Contents  on 17 January '08

Resources:

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Radar Astrometry  on 17 January '08

Radar observation of one object

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


Data addition noted at 0600 UTC when the database was dated 16 Jan.

NEOCP Activity  on 17 January '08

The MPC's NEO Confirmation Page has 7 listings: 7 updated

When last checked at 2353 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had seven updated listings. Of these, five were "one nighters." The Tracking News counted a total of nine objects listed on the NEOCP at some point on this day.

New MPECs  on 17 January '08

Minor Planet Electronic Circulars

There were two MPECs issued this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2008-B13 - "17:22 UT" - 2008 BC


<< DOU on 17 Jan. '08 >>  MPEC 2008-B12 - "07:09 UT" - Daily Orbit Update

Observers  on 17 January '08

Thirteen observing facilities appeared in this day's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2005 WJ56
H55Astronomical Research Obs. (ARO) in Illinois, 12 in MPECs 2008-B12 & 2008-B13 -- 2008 BC, 2008 AW28, 2008 AN33, 2008 AM33, 2008 AL33, 2008 AK33, 2008 AJ33, 2007 YH, 2007 VD184, 2003 FH, 2002 JB9, 2002 AE9
J92Beaconsfield Obs. in England, 1 in MPEC 2008-B12 -- 2007 TG8
734Farpoint Obs. in Kansas, 1 in MPEC 2008-B12 -- 2008 AF3
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-B12 -- 3288
J95Great Shefford Obs. in England, 1 in MPEC 2008-B12 -- 2008 AP33
379Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2008-B12 -- 2008 AF4, 2005 XD1, 2005 TU45, 153591
701Junk Bond Obs. in Arizona, 1 in MPEC 2008-B12 -- 2008 AN33
704LINEAR in New Mexico, 3 in MPEC 2008-B12 -- 2008 AK33, 2005 TU45, 11398
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-B12 & 2008-B13 -- 2008 BC, 2008 AU28, 2008 AH4, 2008 AF3, 2008 AD, 2007 YJ1, 2004 BU58, 2003 UY19, 11405
B49Paus Obs. in Spain, 1 in MPEC 2008-B12 -- 2008 AF4
691Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2008-B12 -- 2008 AT28, 2008 AG4, 2006 NM, 2006 KT1, 2006 BA148, 2005 EC224, 2004 HK33, 1999 RQ28, 1998 FX134, 34613, 144411
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2008-B12 -- 2008 AV28, 2008 AF4, 2007 YJ1, 1999 RM45

Impact Risk Monitoring  on 17 January '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2353 and NEODyS at 2354 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090.
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
2008 AN33JPL Sentry15152042-2107229.6e-09-5.11-6.100JPL: "Analysis based on 27 observations spanning 1.0819 days (2008-Jan-15.4591 to 2008-Jan-16.54096)." Diameter approximately 0.554 km. from mean, weighted H=18.9.
NEODyS15152025-2086164.22e-09-5.35-6.100NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2008/01/15.460 to 2008/01/16.542."
2008 AL33JPL Sentry15152015-206771.6e-09-7.12-7.400JPL: "Analysis based on 17 observations spanning 1.1304 days (2008-Jan-15.25594 to 2008-Jan-16.38632)." Diameter approximately 0.089 km. from mean, weighted H=22.9.
NEODyS15152015-2077131.05e-09-7.29-7.350NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/01/15.257 to 2008/01/16.387."
2008 AK33NEODyS15572010-20902751.43e-06-3.02-3.660NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2008/01/15.081 to 2008/01/16.230."
JPL Sentry15152010-21072116.4e-07-3.13-3.680JPL: "Analysis based on 25 observations spanning 1.1490 days (2008-Jan-15.08003 to 2008-Jan-16.22905)." Diameter approximately 0.281 km. from mean, weighted H=20.4.
2008 AG33NEODyS15152016-2090472.12e-07-3.83-5.070NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2008/01/12.510 to 2008/01/16.533."
2008 AF4JPL Sentry17082089-2108472.1e-05-2.30-2.491JPL: "Analysis based on 83 observations spanning 6.6328 days (2008-Jan-10.39652 to 2008-Jan-17.02932)." Diameter approximately 0.412 km. from mean, weighted H=19.6.
NEODyS15572086-209091.41e-05-2.46-2.481NEODyS: "Based on 84 optical observations (of which 1 are rejected as outliers) from 2008/01/10.397 to 2008/01/17.030. NOTE: The Virtual Impactor in 2089/01/09.478 in the table above is rated as Torino Scale 1."

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 January '08

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

1730Grabbed MPEC 2008-B13 - 2008 BC - see above
1708Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above
1557Noted that NEODyS has updated its 2008 AF4 risk assessment - see above
1556Noted that NEODyS has posted 2008 AK33 as an impact risk - see above
1515Noted that NEODyS has posted 2008 AG33 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 AK33 risk assessment - see above
Noted that JPL Sentry has updated its 2008 AL33 risk assessment - see above
Noted that NEODyS has posted 2008 AL33 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 AN33 risk assessment - see above
Noted that NEODyS has posted 2008 AN33 as an impact risk - see above
Grabbed MPEC 2008-B12 - Daily Orbit Update - see above
0600Noted Radar Astrometry database addition