Contents  on 17 November '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 17 November '11

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 21 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 17 November '11

Minor Planet Electronic Circulars

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


<< DOU on 17 Nov. '11 >>  MPEC 2011-W08 - "06:04 UT" - Daily Orbit Update


MPEC 2011-W07 - "02:13 UT" - 2011 WD


MPEC 2011-W06 - "02:11 UT" - 2011 WC


MPEC 2011-W05 - "02:09 UT" - 2011 WB


MPEC 2011-W04 - "02:07 UT" - 2011 WA

Observers  on 17 November '11

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
C60Argelander Institute for Astronomy Obs. in Germany, 4 in MPEC 2011-W08 -- 2005 YU55, 209924, 175706, 137084
300Bisei Spaceguard Center in Japan, 1 in MPEC 2011-W04 -- 2011 WA
160Castelmartini Obs. in Italy, 9 in MPECs 2011-W04 & 2011-W08 -- 2011 WA, 2011 UZ275, 2011 UU106, 2011 SR69, 2011 LC19, 2005 YU55, 170502, 163081, 138852
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2011-W04, 2011-W06 & 2011-W08 -- 2011 WC, 2011 WA, 2011 UU158, 2011 TN9, 2011 MD11, 2004 JO2, 53110, 303174, 301844, 26760, 219071, 3554
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2011-W04 & 2011-W08 -- 2011 WA, 2011 UU158, 2011 SR69, 2005 YU55
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2011-W08 -- 154330
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2011-W04 -- 2011 WA
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2011-W04 -- 2011 WA
C81Dolomites Obs. in Italy, 1 in MPEC 2011-W04 -- 2011 WA
639Dresden Obs. in Germany, 1 in MPEC 2011-W08 -- 2005 YU55
595Farra d'Isonzo Obs. in Italy, 3 in MPECs 2011-W04, 2011-W06 & 2011-W08 -- 2011 WC, 2011 WA, 2011 VG9
B15Inastars Obs. in Germany, 1 in MPEC 2011-W04 -- 2011 WA
704LINEAR in New Mexico, 3 in MPEC 2011-W08 -- 2010 JF, 2005 XB1, 138883
G47MPC code G47, 1 in MPEC 2011-W08 -- 2005 YU55
B28Mandi Obs. in Italy, 2 in MPECs 2011-W04 & 2011-W06 -- 2011 WC, 2011 WA
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-W08 -- 2011 SO25
900Moriyama Obs. in Japan, 1 in MPEC 2011-W04 -- 2011 WA
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2011-W05, 2011-W07 & 2011-W08 -- 2011 WD, 2011 WB, 2005 YU55, 85818, 42286, 136923
C39Nijmegen Obs., 1 in MPEC 2011-W08 -- 2005 YU55
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2011-W08 -- 2003 VE1, 250680
D29Purple Mtn. Obs. Xuyi Station in China, 3 in MPEC 2011-W08 -- 2011 TN9, 162273, 2201
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-W04 -- 2011 WA
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2011-W04 -- 2011 WA
104San Marcello Pistoiese Obs. in Italy, 2 in MPECs 2011-W04 & 2011-W06 -- 2011 WC, 2011 WA
204Schiaparelli Obs. in Italy, 4 in MPECs 2011-W04, 2011-W05, 2011-W06 & 2011-W07 -- 2011 WD, 2011 WC, 2011 WB, 2011 WA
510Siegen Obs. in Germany, 1 in MPEC 2011-W04 -- 2011 WA
291Spacewatch 1.8m telescope in Arizona, 32 in MPECs 2011-W04, 2011-W05, 2011-W06, 2011-W07 & 2011-W08 -- 2011 WD, 2011 WC, 2011 WB, 2011 WA, 2011 VR5, 2011 VQ5, 2011 VP5, 2011 VH5, 2011 UZ255, 2011 UY114, 2011 UX114, 2011 UW158, 2011 UW114, 2011 UV63, 2011 UV158, 2011 UU158, 2011 UT20, 2011 UN20, 2011 UM147, 2011 UH169, 2011 UG256, 2011 UE256, 2011 UD256, 2011 UD115, 2011 UA276, 2011 TP6, 2011 SU232, 2011 SP68, 2011 SH189, 2011 SD173, 2010 SO16, 2003 YS17
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2011-W07 -- 2011 WD
6731program code 1 via Table Mtn. Obs. in southern California, 1 in MPEC 2011-W08 -- 1036
G69Thousand Oaks Obs. in southern California, 1 in MPEC 2011-W08 -- 2005 YU55
718Wiggins Obs. in Utah, 1 in MPEC 2011-W04 -- 2011 WA
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 17 November '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 VG9NEODyS18422085-208632.28e-06-4.05-4.360NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2011-11-15.379 to 2011-11-16.954."
JPL Sentry16562039-2111202.0e-06-4.12-4.580JPL #2 for the day: "Analysis based on 25 observations spanning 1.5752 days (2011-Nov-15.37847 to 2011-Nov-16.95363)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
2011 UZ255JPL Sentry16562066-208931.1e-05-4.15-4.190JPL: "Analysis based on 73 observations spanning 17.747 days (2011-Oct-30.44574 to 2011-Nov-17.19277)." Diameter approximately 0.075 km. from mean, weighted H=23.3.
NEODyS16562066-208947.34e-06-4.33-4.40NEODyS: "Based on 73 optical observations (of which 0 are rejected as outliers) from 2011-10-30.447 to 2011-11-17.194."
2011 UW158JPL Sentry1656R E M O V E DJPL: Risk listing removed at 0850 UTC.
NEODyS1656R E M O V E D-

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 17 November '11

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

1656Noted that JPL Sentry has removed 2011 UW158 as an impact risk - see above
Noted that NEODyS has removed 2011 UW158 as an impact risk - see above
Noted that JPL Sentry has updated its 2011 UZ255 risk assessment - see above
Noted that NEODyS has updated its 2011 UZ255 risk assessment - see above
Noted that JPL Sentry has updated its 2011 VG9 risk assessment - see above
Noted that NEODyS has posted 2011 VG9 as an impact risk - see above
Grabbed MPEC 2011-W08 - Daily Orbit Update - see above
0604Grabbed MPEC 2011-W04 - 2011 WA - see above
Grabbed MPEC 2011-W05 - 2011 WB - see above
Grabbed MPEC 2011-W06 - 2011 WC - see above
Grabbed MPEC 2011-W07 - 2011 WD - see above
0100Noted that JPL Sentry has posted 2011 VG9 as an impact risk - see above