2008-12-03 Tracking News

Contents on 3 December '08

IAU Minor Planet Center
- NEOCP Activity -- four listings: 4 updated
- New MPECs -- nine MPECs
Observers -- 21 observing facilities
Impact Risk Monitoring -- seven 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 3 December '08

The MPC's NEO Confirmation Page has 4 listings: 4 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four updated listings. All of these were "one nighters." So far The Tracking News has counted a total of fifteen 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 3 December '08

Minor Planet Electronic Circulars

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

MPEC 2008-X26 time-stamped "04:34 UT" - 2005 QU182 - see below
MPEC 2008-X27 time-stamped "07:10 UT" - Daily Orbit Update - see below
MPEC 2008-X28 time-stamped "13:36 UT" - 2008 XM - see below
MPEC 2008-X29 time-stamped "13:38 UT" - 2008 XN - see below
MPEC 2008-X30 time-stamped "13:41 UT" - 2008 XO - see below
MPEC 2008-X31 time-stamped "15:21 UT" - 2008 XP - see below
MPEC 2008-X32 time-stamped "15:24 UT" - 2008 XS - see below
MPEC 2008-X33 time-stamped "23:38 UT" - 2008 XB1 - see below
MPEC 2008-X34 time-stamped "23:41 UT" - 2008 XC1

MPEC 2008-X34 - "23:41 UT" - 2008 XC1

K08X01C 2008 XC1 (small asteroid, Earth MOID=2.4 LD, H=23.1 ~81m) was discovered at 0849 UT on 3 Dec. by the Catalina Sky Survey (CSS), which observed it at Dec. 3.37-42p8. The discovery was confirmed by Bergen-Enkheim Obs. (Dec. 3.85-89p5). This object will be coming within ten lunar distances (LD) of Earth, reaching 4.3 LD on 13 Dec.

MPEC 2008-X33 - "23:38 UT" - 2008 XB1

K08X01B 2008 XB1 (H=20.6 ~257m) was discovered at 0325 UT on 3 Dec. by CSS, which observed it at Dec. 3.14-16p5 and 3.23p2. The discovery was confirmed by Schiaparelli Obs. (Dec. 3.72p1 & 3.81-82p2), Great Shefford Obs. (Dec. 3.81p2), and Farra d'Isonzo Obs. (Dec. 3.86-87p2).

MPEC 2008-X32 - "15:24 UT" - 2008 XS

K08X00S 2008 XS (small asteroid, Earth MOID=6.6 LD, H=27.0 ~13m) was discovered at 0610 UT on 2 Dec. by LINEAR, which observed it at Dec. 2.26-31p5. The discovery was confirmed by the Mt. Lemmon Survey (MLS) (Dec. 3.32-33p3 & 3.38-39p3). This object is now within ten lunar distances (LD) of Earth, reaching 6.8 LD on 30 Nov.

MPEC 2008-X31 - "15:21 UT" - 2008 XP

K08X00P 2008 XP (H=21.4 ~178m) was discovered at 0650 UT on 1 Dec. by the Spacewatch 0.9m telescope, which observed it at Dec. 1.29-32p3. The discovery was confirmed by the Spacewatch 1.8m telescope (Dec. 1.40-41p3 & 2.29-30p3).

MPEC 2008-X30 - "13:41 UT" - 2008 XO

K08X00O 2008 XO (risk-listed, H=23.8 ~59m) was discovered at 1003 UT on 2 Dec. by MLS, which observed it at Dec. 2.42-43p3 and 3.29-31p4. The discovery was confirmed by CSS (Dec. 3.37-39p3).

MPEC 2008-X29 - "13:38 UT" - 2008 XN

K08X00N 2008 XN (risk-listed, H=20.8 ~234m) was discovered at 0838 UT on 2 Dec. by MLS, which observed it at Dec. 2.36-43p8 and 3.29-31p4.

MPEC 2008-X28 - "13:36 UT" - 2008 XM

K08X00M 2008 XM (q=0.111 AU, Earth MOID=1.9 LD, H=19.6 ~407m) was discovered at 0307 UT on 2 Dec. by LINEAR, which observed it at Dec. 2.13-18p5. The discovery was confirmed by MLS (Dec. 3.23-25p4) and Grove Creek Obs. (Dec. 3.48-50p3).

<< DOU on 3 Dec. '08 >> MPEC 2008-X27 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K08W96J 2008 WJ96 (small asteroid, arc=2 days, H=25.5 ~27m) from Spacewatch 1.8m (Dec. 2.44-45p3)
K08W96H 2008 WH96 (small asteroid, arc=2 days, H=23.2 ~78m) from Spacewatch 1.8m (Dec. 2.43-44p3)
K08W94Y 2008 WY94 (small asteroid, arc=3 days, H=25.6 ~26m) from CSS (Dec. 2.10-12p4) and the Siding Spring Survey (SSS) (Dec. 2.43p1)
K08W13Z 2008 WZ13 (arc=12 days, H=18.7 ~616m) from Spacewatch 1.8m (Dec. 2.39-40p3)
Observations of recently (no longer) risk-listed objects
K08W64M 2008 WM64 (arc=8 days, H=20.5 ~269m) from Spacewatch 1.8m (Dec. 2.51-52p3)
K08W63Q 2008 WQ63 (arc=10 days, H=20.0 ~339m) from Spacewatch 1.8m (Dec. 2.49-50p3)
K08W61L 2008 WL61 (arc=7 days, H=19.5 ~426m) from Astronomical Research Obs. (ARO) (Nov. 28.07-09p3)
K08W59B 2008 WB59 (arc=9 days, H=19.4 ~446m) from Petit Jean Mtn. South Obs. (PJMSO) (Dec. 2.43-44p6)
K08W32Y 2008 WY32 (small asteroid, arc=8 days, H=22.3 ~117m) from ARO (Nov. 28.09-10p2)
K08W32K 2008 WK32 (arc=11 days, H=19.4 ~446m) from LINEAR (Dec. 2.21-25p4)
K08W13Y 2008 WY13 (Q=4.185 AU, arc=12 days, H=21.6 ~162m) from Spacewatch 1.8m (Dec. 2.37-39p3 at V=22.5-7)
K08W00L 2008 WL (almost small, Q=4.485 AU, arc=14 days, H=21.8 ~148m) from Desert Moon Obs. (Dec. 2.33-35p3)
K08V14H 2008 VH14 (small asteroid, Q=4.708 AU, arc=24 days, H=23.5 ~68m) from PJMSO (Dec. 2.31-33p6)
K08V01B 2008 VB1 (arc=28 days, H=20.6 ~257m) from MLS (Dec. 1.29-31p4)
K08V00E 2008 VE (small asteroid, Q=4.409 AU, arc=31 days, H=22.2 ~123m) from MLS (Dec. 2.36-38p4)
Observations of small asteroids (H>22.0)
K08W61M 2008 WM61 (arc=5 days, H=26.7 ~15m) from Faulkes Telescope South (Nov. 29.54-58p7)
K08W14G 2008 WG14 (arc=11 days, H=24.8 ~37m) from ARO (Nov. 28.09-10p4), Spacewatch 0.9m (Nov. 30.16p1), and PJMSO (Dec. 2.30-31p9)
K08W00K 2008 WK (arc=14 days, H=23.2 ~78m) from PJMSO (Dec. 2.36p7)
Observations of other objects
K08W61K 2008 WK61 (arc=11 days, H=20.6 ~257m) from PJMSO (Dec. 2.40-41p7)
K08W60L 2008 WL60 (arc=9 days, H=18.1 ~812m) from PJMSO (Dec. 2.42-43p6)
K08W60H 2008 WH60 (arc=7 days, H=20.8 ~234m) from ARO (Nov. 28.07-08p3)
K08W02N 2008 WN2 (arc=39 days, H=20.8 ~234m) from PJMSO (Dec. 2.29-30p6)
K08W00B 2008 WB (i=44.3°, arc=15 days, H=21.2 ~195m) from Spacewatch 1.8m (Dec. 2.31-32p2)
K08V14K 2008 VK14 (arc=24 days, H=19.2 ~490m) from Hamamatsu-Yuto Obs. (Dec. 2.78-80p4)
K08V04U 2008 VU4 (Q=4.213 AU, arc=25 days, H=17.5 ~1.07 km) from Hamamatsu-Yuto Obs. (Dec. 2.66-70p7)
K08V00F 2008 VF (arc=31 days, H=19.5 ~426m) from LINEAR (Dec. 2.25-30p4)
K08U95C 2008 UC95 (arc=34 days, H=18.4 ~708m) from LINEAR (Dec. 2.39-44p4) and PJMSO (Dec. 2.39p6)
K08U94Z 2008 UZ94 (arc=35 days, H=17.7 ~977m) from CSS (Dec. 2.06-08p3)
K08U90L 2008 UL90 (IEO, Q=0.959 AU, arc=37 days, H=18.5 ~676m) from CSS (Dec. 2.51-52p3)
K08U07E 2008 UE7 (arc=37 days, H=20.4 ~282m) from Lulin Minor Bodies Tracking (LIMIT) (Dec. 1.66-77p19), PJMSO (Dec. 2.41-42p6), and Hamamatsu-Yuto Obs. (Dec. 2.75-77p8)
K08S82J 2008 SJ82 (arc=67 days, H=20.6 ~257m) from Spacewatch 1.8m (Dec. 2.36p3)
K08S07P 2008 SP7 (Q=4.200 AU, arc=70 days, H=18.9 ~562m) from Jarnac Obs. (Dec. 2.14-18p3)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.4 ~708m) from Hamamatsu-Yuto Obs. (Dec. 2.47-51p10)
K08S01O 2008 SO1 (Q=4.611 AU, arc=71 days, H=19.7 ~389m) from Desert Moon Obs. (Dec. 2.39-41p2)
K08R98G 2008 RG98 (arc=84 days, H=17.2 ~1.23 km) from CSS (Dec. 2.13-14p4)
K08R26T 2008 RT26 (arc=86 days, H=19.4 ~446m) from PJMSO (Dec. 2.37-39p5)
K08P03L 2008 PL3 (arc=120 days, H=19.3 ~467m) from MLS (Dec. 2.19-21p4)
K08M00Z 2008 MZ (Q=4.207 AU, arc=170 days, H=18.6 ~645m) from LINEAR (Dec. 2.26-31p5), Spacewatch 0.9m (Dec. 2.28-31p3), CSS (Dec. 2.28-29p3), PJMSO (Dec. 2.34p6), Hamamatsu-Yuto Obs. (Dec. 2.71-73p3), and Naef Obs. (Dec. 2.90-91p2)
K08L08W 2008 LW8 (arc=3 opp, H=17.4 ~1.12 km) from CSS (Dec. 2.43-45p5)
K07E88M 2007 EM88 (arc=2 opp, H=19.4 ~446m) from Spacewatch 1.8m (Dec. 2.53p3)
K06V14B 2006 VB14 (arc=2 opp, H=18.6 ~645m) from Hamamatsu-Yuto Obs. (Dec. 2.83-85p11)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.3 ~1.17 km) from PJMSO (Dec. 2.33-34p5), CSS (Dec. 2.34-36p4), and Hamamatsu-Yuto Obs. (Dec. 2.64-66p10)
K06O05B 2006 OB5 (arc=3 opp, H=20.1 ~323m) from Spacewatch 0.9m (Dec. 2.33-36p3)
K05W01D 2005 WD1 (i=43.1°, arc=3 opp, H=16.7 ~1.55 km) from CSS (Dec. 1.19-21p4)
K05V17Y 2005 VY17 (arc=3 opp, H=17.3 ~1.17 km) from CSS (Dec. 2.51-53p4)
K05T51Z 2005 TZ51 (arc=3 opp, H=17.9 ~891m) from Hamamatsu-Yuto Obs. (Dec. 2.43-46p5)
K03WF8D 2003 WD158 (arc=4 opp, H=18.9 ~562m) from CSS (Dec. 2.23-25p4)
K01XP4N 2001 XN254 (arc=4 opp, H=17.6 ~1.02 km) from LINEAR (Dec. 2.26-31p5)
K01W25A 2001 WA25 (arc=4 opp, H=18.6 ~645m) from PJMSO (Dec. 2.40p5)
K01L05M 2001 LM5 (arc=3 opp, H=19.3 ~467m) from Hamamatsu-Yuto Obs. (Dec. 2.57-59p4)
J99J08O 1999 JO8 (Q=4.167 AU, arc=4 opp, H=16.9 ~1.41 km) from MLS (Dec. 2.34-36p4)
J9801 199801 2007 AE12 from Naef Obs. (Dec. 2.90-93p3)
J4386 194386 2001 VG5 from LINEAR (Dec. 2.25-30p5)
J4268 194268 2001 UY4 from CSS (Dec. 1.22-25p4)
J0166 190166 2005 UP156 from Spacewatch 0.9m (Nov. 30.08-11p3)
I9058 189058 2000 UT16 from CSS (Dec. 1.12-14p4)
H1576 171576 1999 VP11 from CSS (Dec. 2.23-25p4)
G3373 163373 2002 PZ39 from Spacewatch 0.9m (Nov. 30.19-21p2)
F4715 154715 2004 LB6 from LINEAR (Dec. 2.37-40p4) and CSS (Dec. 2.50-51p3)
F3306 153306 2001 JL1 from CSS (Dec. 1.32-34p4)
F3220 153220 2000 YN29 from Spacewatch 0.9m (Nov. 30.31-33p2)
F2742 152742 1998 XE12 from Naef Obs. (Dec. 2.93-98p3)
D7925 137925 2000 BJ19 from Spacewatch 0.9m (Dec. 2.50-52p3)
D7032 137032 1998 UO1 from CSS (Dec. 2.16-18p4)
D6849 136849 1998 CS1 from Naef Obs. (Dec. 3.00-02p2)
90075 90075 2002 VU94 from LINEAR (Dec. 2.20-24p3)
89355 89355 2001 VS78 from CSS (Dec. 2.36-39p5)
87684 87684 2000 SY2 from CSS (Dec. 2.10-12p4)
87024 87024 2000 JS66 from CSS (Dec. 2.48p2)
54071 54071 2000 GQ146 from MLS (Dec. 2.13-21p7)
53319 53319 1999 JM8 from LINEAR (Dec. 2.12-17p5)
42286 42286 2001 TN41 from CSS (Dec. 2.53-54p4)
19356 19356 1997 GH3 from CSS (Dec. 1.53-54p4)
18882 18882 1999 YN4 from LINEAR (Dec. 2.44-49p5)
18109 18109 2000 NG11 from Spacewatch 0.9m (Dec. 1.51-53p3)
16834 16834 1997 WU22 from CSS (Dec. 1.39-42p4)
10563 10563 Izhdubar (1993 WD) from SSS (Dec. 2.54-56p4)
08567 8567 1996 HW1 from LINEAR (Dec. 2.13-17p5) and CSS (Dec. 2.23-25p4)
07358 7358 Oze (1995 YA3) from Naef Obs. (Dec. 2.95p1 & 2.00p1)
07335 7335 1989 JA from Spacewatch 0.9m (Dec. 2.18-20p3) and LINEAR (Dec. 2.28-30p3)
05332 5332 1990 DA from SSS (Dec. 2.54-56p4)
05011 5011 Ptah (6743 P-L) from LINEAR (Dec. 2.06-11p5)
04183 4183 Cuno (1959 LM) from MLS (Dec. 2.13-15p4)
03360 3360 Syrinx (1981 VA) from CSS (Dec. 2.13-15p3)
02368 2368 Beltrovata (1977 RA) from LINEAR (Dec. 2.38-43p5) and Naef Obs. (Dec. 2.94-99p4)
01627 1627 Ivar (1929 SH) from CSS (Dec. 1.25-28p4)

MPEC 2008-X26 - "04:34 UT" - 2005 QU182

K05QI2U 2005 QU182 (q=36.957 AU, Q=187.785 AU, H=3.2 ~776 km) from NEAT's Mt. Palomar telescope (2006 Sept. 16.32p1, 2006 Sept. 16.37p1 & 2006 Sept. 16.41p1) and Kitt Peak Natl. Obs. (KPNO) (Oct. 23.34p1, 23.40p1, 24.23p1 & 24.31p1)

Observers on 3 December '08

A total of 21 observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 4 in MPEC 2008-X27 -- 2008 WY32, 2008 WL61, 2008 WH60, 2008 WG14
`A74`	Bergen-Enkheim Obs. in Germany, 1 in MPEC 2008-X34 -- 2008 XC1
`703`	Catalina Sky Survey (CSS) in Arizona, 28 in MPECs 2008-X27, 2008-X30, 2008-X33 & 2008-X34 -- 2008 XO, 2008 XC1, 2008 XB1, 2008 WY94, 2008 UZ94, 2008 UL90, 2008 RG98, 2008 MZ, 2008 LW8, 2006 SZ217, 2005 WD1, 2005 VY17, 2003 WD158, 89355, 87684, 87024, 42286, 194268, 19356, 189058, 171576, 16834, 154715, 153306, 137032, 8567, 3360, 1627
`448`	Desert Moon Obs. in New Mexico, 2 in MPEC 2008-X27 -- 2008 WL, 2008 SO1
`595`	Farra d'Isonzo Obs. in Italy, 1 in MPEC 2008-X33 -- 2008 XB1
`E10`	Faulkes Telescope South in New South Wales, 1 in MPEC 2008-X27 -- 2008 WM61
`J95`	Great Shefford Obs. in England, 1 in MPEC 2008-X33 -- 2008 XB1
`E16`	Grove Creek Obs. in New South Wales, 1 in MPEC 2008-X28 -- 2008 XM
`379`	Hamamatsu-Yuto Obs. in Japan, 9 in MPEC 2008-X27 -- 2008 VU4, 2008 VK14, 2008 UE7, 2008 SQ1, 2008 MZ, 2006 VB14, 2006 SZ217, 2005 TZ51, 2001 LM5
`G92`	Jarnac Obs. in Arizona, 1 in MPEC 2008-X27 -- 2008 SP7
`695`	Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2008-X26 -- 2005 QU182
`704`	LINEAR in New Mexico, 16 in MPECs 2008-X27, 2008-X28 & 2008-X32 -- 2008 XS, 2008 XM, 2008 WK32, 2008 VF, 2008 UC95, 2008 MZ, 2001 XN254, 90075, 53319, 194386, 18882, 154715, 8567, 7335, 5011, 2368
`D35`	Lulin Minor Bodies Tracking in Taiwan, 1 in MPEC 2008-X27 -- 2008 UE7
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 10 in MPECs 2008-X27, 2008-X28, 2008-X29, 2008-X30 & 2008-X32 -- 2008 XS, 2008 XO, 2008 XN, 2008 XM, 2008 VE, 2008 VB1, 2008 PL3, 1999 JO8, 54071, 4183
`644`	NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2008-X26 -- 2005 QU182
`A13`	Naef Obs. in Switzerland, 6 in MPEC 2008-X27 -- 2008 MZ, 199801, 152742, 136849, 7358, 2368
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 13 in MPEC 2008-X27 -- 2008 WN2, 2008 WL60, 2008 WK61, 2008 WK, 2008 WG14, 2008 WB59, 2008 VH14, 2008 UE7, 2008 UC95, 2008 RT26, 2008 MZ, 2006 SZ217, 2001 WA25
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2008-X33 -- 2008 XB1
`E12`	Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2008-X27 -- 2008 WY94, 10563, 5332
`691`	Spacewatch 0.9m telescope in Arizona, 10 in MPECs 2008-X27 & 2008-X31 -- 2008 XP, 2008 WG14, 2008 MZ, 2006 OB5, 190166, 18109, 163373, 153220, 137925, 7335
`291`	Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2008-X27 & 2008-X31 -- 2008 XP, 2008 WZ13, 2008 WY13, 2008 WQ63, 2008 WM64, 2008 WJ96, 2008 WH96, 2008 WB, 2008 SJ82, 2007 EM88

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

Impact Risk Monitoring on 3 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 XO	JPL Sentry	1658	2024-2098	5	2.9e-09	-7.75	-8.06	0	JPL: "Analysis based on 10 observations spanning .97092 days (2008-Dec-02.41885 to 2008-Dec-03.38977)." Diameter approximately 0.067 km. from mean, weighted H=23.5.

2008 XN	JPL Sentry	1658	2010-2105	50	2.0e-07	-3.41	-3.47	0	JPL: "Analysis based on 12 observations spanning .95260 days (2008-Dec-02.36013 to 2008-Dec-03.31273)." Diameter approximately 0.341 km. from mean, weighted H=20.0.

2008 XK	NEODyS	1601	2034-2085	18	6.25e-08	-8.33	-8.80	0	NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/02.281 to 2008/12/02.368."

2008 WJ96	JPL Sentry	1503	R E M O V E D						JPL: Risk listing removed at 0952 UTC.
2008 WJ96	NEODyS	1503	R E M O V E D						-

2008 WH96	JPL Sentry	1503	R E M O V E D						JPL: Risk listing removed at 0953 UTC.
2008 WH96	NEODyS	1503	R E M O V E D						-

2008 WY94	JPL Sentry	1503	2045-2074	11	1.5e-05	-5.39	-5.50	0	JPL: "Analysis based on 21 observations spanning 2.8848 days (2008-Nov-29.54021 to 2008-Dec-02.42502)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
2008 WY94	NEODyS	1503	2061-2089	25	1.99e-05	-5.27	-5.36	0	NEODyS: "Based on 22 optical observations (of which 1 are rejected as outliers) from 2008/11/29.541 to 2008/12/02.426."

2008 WZ13	JPL Sentry	1503	2037-2106	22	1.1e-06	-2.85	-3.14	0	JPL: "Analysis based on 50 observations spanning 12.127 days (2008-Nov-20.27557 to 2008-Dec-02.40258)." Diameter approximately 0.600 km. from mean, weighted H=18.8.
2008 WZ13	NEODyS	1503	2037-2090	13	1.05e-06	-2.83	-3.11	0	NEODyS: "Based on 50 optical observations (of which 0 are rejected as outliers) from 2008/11/20.276 to 2008/12/02.403."

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 3 December '08

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

2358	Grabbed MPEC 2008-X33 - 2008 XB1 - see above Grabbed MPEC 2008-X34 - 2008 XC1 - see above
1658	Noted that JPL Sentry has posted 2008 XN as an impact risk - see above Noted that JPL Sentry has posted 2008 XO as an impact risk - see above
1600	Noted that NEODyS has posted 2008 XK as an impact risk - see above Grabbed MPEC 2008-X31 - 2008 XP - see above Grabbed MPEC 2008-X32 - 2008 XS - see above
1503	Noted that JPL Sentry has removed 2008 WH96 as an impact risk - see above Noted that NEODyS has removed 2008 WH96 as an impact risk - see above Noted that JPL Sentry has removed 2008 WJ96 as an impact risk - see above Noted that NEODyS has removed 2008 WJ96 as an impact risk - 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 updated its 2008 WZ13 risk assessment - see above Noted that NEODyS has updated its 2008 WZ13 risk assessment - see above Grabbed MPEC 2008-X27 - Daily Orbit Update - see above Grabbed MPEC 2008-X28 - 2008 XM - see above Grabbed MPEC 2008-X29 - 2008 XN - see above Grabbed MPEC 2008-X30 - 2008 XO - see above
0602	Grabbed MPEC 2008-X26 - 2005 QU182 - see above

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