Contents  on 20 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.

Radar Astrometry  on 20 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 2359 UTC when the database was dated 20 Oct.

NEOCP Activity  on 20 October '11

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 42 listings on the NEOCP today.

New MPECs  on 20 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-U31 - "22:42 UT" - 2011 UU20


MPEC 2011-U30 - "21:26 UT" - 2011 UT20


MPEC 2011-U29 - "17:44 UT" - 2011 UQ20


MPEC 2011-U28 - "17:42 UT" - 2011 UP20


MPEC 2011-U27 - "17:40 UT" - 2011 UN20


MPEC 2011-U26 - "17:38 UT" - 2011 UJ20


MPEC 2011-U25 - "17:36 UT" - 2011 UH20


MPEC 2011-U24 - "17:30 UT" - 2011 UG20


<< DOU on 20 Oct. '11 >>  MPEC 2011-U23 - "06:03 UT" - Daily Orbit Update

Observers  on 20 October '11

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2011-U24 -- 2011 UG20
251Arecibo in Puerto Rico, 1 in radar -- 2011 SQ12
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-U24 -- 2011 UG20
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2011-U23 & 2011-U24 -- 2011 UG20, 2011 SL102, 2009 SK1, 2009 HV2, 2006 HX5, 2004 FH11, 2001 UE5, 85713, 36236, 138155, 8035, 2212, 1943
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2011-U23, 2011-U25, 2011-U27, 2011-U29, 2011-U30 & 2011-U31 -- 2011 UU20, 2011 UT20, 2011 UT, 2011 UQ20, 2011 UN20, 2011 UH20, 2011 SJ16
I39Cruz del Sur Obs. in Argentina, 2 in MPEC 2011-U23 -- 2011 TN9, 2011 HC36
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-U23 -- 2011 UT
F65#program code "#" (12) via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-U23 -- 2011 UT
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 4 in MPECs 2011-U24, 2011-U27, 2011-U30 & 2011-U31 -- 2011 UU20, 2011 UT20, 2011 UN20, 2011 UG20
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-U27 -- 2011 UN20
E10Faulkes Telescope South in New South Wales, 2 in MPECs 2011-U23 & 2011-U25 -- 2011 UK10, 2011 UH20
J95Great Shefford Obs. in England, 3 in MPECs 2011-U24, 2011-U27 & 2011-U30 -- 2011 UT20, 2011 UN20, 2011 UG20
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2011-U23 -- 2011 LJ19
246KLENOT in the Czech Republic, 3 in MPEC 2011-U23 -- 2011 UT, 2011 TN9, 2011 TA4
704LINEAR in New Mexico, 6 in MPECs 2011-U23 & 2011-U25 -- 2011 UH20, 2011 SM68, 2004 QJ7, 1990 UA, 190491, 162980
118Modra Obs. in Slovakia, 2 in MPECs 2011-U30 & 2011-U31 -- 2011 UU20, 2011 UT20
900Moriyama Obs. in Japan, 1 in MPEC 2011-U24 -- 2011 UG20
G96Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2011-U23, 2011-U24, 2011-U26, 2011-U27, 2011-U28 & 2011-U29 -- 2011 UQ20, 2011 UP20, 2011 UN20, 2011 UJ20, 2011 UG20, 2011 QF3, 2010 VC1, 2001 UE5, 297274, 163373
C39Nijmegen Obs., 3 in MPEC 2011-U23 -- 96189, 297418, 219071
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2011-U23, 2011-U30 & 2011-U31 -- 2011 UU20, 2011 UT20, 2011 TL5, 2011 RF, 1991 TF3, 1990 UO, 194386
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2011-U23 -- 90075, 155140, 4183
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-U24 -- 2011 UG20
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-U24 -- 2011 UG20
H36Sandlot Obs. in Kansas, 5 in MPECs 2011-U24, 2011-U25, 2011-U27, 2011-U30 & 2011-U31 -- 2011 UU20, 2011 UT20, 2011 UN20, 2011 UH20, 2011 UG20
E12Siding Spring Survey in New South Wales, 1 in MPEC 2011-U23 -- 2011 UL10
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2011-U23 -- 2011 UU, 2011 SO25, 2011 EF17, 285179, 5131, 2212
291Spacewatch 1.8m telescope in Arizona, 22 in MPECs 2011-U23, 2011-U24, 2011-U27, 2011-U28 & 2011-U29 -- 2011 UU, 2011 UT, 2011 UQ20, 2011 UP20, 2011 UN20, 2011 UG20, 2011 UA, 2011 TQ8, 2011 TA4, 2011 SW71, 2011 SV71, 2011 SU68, 2011 SU67, 2011 SG16, 2011 SF173, 2011 SA16, 2011 QE48, 2011 QC46, 2010 OC103, 2005 PO, 2003 YS17, 1988 TA
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2011-U24 & 2011-U27 -- 2011 UN20, 2011 UG20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 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 CLOMON 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 UH20JPL Sentry20482030-2109721.3e-06-3.57-4.540JPL: "Analysis based on 17 observations spanning 2.0390 days (2011-Oct-18.15098 to 2011-Oct-20.189945)." Diameter approximately 0.240 km. from mean, weighted H=20.8.
2011 UTJPL Sentry14522034-210996.4e-06-5.80-6.390JPL: "Analysis based on 35 observations spanning 2.0516 days (2011-Oct-17.41107 to 2011-Oct-19.46266)." Diameter approximately 0.023 km. from mean, weighted H=25.8.
NEODyS14522034-204931.69e-06-6.03-6.450NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2011-10-17.412 to 2011-10-19.463."

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 20 October '11

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

2359Noted Radar Astrometry database update - see above
2250Grabbed MPEC 2011-U31 - 2011 UU20 - see above
2146Grabbed MPEC 2011-U30 - 2011 UT20 - see above
2048Noted that JPL Sentry has posted 2011 UH20 as an impact risk - see above
1826Grabbed MPEC 2011-U24 - 2011 UG20 - see above
Grabbed MPEC 2011-U25 - 2011 UH20 - see above
Grabbed MPEC 2011-U26 - 2011 UJ20 - see above
Grabbed MPEC 2011-U27 - 2011 UN20 - see above
Grabbed MPEC 2011-U28 - 2011 UP20 - see above
Grabbed MPEC 2011-U29 - 2011 UQ20 - see above
1452Noted 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-U23 - Daily Orbit Update - see above