Contents  on 28 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 28 October '11

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2025 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 46 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 28 October '11

Minor Planet Electronic Circulars

As of last check at 2025 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-U96 - "17:49 UT" - 2011 UJ169


MPEC 2011-U95 - "17:14 UT" - 2011 UM169


MPEC 2011-U94 - "17:13 UT" - 2011 UL169


MPEC 2011-U93 - "11:52 UT" - 2011 UH169


MPEC 2011-U92 - "11:47 UT" - 2011 UG169


<< DOU on 28 Oct. '11 >>  MPEC 2011-U91 - "06:04 UT" - Daily Orbit Update

Observers  on 28 October '11

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
J16An Carraig Obs. in Northern Ireland, 3 in MPEC 2011-U91 -- 37336, 297418, 219071
300Bisei Spaceguard Center in Japan, 3 in MPECs 2011-U94, 2011-U95 & 2011-U96 -- 2011 UM169, 2011 UL169, 2011 UJ169
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2011-U91, 2011-U94, 2011-U95 & 2011-U96 -- 2011 UM169, 2011 UL169, 2011 UJ169, 2011 UD64, 2011 SL102, 2011 KF4, 2011 GX65, 2004 FH11, 96744, 85839, 138524
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2011-U91 -- 2011 UU63, 2011 UT63
821Cordoba-Bosque Alegre Obs., 2 in MPECs 2011-U94 & 2011-U96 -- 2011 UL169, 2011 UJ169
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 3 in MPECs 2011-U91, 2011-U92 & 2011-U93 -- 2011 UL21, 2011 UH169, 2011 UG169
C73Galati Obs. in Romania, 5 in MPEC 2011-U91 -- 2011 UD, 2011 TA4, 20826, 5653, 2061
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2011-U91 -- 2011 TN9, 2011 SR69, 2011 KF4, 7341
695]Mark Trueblood via Kitt Peak Natl. Obs. (KPNO) in Arizona, 5 in MPEC 2011-U91 -- 2011 UV63, 2011 UT20, 2011 UL21, 2011 TN9, 2011 LJ19
900Moriyama Obs. in Japan, 1 in MPEC 2011-U96 -- 2011 UJ169
474Mt. John Obs. in New Zealand, 10 in MPEC 2011-U91 -- 2011 UU63, 2011 UH20, 2011 UG21, 2011 UG20, 2011 UA, 2011 TK5, 2011 SR25, 2011 SO26, 2011 QD48, 2011 OP24
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2011-U91 -- 2011 SL102, 2006 FJ9, 267337
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2011-U91, 2011-U92 & 2011-U93 -- 2011 UH169, 2011 UG169, 67367, 144900
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-U91 -- 2011 UL21
104San Marcello Pistoiese Obs. in Italy, 7 in MPECs 2011-U91, 2011-U93, 2011-U94, 2011-U95 & 2011-U96 -- 2011 UM169, 2011 UL21, 2011 UL169, 2011 UJ169, 2011 UH169, 2011 SO25, 2011 SL102
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-U91 -- 2011 EF17, 2212
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2011-U91, 2011-U94 & 2011-U95 -- 2011 UV63, 2011 UU20, 2011 UT20, 2011 UT, 2011 US63, 2011 UM169, 2011 UL169, 2011 UE21, 2011 TJ, 2011 TA4, 2011 SD173
B18Terskol Obs. in Russia, 1 in MPEC 2011-U96 -- 2011 UJ169
H47Vicksburg Obs. in Mississippi, 3 in MPEC 2011-U91 -- 2011 SL102, 8567, 3200
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 October '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2025 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 UM169JPL Sentry19432080-2110353.2e-05-4.64-5.350JPL: "Analysis based on 13 observations spanning .90129 days (2011-Oct-27.37573 to 2011-Oct-28.27702)." Diameter approximately 0.035 km. from mean, weighted H=24.9.
2011 UL169JPL Sentry19432057-207151.2e-05-6.55-6.600JPL: "Analysis based on 20 observations spanning .97834 days (2011-Oct-27.2919 to 2011-Oct-28.27024)." Diameter approximately 0.007 km. from mean, weighted H=28.3.
2011 UG169JPL Sentry15442013-21115122.0e-06-6.10-7.140JPL: "Analysis based on 9 observations spanning .86057 days (2011-Oct-24.43013 to 2011-Oct-25.290705)." Diameter approximately 0.020 km. from mean, weighted H=26.2.
2011 UW158JPL Sentry17152013-21113978.5e-06-1.73-1.930JPL: "Analysis based on 29 observations spanning 1.8173 days (2011-Oct-25.4186 to 2011-Oct-27.23593)." Diameter approximately 0.449 km. from mean, weighted H=19.4.
NEODyS15412013-2090772.93e-06-1.99-2.080NEODyS: "Based on 29 optical observations (of which 1 are rejected as outliers) from 2011-10-25.419 to 2011-10-27.237."
2011 UV158NEODyS15412017-2090513.8e-08-5.44-5.980NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2011-10-24.547 to 2011-10-25.354."
2011 UL21JPL Sentry15442032-2110321.2e-06-0.92-1.461JPL: "Analysis based on 77 observations spanning 10.693 days (2011-Oct-17.48272 to 2011-Oct-28.17568)." Diameter approximately 2.500 km. from mean, weighted H=15.6.
NEODyS15412032-2088256.52e-07-1.22-1.831NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2011-10-17.483 to 2011-10-28.176."
2011 UTJPL Sentry15442034-2110104.9e-06-5.75-6.290JPL: "Analysis based on 66 observations spanning 10.787 days (2011-Oct-17.41107 to 2011-Oct-28.19783)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
2011 SD173JPL Sentry1544R E M O V E DJPL: Risk listing removed at 0850 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 28 October '11

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

1943Noted that JPL Sentry has posted 2011 UL169 as an impact risk - see above
Noted that JPL Sentry has posted 2011 UM169 as an impact risk - see above
Grabbed MPEC 2011-U95 - 2011 UM169 - see above
Grabbed MPEC 2011-U96 - 2011 UJ169 - see above
1715Noted that JPL Sentry has posted 2011 UW158 as an impact risk - see above
Grabbed MPEC 2011-U94 - 2011 UL169 - see above
1544Noted that JPL Sentry has removed 2011 SD173 as an impact risk - see above
Noted that JPL Sentry has posted 2011 UG169 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UL21 risk assessment - see above
Noted that JPL Sentry has updated its 2011 UT risk assessment - see above
1541Noted that NEODyS has updated its 2011 UL21 risk assessment - see above
Noted that NEODyS has posted 2011 UV158 as an impact risk - see above
Noted that NEODyS has posted 2011 UW158 as an impact risk - see above
Grabbed MPEC 2011-U91 - Daily Orbit Update - see above
Grabbed MPEC 2011-U92 - 2011 UG169 - see above
Grabbed MPEC 2011-U93 - 2011 UH169 - see above