Contents  on 24 October '11

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

Resources:

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NEOCP Activity  on 24 October '11

The MPC's NEO Confirmation Page has 48 listings

When last checked at 2157 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 48 objects listed. Of these, 28 were "one nighters." The Tracking News counted a total of 88 listings on the NEOCP on this day.

New MPECs  on 24 October '11

Minor Planet Electronic Circulars

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


MPEC 2011-U69 - "23:02 UT" - 2011 UU106


MPEC 2011-U68 - "18:25 UT" - 2011 UT91


MPEC 2011-U67 - "18:23 UT" - 2011 US91


MPEC 2011-U66 - "18:21 UT" - 2011 UR91


MPEC 2011-U65 - "18:19 UT" - 2011 UQ91


MPEC 2011-U64 - "18:17 UT" - 2011 UP91


MPEC 2011-U63 - "18:15 UT" - 2011 UO91


MPEC 2011-U62 - "18:13 UT" - 2011 UN91


<< DOU on 24 Oct. '11 >>  MPEC 2011-U61 - "06:03 UT" - Daily Orbit Update

Observers  on 24 October '11

A total of 27 observers appeared in this day's MPECs.

CodeObserver / observatory
C60Argelander Institute for Astronomy Obs. in Germany, 1 in MPEC 2011-U61 -- 2011 TN9
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPECs 2011-U61, 2011-U62, 2011-U63, 2011-U64, 2011-U65 & 2011-U66 -- 2011 UR91, 2011 UQ91, 2011 UP91, 2011 UO91, 2011 UN91, 2011 UH20, 2011 UG20, 2011 UF10, 2011 UE21, 2011 UD, 2011 UA, 2011 SD191, 2004 HC2, 17188
A74Bergen-Enkheim Obs. in Germany, 1 in MPEC 2011-U69 -- 2011 UU106
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2011-U61 & 2011-U69 -- 2011 UU106, 2011 TA4, 2011 HC36, 2009 HV2, 2000 SH8, 96590, 85818, 85628, 36236, 7092, 6050, 3352
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2011-U61 -- 2011 UA, 2011 QD48, 2011 GD62
448Desert Moon Obs. in New Mexico, 5 in MPEC 2011-U61 -- 2011 UT, 2011 SE248, 2011 SD191, 2011 QD48, 9400
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2011-U67 & 2011-U68 -- 2011 UT91, 2011 US91
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-U64 -- 2011 UP91
379Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2011-U61 -- 2011 TN9, 2011 KF4, 2004 QJ7, 7341, 3988
240Herrenberg Obs. in Germany, 3 in MPEC 2011-U61 -- 85770, 297418, 3553
682Kanab Obs. in Utah, 2 in MPEC 2011-U61 -- 2011 UV63, 2011 US63
704LINEAR in New Mexico, 9 in MPEC 2011-U61 -- 2011 UW63, 2011 UU63, 2011 UP63, 2011 TN9, 2011 KF4, 96744, 276274, 4503, 2212
C01Lohrmann Obs. in Germany, 3 in MPEC 2011-U61 -- 2011 SR69, 2011 KF4, 297418
H01Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2011-U62, 2011-U63, 2011-U64, 2011-U65, 2011-U66, 2011-U67 & 2011-U68 -- 2011 UT91, 2011 US91, 2011 UR91, 2011 UQ91, 2011 UP91, 2011 UO91, 2011 UN91
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2011-U61, 2011-U62, 2011-U63, 2011-U64, 2011-U65 & 2011-U66 -- 2011 UR91, 2011 UQ91, 2011 UP91, 2011 UO91, 2011 UN91, 2011 SR69, 2008 RG98, 2005 BE2, 1994 RC, 159368
A13Naef Obs. in Switzerland, 1 in MPEC 2011-U61 -- 2011 OQ5
C47Nonndorf Obs. in Austria, 2 in MPEC 2011-U61 -- 2011 SQ12, 2004 JO2
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2011-U61, 2011-U67 & 2011-U68 -- 2011 UT91, 2011 US91, 2011 UD, 2007 VH186, 39572
H23Pear Tree Obs. in Florida, 2 in MPEC 2011-U61 -- 2011 TN9, 2011 SR69
461SZTE Asteroid Program in Hungary, 1 in MPEC 2011-U69 -- 2011 UU106
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-U63 -- 2011 UO91
H36Sandlot Obs. in Kansas, 7 in MPEC 2011-U61 -- 2011 UT, 2011 UQ20, 2011 UK10, 2011 UJ10, 2011 UH21, 2011 UD21, 2011 UD
204Schiaparelli Obs. in Italy, 2 in MPECs 2011-U62 & 2011-U63 -- 2011 UO91, 2011 UN91
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2011-U61 -- 285179, 162433
291Spacewatch 1.8m telescope in Arizona, 28 in MPECs 2011-U61, 2011-U63, 2011-U64, 2011-U65, 2011-U67 & 2011-U68 -- 2011 UU20, 2011 UU, 2011 UT91, 2011 UT20, 2011 UT, 2011 US91, 2011 UQ91, 2011 UP91, 2011 UO91, 2011 UL21, 2011 UK10, 2011 UH20, 2011 UG20, 2011 UF21, 2011 UA, 2011 TL5, 2011 SW71, 2011 SV71, 2011 SU68, 2011 SJ189, 2011 SH189, 2011 SE108, 2011 SD173, 2011 SB16, 2011 QY11, 2011 QP96, 2011 QH21, 2006 GU
B18Terskol Obs. in Russia, 2 in MPECs 2011-U67 & 2011-U69 -- 2011 UU106, 2011 US91
H47Vicksburg Obs. in Mississippi, 9 in MPEC 2011-U61 -- 90075, 24475, 163081, 154302, 138883, 138524, 138155, 137799, 8567
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 October '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2205 and JPL at 2156 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 US63JPL Sentry12452058-210778.1e-09-4.63-5.080JPL: "Analysis based on 47 observations spanning 2.0919 days (2011-Oct-21.25465 to 2011-Oct-23.34659)." Diameter approximately 0.880 km. from mean, weighted H=17.9.
2011 UL21JPL Sentry21082026-2111684.9e-07-1.26-1.940JPL: "Analysis based on 54 observations spanning 6.0276 days (2011-Oct-17.48272 to 2011-Oct-23.51036)." Diameter approximately 2.600 km. from mean, weighted H=15.6.
NEODyS12452026-2090594.3e-07-1.25-1.860NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2011-10-17.483 to 2011-10-23.511."
2011 UD21JPL Sentry1245208811.1e-07-9.15-9.150JPL: "Analysis based on 49 observations spanning 4.8832 days (2011-Oct-18.42484 to 2011-Oct-23.308005)." Diameter approximately 0.006 km. from mean, weighted H=28.6.
2011 UH20JPL Sentry12452050-2109102.1e-06-3.41-3.700JPL: "Analysis based on 41 observations spanning 5.9805 days (2011-Oct-18.15098 to 2011-Oct-24.13146)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
NEODyS12452050-208585.71e-07-3.99-4.260NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2011-10-18.152 to 2011-10-24.132."
2011 UG20JPL Sentry1245211117.9e-08-5.30-5.300JPL: "Analysis based on 64 observations spanning 5.9853 days (2011-Oct-18.1144 to 2011-Oct-24.09968)." Diameter approximately 0.180 km. from mean, weighted H=21.3.
2011 UTJPL Sentry12452034-210984.8e-06-5.75-6.280JPL: "Analysis based on 58 observations spanning 6.0161 days (2011-Oct-17.41107 to 2011-Oct-23.42717)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
NEODyS12452034-208841.23e-06-6.07-6.330NEODyS: "Based on 58 optical observations (of which 0 are rejected as outliers) from 2011-10-17.412 to 2011-10-23.428."
2011 SD173JPL Sentry12452062-2090111.9e-07-4.11-4.270JPL: "Analysis based on 44 observations spanning 28.885 days (2011-Sep-24.42522 to 2011-Oct-23.31035)." Diameter approximately 0.420 km. from mean, weighted H=19.5.
NEODyS12452062-2090141.45e-07-4.24-4.490NEODyS: "Based on 45 optical observations (of which 1 are rejected as outliers) from 2011-09-24.426 to 2011-10-23.311."

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 24 October '11

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

0325 10/25Grabbed MPEC 2011-U69 - 2011 UU106 - see above
2108Noted that JPL Sentry has updated its 2011 UL21 risk assessment - see above
1951Grabbed MPEC 2011-U62 - 2011 UN91 - see above
Grabbed MPEC 2011-U63 - 2011 UO91 - see above
Grabbed MPEC 2011-U64 - 2011 UP91 - see above
Grabbed MPEC 2011-U65 - 2011 UQ91 - see above
Grabbed MPEC 2011-U66 - 2011 UR91 - see above
Grabbed MPEC 2011-U67 - 2011 US91 - see above
Grabbed MPEC 2011-U68 - 2011 UT91 - see above
1245Noted 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 posted 2011 UD21 as an impact risk - see above
Noted that JPL Sentry has posted 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 updated its 2011 UH20 risk assessment - see above
Noted that NEODyS has updated its 2011 UL21 risk assessment - see above
Noted that JPL Sentry has updated its 2011 US63 risk assessment - see above
Noted that JPL Sentry has updated its 2011 UT risk assessment - see above
Noted that NEODyS has updated its 2011 UT risk assessment - see above
Grabbed MPEC 2011-U61 - Daily Orbit Update - see above