Contents  on 29 September '11

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NEOCP Activity  on 29 September '11

The MPC's NEO Confirmation Page has 37 listings

When last checked at 2331 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 37 objects listed. Of these, 26 were "one nighters."

New MPECs  on 29 September '11

Minor Planet Electronic Circulars

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


MPEC 2011-S97 - "22:55 UT" - 2011 SM173


MPEC 2011-S96 - "18:44 UT" - 2011 SL173


MPEC 2011-S95 - "18:43 UT" - 2011 SG173


MPEC 2011-S94 - "18:41 UT" - 2011 SF173


MPEC 2011-S93 - "18:39 UT" - 2011 SD173


<< DOU on 29 Sept. '11 >>  MPEC 2011-S92 - "06:04 UT" - Daily Orbit Update


MPEC 2011-S91 - "02:47 UT" - 2007 OV

Observers  on 29 September '11

A total of 29 observers appeared in this day's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-S92 -- 2011 SR25
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2011-S91, 2011-S94 & 2011-S95 -- 2011 SG173, 2011 SF173, 2007 OV
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-S92 -- 2004 RJ84
160Castelmartini Obs. in Italy, 1 in MPEC 2011-S92 -- 2011 HC36
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2011-S92 & 2011-S97 -- 2011 SM173, 90075
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2011-S92 -- 2011 SZ15, 2011 SS25, 2011 SO32, 2011 SM68, 2011 SK16, 2011 SJ16, 2011 SG16, 2011 SE97, 2011 RR12
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2011-S92 -- 2011 OV4
821Cordoba-Bosque Alegre Obs., 1 in MPEC 2011-S92 -- 2011 SO26
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-S95 -- 2011 SG173
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-S91 -- 2007 OV
J95Great Shefford Obs. in England, 3 in MPECs 2011-S92 & 2011-S97 -- 2011 SY120, 2011 SM173, 2011 SA121
A17Guidestar Obs. in Germany, 7 in MPEC 2011-S92 -- 2011 SS25, 2011 SR69, 2011 SR25, 2011 SO32, 2011 SJ16, 2011 RR12, 2011 RF
240Herrenberg Obs. in Germany, 3 in MPEC 2011-S92 -- 2011 RF, 283460, 20086
046Klet Obs. in the Czech Republic, 2 in MPEC 2011-S92 -- 2011 SM68, 2011 SJ16
704LINEAR in New Mexico, 5 in MPEC 2011-S92 -- 2011 RJ1, 1998 SC15, 90075, 190491, 16816
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-S94 & 2011-S96 -- 2011 SL173, 2011 SF173
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2011-S92, 2011-S93, 2011-S96 & 2011-S97 -- 2011 SM173, 2011 SL173, 2011 SD173, 85182, 35396, 293726, 6489
A24New Millennium Obs. in Italy, 8 in MPEC 2011-S92 -- 2010 XO56, 2008 VH, 2003 AL73, 280136, 274855, 162913, 3988, 3288
089Nikolaev Obs. in the Ukraine, 2 in MPEC 2011-S92 -- 3103, 1036
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2011-S94 & 2011-S95 -- 2011 SG173, 2011 SF173
B49Paus Obs. in Spain, 1 in MPEC 2011-S92 -- 2011 SF25
A53Peschiera del Garda Obs. in Italy, 3 in MPEC 2011-S92 -- 2011 SQ12, 2011 OQ5, 2011 LJ19
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-S92 -- 2011 SR25
H36Sandlot Obs. in Kansas, 3 in MPEC 2011-S92 -- 2011 SU68, 2011 SO32, 2011 SM68
204Schiaparelli Obs. in Italy, 12 in MPEC 2011-S92 -- 2011 SS25, 2011 SQ12, 2011 SP68, 2011 SO5, 2011 SM68, 2011 SF108, 2011 SE58, 2011 RR12, 2011 RJ1, 2000 SP43, 1998 SC15, 1991 TF3
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-S92 -- 2011 SJ16
291Spacewatch 1.8m telescope in Arizona, 8 in MPECs 2011-S92, 2011-S93 & 2011-S94 -- 2011 SV71, 2011 SU68, 2011 SF173, 2011 SE97, 2011 SE108, 2011 SD173, 2011 SA16, 2011 QC46
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-S97 -- 2011 SM173
B01Taunus Obs. in Germany, 1 in MPEC 2011-S92 -- 2011 SR25
C38Varuna Obs. in Italy, 1 in MPEC 2011-S92 -- 283460
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 September '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2331 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 SD173JPL Sentry23312022-21111151.7e-06-2.96-3.740JPL: "Analysis based on 21 observations spanning 4.9406 days (2011-Sep-24.42522 to 2011-Sep-29.36584)." Diameter approximately 0.421 km. from mean, weighted H=19.5.
2011 SY120JPL Sentry23312017-210593.8e-09-6.93-7.000JPL: "Analysis based on 18 observations spanning 1.9708 days (2011-Sep-26.34936 to 2011-Sep-28.32019)." Diameter approximately 0.071 km. from mean, weighted H=23.4.
2011 SV71NEODyS23322015-2090901.67e-07-3.19-4.090NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-09-24.488 to 2011-09-28.438."
JPL Sentry23312017-2111782.0e-07-3.28-4.160JPL: "Analysis based on 16 observations spanning 3.9501 days (2011-Sep-24.4869 to 2011-Sep-28.43696)." Diameter approximately 0.753 km. from mean, weighted H=18.3.
2011 SM68NEODyS23322016-201615.22e-05-0.35-0.351NEODyS: "Based on 53 optical observations (of which 0 are rejected as outliers) from 2011-09-24.356 to 2011-09-28.312."
JPL Sentry23312016-201923.3e-05-0.59-0.681JPL: "Analysis based on 39 observations spanning 2.6750 days (2011-Sep-24.35532 to 2011-Sep-27.0303)." Diameter approximately 0.417 km. from mean, weighted H=19.5.
2011 SE58JPL Sentry23312052-205525.8e-08-8.32-8.430JPL: "Analysis based on 55 observations spanning 5.6396 days (2011-Sep-21.36854 to 2011-Sep-27.008189)." Diameter approximately 0.010 km. from mean, weighted H=27.6.
NEODyS2331R E M O V E D-
2011 SP26JPL Sentry23312024-2110233.9e-07-5.75-5.780JPL: "Analysis based on 12 observations spanning 2.9236 days (2011-Sep-20.52061 to 2011-Sep-23.4442)." Diameter approximately 0.059 km. from mean, weighted H=23.8.
2011 SR5NEODyS23322030-203014.51e-10-6.61-6.610NEODyS: "Based on 188 optical observations (of which 4 are rejected as outliers) from 2011-09-19.368 to 2011-09-26.007."
JPL Sentry2331203013.7e-09-5.70-5.700JPL: "Analysis based on 187 observations spanning 6.6393 days (2011-Sep-19.36681 to 2011-Sep-26.00611)." Diameter approximately 0.210 km. from mean, weighted H=21.0.
2011 SG5JPL Sentry2331R E M O V E DJPL: Risk listing removed at 1653 UTC 27 Sept..
2011 PE2JPL Sentry23312027-209021.7e-06-4.39-4.390JPL: "Analysis based on 91 observations spanning 46.295 days (2011-Aug-08.06387 to 2011-Sep-23.35856)." Diameter approximately 0.083 km. from mean, weighted H=23.1.

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 29 September '11

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

2332Grabbed MPEC 2011-S92 - Daily Orbit Update - see above
Grabbed MPEC 2011-S97 - 2011 SM173 - see above
2331Noted that JPL Sentry has updated its 2011 PE2 risk assessment - see above
Noted that JPL Sentry has posted 2011 SD173 as an impact risk - see above
Noted that JPL Sentry has posted 2011 SE58 as an impact risk - see above
Noted that NEODyS has removed 2011 SE58 as an impact risk - see above
Noted that JPL Sentry has removed 2011 SG5 as an impact risk - see above
Noted that JPL Sentry has posted 2011 SM68 as an impact risk - see above
Noted that NEODyS has posted 2011 SM68 as an impact risk - see above
Noted that JPL Sentry has posted 2011 SP26 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 SR5 risk assessment - see above
Noted that NEODyS has reposted 2011 SR5 as an impact risk - see above
Noted that JPL Sentry has posted 2011 SV71 as an impact risk - see above
Noted that NEODyS has posted 2011 SV71 as an impact risk - see above
Noted that JPL Sentry has posted 2011 SY120 as an impact risk - see above
Grabbed MPEC 2011-S91 - 2007 OV - see above
Grabbed MPEC 2011-S93 - 2011 SD173 - see above
Grabbed MPEC 2011-S94 - 2011 SF173 - see above
Grabbed MPEC 2011-S95 - 2011 SG173 - see above
Grabbed MPEC 2011-S96 - 2011 SL173 - see above