5.00-5.340JPL: "Analysis based on 14 observations spanning 1.8234 days (2011-Sep-29.42352 to 2011-Oct-01.246908)." Diameter approximately 0.016 km. from mean, weighted H=26.7.
2011 SD173NEODyS16092024-2090468.25e-07-3.27-3.70NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2011-09-24.426 to 2011-10-01.360."
JPL Sentry16082026-2094457.4e-07-3.32-3.840JPL: "Analysis based on 27 observations spanning 6.9342 days (2011-Sep-24.42522 to 2011-Oct-01.359468)." Diameter approximately 0.420 km. from mean, weighted H=19.6.
2011 SY120JPL Sentry1608R E M O V E DJPL: Risk listing removed at 0951 UTC.
2011 SM68NEODyS16092016-202023.47e-06-1.51-1.510NEODyS: "Based on 96 optical observations (of which 0 are rejected as outliers) from 2011-09-24.356 to 2011-10-01.968."

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 2 October '11

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

0028 10/3Grabbed MPEC 2011-T15 - 2011 TO - see above
2359Grabbed MPEC 2011-T14 - 2001 GR2 - see above
2307Grabbed MPEC 2011-T13 - 2001 FA58 - see above
2218Grabbed MPEC 2011-T12 - Comet C/2011 S2 - see above
1722Noted that JPL Sentry has posted 2011 ST232 as an impact risk - see above
Noted that JPL Sentry has posted 2011 TK as an impact risk - see above
1609Noted that NEODyS has updated its 2011 SD173 risk assessment - see above
Noted that NEODyS has updated its 2011 SM68 risk assessment - see above
Noted that NEODyS has updated its 2011 SO189 risk assessment - see above
1608Noted that JPL Sentry has updated its 2011 SD173 risk assessment - see above
Noted that JPL Sentry has updated its 2011 SO189 risk assessment - see above
Noted that JPL Sentry has removed 2011 SY120 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 TB risk assessment - see above
Grabbed MPEC 2011-T06 - Daily Orbit Update - see above
Grabbed MPEC 2011-T07 - 2011 ST232 - see above
Grabbed MPEC 2011-T08 - 2011 SU232 - see above
Grabbed MPEC 2011-T09 - 2011 TH - see above
Grabbed MPEC 2011-T10 - 2011 TJ - see above
Grabbed MPEC 2011-T11 - 2011 TK - see above