Contents  on 1 October '11

Resources:

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NEOCP Activity  on 1 October '11

The MPC's NEO Confirmation Page has 21 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 21 objects listed. Of these, ten were "one nighters." The Tracking News counted a total of 35 listings on the NEOCP on this day.

New MPECs  on 1 October '11

Minor Planet Electronic Circulars

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


MPEC 2011-T05 - "21:29 UT" - 2011 TB


MPEC 2011-T04 - "12:14 UT" - 2011 SE191


MPEC 2011-T03 - "12:11 UT" - 2011 SD191


MPEC 2011-T02 - "12:10 UT" - 2011 SC191


<< DOU on 1 Oct. '11 >>  MPEC 2011-T01 - "06:04 UT" - Daily Orbit Update

Observers  on 1 October '11

A total of 30 observers appeared in this day's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-T02 -- 2011 SC191
C60Argelander Institute for Astronomy Obs. (AIfA Obs.) in Germany, 4 in MPEC 2011-T01 -- 32906, 209924, 144332, 5143
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2011-T01 -- 2011 SS67, 2011 SS25, 2011 SR69, 2011 SR25, 2011 SM68, 2011 SL102, 2011 SJ68, 2011 GA55
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-T01 -- 2011 SO32
160Castelmartini Obs. in Italy, 3 in MPEC 2011-T01 -- 2011 OV4, 2011 HC36, 276274
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2011-T01 & 2011-T05 -- 2011 TB, 2011 SJ16, 2008 VH, 137799
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPEC 2011-T01 -- 2011 SQ12, 2011 SP68, 2011 SP32, 2011 SM68, 2011 SJ68, 2011 SE97, 2011 SE108, 2011 QD48, 2011 OY17, 2011 MD11, 2011 JP29, 2011 HG, 2011 GC60
J18Churchstoke Obs. in Wales, 1 in MPEC 2011-T05 -- 2011 TB
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-T01 -- 39572
113Drebach Obs. in Germany, 1 in MPEC 2011-T03 -- 2011 SD191
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2011-T02, 2011-T03 & 2011-T04 -- 2011 SE191, 2011 SD191, 2011 SC191
J95Great Shefford Obs. in England, 7 in MPECs 2011-T01, 2011-T02, 2011-T03, 2011-T04 & 2011-T05 -- 2011 TB, 2011 SO5, 2011 SN189, 2011 SE97, 2011 SE191, 2011 SD191, 2011 SC191
A17Guidestar Obs. in Germany, 7 in MPECs 2011-T01, 2011-T03 & 2011-T05 -- 2011 TB, 2011 SM68, 2011 SJ16, 2011 SF25, 2011 SD191, 2011 KP17, 154302
B86Hagen Obs. in Germany, 1 in MPEC 2011-T02 -- 2011 SC191
046Klet Obs. in the Czech Republic, 1 in MPEC 2011-T01 -- 2011 SM68
704LINEAR in New Mexico, 1 in MPEC 2011-T03 -- 2011 SD191
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2011-T01, 2011-T04 & 2011-T05 -- 2011 TB, 2011 SE191, 2011 PE2
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-T01 -- 2011 SS25
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2011-T01, 2011-T02, 2011-T03 & 2011-T04 -- 2011 SE191, 2011 SD191, 2011 SC191, 2009 VO24, 253841, 152685
A24New Millennium Obs. in Italy, 13 in MPEC 2011-T01 -- 2010 XO56, 2008 VH, 2003 AL73, 68348, 280136, 274855, 162913, 8567, 3988, 3288, 3103, 1917, 1036
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-T01 -- 8176
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-T01 -- 39572
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2011-T01 & 2011-T04 -- 2011 SS25, 2011 SE191, 2011 RR12
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-T04 -- 2011 SE191
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2011-T01 -- 2011 SM173, 2009 HV2
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-T02 -- 2011 SC191
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2011-T01 & 2011-T05 -- 2011 TB, 2011 SV71, 2011 SP26, 2011 SM68, 2011 SD173
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-T04 -- 2011 SE191
A78Stia Obs. in Italy, 2 in MPEC 2011-T01 -- 2011 PT1, 2011 OV4
B01Taunus Obs. in Germany, 1 in MPEC 2011-T01 -- 221787
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 TBJPL Sentry2359208714.3e-09-7.82-7.820JPL: "Analysis based on 19 observations spanning .60624 days (2011-Oct-01.24938 to 2011-Oct-01.85562)." Diameter approximately 0.062 km. from mean, weighted H=23.7.
2011 SE191JPL Sentry1544209841.1e-07-7.17-7.500JPL: "Analysis based on 27 observations spanning .85694 days (2011-Sep-30.41481 to 2011-Oct-01.27175)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
2011 SO189NEODyS15442050-2090193.45e-05-5.25-5.620NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-09-29.424 to 2011-09-30.562."
2011 SM173JPL Sentry15442058-208976.8e-05-5.42-5.460JPL: "Analysis based on 27 observations spanning 1.2283 days (2011-Sep-29.22504 to 2011-Sep-30.453311)." Diameter approximately 0.009 km. from mean, weighted H=27.8.
NEODyS15442058-208974.24e-05-5.61-5.640NEODyS: "Based on 28 optical observations (of which 3 are rejected as outliers) from 2011-09-29.226 to 2011-09-30.454."
2011 SD173JPL Sentry15442024-2111737.8e-07-3.30-3.820JPL: "Analysis based on 24 observations spanning 6.0543 days (2011-Sep-24.42522 to 2011-Sep-30.4795)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
NEODyS15442024-2090517.54e-07-3.29-3.760NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2011-09-24.426 to 2011-09-30.480."
2011 SE97JPL Sentry1544209515.5e-08-7.17-7.170JPL: "Analysis based on 52 observations spanning 4.6612 days (2011-Sep-26.35341 to 2011-Oct-01.01463)." Diameter approximately 0.040 km. from mean, weighted H=24.7.
2011 SV71JPL Sentry15442019-2099263.7e-07-3.17-3.810JPL: "Analysis based on 22 observations spanning 5.9187 days (2011-Sep-24.4869 to 2011-Sep-30.40557)." Diameter approximately 0.736 km. from mean, weighted H=18.3.
NEODyS15442019-2086183.12e-07-3.25-3.860NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2011-09-24.488 to 2011-09-30.406."
2011 SM68NEODyS15442016-201614.18e-05-0.43-0.431NEODyS: "Based on 90 optical observations (of which 0 are rejected as outliers) from 2011-09-24.356 to 2011-10-01.007."
2011 PE2NEODyS1544R E M O V E D-
JPL Sentry1544R E M O V E DJPL: Risk listing removed at 0851 UTC.

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 1 October '11

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

2359Noted that JPL Sentry has posted 2011 TB as an impact risk - see above
2222Grabbed MPEC 2011-T05 - 2011 TB - see above
1544Noted that JPL Sentry has removed 2011 PE2 as an impact risk - see above
Noted that NEODyS has removed 2011 PE2 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 SD173 risk assessment - see above
Noted that NEODyS has updated its 2011 SD173 risk assessment - see above
Noted that JPL Sentry has posted 2011 SE191 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 SE97 risk assessment - see above
Noted that JPL Sentry has updated its 2011 SM173 risk assessment - see above
Noted that NEODyS has updated its 2011 SM173 risk assessment - see above
Noted that NEODyS has updated its 2011 SM68 risk assessment - see above
Noted that NEODyS has posted 2011 SO189 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 SV71 risk assessment - see above
Noted that NEODyS has updated its 2011 SV71 risk assessment - see above
Grabbed MPEC 2011-T01 - Daily Orbit Update - see above
Grabbed MPEC 2011-T02 - 2011 SC191 - see above
Grabbed MPEC 2011-T03 - 2011 SD191 - see above
Grabbed MPEC 2011-T04 - 2011 SE191 - see above