Contents  on 30 December '08

Resources:

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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 30 December '08

Radar observation of three 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 2210 UTC when the database was dated 30 Dec.

NEOCP Activity  on 30 December '08

The MPC's NEO Confirmation Page has 2 listings: 1 new, 1 updated

When last checked at 2259 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and one updated listing. Both of these were "one nighters." The Tracking News counted a total of fifteen objects listed on the NEOCP at some point on this day.

New MPECs  on 30 December '08

Minor Planet Electronic Circulars

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


MPEC 2008-Y78 - "21:44 UT" - 2008 YD29


MPEC 2008-Y77 - "21:04 UT" - 2008 YG29


MPEC 2008-Y76 - "21:00 UT" - 2008 YF29


MPEC 2008-Y75 - "20:57 UT" - 2008 YE29


MPEC 2008-Y74 - "19:57 UT" - 2004 XA192, 2006 UO321


MPEC 2008-Y73 - "19:12 UT" - 2008 YC29


MPEC 2008-Y72 - "19:08 UT" - 2008 YB29


MPEC 2008-Y71 - "19:06 UT" - 2008 YA29


MPEC 2008-Y70 - "17:44 UT" - 2008 YZ28


MPEC 2008-Y69 - "15:09 UT" - 2008 YS27


MPEC 2008-Y68 - "15:06 UT" - 2008 YR27


MPEC 2008-Y67 - "15:03 UT" - 2008 YQ27


<< DOU on 30 Dec. '08 >>  MPEC 2008-Y66 - "07:07 UT" - Daily Orbit Update


MPEC 2008-Y65 - "00:16 UT" - 2008 YO27


MPEC 2008-Y64 - "00:13 UT" - 2008 YN27

Observers  on 30 December '08

A total of 32 observing facilities appeared in this day's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 3 in radar -- 2008 UE7, 2004 XL14, 2004 LV3
H55Astronomical Research Obs. (ARO) in Illinois, 18 in MPECs 2008-Y66 & 2008-Y68 -- 2008 YR27, 2008 YN2, 2008 YM2, 2008 YJ3, 2008 YG3, 2008 YC3, 2008 XB1, 2008 WZ94, 2008 WH60, 2008 WD14, 2008 UW5, 2008 TF4, 2008 SJ82, 2008 SH82, 2008 SE, 2008 SC85, 2008 MN1, 2000 QJ130
703Catalina Sky Survey (CSS) in Arizona, 16 in MPECs 2008-Y66, 2008-Y69, 2008-Y72, 2008-Y73, 2008-Y75 & 2008-Y76 -- 2008 YS27, 2008 YF29, 2008 YE29, 2008 YC29, 2008 YB29, 2008 TN166, 2007 YZ, 2005 NJ1, 2003 YO1, 2001 FX9, 2000 OM, 22099, 16834, 14402, 1627, 1221
807Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2008-Y74 -- 2006 UO321
B60Deep Sky Obs. in Germany, 2 in MPEC 2008-Y66 -- 85236, 3200
448Desert Moon Obs. in New Mexico, 4 in MPEC 2008-Y66 -- 2008 XN, 2004 KT, 2003 YX1, 2000 EW70
113Drebach Obs. in Germany, 2 in MPECs 2008-Y70 & 2008-Y75 -- 2008 YZ28, 2008 YE29
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2008-Y66 & 2008-Y76 -- 2008 YG26, 2008 YF29
B23Fiamene Obs. in Italy, 4 in MPEC 2008-Y66 -- 2008 SQ1, 2008 RT26, 2008 MZ, 2005 TZ51
J95Great Shefford Obs. in England, 7 in MPECs 2008-Y64, 2008-Y65, 2008-Y66, 2008-Y68, 2008-Y69 & 2008-Y78 -- 2008 YS27, 2008 YR27, 2008 YO27, 2008 YN27, 2008 YG26, 2008 YD29, 2008 XQ2
A17Guidestar Obs. in Germany, 2 in MPECs 2008-Y68 & 2008-Y75 -- 2008 YR27, 2008 YE29
379Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2008-Y66 -- 2008 YK2, 2008 WQ63, 2008 WL60, 2008 SH82, 2005 BC, 2004 LV3
A35Hormersdorf Obs. in Germany, 1 in MPEC 2008-Y66 -- 2008 YK2
695Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2008-Y74 -- 2006 UO321, 2004 XA192
704LINEAR in New Mexico, 19 in MPECs 2008-Y64, 2008-Y65, 2008-Y66 & 2008-Y67 -- 2008 YQ27, 2008 YO27, 2008 YN27, 2008 XV2, 2007 YZ, 2003 XB22, 89355, 199801, 194386, 19356, 163014, 162361, 153814, 136849, 7358, 6569, 4183, 3360, 3122
560Madonna di Dossobuono Obs. in Italy, 4 in MPEC 2008-Y66 -- 2008 WL60, 2008 VK14, 2008 SQ1, 2008 SH82
H01Magdalena Ridge Obs. (MRO) in New Mexico, 13 in MPECs 2008-Y66, 2008-Y67, 2008-Y68, 2008-Y69, 2008-Y70, 2008-Y71, 2008-Y72, 2008-Y73, 2008-Y75, 2008-Y76, 2008-Y77 & 2008-Y78 -- 2008 YZ28, 2008 YS27, 2008 YR27, 2008 YQ27, 2008 YG29, 2008 YF29, 2008 YE29, 2008 YD29, 2008 YC29, 2008 YB29, 2008 YA29, 2008 XU2, 2008 WY94
B79Marana Obs., 2 in MPEC 2008-Y66 -- 2008 UE7, 137805
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2008-Y66 -- 141052
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-Y66, 2008-Y68, 2008-Y69, 2008-Y70, 2008-Y71 & 2008-Y77 -- 2008 YZ28, 2008 YS27, 2008 YR27, 2008 YG29, 2008 YA29, 2008 XB1, 2008 TN166, 99935
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2008-Y74 -- 2004 XA192
A13Naef Obs. in Switzerland, 2 in MPECs 2008-Y66 & 2008-Y68 -- 2008 YR27, 2007 UY1
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2008-Y66 -- 2008 YE3, 2008 XE2, 2008 WQ63, 2008 VU4, 2008 VK14, 2008 UC95, 2008 SQ1, 2008 SH82, 2008 EV5, 2005 BC
H06%E. Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-Y75 -- 2008 YE29
473Remanzacco Obs. in Italy, 1 in MPEC 2008-Y67 -- 2008 YQ27
854Sabino Canyon Obs. in Arizona, 9 in MPECs 2008-Y67, 2008-Y68, 2008-Y69, 2008-Y70, 2008-Y72, 2008-Y73, 2008-Y75, 2008-Y76 & 2008-Y77 -- 2008 YZ28, 2008 YS27, 2008 YR27, 2008 YQ27, 2008 YG29, 2008 YF29, 2008 YE29, 2008 YC29, 2008 YB29
H36Sandlot Obs. in Kansas, 3 in MPECs 2008-Y67, 2008-Y68 & 2008-Y78 -- 2008 YR27, 2008 YQ27, 2008 YD29
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2008-Y66 -- 2006 SZ217, 6053
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2008-Y66 & 2008-Y78 -- 2008 YD29, 96315, 186844, 18106, 159923, 153814, 153220, 3102, 2368
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2008-Y66, 2008-Y68, 2008-Y71 & 2008-Y78 -- 2008 YR27, 2008 YP2, 2008 YJ3, 2008 YD29, 2008 YA29, 2008 XO2, 2008 XM, 2008 WZ94, 2008 WZ13, 2008 WM64, 2005 VO5, 2003 YX1, 142348
611Starkenburg Obs. in Germany, 2 in MPECs 2008-Y75 & 2008-Y76 -- 2008 YF29, 2008 YE29
H53Thompsonville Obs. in Illinois, 6 in MPEC 2008-Y66 -- 2004 LV3, 194386, 162900, 8567, 4179, 1627
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 December '08

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2259 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.
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 YF29JPL Sentry00012013-21081632.0e-06-5.06-5.870"Analysis based on 21 observations spanning .56969 days (2008-Dec-30.24924 to 2008-Dec-30.81893)." Diameter approximately 0.054 km. from mean, weighted H=24.0.
2008 YE29JPL Sentry00012014-21081291.7e-07-4.15-5.140"Analysis based on 23 observations spanning .62659 days (2008-Dec-30.22562 to 2008-Dec-30.85221)." Diameter approximately 0.340 km. from mean, weighted H=20.0.
2008 YB29JPL Sentry22102021-210191.0e-06-6.55-6.860JPL: "Analysis based on 19 observations spanning .16832 days (2008-Dec-30.38794 to 2008-Dec-30.55626)." Diameter approximately 0.025 km. from mean, weighted H=25.7.
2008 YA29JPL Sentry22102027-2106191.8e-08-7.63-8.430JPL: "Analysis based on 16 observations spanning .12116 days (2008-Dec-30.29053 to 2008-Dec-30.41169)." Diameter approximately 0.040 km. from mean, weighted H=24.7.
2008 YC3JPL Sentry15292070-2107262.0e-04-4.34-4.900JPL: "Analysis based on 24 observations spanning 6.8814 days (2008-Dec-22.25277 to 2008-Dec-29.13413)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS15292085-2090126.32e-05-4.80-5.260NEODyS: "Based on 28 optical observations (of which 4 are rejected as outliers) from 2008/12/22.254 to 2008/12/29.135."
2008 XU2JPL Sentry1529203913.5e-07-6.57-6.570JPL: "Analysis based on 34 observations spanning 22.945 days (2008-Dec-06.2616 to 2008-Dec-29.20676)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
NEODyS1529203913.38e-07-6.58-6.580NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2008/12/06.262 to 2008/12/29.208."
2008 WY94JPL Sentry1529R E M O V E DJPL: Risk listing removed at 0951 UTC.
NEODyS1529R 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 30 December '08

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

2359Noted that JPL Sentry has posted 2008 YE29 as an impact risk - see above
Noted that JPL Sentry has posted 2008 YF29 as an impact risk - see above
2211Grabbed MPEC 2008-Y74 - 2004 XA192, 2006 UO321 - see above
Grabbed MPEC 2008-Y75 - 2008 YE29 - see above
Grabbed MPEC 2008-Y76 - 2008 YF29 - see above
Grabbed MPEC 2008-Y77 - 2008 YG29 - see above
Grabbed MPEC 2008-Y78 - 2008 YD29 - see above
2210Noted that JPL Sentry has posted 2008 YA29 as an impact risk - see above
Noted that JPL Sentry has posted 2008 YB29 as an impact risk - see above
Noted Radar Astrometry database update - see above
1959Grabbed MPEC 2008-Y71 - 2008 YA29 - see above
Grabbed MPEC 2008-Y72 - 2008 YB29 - see above
Grabbed MPEC 2008-Y73 - 2008 YC29 - see above
1759Grabbed MPEC 2008-Y70 - 2008 YZ28 - see above
1529Noted that JPL Sentry has removed 2008 WY94 as an impact risk - see above
Noted that NEODyS has removed 2008 WY94 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 XU2 risk assessment - see above
Noted that NEODyS has reposted 2008 XU2 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 YC3 risk assessment - see above
Noted that NEODyS has updated its 2008 YC3 risk assessment - see above
Grabbed MPEC 2008-Y66 - Daily Orbit Update - see above
Grabbed MPEC 2008-Y67 - 2008 YQ27 - see above
Grabbed MPEC 2008-Y68 - 2008 YR27 - see above
Grabbed MPEC 2008-Y69 - 2008 YS27 - see above
0028Grabbed MPEC 2008-Y64 - 2008 YN27 - see above
Grabbed MPEC 2008-Y65 - 2008 YO27 - see above