2008-12-07 Tracking News

Contents on 7 December '08

IAU Minor Planet Center
- NEOCP Activity -- five listings: 1 new, 4 updated
- New MPECs -- six MPECs
Observers -- seventeen observing facilities
Impact Risk Monitoring -- nine 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 7 December '08

The MPC's NEO Confirmation Page has 5 listings: 1 new, 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and four updated listings. Of these, four were "one nighters." So far The Tracking News has counted a total of eleven 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 7 December '08

Minor Planet Electronic Circulars

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

MPEC 2008-X53 time-stamped "05:42 UT" - 2006 UX184, 2008 UZ184 - see below
MPEC 2008-X54 time-stamped "07:11 UT" - Daily Orbit Update - see below
MPEC 2008-X55 time-stamped "17:52 UT" - 2008 XU2 - see below
MPEC 2008-X56 time-stamped "18:00 UT" - 2008 XV2 - see below
MPEC 2008-X57 time-stamped "18:03 UT" - 2008 XW2 - see below
MPEC 2008-X58 time-stamped "18:06 UT" - 2008 XX2

MPEC 2008-X58 - "18:06 UT" - 2008 XX2

K08X02X 2008 XX2 (H=21.4 ~178m) was discovered at 1053 UT on 6 Dec. by the Mt. Lemmon Survey (MLS), which observed it at Dec. 6.45-54p8. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Dec. 6.53-54p2 & 7.31p3) and Great Shefford Obs. (Dec. 7.04-07p3).

MPEC 2008-X57 - "18:03 UT" - 2008 XW2

K08X02W 2008 XW2 (H=20.6 ~257m) was discovered at 1002 UT on 6 Dec. by the Catalina Sky Survey (CSS), which observed it at Dec. 6.42-44p4 and 6.53p4. The discovery was confirmed by MRO (Dec. 6.45-46p5 & 7.46p5), Great Shefford Obs. (Dec. 6.98-99p3 & 7.19-20p3), Sormano Obs. (Dec. 7.00-01p3), Sabino Canyon Obs. (Dec. 7.39p3), and MLS (Dec. 7.45-47p4).

MPEC 2008-X56 - "18:00 UT" - 2008 XV2

K08X02V 2008 XV2 (H=20.2 ~309m) was discovered at 0720 UT on 6 Dec. by MLS, which observed it at Dec. 6.31-33p4 and 7.27-28p4. The discovery was confirmed by Great Shefford Obs. (Dec. 6.92-94p3), MRO (Dec. 7.24-25p4), and Sabino Canyon Obs. (Dec. 7.43p2).

MPEC 2008-X55 - "17:52 UT" - 2008 XU2

K08X02U 2008 XU2 (risk-listed, Q=4.001 AU, Earth MOID=2.1 LD, H=25.5 ~27m) was discovered at 0616 UT on 6 Dec. by MLS, which observed it at Dec. 6.26-33p7 and 7.25-26p3. The discovery was confirmed by MRO (Dec. 6.31-32p5 & 7.22-23p4), Great Shefford Obs. (Dec. 6.90-91p3), Astronomical Research Obs. (ARO) (Dec. 7.38-39p3), and Sabino Canyon Obs. (Dec. 7.41-42p2). This object was within ten lunar distances (LD) of Earth, reaching 2.4 LD on 30 Nov.

<< DOU on 7 Dec. '08 >> MPEC 2008-X54 - "07:11 UT" - Daily Orbit Update

Observations of risk-listed objects
K08X02Q 2008 XQ2 (arc=2 days, H=20.0 ~339m) from Great Shefford Obs. (Dec. 7.15-16p3)
K08X02P 2008 XP2 (arc=2 days, H=18.3 ~741m) from Great Shefford Obs. (Dec. 7.11-12p3)
K08X02O 2008 XO2 (arc=2 days, H=18.7 ~616m) from Great Shefford Obs. (Dec. 6.86-88p2) and MRO (Dec. 7.19-20p3)
K08X01M 2008 XM1 (almost small, Q=4.172 AU, arc=3 days, H=22.0 ~135m) from the Spacewatch 1.8m telescope (Dec. 6.33-34p3), Kinver Obs. (Dec. 6.77-81p8), Great Shefford Obs. (Dec. 6.83-84p3), Sormano Obs. (Dec. 6.91p4), Petit Jean Mtn. South Obs. (PJMSO) (Dec. 7.09-10p9), and MRO (Dec. 7.21-22p5)
K08X01C 2008 XC1 (small asteroid, arc=4 days, H=23.6 ~65m) from Spacewatch 1.8m (Dec. 6.21-22p3), Desert Moon Obs. (Dec. 6.29p5), Sormano Obs. (Dec. 6.96-97p3), and PJMSO (Dec. 7.15p7)
K08W96K 2008 WK96 (small asteroid, arc=7 days, H=22.9 ~89m) from Great Shefford Obs. (Dec. 7.20-21p3)
K08W94Y 2008 WY94 (small asteroid, arc=7 days, H=25.6 ~26m) from MLS (Dec. 6.11p3)
K08W13Z 2008 WZ13 (arc=17 days, H=18.7 ~616m) from ARO (Dec. 5.19-21p3), Spacewatch 1.8m (Dec. 6.16-17p3), and Great Shefford Obs. (Dec. 6.77-82p3)
Observations of recently (no longer) risk-listed objects
K08X02B 2008 XB2 (small asteroid, arc=3 days, H=24.9 ~35m) from Spacewatch 1.8m (Dec. 6.35-36p3) and MRO (Dec. 7.17p4)
K08X00O 2008 XO (small asteroid, arc=3 days, H=24.1 ~51m) from ARO (Dec. 5.13-14p3)
K08X00N 2008 XN (arc=4 days, H=21.3 ~186m) from Spacewatch 1.8m (Dec. 6.23p3)
K08W96J 2008 WJ96 (small asteroid, arc=6 days, H=25.7 ~25m) from ARO (Dec. 5.27-28p3) and Spacewatch 1.8m (Dec. 6.40p3)
K08W96H 2008 WH96 (small asteroid, arc=6 days, H=23.1 ~81m) from Spacewatch 1.8m (Dec. 6.41-42p3)
K08W59B 2008 WB59 (arc=12 days, H=19.4 ~446m) from ARO (Dec. 5.31p4)
K08W32Y 2008 WY32 (small asteroid, arc=14 days, H=22.3 ~117m) from Spacewatch 1.8m (Dec. 6.15-16p3)
K08W32K 2008 WK32 (arc=15 days, H=19.3 ~467m) from Spacewatch 1.8m (Dec. 6.18-19p3)
K08W14D 2008 WD14 (small asteroid, arc=14 days, H=22.8 ~93m) from ARO (Dec. 5.31-32p5)
K08W01P 2008 WP1 (arc=17 days, H=20.3 ~295m) from Spacewatch 1.8m (Dec. 6.13-14p3)
K08W00L 2008 WL (almost small, Q=4.483 AU, arc=17 days, H=21.8 ~148m) from ARO (Dec. 5.35-36p6)
Observations of small asteroids (H>22.0)
K08X01K 2008 XK1 (arc=2 days, H=23.6 ~65m) from ARO (Dec. 5.24-26p6)
K08X00S 2008 XS (arc=3 days, H=27.1 ~13m) from ARO (Dec. 5.30p2)
K08X00G 2008 XG (arc=5 days, H=24.4 ~45m) from MLS (Dec. 6.24-25p4)
K08X00F 2008 XF (arc=5 days, H=23.0 ~85m) from Spacewatch 1.8m (Dec. 6.28-29p3)
K08W96G 2008 WG96 (arc=6 days, H=26.2 ~19m) from Spacewatch 1.8m (Dec. 5.41-43p3 & 6.31-32p3 at V=22.1)
K08W96E 2008 WE96 (arc=6 days, H=23.7 ~62m) from LINEAR (Dec. 6.21-24p4)
K08W61M 2008 WM61 (arc=11 days, H=26.7 ~15m) from ARO (Dec. 5.38-40p3)
K08W14G 2008 WG14 (arc=16 days, H=24.8 ~37m) from Great Shefford Obs. (Dec. 7.22-23p3)
K08W00K 2008 WK (arc=18 days, H=23.2 ~78m) from LINEAR (Dec. 6.36-42p5)
K08T02C 2008 TC2 (arc=47 days, H=23.3 ~74m) from David Tholen's team on Mauna Kea (Oct. 9.40-41p4)
Observations of other objects
K08X02A 2008 XA2 (arc=3 days, H=21.4 ~178m) from ARO (Dec. 5.09-11p3), LINEAR (Dec. 6.20-24p4), Sormano Obs. (Dec. 6.88p3), and PJMSO (Dec. 7.10p7)
K08X01B 2008 XB1 (arc=4 days, H=20.8 ~234m) from Sormano Obs. (Dec. 6.82-83p3) and Great Shefford Obs. (Dec. 6.84-85p3)
K08X00P 2008 XP (arc=4 days, H=21.4 ~178m) from ARO (Dec. 5.27-28p4)
K08X00J 2008 XJ (Q=4.282 AU, arc=4 days, H=21.0 ~214m) from ARO (Dec. 5.32-34p3 at V=21.8-22.1)
K08W94Z 2008 WZ94 (q=0.329 AU, arc=5 days, H=20.1 ~323m) from Desert Moon Obs. (Dec. 4.39-41p3) and ARO (Dec. 5.24-26p5)
K08W60L 2008 WL60 (arc=14 days, H=18.1 ~812m) from ARO (Dec. 5.34-35p6) and PJMSO (Dec. 7.20-21p6)
K08W60H 2008 WH60 (arc=13 days, H=20.8 ~234m) from LINEAR (Dec. 6.20-24p4)
K08W02N 2008 WN2 (arc=44 days, H=20.8 ~234m) from PJMSO (Dec. 7.11-13p6)
K08V14K 2008 VK14 (arc=29 days, H=19.3 ~467m) from ARO (Dec. 5.36-37p6), Hamamatsu-Yuto Obs. (Dec. 5.72-75p5 & 6.74p2), and PJMSO (Dec. 7.20p6)
K08V04U 2008 VU4 (Q=4.211 AU, arc=30 days, H=17.5 ~1.07 km) from Hamamatsu-Yuto Obs. (Dec. 5.65-67p4 & 6.64-67p5) and PJMSO (Dec. 7.18-19p6)
K08V00F 2008 VF (arc=34 days, H=19.5 ~426m) from ARO (Dec. 5.32-33p5)
K08U90L 2008 UL90 (IEO, Q=0.959 AU, arc=42 days, H=18.5 ~676m) from Great Shefford Obs. (Dec. 7.17-18p3)
K08U90K 2008 UK90 (arc=40 days, H=18.8 ~589m) from Desert Moon Obs. (Dec. 6.14-19p3)
K08U07E 2008 UE7 (arc=41 days, H=20.4 ~282m) from ARO (Dec. 5.37-38p6) and Hamamatsu-Yuto Obs. (Dec. 5.75-77p8 & 6.76-77p2)
K08T02D 2008 TD2 (arc=64 days, H=21.7 ~155m) from Spacewatch 1.8m (Dec. 6.19-21p3)
K08SO5X 2008 SX245 (arc=68 days, H=17.8 ~933m) from Desert Moon Obs. (Dec. 6.06-10p3)
K08S07V 2008 SV7 (arc=72 days, H=21.6 ~162m) from LINEAR (Dec. 4.28-30p3) and ARO (Dec. 5.38-39p4)
K08S07P 2008 SP7 (Q=4.200 AU, arc=73 days, H=18.9 ~562m) from ARO (Dec. 5.23-24p4)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.4 ~708m) from Hamamatsu-Yuto Obs. (Dec. 5.49-53p5 & 6.49-56p10), LINEAR (Dec. 6.19-24p5), and PJMSO (Dec. 7.08p6)
K08S00E 2008 SE (arc=76 days, H=19.4 ~446m) from ARO (Dec. 5.22-23p3)
K08R26T 2008 RT26 (arc=90 days, H=19.4 ~446m) from ARO (Dec. 5.40-41p3) and LINEAR (Dec. 6.32-37p5)
K08M05B 2008 MB5 (arc=158 days, H=19.0 ~537m) from ARO (Dec. 5.43-44p3)
K08M01R 2008 MR1 (arc=3 opp, H=18.4 ~708m) from MLS (Dec. 6.16-19p4)
K08M00Z 2008 MZ (Q=4.207 AU, arc=175 days, H=18.6 ~645m) from ARO (Dec. 5.34p4), Hamamatsu-Yuto Obs. (Dec. 5.70-71p3 & 6.69-71p5), LINEAR (Dec. 6.26-31p5), and PJMSO (Dec. 7.17-18p6)
K07V08L 2007 VL8 (arc=2 opp, H=21.2 ~195m) from ARO (Dec. 5.29-31p3)
K06V14B 2006 VB14 (arc=2 opp, H=18.5 ~676m) from Hamamatsu-Yuto Obs. (Dec. 5.78-80p8 & 6.79-80p2)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.4 ~1.12 km) from Hamamatsu-Yuto Obs. (Dec. 5.61-64p9 & 6.62-64p5) and PJMSO (Dec. 7.19p5)
K06S49U 2006 SU49 (arc=3 opp, H=19.5 ~426m) from MLS (Dec. 6.51-53p4)
K05W55S 2005 WS55 (arc=4 opp, H=16.0 ~2.14 km, q=1.108 AU) from MLS (Dec. 6.08-09p3)
K05T51Z 2005 TZ51 (arc=3 opp, H=17.9 ~891m) from PJMSO (Dec. 7.02-03p5)
K03U34X 2003 UX34 (arc=4 opp, H=20.2 ~309m) from Bergen-Enkheim Obs. (Dec. 4.03-06p3)
K02X90P 2002 XP90 (arc=3 opp, H=18.4 ~708m) from CSS (Dec. 6.48-50p4)
K02V94Y 2002 VY94 (Q=5.375 AU, arc=2 opp, H=16.7 ~1.55 km) from PJMSO (Dec. 7.14p5)
K01W25A 2001 WA25 (arc=4 opp, H=18.6 ~645m) from Hamamatsu-Yuto Obs. (Dec. 5.80-82p7 & 6.83-84p4)
K01L05M 2001 LM5 (arc=3 opp, H=19.3 ~467m) from Hamamatsu-Yuto Obs. (Dec. 5.56-60p5 & 6.57-61p8) and PJMSO (Dec. 7.13-14p5)
K00QD0K 2000 QK130 (arc=3 opp, H=20.6 ~257m) from Spacewatch 1.8m (Dec. 6.45-46p3)
J99C08W 1999 CW8 (arc=3 opp, H=18.5 ~676m) from MLS (Dec. 6.45-50p4 at V=21.4-22.4)
J98X02M 1998 XM2 (arc=6 opp, H=17.1 ~1.29 km) from ARO (Dec. 5.43p2)
J9801 199801 2007 AE12 from CSS (Dec. 6.23-25p4)
J8856 198856 2005 LR3 from LINEAR (Dec. 6.44-49p6) and CSS (Dec. 6.45-47p4)
G3683 163683 2002 YP2 from CSS (Dec. 6.39-41p4)
G2004 162004 1991 VE from LINEAR (Dec. 6.35p1)
E1052 141052 2001 XR1 from LINEAR (Dec. 6.38-43p4)
D8859 138859 2000 WN63 from LINEAR (Dec. 6.25-30p4)
D6923 136923 1998 JH2 from LINEAR (Dec. 6.31-36p5)
85236 85236 1993 KH from LINEAR (Dec. 6.13-18p5)
20460 20460 Robwhiteley (1999 LO28) from Jarnac Obs. (Dec. 6.40-44p3)
02212 2212 Hephaistos (1978 SB) from LINEAR (Dec. 6.21-25p4)

MPEC 2008-X53 - "05:42 UT" - 2006 UX184, 2008 UZ184

K06UI4Z 2006 UZ184 (KBO, q=30.388 AU, Q=48.251 AU, H=7.3 ~117 km) from Joel Parker via Kitt Peak Natl. Obs. (KPNO) (Oct. 23.38p1 at r=22.4, 23.44p1 at r=22.2, 24.34p1 at r=22.3 & 24.44p1 at r=22.4)
K06UI4X 2006 UX184 (i=37.4°, q=20.154 AU, Q=54.686 AU, H=8.3 ~74.1 km) from Parker/KPNO (Oct. 23.38p1, 23.43p1, 24.33p1 & 24.43p1)

Observers on 7 December '08

Seventeen observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 26 in MPECs 2008-X54 & 2008-X55 -- 2008 XU2, 2008 XS, 2008 XP, 2008 XO, 2008 XK1, 2008 XJ, 2008 XA2, 2008 WZ94, 2008 WZ13, 2008 WM61, 2008 WL60, 2008 WL, 2008 WJ96, 2008 WD14, 2008 WB59, 2008 VK14, 2008 VF, 2008 UE7, 2008 SV7, 2008 SP7, 2008 SE, 2008 RT26, 2008 MZ, 2008 MB5, 2007 VL8, 1998 XM2
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2008-X54 -- 2003 UX34
`703`	Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2008-X54 & 2008-X57 -- 2008 XW2, 2002 XP90, 199801, 198856, 163683
`448`	Desert Moon Obs. in New Mexico, 4 in MPEC 2008-X54 -- 2008 XC1, 2008 WZ94, 2008 UK90, 2008 SX245
`J95`	Great Shefford Obs. in England, 13 in MPECs 2008-X54, 2008-X55, 2008-X56, 2008-X57 & 2008-X58 -- 2008 XX2, 2008 XW2, 2008 XV2, 2008 XU2, 2008 XQ2, 2008 XP2, 2008 XO2, 2008 XM1, 2008 XB1, 2008 WZ13, 2008 WK96, 2008 WG14, 2008 UL90
`379`	Hamamatsu-Yuto Obs. in Japan, 9 in MPEC 2008-X54 -- 2008 VU4, 2008 VK14, 2008 UE7, 2008 SQ1, 2008 MZ, 2006 VB14, 2006 SZ217, 2001 WA25, 2001 LM5
`G92`	Jarnac Obs. in Arizona, 1 in MPEC 2008-X54 -- 20460
`J66`	Kinver Obs. in England, 1 in MPEC 2008-X54 -- 2008 XM1
`6959`	Joel Parker via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPEC 2008-X53 -- 2006 UZ184, 2006 UX184
`704`	LINEAR in New Mexico, 15 in MPEC 2008-X54 -- 2008 XA2, 2008 WK, 2008 WH60, 2008 WE96, 2008 SV7, 2008 SQ1, 2008 RT26, 2008 MZ, 85236, 198856, 162004, 141052, 138859, 136923, 2212
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 7 in MPECs 2008-X54, 2008-X55, 2008-X56, 2008-X57 & 2008-X58 -- 2008 XX2, 2008 XW2, 2008 XV2, 2008 XU2, 2008 XO2, 2008 XM1, 2008 XB2
`5682`	David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-X54 -- 2008 TC2
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2008-X54, 2008-X55, 2008-X56, 2008-X57 & 2008-X58 -- 2008 XX2, 2008 XW2, 2008 XV2, 2008 XU2, 2008 XG, 2008 WY94, 2008 MR1, 2006 SU49, 2005 WS55, 1999 CW8
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2008-X54 -- 2008 XM1, 2008 XC1, 2008 XA2, 2008 WN2, 2008 WL60, 2008 VU4, 2008 VK14, 2008 SQ1, 2008 MZ, 2006 SZ217, 2005 TZ51, 2002 VY94, 2001 LM5
`854`	Sabino Canyon Obs. in Arizona, 3 in MPECs 2008-X55, 2008-X56 & 2008-X57 -- 2008 XW2, 2008 XV2, 2008 XU2
`587`	Sormano Obs. in Italy, 5 in MPECs 2008-X54 & 2008-X57 -- 2008 XW2, 2008 XM1, 2008 XC1, 2008 XB1, 2008 XA2
`291`	Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2008-X54 -- 2008 XN, 2008 XM1, 2008 XF, 2008 XC1, 2008 XB2, 2008 WZ13, 2008 WY32, 2008 WP1, 2008 WK32, 2008 WJ96, 2008 WH96, 2008 WG96, 2008 TD2, 2000 QK130

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

Impact Risk Monitoring on 7 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 XU2	JPL Sentry	1958	2039-2094	2	4.1e-08	-7.50	-7.50	0	JPL: "Analysis based on 27 observations spanning 1.1543 days (2008-Dec-06.2616 to 2008-Dec-07.41587)." Diameter approximately 0.026 km. from mean, weighted H=25.5.

2008 XQ2	JPL Sentry	1552	2012-2106	76	1.6e-06	-3.04	-3.15	0	JPL: "Analysis based on 23 observations spanning 1.7423 days (2008-Dec-05.41531 to 2008-Dec-07.15761)." Diameter approximately 0.338 km. from mean, weighted H=20.0.
2008 XQ2	NEODyS	1552	2015-2088	17	4.35e-07	-3.19	-3.22	0	NEODyS: "Based on 23 optical observations (of which 1 are rejected as outliers) from 2008/12/05.416 to 2008/12/07.158."

2008 XP2	JPL Sentry	1552	R E M O V E D						JPL: Risk listing removed at 1039 UTC.

2008 XO2	JPL Sentry	1552	2053-2090	2	2.9e-09	-5.28	-5.31	0	JPL: "Analysis based on 23 observations spanning 2.0053 days (2008-Dec-05.19431 to 2008-Dec-07.19959)." Diameter approximately 0.809 km. from mean, weighted H=18.1.
2008 XO2	NEODyS	1552	2027-2064	7	1.35e-08	-4.58	-5.20	0	NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2008/12/05.195 to 2008/12/07.200."

2008 XM1	JPL Sentry	1552	R E M O V E D						JPL: Risk listing removed at 1033 UTC.
2008 XM1	NEODyS	1552	R E M O V E D						-

2008 XC1	JPL Sentry	1552	2085-2088	2	3.2e-06	-4.98	-5.23	0	JPL: "Analysis based on 50 observations spanning 3.7845 days (2008-Dec-03.36799 to 2008-Dec-07.15247)." Diameter approximately 0.067 km. from mean, weighted H=23.5.
2008 XC1	NEODyS	1552	2085-2088	2	3.07e-06	-4.99	-5.24	0	NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2008/12/03.369 to 2008/12/07.153."

2008 WK96	JPL Sentry	1552	2024-2031	2	6.6e-05	-2.69	-2.69	0	JPL: "Analysis based on 28 observations spanning 6.8215 days (2008-Nov-30.38762 to 2008-Dec-07.20912)." Diameter approximately 0.088 km. from mean, weighted H=22.9.
2008 WK96	NEODyS	1552	2024-2032	4	6.22e-05	-2.71	-2.71	0	NEODyS: "Based on 28 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/07.210."

2008 WY94	JPL Sentry	1552	2054-2073	6	7.7e-06	-5.70	-5.82	0	JPL: "Analysis based on 28 observations spanning 6.5684 days (2008-Nov-29.54021 to 2008-Dec-06.10859)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
2008 WY94	NEODyS	1552	2068-2087	13	1.04e-05	-5.56	-5.67	0	NEODyS: "Based on 29 optical observations (of which 1 are rejected as outliers) from 2008/11/29.541 to 2008/12/06.109."

2008 WZ13	NEODyS	1801	R E M O V E D						-
2008 WZ13	JPL Sentry	1552	R E M O V E D						JPL: Risk listing removed at 0951 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 7 December '08

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

1958	Noted that JPL Sentry has posted 2008 XU2 as an impact risk - see above
1859	Grabbed MPEC 2008-X56 - 2008 XV2 - see above Grabbed MPEC 2008-X57 - 2008 XW2 - see above Grabbed MPEC 2008-X58 - 2008 XX2 - see above
1801	Noted that NEODyS has removed 2008 WZ13 as an impact risk - see above Grabbed MPEC 2008-X55 - 2008 XU2 - see above
1552	Noted that JPL Sentry has updated its 2008 WK96 risk assessment - see above Noted that NEODyS has updated its 2008 WK96 risk assessment - see above Noted that JPL Sentry has updated its 2008 WY94 risk assessment - see above Noted that NEODyS has updated its 2008 WY94 risk assessment - see above Noted that JPL Sentry has removed 2008 WZ13 as an impact risk - see above Noted that JPL Sentry has updated its 2008 XC1 risk assessment - see above Noted that NEODyS has updated its 2008 XC1 risk assessment - see above Noted that JPL Sentry has removed 2008 XM1 as an impact risk - see above Noted that NEODyS has removed 2008 XM1 as an impact risk - see above Noted that JPL Sentry has updated its 2008 XO2 risk assessment - see above Noted that NEODyS has posted 2008 XO2 as an impact risk - see above Noted that JPL Sentry has removed 2008 XP2 as an impact risk - see above Noted that JPL Sentry has posted 2008 XQ2 as an impact risk - see above Noted that NEODyS has posted 2008 XQ2 as an impact risk - see above Grabbed MPEC 2008-X54 - Daily Orbit Update - see above
0622	Grabbed MPEC 2008-X53 - 2006 UX184, 2008 UZ184 - see above

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