The A/CC news pages will probably 
not update again until Oct. 8th UTC.

These A/CC news pages will probably not update again until sometime Saturday, October 8th UTC. This is part of only the second planned down time since we began publishing daily news of Solar System small objects more than nine and half years ago. NEOCP counts and probably some interim impact risk ratings will be lost, neither of which are of lasting importance, but all MPECs, observer credits, and changed risk ratings will be posted when our reporting resumes.


Contents  on 3 October '11

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 3 October '11

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2009 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 22 listings on the NEOCP 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 3 October '11

Minor Planet Electronic Circulars

As of last check at 2009 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-T20 - "16:22 UT" - 2011 EM51


MPEC 2011-T19 - "16:20 UT" - 2006 VY13


<< DOU on 3 Oct. '11 >>  MPEC 2011-T18 - "06:05 UT" - Daily Orbit Update


MPEC 2011-T17 - "01:24 UT" - 2010 LJ14


MPEC 2011-T16 - "00:00 UT" - 2011 TP

Observers  on 3 October '11

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 25 in MPECs 2011-T17, 2011-T18, 2011-T19 & 2011-T20 -- 2011 SY120, 2011 SV71, 2011 SS25, 2011 SR69, 2011 SR25, 2011 SQ32, 2011 SQ25, 2011 SQ12, 2011 SO32, 2011 SO189, 2011 SM68, 2011 SL102, 2011 SJ68, 2011 SG173, 2011 SF25, 2011 SE97, 2011 SD173, 2011 RV14, 2011 QE48, 2011 PX, 2011 GM62, 2011 EM51, 2011 CG2, 2010 LJ14, 2006 VY13
235CAST Obs. in Italy, 2 in MPEC 2011-T18 -- 2011 SS25, 2011 SQ12
160Castelmartini Obs. in Italy, 8 in MPEC 2011-T18 -- 2011 SQ12, 2011 PT1, 2011 OV4, 2011 OQ5, 2011 HC36, 2004 SV55, 2000 SP43, 276274
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2011-T18 -- 2011 TJ, 2011 SP70
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-T18 -- 5653
113Drebach Obs. in Germany, 2 in MPEC 2011-T18 -- 285625, 276274
J27El Guijo Obs. in Spain, 1 in MPEC 2011-T18 -- 219071
C74El Teatrillo de Lyra Obs., 1 in MPEC 2011-T18 -- 1036
157Frasso Sabino Obs. in Italy, 2 in MPEC 2011-T18 -- 2011 SR69, 2011 SJ16
476Grange Obs., 1 in MPEC 2011-T18 -- 138524
J95Great Shefford Obs. in England, 1 in MPEC 2011-T16 -- 2011 TP
A17Guidestar Obs. in Germany, 2 in MPEC 2011-T18 -- 2011 SO32, 154302
046Klet Obs. in the Czech Republic, 12 in MPEC 2011-T18 -- 2011 SS25, 2011 SR69, 2011 SR25, 2011 SQ12, 2011 SO32, 2011 SJ16, 2011 RR12, 2011 QE38, 2011 PT1, 2011 OV4, 2011 OQ5, 2011 MO4
704LINEAR in New Mexico, 14 in MPECs 2011-T16 & 2011-T18 -- 2011 TP, 2011 TJ, 2011 QE48, 2011 QE38, 2011 MV1, 2001 UE5, 87311, 42286, 274855, 190491, 190166, 143678, 136923, 1627
130Lumezzane Obs. in Italy, 2 in MPEC 2011-T18 -- 2006 SQ78, 4503
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2011-T18 -- 2011 OV4, 2006 SQ78
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPEC 2011-T18 -- 2011 SV71, 2011 SO189, 2011 SE191, 2011 SD173
A13Naef Obs. in Switzerland, 1 in MPEC 2011-T18 -- 2011 SO32
A24New Millennium Obs. in Italy, 15 in MPEC 2011-T18 -- 2011 KP17, 2011 KN9, 2011 JP29, 2011 EZ78, 2010 NJ1, 2009 WW104, 2004 LH, 2004 JO2, 37336, 267759, 20086, 163250, 137170, 7482, 2102
C47Nonndorf Obs., 8 in MPEC 2011-T18 -- 2011 SO32, 2011 SJ16, 2011 QE38, 2011 PT1, 2011 OQ5, 2011 LJ19, 2000 SP43, 2000 SH8
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-T18 -- 2011 BE38
104San Marcello Pistoiese Obs. in Italy, 2 in MPEC 2011-T18 -- 2011 SQ12, 2008 DH23
233San Vito Obs. in Italy, 2 in MPEC 2011-T18 -- 2000 SH8, 1917
J84South Obs. in England, 1 in MPEC 2011-T18 -- 2000 SP43
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-T16 -- 2011 TP
A78Stia Obs. in Italy, 4 in MPEC 2011-T18 -- 2011 SQ12, 2011 PT1, 2011 OV4, 137084
198Wildberg Obs. in Germany, 1 in MPEC 2011-T18 -- 5653
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 October '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2009 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 TOJPL Sentry03032049-2092329.3e-05-4.57-4.680JPL: "Analysis based on 20 observations spanning 1.7296 days (2011-Oct-01.23672 to 2011-Oct-02.96632)." Diameter approximately 0.021 km. from mean, weighted H=26.0.
2011 TKNEODyS15222033-2088366.49e-08-5.13-5.950NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2011-10-01.348 to 2011-10-02.366."
2011 SE191JPL Sentry1522209818.9e-08-7.26-7.260JPL: "Analysis based on 31 observations spanning 2.0498 days (2011-Sep-30.41481 to 2011-Oct-02.46461)." Diameter approximately 0.032 km. from mean, weighted H=25.1.
2011 SO189JPL Sentry15222056-2090139.0e-05-4.80-5.140JPL: "Analysis based on 22 observations spanning 3.0433 days (2011-Sep-29.42352 to 2011-Oct-02.46682)." Diameter approximately 0.017 km. from mean, weighted H=26.5.
NEODyS15222056-2090189.67e-05-4.77-5.140NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2011-09-29.424 to 2011-10-02.468."
2011 SD173JPL Sentry15222026-2111722.2e-06-2.96-3.670JPL: "Analysis based on 34 observations spanning 7.9598 days (2011-Sep-24.42522 to 2011-Oct-02.38504)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
NEODyS15222026-2090433.67e-06-2.83-3.250NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2011-09-24.426 to 2011-10-02.386."
2011 SE97JPL Sentry1522209515.5e-08-7.18-7.180JPL: "Analysis based on 56 observations spanning 5.7952 days (2011-Sep-26.35341 to 2011-Oct-02.148635)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
2011 SV71JPL Sentry15222043-210799.4e-08-3.78-3.970JPL: "Analysis based on 29 observations spanning 7.9026 days (2011-Sep-24.4869 to 2011-Oct-02.38952)." Diameter approximately 0.760 km. from mean, weighted H=18.3.
NEODyS15222059-208668.81e-08-3.86-4.10NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2011-09-24.488 to 2011-10-02.390."
2011 SM68JPL Sentry1522201614.2e-06-1.43-1.430JPL: "Analysis based on 100 observations spanning 7.8968 days (2011-Sep-24.35532 to 2011-Oct-02.252159)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
NEODyS15222016-201611.6e-06-1.85-1.850NEODyS: "Based on 100 optical observations (of which 0 are rejected as outliers) from 2011-09-24.356 to 2011-10-02.253."

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 3 October '11

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

1634Grabbed MPEC 2011-T19 - 2006 VY13 - see above
Grabbed MPEC 2011-T20 - 2011 EM51 - see above
1522Noted 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 updated its 2011 SE191 risk assessment - see above
Noted that JPL Sentry has updated its 2011 SE97 risk assessment - see above
Noted that JPL Sentry has updated its 2011 SM68 risk assessment - see above
Noted that NEODyS has updated its 2011 SM68 risk assessment - see above
Noted that JPL Sentry has updated its 2011 SO189 risk assessment - see above
Noted that NEODyS has updated its 2011 SO189 risk assessment - 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
Noted that NEODyS has posted 2011 TK as an impact risk - see above
Grabbed MPEC 2011-T18 - Daily Orbit Update - see above
0303Noted that JPL Sentry has posted 2011 TO as an impact risk - see above
0300Grabbed MPEC 2011-T17 - 2010 LJ14 - see above
0028Grabbed MPEC 2011-T16 - 2011 TP - see above