Contents  on 31 December '08

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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 31 December '08

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 0059 UTC when the database was dated 30 Dec.

NEOCP Activity  on 31 December '08

The MPC's NEO Confirmation Page has 9 listings: 9 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine updated listings. Of these, eight were "one nighters." The Tracking News counted a total of 24 objects listed on the NEOCP at some point on this day.

New MPECs  on 31 December '08

Minor Planet Electronic Circulars

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


MPEC 2008-Y86 - "21:51 UT" - 2008 YU30


MPEC 2008-Y85 - "21:46 UT" - 2008 YT30


MPEC 2008-Y84 - "15:17 UT" - 2008 YH30


MPEC 2008-Y83 - "15:14 UT" - 2008 YG30


MPEC 2008-Y82 - "15:12 UT" - 2008 YF30


MPEC 2008-Y81 - "15:08 UT" - 2008 YE30


<< DOU on 31 Dec. '08 >>  MPEC 2008-Y80 - "07:07 UT" - Daily Orbit Update


MPEC 2008-Y79 - "05:23 UT" - Observations of Comets

Observers  on 31 December '08

A total of 59 observing facilities appeared in this day's MPECs.

CodeObserver / observatory
349Ageo Obs. in Japan, 16 in MPEC 2008-Y79 -- P/2008 T4, C/2008 R3, P/2008 QP20, C/2007 S2, C/2006 K1, 207P, 205P, 204P, 147P, 144P, 143P, 136P, 61P, 59P, 51P, 6P
J24Altamira Obs. in Spain, 18 in MPEC 2008-Y79 -- C/2008 T2, C/2008 R3, C/2008 P1, C/2008 N1, C/2008 J1, C/2008 FK75, C/2007 Q3, C/2006 W3, C/2006 U6, C/2006 OF2, 207P, 205P, 144P, 143P, 77P, 68P, 44P, 29P
251Arecibo in Puerto Rico, 2 in radar -- 184266, 4660
H55Astronomical Research Obs. (ARO) in Illinois, 24 in MPEC 2008-Y80 -- 2008 YO27, 2008 YN2, 2008 YM27, 2008 YK2, 2008 YJ3, 2008 YG3, 2008 YG26, 2008 YF3, 2008 YE3, 2008 YD29, 2008 XU2, 2008 XM, 2008 XE2, 2008 WL, 2008 WK96, 2008 VH14, 2008 VG14, 2008 VA15, 2008 SV7, 2008 SH82, 2008 QT3, 2008 EV5, 2003 KU2, 2002 CM1
132Bedoin Obs. in France, 10 in MPEC 2008-Y79 -- P/2008 Q2, P/2008 L2, P/2008 J3, C/2006 K1, 200P, 143P, 77P, 65P, 61P, 44P
B59Borken Obs. in Germany, 3 in MPEC 2008-Y79 -- P/2008 QP20, 204P, 29P
215Buchloe Obs. in Germany, 4 in MPEC 2008-Y79 -- P/2008 X1, P/2008 J3, C/2006 W3, 144P
235CAST Obs. in Italy, 18 in MPECs 2008-Y79 & 2008-Y80 -- 2008 YZ28, P/2008 X1, C/2007 U1, C/2006 W3, C/2006 OF2, 205P, 204P, 200P, 144P, 116P, 74P, 67P, 61P, 59P, 44P, 29P, 19P, 15P
160Castelmartini Obs. in Italy, 4 in MPEC 2008-Y80 -- 89355, 162361, 142348, 136849
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2008-Y79, 2008-Y80, 2008-Y83 & 2008-Y86 -- 2008 YU30, 2008 YR2, 2008 YO27, 2008 YM27, 2008 YG30, 2008 YG26, 2008 WN2, 2008 TK157, 2002 VY94, 55532, 53319, 8567, 5143, 143P
A77Chante-Perdrix Obs. in France, 15 in MPEC 2008-Y79 -- P/2008 T1, C/2008 N1, C/2008 FK75, C/2007 N3, C/2006 OF2, 209P, 207P, 144P, 136P, 77P, 65P, 29P, 22P, 19P, 15P
B60Deep Sky Obs. in Germany, 2 in MPEC 2008-Y80 -- 20460, 3200
448Desert Moon Obs. in New Mexico, 3 in MPEC 2008-Y80 -- 2008 SX245, 2008 RG98, 1998 QE2
113Drebach Obs. in Germany, 2 in MPEC 2008-Y80 -- 2008 SQ1, 2008 SH82
114Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2008-Y85 -- 2008 YT30
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-Y80 -- 2008 YR27
372Geisei Obs. in Japan, 12 in MPEC 2008-Y79 -- P/2008 X1, C/2008 E1, C/2007 N3, C/2006 K1, 205P, 202P, 144P, 68P, 33P, 29P, 22P, 6P
B83Gieres Obs., 4 in MPEC 2008-Y79 -- P/2008 Q2, C/2006 W3, C/2006 OF2, 144P
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 4660
J95Great Shefford Obs. in England, 4 in MPEC 2008-Y80 -- 2008 YR2, 2008 YQ27, 2008 YG29, 2008 YC3
E16Grove Creek Obs. in New South Wales, 1 in MPEC 2008-Y79 -- C/2008 P1
442Gualba Obs. in Spain, 1 in MPEC 2008-Y79 -- 29P
A17Guidestar Obs. in Germany, 3 in MPEC 2008-Y80 -- 2008 YZ28, 2008 YG29, 2008 YF
379Hamamatsu-Yuto Obs. in Japan, 4 in MPECs 2008-Y79 & 2008-Y80 -- 2008 WL60, 2005 BC, 2004 LV3, 67P
B15Inastars Obs. in Germany, 1 in MPEC 2008-Y80 -- 2008 YE29
415Kambah Obs. in the Australian Capital Territory, 3 in MPEC 2008-Y79 -- C/2008 E1, C/2007 Q3, C/2006 K4
682Kanab Obs. in Utah, 1 in MPEC 2008-Y80 -- 2008 YR27
704LINEAR in New Mexico, 30 in MPECs 2008-Y79 & 2008-Y80 -- 2008 YR2, 2008 YN27, 2008 XB1, P/2008 T4, 2008 SQ1, 2008 QT3, P/2008 Q2, 2008 MB5, P/2008 L2, 2005 NJ1, 2001 LM5, 2001 FX9, 96315, 200840, 200754, 189973, 142348, 5143, 4179, 3360, 2368, 1627, 204P, 203P, 202P, 147P, 143P, 117P, 65P, 61P
212La Dehesilla Obs. in Spain, 2 in MPEC 2008-Y79 -- C/2008 J1, 61P
J38La Vara Obs. in Spain, 6 in MPEC 2008-Y79 -- C/2008 A1, C/2006 W3, C/2006 OF2, 67P, 29P, 6P
J59Linceo Obs. in Spain, 2 in MPEC 2008-Y79 -- 144P, 29P
130Lumezzane Obs. in Italy, 2 in MPEC 2008-Y79 -- 203P, 15P
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2008-Y82, 2008-Y83, 2008-Y84, 2008-Y85 & 2008-Y86 -- 2008 YU30, 2008 YT30, 2008 YH30, 2008 YG30, 2008 YF30
J98Manises Obs., 1 in MPEC 2008-Y79 -- C/2006 OF2
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2008-Y80 -- 2008 RT26, 2002 XP90, 2368
J45Montana Cabreja Obs. in the Canary Islands, 1 in MPEC 2008-Y79 -- C/2006 OF2
945Monte Deva Obs. in Spain, 6 in MPEC 2008-Y79 -- C/2008 T2, C/2006 W3, C/2006 OF2, 144P, 59P, 29P
900Moriyama Obs. in Japan, 7 in MPEC 2008-Y79 -- P/2008 X1, C/2008 R3, P/2008 QP20, C/2006 W3, 205P, 144P, 51P
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-Y79, 2008-Y80 & 2008-Y82 -- 2008 YF30, C/2008 S3, 2003 XB22, 2003 RB, 2000 WM107, 1999 AJ39, 85990, 154988, 117P
J47Nazaret Obs. in Spain, 8 in MPEC 2008-Y79 -- P/2008 T1, C/2008 S3, P/2008 Q2, C/2006 W3, 144P, 67P, 29P, 19P
423North Ryde Obs. in New South Wales, 5 in MPEC 2008-Y79 -- C/2008 P1, C/2008 E1, C/2007 Q3, C/2006 U6, C/2006 K4
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 28 in MPECs 2008-Y79 & 2008-Y80 -- 2008 YE3, 2008 XE3, 2008 WQ63, 2008 WL60, 2008 VK14, 2008 UC95, 2008 SQ1, 2008 SH82, P/2008 QP20, P/2008 Q2, 2008 MZ, 2008 EV5, C/2006 OF2, 2005 TZ51, 2005 BC, 2004 LV3, 2002 AU4, 1999 AQ10, 209P, 144P, 74P, 65P, 59P, 51P, 44P, 29P, 19P, 15P
H06RAS Obs. Mayhill in New Mexico, 4 in MPEC 2008-Y79 -- C/2007 N3, C/2006 W3, 144P, 6P
473Remanzacco Obs. in Italy, 1 in MPEC 2008-Y79 -- 29P
461SZTE Asteroid Program in Hungary, 1 in MPEC 2008-Y79 -- C/2008 S3
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2008-Y83 & 2008-Y86 -- 2008 YU30, 2008 YG30
104San Marcello Pistoiese Obs. in Italy, 3 in MPEC 2008-Y80 -- 2008 YZ28, 2008 YR27, 2008 YE29
H36Sandlot Obs. in Kansas, 1 in MPEC 2008-Y79 -- C/2007 S2
204Schiaparelli Obs. in Italy, 3 in MPEC 2008-Y79 -- P/2008 J3, 207P, 33P
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2008-Y80 -- 53430, 199003, 164400, 1943
071Smolyan Obs. in Bulgaria, 11 in MPECs 2008-Y79 & 2008-Y80 -- 2008 WQ63, 2008 WL60, 2008 UC95, 2008 SQ1, C/2007 U1, 2006 WZ2, C/2006 W3, C/2006 OF2, 2005 TZ51, 2005 BC, 2000 FL1
691Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2008-Y79, 2008-Y80, 2008-Y81, 2008-Y84 & 2008-Y85 -- 2008 YT30, 2008 YH30, 2008 YE30, 2003 YL, 204P, 202P, 147P
291Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2008-Y80, 2008-Y81, 2008-Y84 & 2008-Y85 -- 2008 YT30, 2008 YH30, 2008 YF29, 2008 YE30, 2008 YE29, 2008 XA2, 2008 WX32, 2008 WL61, 2008 WJ60, 2008 VH14, 2008 VG14, 2008 SJ82, 2007 DK8, 2005 AY28, 2004 RZ164, 154007, 142348
A97Stammersdorf Obs. in Austria, 2 in MPEC 2008-Y79 -- 144P, 29P
A16Tentlingen Obs. in Switzerland, 1 in MPEC 2008-Y80 -- 4183
H47Vicksburg Obs. in Mississippi, 7 in MPECs 2008-Y79 & 2008-Y80 -- C/2006 W3, 1627, 144P, 116P, 74P, 61P, 29P
A11Wormhout Obs. in France, 4 in MPEC 2008-Y79 -- C/2006 OF2, 144P, 29P, 19P
C42Xingming Obs. in China, 1 in MPEC 2008-Y79 -- 205P
367Yatsuka Obs. in Japan, 1 in MPEC 2008-Y79 -- C/2007 N3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 December '08

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.
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 YH30JPL Sentry17422090-210253.3e-09-9.56-9.950JPL: "Analysis based on 13 observations spanning .17167 days (2008-Dec-31.29293 to 2008-Dec-31.4646)." Diameter approximately 0.014 km. from mean, weighted H=26.8.
2008 YF30JPL Sentry19352019-2108669.1e-08-6.76-7.760JPL: "Analysis based on 12 observations spanning .10763 days (2008-Dec-31.21642 to 2008-Dec-31.32405)." Diameter approximately 0.040 km. from mean, weighted H=24.6.
2008 YF29JPL Sentry14202013-2106271.0e-06-5.32-5.570JPL: "Analysis based on 23 observations spanning .89215 days (2008-Dec-30.24924 to 2008-Dec-31.14139)." Diameter approximately 0.053 km. from mean, weighted H=24.0.
NEODyS14202013-2090362.92e-06-4.66-5.230NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/12/30.250 to 2008/12/31.142."
2008 YE29JPL Sentry14202033-210681.5e-08-5.64-6.200JPL: "Analysis based on 33 observations spanning .90643 days (2008-Dec-30.22562 to 2008-Dec-31.13205)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
NEODyS14202069-208121.44e-09-6.85-6.880NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2008/12/30.226 to 2008/12/31.133."
2008 YA29NEODyS14202027-2079106.72e-09-8.05-8.590NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/12/30.291 to 2008/12/30.412."
2008 YC3JPL Sentry14202070-2108272.0e-04-4.34-4.900JPL: "Analysis based on 26 observations spanning 8.6619 days (2008-Dec-22.25277 to 2008-Dec-30.91466)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
NEODyS14202081-2090116.1e-05-4.83-5.260NEODyS: "Based on 30 optical observations (of which 4 are rejected as outliers) from 2008/12/22.254 to 2008/12/30.915."
2008 XU2JPL Sentry1420203915.1e-07-6.41-6.410JPL: "Analysis based on 37 observations spanning 24.008 days (2008-Dec-06.2616 to 2008-Dec-30.26977)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
NEODyS1420R 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 31 December '08

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

2232Grabbed MPEC 2008-Y85 - 2008 YT30 - see above
Grabbed MPEC 2008-Y86 - 2008 YU30 - see above
1935Noted that JPL Sentry has posted 2008 YF30 as an impact risk - see above
1742Noted that JPL Sentry has posted 2008 YH30 as an impact risk - see above
1600Grabbed MPEC 2008-Y81 - 2008 YE30 - see above
Grabbed MPEC 2008-Y82 - 2008 YF30 - see above
Grabbed MPEC 2008-Y83 - 2008 YG30 - see above
Grabbed MPEC 2008-Y84 - 2008 YH30 - see above
1420Noted that JPL Sentry has updated its 2008 XU2 risk assessment - see above
Noted that NEODyS has removed 2008 XU2 as an impact risk - see above
Noted that NEODyS has posted 2008 YA29 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
Noted that JPL Sentry has updated its 2008 YE29 risk assessment - see above
Noted that NEODyS has posted 2008 YE29 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 YF29 risk assessment - see above
Noted that NEODyS has posted 2008 YF29 as an impact risk - see above
Grabbed MPEC 2008-Y80 - Daily Orbit Update - see above
0558Grabbed MPEC 2008-Y79 - Observations of Comets - see above
0059Noted Radar Astrometry database update - see above