Contents  on 11 October '09

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 11 October '09

The MPC's NEO Confirmation Page has 1 listing: 1 new

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new listing. This was a "one nighter." So far The Tracking News has counted a total of five listings on the NEOCP at some point 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 11 October '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-T37 - "23:17 UT" - 2009 TA1


MPEC 2009-T36 - "14:21 UT" - Comet C/2009 T1 (McNaught)


<< DOU on 11 Oct. '09 >>  MPEC 2009-T35 - "06:08 UT" - Daily Orbit Update

Observers  on 11 October '09

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. in Illinois, 1 in MPEC 2009-T37 -- 2009 TA1
I77CEAMIG-REA in Brazil, 1 in MPEC 2009-T36 -- C/2009 T1
703Catalina Sky Survey in Arizona, 1 in MPEC 2009-T35 -- 5626
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-T35 -- 2009 TU
J95Great Shefford Obs. in England, 2 in MPECs 2009-T35 & 2009-T37 -- 2009 TA1, 2009 SX1
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2009-T35 -- 2009 ST19, 2009 RN, 2009 KC3, 2005 RQ6, 2000 CO101, 3200
J28Jaen Obs. in Spain, 1 in MPEC 2009-T37 -- 2009 TA1
704LINEAR in New Mexico, 1 in MPEC 2009-T35 -- 2009 TK
J75La Sagra Obs. in Spain, 1 in MPEC 2009-T37 -- 2009 TA1
474Mt. John Obs. in New Zealand, 6 in MPECs 2009-T35, 2009-T36 & 2009-T37 -- 2009 TK, 2009 TJ, 2009 TA1, C/2009 T1, 2009 SK1, 2009 SD229
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2009-T35 & 2009-T37 -- 2009 TA1, 2009 QZ6
204Schiaparelli Obs. in Italy, 1 in MPEC 2009-T37 -- 2009 TA1
E12Siding Spring Survey in New South Wales, 1 in MPEC 2009-T36 -- C/2009 T1
587Sormano Obs. in Italy, 2 in MPEC 2009-T35 -- 2009 TS, 2009 TQ
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2009-T35 -- 2009 SM98
926Tenagra II Obs. in Arizona, 5 in MPECs 2009-T35 & 2009-T37 -- 2009 TS, 2009 TA1, 2009 SV171, 2009 SL104, 2009 SK2
D25Tzec Maun Obs. Pingelly in Western Australia, 1 in MPEC 2009-T36 -- C/2009 T1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 October '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON (backup) 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
2009 TUJPL Sentry16512079-2107137.5e-06-6.29-6.860JPL: "Analysis based on 23 observations spanning .26881 days (2009-Oct-10.18978 to 2009-Oct-10.45859)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
NEODyS16512079-208665.71e-06-6.38-6.860NEODyS: "Based on 24 optical observations (of which 1 are rejected as outliers) from 2009/10/10.191 to 2009/10/10.459."
2009 TTNEODyS16512078-208943.24e-08-7.67-8.050NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2009/10/10.167 to 2009/10/10.386."
2009 SM98NEODyS1651R E M O V E D-
JPL Sentry1651R E M O V E DJPL: Risk listing removed at 0850 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 11 October '09

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

2358Grabbed MPEC 2009-T37 - 2009 TA1 - see above
1651Noted that JPL Sentry has removed 2009 SM98 as an impact risk - see above
Noted that NEODyS has removed 2009 SM98 as an impact risk - see above
Noted that NEODyS has posted 2009 TT as an impact risk - see above
Noted that JPL Sentry has updated its 2009 TU risk assessment - see above
Noted that NEODyS has posted 2009 TU as an impact risk - see above
Grabbed MPEC 2009-T35 - Daily Orbit Update - see above
Grabbed MPEC 2009-T36 - Comet C/2009 T1 (McNaught) - see above