Contents  on 9 October '11


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 9 October '11

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There were four listings noted earlier today.

New MPECs  on 9 October '11

Minor Planet Electronic Circulars

As of last check at 2246 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-T43 - "20:08 UT" - 2011 TX8

MPEC 2011-T42 - "20:07 UT" - 2011 SE248

MPEC 2011-T41 - "19:02 UT" - 2011 GH3

<< DOU on 9 Oct. '11 >>  MPEC 2011-T40 - "06:04 UT" - Daily Orbit Update

Observers  on 9 October '11

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 30 in MPECs 2011-T40, 2011-T41, 2011-T42 & 2011-T43 -- 2011 TX8, 2011 TQ8, 2011 TK, 2011 TG2, 2011 TB4, 2011 SZ21, 2011 SU232, 2011 SS25, 2011 SR69, 2011 SQ25, 2011 SQ12, 2011 SO32, 2011 SO25, 2011 SJ68, 2011 SJ16, 2011 SF25, 2011 SE97, 2011 SE248, 2011 RR12, 2011 RJ1, 2011 RF, 2011 QE38, 2011 OV4, 2011 HC36, 2011 GH3, 2009 QF31, 2006 SQ78, 2005 NX44, 2003 HA22, 2000 SP43
160Castelmartini Obs. in Italy, 3 in MPEC 2011-T40 -- 2011 SQ12, 2011 PT1, 2011 OQ5
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2011-T43 -- 2011 TX8
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2011-T42 -- 2011 SE248
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-T42 -- 2011 SE248
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2011-T40 -- 1917
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2011-T40 -- 2000 SP43, 138524, 1036
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2011-T42 & 2011-T43 -- 2011 TX8, 2011 SE248
A24New Millennium Obs. in Italy, 1 in MPEC 2011-T40 -- 2004 SV55
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-T42 -- 2011 SE248
D29Purple Mtn. Obs. Xuyi Station in China, 1 in MPEC 2011-T40 -- 137799
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-T43 -- 2011 TX8
H36Sandlot Obs. in Kansas, 2 in MPECs 2011-T40 & 2011-T42 -- 2011 TQ8, 2011 SE248
C75Whitestar Obs., 2 in MPECs 2011-T42 & 2011-T43 -- 2011 TX8, 2011 SE248
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 9 October '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2236 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.





Notes for Today's Latest Risk Assessments
2011 TQ8JPL Sentry1602R E M O V E DJPL: Risk listing removed at 0851 UTC.
2011 TKJPL Sentry1602210012.1e-08-6.01-6.010JPL: "Analysis based on 51 observations spanning 6.8473 days (2011-Oct-01.34764 to 2011-Oct-08.194951)." Diameter approximately 0.190 km. from mean, weighted H=21.2.
NEODyS1602R E M O V E D-
2011 SE97JPL Sentry1602209515.2e-08-7.20-7.200JPL: "Analysis based on 71 observations spanning 11.921 days (2011-Sep-26.35341 to 2011-Oct-08.274297)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

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 9 October '11

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

2217Grabbed MPEC 2011-T41 - 2011 GH3 - see above
Grabbed MPEC 2011-T42 - 2011 SE248 - see above
Grabbed MPEC 2011-T43 - 2011 TX8 - see above
Noted that the NEOCP has become empty
1602Noted that JPL Sentry has updated its 2011 SE97 risk assessment - see above
Noted that JPL Sentry has updated its 2011 TK risk assessment - see above
Noted that NEODyS has removed 2011 TK as an impact risk - see above
Noted that JPL Sentry has removed 2011 TQ8 as an impact risk - see above
Grabbed MPEC 2011-T40 - Daily Orbit Update - see above