Contents  on 30 October '11


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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.

Radar Astrometry  on 30 October '11

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:

Data update noted at 0312 UTC when the database was dated 29 Oct.

NEOCP Activity  on 30 October '11

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, nineteen were "one nighters." The Tracking News counted a total of 36 listings on the NEOCP on this day.

New MPECs  on 30 October '11

Minor Planet Electronic Circulars

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

MPEC 2011-U108 - "22:16 UT" - Comet P/2011 UA134 (Spacewatch-Panstarrs)

MPEC 2011-U107 - "21:48 UT" - Comet C/2011 U3 (Panstarrs)

MPEC 2011-U106 - "16:21 UT" - 2011 UA193

MPEC 2011-U105 - "16:18 UT" - 2011 UY192

MPEC 2011-U104 - "16:16 UT" - 2011 UX192

MPEC 2011-U103 - "16:14 UT" - 2011 UV192

MPEC 2011-U102 - "15:49 UT" - 2004 BX1

<< DOU on 30 Oct. '11 >>  MPEC 2011-U101 - "06:05 UT" - Daily Orbit Update

Observers  on 30 October '11

A total of 24 observers appeared in this day's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2011 LC19
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2011-U101, 2011-U103, 2011-U104, 2011-U106, 2011-U107 & 2011-U108 -- 2011 UZ114, 2011 UX192, 2011 UV192, 2011 UO91, 2011 UJ21, 2011 UA193, P/2011 UA134, C/2011 U3, 2011 SA16
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-U101 -- 1991 TF3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 6 in MPEC 2011-U101 -- 2011 UP91, 2011 SJ68, 2011 EZ78, 2007 VG184, 2005 XM4, 2003 AA
G58Chabot Obs. in northern California, 1 in MPEC 2011-U106 -- 2011 UA193
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-U101 -- 2011 UQ91, 2011 SJ189, 2011 SE108, 2006 NM
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2011-U107 -- C/2011 U3
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-U103 & 2011-U107 -- 2011 UV192, C/2011 U3
F659Marco Micheli in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-U103 -- 2011 UV192
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2011 LC19
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2011-U101 -- 2004 QJ7, 2004 JO2, 1990 UA
G92Jarnac Obs. in Arizona, 1 in MPEC 2011-U101 -- 7092
704LINEAR in New Mexico, 8 in MPECs 2011-U101 & 2011-U106 -- 2011 UJ169, 2011 UC190, 2011 UA193, 2011 UA, 276274, 162433, 138524, 136617
B33Libbiano Obs. in Italy, 2 in MPEC 2011-U101 -- 2011 UU158, 2011 UL21
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2011-U105, 2011-U107 & 2011-U108 -- 2011 UY192, P/2011 UA134, C/2011 U3
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2011-U101, 2011-U103, 2011-U104, 2011-U105, 2011-U107 & 2011-U108 -- 2011 UY192, 2011 UX192, 2011 UV192, P/2011 UA134, C/2011 U3, 2011 TP6, 2011 TN9, 2011 QE14, 2003 HA22, 96744, 68063, 11398
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-U108 -- P/2011 UA134
H36Sandlot Obs. in Kansas, 5 in MPEC 2011-U101 -- 2011 UY63, 2011 UY114, 2011 UU158, 2011 UT91, 2011 UD21
204Schiaparelli Obs. in Italy, 3 in MPECs 2011-U104, 2011-U107 & 2011-U108 -- 2011 UX192, P/2011 UA134, C/2011 U3
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-U102 -- 2004 BX1
691Spacewatch 0.9m telescope in Arizona, 5 in MPECs 2011-U101 & 2011-U108 -- 2011 UW114, 2011 UU, 2011 UM147, P/2011 UA134, 136923
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2011-U101, 2011-U105 & 2011-U107 -- 2011 UY192, 2011 UY114, 2011 UW158, 2011 UW114, 2011 UU20, 2011 UT, 2011 US63, 2011 UM169, 2011 UL147, 2011 UA131, C/2011 U3, 2011 TP6, 2011 TL5, 2011 SU68, 2011 SQ25, 2011 SJ189, 2011 SG5, 2011 SG16
926Tenagra II Obs. in Arizona, 2 in MPECs 2011-U107 & 2011-U108 -- P/2011 UA134, C/2011 U3
B18Terskol Obs. in Russia, 2 in MPECs 2011-U107 & 2011-U108 -- P/2011 UA134, C/2011 U3
718Wiggins Obs. in Utah, 1 in MPEC 2011-U106 -- 2011 UA193
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 October '11

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. 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 CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2011 UA193JPL Sentry1901205318.8e-07-5.82-5.820JPL: "Analysis based on 23 observations spanning 2.0858 days (2011-Oct-28.25133 to 2011-Oct-30.33708)." Diameter approximately 0.041 km. from mean, weighted H=24.6.
2011 UX192JPL Sentry19012038-204433.6e-10-4.68-5.080JPL: "Analysis based on 8 observations spanning 5.5835 days (2011-Oct-24.55426 to 2011-Oct-30.13772)." Diameter approximately 1.100 km. from mean, weighted H=17.4.
2011 UM169JPL Sentry15272090-2109265.8e-05-4.40-5.030JPL: "Analysis based on 16 observations spanning 2.8424 days (2011-Oct-27.37573 to 2011-Oct-30.21816)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
NEODyS15272086-209049.84e-08-7.07-7.180NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-10-27.376 to 2011-10-30.219."
2011 UW158NEODyS15272013-2088212.52e-06-2.38-2.610NEODyS: "Based on 32 optical observations (of which 1 are rejected as outliers) from 2011-10-25.419 to 2011-10-29.224."
2011 UD21JPL Sentry1527210512.1e-06-7.93-7.930JPL: "Analysis based on 61 observations spanning 10.889 days (2011-Oct-18.42484 to 2011-Oct-29.314215)." Diameter approximately 0.006 km. from mean, weighted H=28.6.
2011 UTJPL Sentry15272034-210984.8e-06-5.76-6.290JPL: "Analysis based on 69 observations spanning 11.862 days (2011-Oct-17.41107 to 2011-Oct-29.27325)." Diameter approximately 0.025 km. from mean, weighted H=25.7.

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 30 October '11

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

2301Grabbed MPEC 2011-U108 - Comet P/2011 UA134 (Spacewatch-Panstarrs) - see above
2224Grabbed MPEC 2011-U107 - Comet C/2011 U3 (Panstarrs) - see above
1901Noted that JPL Sentry has posted 2011 UA193 as an impact risk - see above
Noted that JPL Sentry has posted 2011 UX192 as an impact risk - see above
1731Grabbed MPEC 2011-U102 - 2004 BX1 - see above
Grabbed MPEC 2011-U103 - 2011 UV192 - see above
Grabbed MPEC 2011-U104 - 2011 UX192 - see above
Grabbed MPEC 2011-U105 - 2011 UY192 - see above
Grabbed MPEC 2011-U106 - 2011 UA193 - see above
1527Noted that JPL Sentry has reposted 2011 UD21 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UM169 risk assessment - see above
Noted that NEODyS has updated its 2011 UM169 risk assessment - see above
Noted that JPL Sentry has updated its 2011 UT risk assessment - see above
Noted that NEODyS has updated its 2011 UW158 risk assessment - see above
Grabbed MPEC 2011-U101 - Daily Orbit Update - see above
0312Noted Radar Astrometry database update - see above