Contents  on 26 October '11

Note: These A/CC news pages will update more irregularly and less frequently than usual through Sunday, October 30th.

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 26 October '11

The MPC's NEO Confirmation Page has 62 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 62 objects listed. Of these, 35 were "one nighters." So far The Tracking News has counted a total of 70 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 26 October '11

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-U85 - "19:10 UT" - Comet C/2011 U2 (Bressi)


MPEC 2011-U84 - "18:39 UT" - Comet P/2011 U1 (Panstarrs)


MPEC 2011-U83 - "16:35 UT" - 2011 UM147


MPEC 2011-U82 - "16:33 UT" - 2011 UL147


<< DOU on 26 Oct. '11 >>  MPEC 2011-U81 - "06:04 UT" - Daily Orbit Update

Observers  on 26 October '11

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2011-U81 -- 297418, 283460, 7341
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2011-U81, 2011-U82 & 2011-U83 -- 2011 US91, 2011 US63, 2011 UR63, 2011 UQ91, 2011 UN91, 2011 UM147, 2011 UL147, 2011 UK21, 2011 UJ21, 2011 UH20, 2011 UG20, 2011 UD, 2011 TN9, 2011 TK, 2011 SQ12, 2011 SO32, 2011 RR12
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-U81 -- 2004 TN
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 16 in MPEC 2011-U81 -- 2011 UU63, 2011 UT63, 2011 UQ63, 2011 UK10, 2011 UH20, 2011 UG21, 2011 UG20, 2011 UF21, 2011 TP6, 2011 SZ15, 2011 SE16, 2011 QF23, 2011 QF14, 2011 OY17, 2011 OC18, 2011 MD5
I70Edney House Obs., 1 in MPEC 2011-U81 -- 297418
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2011-U81 -- 2011 SD191
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-U85 -- C/2011 U2
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-U83 & 2011-U84 -- 2011 UM147, P/2011 U1
704LINEAR in New Mexico, 1 in MPEC 2011-U81 -- 16960
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-U82 -- 2011 UL147
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-U84 -- P/2011 U1
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2011-U82 -- 2011 UL147
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPECs 2011-U81, 2011-U83 & 2011-U84 -- 2011 US91, 2011 UM147, P/2011 U1, 2007 VQ4, 2004 FH11, 52768, 285331, 276786, 20429, 162433, 154330, 152942
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2011-U81 -- 2011 UD, 2011 TA4
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2011-U81 -- 2011 SR69, 4183
H06*Rolando Ligustri in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-U85 -- C/2011 U2
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPECs 2011-U81 & 2011-U85 -- 2011 UD115, C/2011 U2, 2010 JF
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2011-U81 & 2011-U85 -- C/2011 U2, 2010 JF, 42286, 136923
291Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2011-U81, 2011-U83, 2011-U84 & 2011-U85 -- 2011 UU20, 2011 UU106, 2011 UT20, 2011 US63, 2011 UM147, 2011 UL21, 2011 UH20, 2011 UG20, 2011 UG10, 2011 UA, C/2011 U2, P/2011 U1, 2011 TC4, 2011 TA4, 2010 JF
926Tenagra II Obs. in Arizona, 2 in MPECs 2011-U83 & 2011-U84 -- 2011 UM147, P/2011 U1
B18Terskol Obs. in Russia, 1 in MPEC 2011-U85 -- C/2011 U2
H47Vicksburg Obs. in Mississippi, 3 in MPEC 2011-U81 -- 2011 TA4, 37336, 16960
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2011-U81 -- 2011 UD, 2011 SR69, 2004 JO2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 CLOMON2 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 UA131NEODyS16172022-2089347.33e-10-5.00-5.810NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2011-10-23.444 to 2011-10-25.384."
JPL Sentry0539203211.1e-10-5.66-5.660JPL: "Analysis based on 16 observations spanning 1.9404 days (2011-Oct-23.44296 to 2011-Oct-25.38338)." Diameter approximately 1.100 km. from mean, weighted H=17.5.
2011 US63JPL Sentry1617R E M O V E DJPL: Risk listing removed at 0930 UTC.
2011 UR63JPL Sentry1617R E M O V E DJPL: Risk listing removed at 0853 UTC.
2011 UL21JPL Sentry16172026-2109529.3e-07-1.03-1.740JPL: "Analysis based on 60 observations spanning 8.0260 days (2011-Oct-17.48272 to 2011-Oct-25.50868)." Diameter approximately 2.600 km. from mean, weighted H=15.6.
NEODyS16172029-2088421.19e-06-0.88-1.461NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2011-10-17.483 to 2011-10-25.509."
2011 UH20JPL Sentry16172054-205849.8e-09-5.78-6.040JPL: "Analysis based on 50 observations spanning 7.9918 days (2011-Oct-18.15098 to 2011-Oct-26.1428)." Diameter approximately 0.210 km. from mean, weighted H=21.0.
NEODyS1617R E M O V E D-
2011 UG20JPL Sentry1617R E M O V E DJPL: Risk listing removed at 0943 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 26 October '11

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

2034Grabbed MPEC 2011-U84 - Comet P/2011 U1 (Panstarrs) - see above
Grabbed MPEC 2011-U85 - Comet C/2011 U2 (Bressi) - see above
1710Grabbed MPEC 2011-U82 - 2011 UL147 - see above
Grabbed MPEC 2011-U83 - 2011 UM147 - see above
1617Noted that NEODyS has posted 2011 UA131 as an impact risk - see above
Noted that JPL Sentry has removed 2011 UG20 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UH20 risk assessment - see above
Noted that NEODyS has removed 2011 UH20 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UL21 risk assessment - see above
Noted that NEODyS has updated its 2011 UL21 risk assessment - see above
Noted that JPL Sentry has removed 2011 UR63 as an impact risk - see above
Noted that JPL Sentry has removed 2011 US63 as an impact risk - see above
Grabbed MPEC 2011-U81 - Daily Orbit Update - see above
0539Noted that JPL Sentry has posted 2011 UA131 as an impact risk - see above