Contents  on 16 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 16 October '11

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 0430 UTC when the database was dated 15 Oct.

NEOCP Activity  on 16 October '11

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2301 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, three were "one nighters."

New MPECs  on 16 October '11

Minor Planet Electronic Circulars

As of last check at 2301 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-U02 - "20:50 UT" - Comet P/2011 R2 = 1998 RS22 (Panstarrs)


<< DOU on 16 Oct. '11 >>  MPEC 2011-U01 - "06:02 UT" - Daily Orbit Update

Observers  on 16 October '11

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 2011 SE97, 2002 KK8
H21Astronomical Research Obs. Westfield in Illinois, 22 in MPEC 2011-U01 -- 2011 TX8, 2011 TP6, 2011 TK, 2011 TJ, 2011 TG2, 2011 TC4, 2011 TA4, 2011 SU68, 2011 SR25, 2011 SQ12, 2011 SP68, 2011 SM68, 2011 SJ16, 2011 QY37, 2011 QF14, 2011 QD48, 2011 PT1, 2011 OV4, 2011 LJ19, 2009 HV2, 2006 HX5, 2001 GR2
703Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2011-U01 -- 2011 OQ5, 32906, 283460, 143678, 8507, 5653
821Cordoba-Bosque Alegre Obs., 2 in MPEC 2011-U01 -- 2011 TJ, 2001 GR2
958Dax Obs. in France, 1 in MPEC 2011-U02 -- P/2011 R2
448Desert Moon Obs. in New Mexico, 14 in MPEC 2011-U01 -- 2011 TJ, 2011 TG2, 2011 TC4, 2011 TA4, 2011 SU68, 2011 SR25, 2011 SM68, 2011 SJ68, 2011 SE248, 2011 SD191, 2011 RR12, 2011 QY37, 2011 QD48, 24475
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2011-U01 -- 2011 TN9
I19El Gato Gris Obs. in Argentina, 4 in MPEC 2011-U01 -- 2011 TG2, 2011 SR25, 2011 SF3, 2009 HV2
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-U01 -- 2011 TN9
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-U01 -- 1917
J95Great Shefford Obs. in England, 1 in MPEC 2011-U01 -- 2011 TN9
A17Guidestar Obs. in Germany, 1 in MPEC 2011-U01 -- 2011 TG2
246KLENOT in the Czech Republic, 2 in MPEC 2011-U01 -- 2011 TN9, 2011 TG2
046Klet Obs. in the Czech Republic, 3 in MPEC 2011-U01 -- 2011 TN9, 2011 TG2, 2011 TA4
704LINEAR in New Mexico, 1 in MPEC 2011-U02 -- P/1998 RS22
B82Maidbronn Obs. in Germany, 1 in MPEC 2011-U01 -- 2011 TN9
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-U01 -- 2011 EF17
932McCarthy Obs. in Connecticut, 1 in MPEC 2011-U01 -- 2011 TN9
213Montcabre Obs. in Spain, 1 in MPEC 2011-U02 -- P/2011 R2
J69North Obs. in England, 1 in MPEC 2011-U01 -- 138524
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2011-U01 -- 2011 SF3, 2005 CJ
204Schiaparelli Obs. in Italy, 7 in MPEC 2011-U01 -- 2011 TP, 2011 SR69, 2011 SK189, 2005 NX44, 2004 QV16, 2001 GR2, 2000 SH8
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2011-U02 -- P/2011 R2
291Spacewatch 1.8m telescope in Arizona, 6 in MPEC 2011-U01 -- 2011 TX8, 2011 TA4, 2011 SU68, 2011 SG16, 2011 SE108, 2011 SB16
A71Stixendorf Obs. in Austria, 1 in MPEC 2011-U02 -- P/2011 R2
A48Verona Obs. in Italy, 2 in MPEC 2011-U01 -- 2011 TA4, 2011 SQ12
H47Vicksburg Obs. in Mississippi, 4 in MPEC 2011-U01 -- 87311, 3352, 1627, 1620
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 October '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2301 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 TKJPL Sentry1450210012.1e-09-7.04-7.040JPL: "Analysis based on 65 observations spanning 13.855 days (2011-Oct-01.34764 to 2011-Oct-15.202613)." Diameter approximately 0.190 km. from mean, weighted H=21.3.
2011 SE97JPL Sentry0533R E M O V E DJPL: Risk listing removed at 0451 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 16 October '11

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

2214Grabbed MPEC 2011-U02 - Comet P/2011 R2 = 1998 RS22 (Panstarrs) - see above
1450Noted that JPL Sentry has reposted 2011 TK as an impact risk - see above
Grabbed MPEC 2011-U01 - Daily Orbit Update - see above
0533Noted that JPL Sentry has removed 2011 SE97 as an impact risk - see above
0430Noted Radar Astrometry database update - see above