2008-12-24 Tracking News

Contents on 24 December '08

IAU Minor Planet Center
- NEOCP Activity -- two listings: 2 updated
- New MPECs -- two MPECs
Observers -- 37 observing facilities
Impact Risk Monitoring -- four objects
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Earth's Busy Neighborhood Traffic Report
Ephemerides for risk-rated and nearby objects
Old & new CRT Archive
Old News Archive & Small Objects Archive

The latest A/CC news is available via framed access, 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 24 December '08

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

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had two updated listings. Of these, one was a "one nighter." So far The Tracking News has counted a total of three objects listed on the NEOCP at some point today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object by Birtwhistle et al. at Suno Observatory.

New MPECs on 24 December '08

Minor Planet Electronic Circulars

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

MPEC 2008-Y49 time-stamped "04:01 UT" - 2008 JY30 - see below
MPEC 2008-Y50 time-stamped "07:06 UT" - Daily Orbit Update

<< DOU on 24 Dec. '08 >> MPEC 2008-Y50 - "07:06 UT" - Daily Orbit Update

Observations of risk-listed objects
K08X02U 2008 XU2 from the Spacewatch 1.8m telescope (Dec. 22.53-54p2)
K08X02O 2008 XO2 from Spacewatch 1.8m (Dec. 21.25-26p3 at V=21.9-22.1 & 22.18-19p3 at V=21.4-22.2)
K08W96K 2008 WK96 from Magdalena Ridge Obs. (MRO) (Dec. 21.52-53p3) and Spacewatch 1.8m (Dec. 22.51-52p3)
Observations of recently (no longer) risk-listed objects
K08X02P 2008 XP2 from Desert Moon Obs. (Dec. 21.54p1)
K08X00N 2008 XN from Spacewatch 1.8m (Dec. 22.24-25p3) and Desert Moon Obs. (Dec. 22.30-36p3)
K08W96J 2008 WJ96 from Spacewatch 1.8m (Dec. 22.45-46p3)
K08W64M 2008 WM64 from Spacewatch 1.8m (Dec. 21.53-54p3 & 22.43-44p3)
K08W63Q 2008 WQ63 (arc=32 days, H=20.1 ~323m) from LINEAR (Dec. 20.33-38p5), the Catalina Sky Survey (CSS) (Dec. 20.34-36p4), Hamamatsu-Yuto Obs. (Dec. 20.70-73p6 & 22.77-81p9), El Guijo Obs. (Dec. 21.11-13p3), Petit Jean Mtn. South Obs. (PJMSO) (Dec. 21.36p6), Peschiera del Garda Obs. (Dec. 21.97-99p4), and Mirasteilas Obs. (Dec. 24.02-03p3)
K08W32K 2008 WK32 from Spacewatch 1.8m (Dec. 21.23-24p3)
K08W13Z 2008 WZ13 from Spacewatch 1.8m (Dec. 21.22-23p3 & 22.20p3)
Observations of other objects
K08Y02Q 2008 YQ2 from the Siding Spring Survey (SSS) (Dec. 22.74p2)
K08Y02P 2008 YP2 from Sormano Obs. (Dec. 21.94-96p4)
K08Y02L 2008 YL2 from Naef Obs. (Dec. 22.77p3)
K08Y00F 2008 YF from LINEAR (Dec. 20.45-50p4 & 21.44-49p5) and Sormano Obs. (Dec. 22.00p3)
K08Y00A 2008 YA (Q=4.795 AU, arc=7 days, H=17.8 ~933m) from Mt. John Obs. (Dec. 23.49p3)
K08X03E 2008 XE3 (Q=4.045 AU, arc=2 opp, H=16.2 ~1.95 km) from Mirasteilas Obs. (Dec. 23.98-99p3)
K08X02V 2008 XV2 from Desert Moon Obs. (Dec. 21.38-40p3)
K08X02E 2008 XE2 from Stia Obs. (Dec. 21.84-87p3) and Crni Vrh Obs. (Dec. 21.00-03p4)
K08X01L 2008 XL1 from Spacewatch 1.8m (Dec. 21.35-36p3)
K08X01K 2008 XK1 from Spacewatch 1.8m (Dec. 21.33-34p3 & 22.27p3)
K08X01B 2008 XB1 from Madonna di Dossobuono Obs. (Dec. 21.76-77p3)
K08X00M 2008 XM from Spacewatch 1.8m (Dec. 22.12-13p3)
K08W94Z 2008 WZ94 (q=0.344 AU, arc=21 days, H=20.1 ~323m) from Linz Obs. (Dec. 3.00-01p4), CSS (Dec. 20.28p3), the Mt. Lemmon Survey (MLS) (Dec. 21.17-18p4), and Spacewatch 1.8m (Dec. 21.21-22p3)
K08W60L 2008 WL60 from Mataro Obs. (Dec. 19.97p3), Hamamatsu-Yuto Obs. (Dec. 20.60-64p6 & 22.68-71p9), and PJMSO (Dec. 21.31-32p6)
K08W60J 2008 WJ60 from Spacewatch 1.8m (Dec. 22.42p3)
K08W60H 2008 WH60 from MLS (Dec. 21.19-21p4) and Desert Moon Obs. (Dec. 21.20-24p3)
K08W14F 2008 WF14 from Spacewatch 1.8m (Dec. 21.30-32p3 at V=22.8-23)
K08W02N 2008 WN2 from Desert Moon Obs. (Dec. 21.26-28p4), Spacewatch 1.8m (Dec. 22.16-17p3), and CSS (Dec. 22.25-27p4)
K08V15A 2008 VA15 from Spacewatch 1.8m (Dec. 21.52p3 at V=20.7-22.1)
K08V14K 2008 VK14 from Stia Obs. (Dec. 21.77p2)
K08V14G 2008 VG14 (Q=4.380 AU, arc=44 days, H=20.3 ~295m) from MLS (Dec. 21.29-30p4)
K08U95C 2008 UC95 from LINEAR (Dec. 21.39-44p5) and Desert Moon Obs. (Dec. 21.50-51p5)
K08U01U 2008 UU1 from Spacewatch 1.8m (Dec. 22.14p1)
K08U00C 2008 UC from Stia Obs. (Dec. 21.73-74p3)
K08TF7K 2008 TK157 from CSS (Dec. 22.25-27p4)
K08TF7E 2008 TE157 from Desert Moon Obs. (Dec. 22.18-24p3)
K08T27D 2008 TD27 from Desert Moon Obs. (Dec. 22.08-14p3)
K08S82H 2008 SH82 from Lumezzane Obs. (Dec. 19.76-77p3), Stia Obs. (Dec. 20.73-75p4), CSS (Dec. 21.21-23p4), Madonna di Dossobuono Obs. (Dec. 21.75p3), and LINEAR (Dec. 22.14-19p5)
K08S07X 2008 SX7 from Spacewatch 1.8m (Dec. 21.16-17p3)
K08S01Q 2008 SQ1 from Hamamatsu-Yuto Obs. (Dec. 19.44-48p5, 20.48-52p7, 22.52-54p4 & 22.58p1), Atlante Obs. (Dec. 20.93p3 & 21.91-92p3), PJMSO (Dec. 21.27-28p6), Peschiera del Garda Obs. (Dec. 21.82-87p4), and Fiamene Obs. (Dec. 21.84-85p4)
K08Q03T 2008 QT3 from Madonna di Dossobuono Obs. (Dec. 21.72-73p3) and CSS (Dec. 22.13-14p4)
K08M00Z 2008 MZ from Marana Obs. (Dec. 8.87p4) and Stia Obs. (Dec. 20.76-77p3)
K08E05V 2008 EV5 (arc=2 opp, H=20.2 ~309m) from PJMSO (Dec. 21.35p8), Peschiera del Garda Obs. (Dec. 22.01p5), Schiaparelli Obs. (Dec. 22.04-06p3), Atlante Obs. (Dec. 22.04-05p3), and Mirasteilas Obs. (Dec. 23.95-01p6)
K08E00E 2008 EE from David Tholen's team on Mauna Kea (Nov. 21.61p4)
K07V08L 2007 VL8 from Tholen et al. (Nov. 21.55p3)
K07M13K 2007 MK13 from LINEAR (Dec. 22.47-50p4)
K06W02Y 2006 WY2 from SSS (Dec. 20.46-49p3)
K06SL7Z 2006 SZ217 from SSS (Dec. 20.59-62p4)
K06SD1U 2006 SU131 from Spacewatch 1.8m (Dec. 22.11p2)
K06O05B 2006 OB5 from MLS (Dec. 22.28-30p4)
K06B10C 2006 BC10 from Spacewatch 1.8m (Dec. 22.36p3)
K05Y00S 2005 YS from Madonna di Dossobuono Obs. (Dec. 21.74p3)
K05X04M 2005 XM4 from Lumezzane Obs. (Dec. 19.94-95p4), CSS (Dec. 20.23-26p3), MLS (Dec. 21.22-23p4), and LINEAR (Dec. 22.20-23p4)
K05W55S 2005 WS55 from El Guijo Obs. (Dec. 21.82-86p2)
K05V17Y 2005 VY17 from MLS (Dec. 21.53-54p4)
K05T51Z 2005 TZ51 from Hamamatsu-Yuto Obs. (Dec. 19.49-51p4 & 20.52-55p4) and PJMSO (Dec. 21.24p5)
K05S71B 2005 SB71 from Spacewatch 1.8m (Dec. 22.32p3)
K05S25N 2005 SN25 from Desert Moon Obs. (Dec. 21.32-35p3) and Spacewatch 1.8m (Dec. 21.37p3 & 22.28-29p3)
K05C25V 2005 CV25 from Tholen et al. (Nov. 20.20p3)
K05B00C 2005 BC (arc=2 opp, H=17.9 ~891m) from Schiaparelli Obs. (Dec. 22.12-13p5)
K05A28Y 2005 AY28 from Spacewatch 1.8m (Dec. 21.38-39p3 & 22.29-30p3)
K03Y01O 2003 YO1 from CSS (Dec. 22.35-36p3)
K03Y00L 2003 YL from MLS (Dec. 22.39-40p4)
K03U34X 2003 UX34 from CSS (Dec. 22.53-55p4)
K03Q47M 2003 QM47 (arc=4 opp, H=18.2 ~776m) from Mt. John Obs. (Dec. 23.53-54p3)
K02V94Y 2002 VY94 from Lumezzane Obs. (Dec. 19.81-82p4) and PJMSO (Dec. 21.26-27p5)
K02E06L 2002 EL6 from Spacewatch 1.8m (Dec. 22.44-45p3 at V=22.2)
K02A05C 2002 AC5 from Spacewatch 1.8m (Dec. 21.07-08p3)
K01W01T 2001 WT1 from Desert Moon Obs. (Dec. 21.43-47p3)
K01V05K 2001 VK5 from CSS (Dec. 21.11-13p4)
K01QE3A 2001 QA143 from Spacewatch 1.8m (Dec. 22.47-48p2)
K01O84E 2001 OE84 (arc=3 opp, H=17.9 ~891m) from CSS (Dec. 22.40-42p4)
K00F01L 2000 FL1 from Hamamatsu-Yuto Obs. (Dec. 19.83-86p3 & 22.82-86p5)
K00A93Z 2000 AZ93 from Spacewatch 1.8m (Dec. 22.08-09p3)
J94A01W 1994 AW1 from El Guijo Obs. (Dec. 21.79p2), LINEAR (Dec. 22.07-12p4), and San Vito Obs. (Dec. 22.71-72p3)
J93V00D 1993 VD from Spacewatch 1.8m (Dec. 21.45-46p3 & 22.40-41p3)
K2435 202435 2005 XH8 from LINEAR (Dec. 20.32-37p5)
K0840 200840 2001 XN254 from Stia Obs. (Dec. 20.80-81p4) and MLS (Dec. 22.24-25p4)
K0754 200754 2001 WA25 from El Guijo Obs. (Dec. 20.99-02p3)
J9801 199801 2007 AE12 from Marana Obs. (Dec. 8.88p5) and LINEAR (Dec. 21.25-30p5)
J8752 198752 2005 EA60 from LINEAR (Dec. 22.39-43p3)
J4386 194386 2001 VG5 from Marana Obs. (Dec. 7.90-91p5) and CSS (Dec. 20.23-26p4)
I9973 189973 2003 XE11 from CSS (Dec. 22.09-11p3)
I9058 189058 2000 UT16 from LINEAR (Dec. 22.07-11p3)
H5114 175114 2004 QQ from MLS (Dec. 22.36-38p4 at V=21.4-22.7)
G2900 162900 2001 HG31 from Cormons Obs. (Dec. 20.75-76p3) and Mataro Obs. (Dec. 21.79-81p3)
F9923 159923 2004 YJ32 from the Spacewatch 0.9m telescope (Dec. 21.52-55p3)
F9368 159368 1979 QB from Spacewatch 0.9m (Dec. 21.51-55p3)
F3220 153220 2000 YN29 from MLS (Dec. 22.24-25p4)
F2931 152931 2000 EA107 from LINEAR (Dec. 21.44-48p5)
E3651 143651 2003 QO104 from LINEAR (Dec. 20.41-45p4)
E2348 142348 2002 RX211 from Atlante Obs. (Dec. 21.03p3), LINEAR (Dec. 21.32-37p5), and CSS (Dec. 21.38-40p5)
E1765 141765 2002 MP3 from CSS (Dec. 20.33p3), LINEAR (Dec. 20.33-38p5), and El Guijo Obs. (Dec. 21.07-10p3)
E1052 141052 2001 XR1 from El Guijo Obs. (Dec. 21.05-07p3 & 22.02-03p3)
D7924 137924 2000 BD19 from LINEAR (Dec. 21.39-42p3)
D7805 137805 1999 YK5 from Marana Obs. (Dec. 8.82p5), LINEAR (Dec. 20.08-12p4), and Posadas Obs. (Dec. 21.89-90p3)
D7799 137799 1999 YB from CSS (Dec. 21.21-24p4)
D6923 136923 1998 JH2 from Stia Obs. (Dec. 21.79-80p2)
D6849 136849 1998 CS1 from CSS (Dec. 22.38-40p4)
D6635 136635 1994 VA1 from CSS (Dec. 22.32-33p4)
96315 96315 1997 AP10 from Spacewatch 0.9m (Dec. 21.35-39p3)
85236 85236 1993 KH from LINEAR (Dec. 22.13-18p5) and CSS (Dec. 22.18-20p4)
68372 68372 2001 PM9 from LINEAR (Dec. 21.25-29p4) and MLS (Dec. 22.21-22p4)
65733 65733 1993 PC from CSS (Dec. 22.09-10p4)
55532 55532 2001 WG2 from CSS (Dec. 22.25-27p4)
54071 54071 2000 GQ146 from CSS (Dec. 21.13-15p4) and LINEAR (Dec. 21.14-18p4)
53430 53430 1999 TY16 from SSS (Dec. 20.45-48p4)
52768 52768 1998 OR2 from LINEAR (Dec. 20.39-45p5)
39572 39572 1993 DQ1 from LINEAR (Dec. 22.09-11p3) and CSS (Dec. 22.15-17p4)
36284 36284 2000 DM8 from LINEAR (Dec. 22.38-41p4)
35107 35107 1991 VH from SSS (Dec. 19.66-69p3)
20460 20460 Robwhiteley (1999 LO28) from Stia Obs. (Dec. 21.81-84p4)
19764 19764 2000 NF5 from MLS (Dec. 21.48-49p4)
18106 18106 Blume (2000 NX3) from MLS (Dec. 21.43-44p4)
17511 17511 1992 QN from LINEAR (Dec. 21.43-47p5)
12923 12923 Zephyr (1999 GK4) from CSS (Dec. 22.37-39p4)
12711 12711 Tukmit (1991 BB) from Jaen Obs. (Dec. 20.16-17p3)
11500 11500 Tomaiyowit (1989 UR) from CSS (Dec. 21.10-12p4)
08567 8567 1996 HW1 from Deep Sky Obs. (Dec. 20.86-91p5)
08013 8013 Gordonmoore (1990 KA) from MLS (Dec. 21.38-40p4)
07358 7358 Oze (1995 YA3) from Jaen Obs. (Dec. 20.99-00p2), Atlante Obs. (Dec. 21.05-06p3), LINEAR (Dec. 21.32-37p5), and MLS (Dec. 22.33-34p4)
06569 6569 Ondaatje (1993 MO) from Goodricke-Pigott Obs. (Dec. 19.27-28p2)
06178 6178 1986 DA from MLS (Dec. 21.12-14p4)
05189 5189 1990 UQ from MLS (Dec. 22.38-40p4) and Spacewatch 0.9m (Dec. 22.48-51p3)
04544 4544 Xanthus (1989 FB) from CSS (Dec. 21.08-10p4 & 22.07-09p3)
04486 4486 Mithra (1987 SB) from MLS (Dec. 20.29-32p4)
04179 4179 Toutatis (1989 AC) from Campomaggiore Obs. (Dec. 8.01-02p3 & 9.02-03p3) and Hamamatsu-Yuto Obs. (Dec. 20.76-77p7)
03360 3360 Syrinx (1981 VA) from CSS (Dec. 22.15-17p4)
03122 3122 Florence (1981 ET3) from Crni Vrh Obs. (Dec. 23.16-19p4)
03102 3102 Krok (1981 QA) from Spacewatch 0.9m (Dec. 22.52-55p3)
02368 2368 Beltrovata (1977 RA) from Lulin Minor Bodies Tracking (LIMIT) (Dec. 19.67-69p3), LINEAR (Dec. 21.32-37p5), Spacewatch 0.9m (Dec. 21.36-40p3), and MLS (Dec. 21.44-45p2)
01980 1980 Tezcatlipoca (1950 LA) from CSS (Dec. 22.07-08p4)
01864 1864 Daedalus (1971 FA) from Jaen Obs. (Dec. 20.15-16p3)
01627 1627 Ivar (1929 SH) from Linceo Obs. (Dec. 22.84-85p3)

MPEC 2008-Y49 - "04:01 UT" - 2008 JY30

K08J30Y 2008 JY30 (Q=4.174 AU, H=18.6 ~645m) from Calar Alto Obs. (Dec. 23.18-21p3 at C=22.0-22.5 & 24.11-14p2 at C=21.8-22.2)

Observers on 24 December '08

A total of 37 observing facilities appear in today's MPECs.

Code	Observer / observatory
`J51`	Atlante Obs. in the Canary Islands, 4 in MPEC 2008-Y50 -- 2008 SQ1, 2008 EV5, 142348, 7358
`493`	Calar Alto Obs. in Spain, 1 in MPEC 2008-Y49 -- 2008 JY30
`B80`	Campomaggiore Obs., 1 in MPEC 2008-Y50 -- 4179
`703`	Catalina Sky Survey (CSS) in Arizona, 28 in MPEC 2008-Y50 -- 2008 WZ94, 2008 WQ63, 2008 WN2, 2008 TK157, 2008 SH82, 2008 QT3, 2005 XM4, 2003 YO1, 2003 UX34, 2001 VK5, 2001 OE84, 85236, 65733, 55532, 54071, 39572, 194386, 189973, 142348, 141765, 137799, 136849, 136635, 12923, 11500, 4544, 3360, 1980
`A94`	Cormons Obs. in Italy, 1 in MPEC 2008-Y50 -- 162900
`106`	Crni Vrh Obs. in Slovenia, 2 in MPEC 2008-Y50 -- 2008 XE2, 3122
`B60`	Deep Sky Obs. in Germany, 1 in MPEC 2008-Y50 -- 8567
`448`	Desert Moon Obs. in New Mexico, 10 in MPEC 2008-Y50 -- 2008 XV2, 2008 XP2, 2008 XN, 2008 WN2, 2008 WH60, 2008 UC95, 2008 TE157, 2008 TD27, 2005 SN25, 2001 WT1
`J27`	El Guijo Obs. in Spain, 6 in MPEC 2008-Y50 -- 2008 WQ63, 2005 WS55, 1994 AW1, 200754, 141765, 141052
`B23`	Fiamene Obs. in Italy, 1 in MPEC 2008-Y50 -- 2008 SQ1
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-Y50 -- 6569
`379`	Hamamatsu-Yuto Obs. in Japan, 6 in MPEC 2008-Y50 -- 2008 WQ63, 2008 WL60, 2008 SQ1, 2005 TZ51, 2000 FL1, 4179
`J28`	Jaen Obs. in Spain, 3 in MPEC 2008-Y50 -- 12711, 7358, 1864
`704`	LINEAR in New Mexico, 26 in MPEC 2008-Y50 -- 2008 YF, 2008 WQ63, 2008 UC95, 2008 SH82, 2007 MK13, 2005 XM4, 1994 AW1, 85236, 68372, 54071, 52768, 39572, 36284, 202435, 199801, 198752, 189058, 17511, 152931, 143651, 142348, 141765, 137924, 137805, 7358, 2368
`J59`	Linceo Obs. in Spain, 1 in MPEC 2008-Y50 -- 1627
`540`	Linz Obs. in Austria, 1 in MPEC 2008-Y50 -- 2008 WZ94
`D35`	Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2008-Y50 -- 2368
`130`	Lumezzane Obs. in Italy, 3 in MPEC 2008-Y50 -- 2008 SH82, 2005 XM4, 2002 VY94
`560`	Madonna di Dossobuono Obs. in Italy, 4 in MPEC 2008-Y50 -- 2008 XB1, 2008 SH82, 2008 QT3, 2005 YS
`H01`	Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2008-Y50 -- 2008 WK96
`B79`	Marana Obs., 4 in MPEC 2008-Y50 -- 2008 MZ, 199801, 194386, 137805
`A06`	Mataro Obs. in Spain, 2 in MPEC 2008-Y50 -- 2008 WL60, 162900
`5682`	David Tholen's team on Mauna Kea in Hawaii, 3 in MPEC 2008-Y50 -- 2008 EE, 2007 VL8, 2005 CV25
`B67`	Mirasteilas Obs. in Switzerland, 3 in MPEC 2008-Y50 -- 2008 XE3, 2008 WQ63, 2008 EV5
`474`	Mt. John Obs. in New Zealand, 2 in MPEC 2008-Y50 -- 2008 YA, 2003 QM47
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 19 in MPEC 2008-Y50 -- 2008 WZ94, 2008 WH60, 2008 VG14, 2006 OB5, 2005 XM4, 2005 VY17, 2003 YL, 68372, 200840, 19764, 18106, 175114, 153220, 8013, 7358, 6178, 5189, 4486, 2368
`A13`	Naef Obs. in Switzerland, 1 in MPEC 2008-Y50 -- 2008 YL2
`A53`	Peschiera del Garda Obs. in Italy, 3 in MPEC 2008-Y50 -- 2008 WQ63, 2008 SQ1, 2008 EV5
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2008-Y50 -- 2008 WQ63, 2008 WL60, 2008 SQ1, 2008 EV5, 2005 TZ51, 2002 VY94
`J53`	Posadas Obs. in Spain, 1 in MPEC 2008-Y50 -- 137805
`233`	San Vito Obs. in Italy, 1 in MPEC 2008-Y50 -- 1994 AW1
`204`	Schiaparelli Obs. in Italy, 2 in MPEC 2008-Y50 -- 2008 EV5, 2005 BC
`E12`	Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2008-Y50 -- 2008 YQ2, 2006 WY2, 2006 SZ217, 53430, 35107
`587`	Sormano Obs. in Italy, 2 in MPEC 2008-Y50 -- 2008 YP2, 2008 YF
`691`	Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2008-Y50 -- 96315, 159923, 159368, 5189, 3102, 2368
`291`	Spacewatch 1.8m telescope in Arizona, 28 in MPEC 2008-Y50 -- 2008 XU2, 2008 XO2, 2008 XN, 2008 XM, 2008 XL1, 2008 XK1, 2008 WZ94, 2008 WZ13, 2008 WN2, 2008 WM64, 2008 WK96, 2008 WK32, 2008 WJ96, 2008 WJ60, 2008 WF14, 2008 VA15, 2008 UU1, 2008 SX7, 2006 SU131, 2006 BC10, 2005 SN25, 2005 SB71, 2005 AY28, 2002 EL6, 2002 AC5, 2001 QA143, 2000 AZ93, 1993 VD
`A78`	Stia Obs. in Italy, 8 in MPEC 2008-Y50 -- 2008 XE2, 2008 VK14, 2008 UC, 2008 SH82, 2008 MZ, 20460, 200840, 136923

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 24 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 YJ3	NEODyS	1416	2012-2090	132	2.4e-07	-3.83	-5.16	0	NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2008/12/22.268 to 2008/12/23.475."

2008 XU2	JPL Sentry	1415	2039	1	9.3e-08	-7.14	-7.14	0	JPL: "Analysis based on 31 observations spanning 16.275 days (2008-Dec-06.2616 to 2008-Dec-22.53631)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
2008 XU2	NEODyS	1415	R E M O V E D						-

2008 XO2	JPL Sentry	1415	R E M O V E D						JPL: Risk listing removed at 0949 UTC.
2008 XO2	NEODyS	1415	R E M O V E D						-

2008 WK96	JPL Sentry	1415	R E M O V E D						JPL: Risk listing removed at 0953 UTC.
2008 WK96	NEODyS	1415	R 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 24 December '08

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

1416	Grabbed MPEC 2008-Y50 - Daily Orbit Update - see above
1415	Noted that JPL Sentry has removed 2008 WK96 as an impact risk - see above Noted that NEODyS has removed 2008 WK96 as an impact risk - see above Noted that JPL Sentry has removed 2008 XO2 as an impact risk - see above Noted that NEODyS has removed 2008 XO2 as an impact risk - see above Noted 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 YJ3 as an impact risk - see above
0506	Grabbed MPEC 2008-Y49 - 2008 JY30 - see above

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