Contents  on 31 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 31 October '11

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 41 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 31 October '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been nine MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-U117 - "23:16 UT" - 2011 UF256


MPEC 2011-U116 - "23:15 UT" - 2011 UE256


MPEC 2011-U115 - "23:13 UT" - 2011 UD256


MPEC 2011-U114 - "16:55 UT" - 2011 UZ255


MPEC 2011-U113 - "16:52 UT" - 2011 UY255


MPEC 2011-U112 - "16:50 UT" - 2011 UX255


MPEC 2011-U111 - "16:46 UT" - 2011 UW255


MPEC 2011-U110 - "15:21 UT" - 2011 UC115


<< DOU on 31 Oct. '11 >>  MPEC 2011-U109 - "06:05 UT" - Daily Orbit Update

Observers  on 31 October '11

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2011-U109, 2011-U114 & 2011-U117 -- 2011 UZ255, 2011 UY114, 2011 UW63, 2011 UT91, 2011 US91, 2011 UR91, 2011 UP63, 2011 UF256, 2011 UF10, 2011 UD115, 2011 UB131, 2011 UA131, 2011 TQ8, 2011 ST232, 2011 RX, 2011 PU, 2011 NZ
G51Byrne Obs. in southern California, 1 in MPEC 2011-U109 -- 2011 UX192
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2011-U109 & 2011-U113 -- 2011 UY255, 2011 UJ169, 2011 UD64, 2011 TP6, 2011 HC36, 2006 HX5, 1990 UA, 96590, 85628, 276274, 7092
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 11 in MPECs 2011-U109 & 2011-U113 -- 2011 UY255, 2011 UX114, 2011 UT63, 2011 UM169, 2011 UL169, 2011 SK16, 2011 QE14, 2011 OL51, 2011 LL2, 2011 JP29, 2011 GC60
G58Chabot Obs. in northern California, 7 in MPEC 2011-U109 -- 2011 UZ63, 2011 UZ114, 2011 US91, 2011 UJ169, 2011 UD21, 2011 UB131, 1998 ME3
448Desert Moon Obs. in New Mexico, 4 in MPEC 2011-U109 -- 2011 UA, 2011 JP29, 2002 KH3, 99799
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPECs 2011-U109, 2011-U112 & 2011-U116 -- 2011 UX255, 2011 UE256, 2011 UA115
157Frasso Sabino Obs. in Italy, 3 in MPEC 2011-U109 -- 2011 US63, 2011 UP63, 2003 FH
C73Galati Obs. in Romania, 2 in MPEC 2011-U109 -- 2003 FH, 138524
704LINEAR in New Mexico, 9 in MPEC 2011-U109 -- 2011 UA193, 2011 UA, 2011 HC36, 2006 HX5, 2004 QJ7, 85709, 159368, 136617, 7092
932McCarthy Obs. in Connecticut, 2 in MPECs 2011-U109 & 2011-U114 -- 2011 UZ255, 2011 UD115
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2011-U109, 2011-U110, 2011-U111, 2011-U112, 2011-U115, 2011-U116 & 2011-U117 -- 2011 UX255, 2011 UW255, 2011 UQ91, 2011 UL147, 2011 UF256, 2011 UE256, 2011 UD256, 2011 UC115, 2011 SU232, 2011 QY11, 2011 KF4, 2006 SX217, 90075, 232382, 18736, 163081, 152942, 6489
A13Naef Obs. in Switzerland, 1 in MPEC 2011-U109 -- 4183
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2011-U109 -- 2011 SR69, 2004 FH11, 2201
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-U113 -- 2011 UY255
233San Vito Obs. in Italy, 1 in MPEC 2011-U109 -- 2004 JO2
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-U111 & 2011-U112 -- 2011 UX255, 2011 UW255
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2011-U109 & 2011-U114 -- 2011 UZ255, 2011 UU, 2001 UE5, 2201
291Spacewatch 1.8m telescope in Arizona, 18 in MPECs 2011-U109, 2011-U110, 2011-U111, 2011-U112, 2011-U113, 2011-U114, 2011-U115, 2011-U116 & 2011-U117 -- 2011 UZ63, 2011 UZ255, 2011 UY255, 2011 UX255, 2011 UW255, 2011 UW158, 2011 UU, 2011 UM147, 2011 UL21, 2011 UH20, 2011 UF256, 2011 UE256, 2011 UD256, 2011 UC115, 2011 SV71, 2011 SH189, 2011 SF173, 2010 FQ
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2011-U111 & 2011-U112 -- 2011 UX255, 2011 UW255
B18Terskol Obs. in Russia, 4 in MPECs 2011-U111, 2011-U114, 2011-U115 & 2011-U116 -- 2011 UZ255, 2011 UW255, 2011 UE256, 2011 UD256
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2011-U109 -- 2011 UU106, 2005 NX44, 2004 JO2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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 UZ255JPL Sentry19482063-2107247.5e-06-4.48-4.910JPL: "Analysis based on 21 observations spanning .98813 days (2011-Oct-30.44574 to 2011-Oct-31.43387)." Diameter approximately 0.072 km. from mean, weighted H=23.4.
2011 UW255JPL Sentry19482021-21113673.2e-06-4.80-5.890JPL: "Analysis based on 22 observations spanning 1.0036 days (2011-Oct-30.16049 to 2011-Oct-31.164119)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
2011 UA193JPL Sentry1653205321.3e-06-5.62-5.640JPL: "Analysis based on 28 observations spanning 2.0858 days (2011-Oct-28.25133 to 2011-Oct-30.33708)." Diameter approximately 0.042 km. from mean, weighted H=24.5.
NEODyS16532053-205329.79e-07-5.76-5.770NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2011-10-28.252 to 2011-10-30.338."
2011 UX192NEODyS16532026-2082165.13e-10-4.32-5.150NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-10-24.555 to 2011-10-30.235."
JPL Sentry1653R E M O V E DJPL: Risk listing removed at 0935 UTC.
2011 UM169JPL Sentry16532090-2107235.5e-05-4.43-4.780JPL: "Analysis based on 19 observations spanning 2.8627 days (2011-Oct-27.37573 to 2011-Oct-30.23838)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
NEODyS1653R E M O V E D-
2011 UL169JPL Sentry16532057-207351.2e-05-6.54-6.560JPL: "Analysis based on 23 observations spanning 2.9228 days (2011-Oct-27.2919 to 2011-Oct-30.21473)." Diameter approximately 0.008 km. from mean, weighted H=28.3.
NEODyS16532057-206771.25e-05-6.52-6.580NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2011-10-27.293 to 2011-10-30.215."
2011 UW158JPL Sentry18342015-21112242.4e-05-1.41-1.460JPL: "Analysis based on 35 observations spanning 4.9861 days (2011-Oct-25.4186 to 2011-Oct-30.40472)." Diameter approximately 0.446 km. from mean, weighted H=19.4.
NEODyS16532015-2087218.42e-06-1.56-1.640NEODyS: "Based on 35 optical observations (of which 2 are rejected as outliers) from 2011-10-25.419 to 2011-10-30.405."
2011 UL21JPL Sentry16532035-2109172.5e-07-1.73-2.180JPL: "Analysis based on 84 observations spanning 13.012 days (2011-Oct-17.48272 to 2011-Oct-30.49493)." Diameter approximately 2.500 km. from mean, weighted H=15.7.
NEODyS16532032-2068118.01e-08-2.22-2.570NEODyS: "Based on 84 optical observations (of which 0 are rejected as outliers) from 2011-10-17.483 to 2011-10-30.496."
2011 UD21JPL Sentry1653210512.4e-06-7.86-7.860JPL: "Analysis based on 64 observations spanning 11.880 days (2011-Oct-18.42484 to 2011-Oct-30.30467)." Diameter approximately 0.007 km. from mean, weighted H=28.6.

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 31 October '11

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

2359Grabbed MPEC 2011-U115 - 2011 UD256 - see above
Grabbed MPEC 2011-U116 - 2011 UE256 - see above
Grabbed MPEC 2011-U117 - 2011 UF256 - see above
1948Noted that JPL Sentry has posted 2011 UW255 as an impact risk - see above
Noted that JPL Sentry has posted 2011 UZ255 as an impact risk - see above
1834Noted that JPL Sentry has updated its 2011 UW158 risk assessment - see above
Grabbed MPEC 2011-U113 - 2011 UY255 - see above
Grabbed MPEC 2011-U114 - 2011 UZ255 - see above
1653Noted that JPL Sentry has updated its 2011 UA193 risk assessment - see above
Noted that NEODyS has posted 2011 UA193 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UD21 risk assessment - see above
Noted that JPL Sentry has updated its 2011 UL169 risk assessment - see above
Noted that NEODyS has updated its 2011 UL169 risk assessment - 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 updated its 2011 UM169 risk assessment - see above
Noted that NEODyS has removed 2011 UM169 as an impact risk - see above
Noted that NEODyS has updated its 2011 UW158 risk assessment - see above
Noted that JPL Sentry has removed 2011 UX192 as an impact risk - see above
Noted that NEODyS has posted 2011 UX192 as an impact risk - see above
Grabbed MPEC 2011-U109 - Daily Orbit Update - see above
Grabbed MPEC 2011-U110 - 2011 UC115 - see above
Grabbed MPEC 2011-U111 - 2011 UW255 - see above
Grabbed MPEC 2011-U112 - 2011 UX255 - see above