2008-11-25 Tracking News

Contents on 25 November '08

IAU Minor Planet Center
- NEOCP Activity -- three listings: 1 new, 2 updated
- New MPECs -- eight MPECs
Observers -- 27 observing facilities
Impact Risk Monitoring -- six 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 25 November '08

The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and two updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of nineteen 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 25 November '08

Minor Planet Electronic Circulars

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

MPEC 2008-W62 time-stamped "07:09 UT" - Daily Orbit Update - see below
MPEC 2008-W63 time-stamped "14:20 UT" - 2007 FE20 - see below
MPEC 2008-W64 time-stamped "16:42 UT" - 2008 WK61 - see below
MPEC 2008-W65 time-stamped "16:49 UT" - 2008 WL61 - see below
MPEC 2008-W66 time-stamped "16:57 UT" - 2008 WM61 - see below
MPEC 2008-W67 time-stamped "17:35 UT" - 2001 VR78 - see below
MPEC 2008-W68 time-stamped "22:06 UT" - 2008 WS62 - see below
MPEC 2008-W69 time-stamped "22:09 UT" - 2008 WT62

MPEC 2008-W69 - "22:09 UT" - 2008 WT62

K08W62T 2008 WT62 (small asteroid, H=22.7 ~98m) was discovered at 0510 UT on 24 Nov. by the Mt. Lemmon Survey (MLS), which observed it at Nov. 24.22-26p7. The discovery was confirmed by Grasslands Obs. (Nov. 24.27-28p2), Magdalena Ridge Obs. (MRO) (Nov. 24.28-29p6), and Astronomical Research Obs. (ARO) (Nov. 25.16-17p2).

MPEC 2008-W68 - "22:06 UT" - 2008 WS62

K08W62S 2008 WS62 (small asteroid, Earth MOID=6.1 LD, H=25.0 ~34m) was discovered at 0455 UT on 24 Nov. by MLS, which observed it at Nov. 24.21-26p8. The discovery was confirmed by MRO (Nov. 24.25-26p4), Grasslands Obs. (Nov. 24.26-27p3), and ARO (Nov. 25.16-18p3).

MPEC 2008-W67 - "17:35 UT" - 2001 VR78

K01V78R 2001 VR78 (i=56.1°, q=1.690 AU, H=15.9 ~2.24 km) from the Spacewatch 0.9m telescope (1998 Nov. 15.37-41p3), the Catalina Sky Survey (CSS) (Nov. 24.38-40p4), the Siding Spring Survey (SSS) (Nov. 24.59p1), Great Shefford Obs. (Nov. 25.01p1 & 25.06p1), and Sandlot Obs. (Nov. 25.37-39p3)

MPEC 2008-W66 - "16:57 UT" - 2008 WM61

K08W61M 2008 WM61 (small asteroid, Earth MOID=3.5 LD, H=26.8 ~15m) was discovered at 0454 UT on 24 Nov. by LINEAR, which observed it at Nov. 24.20-24p4. The discovery was confirmed by Great Shefford Obs. (Nov. 24.85-86p3), Winer Obs. (Nov. 25.18-19p3), and ARO (Nov. 25.19p3). This object is now within ten lunar distances (LD) of Earth, reaching 3.5 LD on 28 Nov.

MPEC 2008-W65 - "16:49 UT" - 2008 WL61

K08W61L 2008 WL61 (risk-listed, H=19.4 ~446m) was discovered at 0317 UT on 24 Nov. by MLS, which observed it at Nov. 24.14-23p8. The discovery was confirmed by MRO (Nov. 24.19-21p4), Grasslands Obs. (Nov. 24.20-21p3), and Great Shefford Obs. (Nov. 24.89-90p3).

MPEC 2008-W64 - "16:42 UT" - 2008 WK61

K08W61K 2008 WK61 (Earth MOID=8.3 LD, H=20.4 ~282m) was discovered at 0922 UT on 21 Nov. by LINEAR, which observed it at Nov. 21.39-44p5 and 24.44-49p8. The discovery was confirmed by Great Shefford Obs. (Nov. 24.98-00p5) and Sandlot Obs. (Nov. 25.41p3).

MPEC 2008-W63 - "14:20 UT" - 2007 FE20

K07F20E 2007 FE20 (H=19.8 ~371m) from David Tholen's team on Mauna Kea (Nov. 20.49p4 at R=22.0-22.1 & 21.56p3 at R=22.0-22.3)

<< DOU on 25 Nov. '08 >> MPEC 2008-W62 - "07:09 UT" - Daily Orbit Update

Observations of risk-listed objects
K08W59B 2008 WB59 (arc=2 days, H=19.1 ~513m) from Kline Obs. (Nov. 24.31-33p3) and Great Shefford Obs. (Nov. 25.13-14p3)
K08W32W 2008 WW32 (arc=3 days, H=21.3 ~186m) from ARO (Nov. 24.03-05p3)
K08W13Z 2008 WZ13 (arc=4 days, H=18.4 ~708m) from the Spacewatch 1.8m telescope (Nov. 24.30p2)
K08W13Y 2008 WY13 (Q=4.895 AU, arc=4 days, H=21.5 ~170m) from Spacewatch 1.8m (Nov. 24.25-26p3)
K08U99W 2008 UW99 (small asteroid, arc=24 days, H=24.7 ~39m) from Spacewatch 1.8m (Nov. 24.45p2)
E4898 144898 2004 VD17 from Tholen et al. (Nov. 20.55-56p4)
Observations of recently (no longer) risk-listed objects
K08W32X 2008 WX32 (arc=3 days, H=18.9 ~562m) from Spacewatch 1.8m (Nov. 24.24p3)
K08W32K 2008 WK32 (arc=4 days, H=19.6 ~407m) from Spacewatch 1.8m (Nov. 24.32p3) and Nazaret Obs. (Nov. 24.94-95p3)
K08W14A 2008 WA14 (small asteroid, arc=4 days, H=23.0 ~85m) from ARO (Nov. 24.07-08p3)
K08W01P 2008 WP1 (arc=5 days, H=20.3 ~295m) from ARO (Nov. 24.05-06p3)
K08W00L 2008 WL (almost small, Q=4.578 AU, arc=5 days, H=21.8 ~148m) from ARO (Nov. 23.29p4)
K08W00C 2008 WC (small asteroid, arc=7 days, H=26.4 ~18m) from ARO (Nov. 23.11-12p6), LINEAR (Nov. 23.26-31p5 & 24.25-30p5), and Great Shefford Obs. (Nov. 25.06-07p3)
K08V14H 2008 VH14 (small asteroid, Q=4.711 AU, arc=16 days, H=23.3 ~74m) from Desert Moon Obs. (Nov. 24.33-35p3)
K08V01B 2008 VB1 (arc=21 days, H=20.6 ~257m) from Desert Moon Obs. (Nov. 24.26-30p3) and Spacewatch 1.8m (Nov. 24.36-37p3)
K08U94Z 2008 UZ94 (arc=27 days, H=17.6 ~1.02 km) from Lumezzane Obs. (Nov. 23.75p4) and ARO (Nov. 24.03-04p6)
K08U07E 2008 UE7 (arc=30 days, H=20.5 ~269m) from ARO (Nov. 23.29-30p4), Santa Maria de Montmagastrell Obs. (Nov. 23.91-92p3), LINEAR (Nov. 24.25-30p5), Mirasteilas Obs. (Nov. 24.86-88p3), and Thompsonville Obs. (Nov. 25.12-13p6)
K04X03K 2004 XK3 (small asteroid, arc=2 opp, H=24.3 ~47m) from ARO (Nov. 23.12-13p4)
Observations of small asteroids (H>22.0)
K08W60K 2008 WK60 (arc=1 day, H=22.5 ~107m) from SSS (Nov. 24.62p3)
K08W14G 2008 WG14 (arc=3 days, H=24.6 ~41m) from ARO (Nov. 23.10-11p4 & 24.08p3)
K08W14F 2008 WF14 (arc=3 days, H=24.9 ~35m) from Spacewatch 1.8m (Nov. 24.38p3)
K08W14B 2008 WB14 (arc=4 days, H=25.5 ~27m) from ARO (Nov. 24.09-10p3)
K08W00D 2008 WD (arc=7 days, H=25.9 ~22m) from Great Shefford Obs. (Nov. 25.11-12p2, 25.16p1 & 25.22p1)
K08V15A 2008 VA15 (arc=15 days, H=23.5 ~68m) from ARO (Nov. 23.38-39p3)
K08V03U 2008 VU3 (Q=4.027 AU, arc=21 days, H=23.3 ~74m) from ARO (Nov. 23.25-27p3)
K06U00P 2006 UP (arc=3 opp, H=22.9 ~89m) from Spacewatch 0.9m (Nov. 21.26-28p2)
Observations of other objects
K08W60H 2008 WH60 (arc=1 day, H=20.6 ~257m) from LINEAR (Nov. 24.13-18p5)
K08W32M 2008 WM32 (i=39.1°, arc=4 days, H=19.7 ~389m) from ARO (Nov. 23.30p5) and Great Shefford Obs. (Nov. 25.15-16p3)
K08W14C 2008 WC14 (Q=5.312 AU, arc=4 days, H=20.0 ~339m) from ARO (Nov. 23.37-38p5) and Desert Moon Obs. (Nov. 24.51-52p2)
K08W02N 2008 WN2 (arc=31 days, H=20.7 ~245m) from Spacewatch 1.8m (Nov. 24.46-47p3)
K08W01Q 2008 WQ1 (arc=5 days, H=21.1 ~204m) from ARO (Nov. 24.05p1)
K08W00N 2008 WN (arc=4 days, H=18.5 ~676m) from ARO (Nov. 23.22-23p4)
K08W00B 2008 WB (i=44.2°, arc=7 days, H=21.0 ~214m) from ARO (Nov. 24.06-07p3)
K08V14K 2008 VK14 (arc=15 days, H=19.1 ~513m) from ARO (Nov. 23.30-31p6)
K08V00N 2008 VN (Q=5.011 AU, arc=2 opp, H=16.8 ~1.48 km) from ARO (Nov. 23.28-29p3)
K08V00F 2008 VF (arc=22 days, H=19.6 ~407m) from ARO (Nov. 23.23-24p5)
K08U95C 2008 UC95 (arc=26 days, H=18.4 ~708m) from LINEAR (Nov. 24.39-44p5)
K08U90O 2008 UO90 (arc=28 days, H=20.5 ~269m) from Spacewatch 0.9m (Nov. 21.12-15p3) and Spacewatch 1.8m (Nov. 24.27p3)
K08U90L 2008 UL90 (IEO, Q=0.959 AU, arc=30 days, H=18.4 ~708m) from ARO (Nov. 23.47-48p3), Desert Moon Obs. (Nov. 24.47-49p2), and Great Shefford Obs. (Nov. 25.22-23p2)
K08S07V 2008 SV7 (arc=60 days, H=21.6 ~162m) from ARO (Nov. 23.30-31p3)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.4 ~708m) from San Benedetto Po Obs. (Nov. 19.81-82p5)
K08S00E 2008 SE (arc=64 days, H=19.4 ~446m) from Santa Maria de M. Obs. (Nov. 23.86-87p3)
K08R26T 2008 RT26 (arc=77 days, H=19.4 ~446m) from ARO (Nov. 23.32-33p4)
K08R24Q 2008 RQ24 (arc=80 days, H=20.8 ~234m) from ARO (Nov. 24.08-10p2)
K08R00T 2008 RT (arc=83 days, H=19.8 ~371m) from ARO (Nov. 23.41-42p3)
K08M05B 2008 MB5 (arc=147 days, H=19.0 ~537m) from Desert Moon Obs. (Nov. 24.41-43p2)
K08M00Z 2008 MZ (Q=4.207 AU, arc=162 days, H=18.6 ~645m) from LINEAR (Nov. 24.31-37p5)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.3 ~1.17 km) from Tradate Obs. (Nov. 24.94-95p2) and Thompsonville Obs. (Nov. 25.15p6)
K06SL7X 2006 SX217 (arc=3 opp, H=18.7 ~616m) from ARO (Nov. 23.43-44p2)
K05W55S 2005 WS55 (arc=4 opp, H=16.1 ~2.04 km, q=1.108 AU) from Ametlla del Valles Obs. (Nov. 16.81p2)
K05T51Z 2005 TZ51 (arc=3 opp, H=17.9 ~891m) from Montana Blanca Obs. (Nov. 22.81-82p3) and LINEAR (Nov. 24.24-29p5)
K05N07D 2005 ND7 (i=52.6°, arc=2 opp, H=17.8 ~933m) from MLS (Nov. 24.45-47p4)
K03Y01X 2003 YX1 (arc=2 opp, H=20.9 ~224m) from MLS (Nov. 24.49-51p4)
K03U08D 2003 UD8 (Q=4.175 AU, arc=5 opp, H=16.7 ~1.55 km) from ARO (Nov. 23.34-36p4)
K03G00Y 2003 GY (arc=4 opp, H=20.1 ~323m) from Spacewatch 1.8m (Nov. 24.43-44p3)
K02N16W 2002 NW16 (arc=2 opp, H=18.0 ~851m) from ARO (Nov. 23.48-49p3)
K01XP4N 2001 XN254 (arc=4 opp, H=17.6 ~1.02 km) from LINEAR (Nov. 24.32-34p3)
J95M01A 1995 MA1 (Q=4.144 AU, arc=5 opp, H=17.6 ~1.02 km) from MLS (Nov. 24.31-32p4)
J94U00G 1994 UG (arc=3 opp, H=21.0 ~214m) from Spacewatch 1.8m (Nov. 24.51-52p3 at V=21.5-22.3)
J94A01W 1994 AW1 (arc=3 opp, H=17.6 ~1.02 km) from Lumezzane Obs. (Nov. 23.76p4) and Ametlla del Valles Obs. (Nov. 24.82-87p4)
J9801 199801 2007 AE12 from LINEAR (Nov. 24.32-37p5)
J4386 194386 2001 VG5 from La Sagra Obs. (Nov. 22.95-97p3)
G3373 163373 2002 PZ39 from Spacewatch 0.9m (Nov. 21.26p1)
G2900 162900 2001 HG31 from San Benedetto Po Obs. (Nov. 19.83p4)
G2679 162679 2000 TK1 from Crni Vrh Obs. (Nov. 23.72-75p4)
E4901 144901 2004 WG1 from LINEAR (Nov. 24.19-24p5)
E4900 144900 2004 VG64 from CSS (Nov. 24.32-33p4)
D8852 138852 2000 WN10 from Tradate Obs. (Nov. 24.91-92p2)
D7032 137032 1998 UO1 from Ametlla del Valles Obs. (Nov. 16.78-79p3)
96315 96315 1997 AP10 from MLS (Nov. 24.36-38p4)
85236 85236 1993 KH from Lumezzane Obs. (Nov. 23.77-78p4) and Thompsonville Obs. (Nov. 25.07-08p6)
68031 68031 2000 YK29 from CSS (Nov. 24.27-29p4)
53430 53430 1999 TY16 from Tradate Obs. (Nov. 24.86-90p3) and Thompsonville Obs. (Nov. 25.13-14p6)
36236 36236 1999 VV from Lumezzane Obs. (Nov. 23.77p4) and Ametlla del Valles Obs. (Nov. 23.87-92p6)
22099 22099 2000 EX106 from SSS (Nov. 24.73-74p4)
19356 19356 1997 GH3 from LINEAR (Nov. 24.48-50p3)
13651 13651 1997 BR from Jarnac Obs. (Nov. 24.29-32p3)
07358 7358 Oze (1995 YA3) from LINEAR (Nov. 24.38-43p5)
05011 5011 Ptah (6743 P-L) from LINEAR (Nov. 24.06-12p5)
03360 3360 Syrinx (1981 VA) from Thompsonville Obs. (Nov. 25.06-07p6)
02368 2368 Beltrovata (1977 RA) from MLS (Nov. 24.36-38p4)

Observers on 25 November '08

A total of 27 observing facilities appear in today's MPECs.

Code	Observer / observatory
`B37`	Ametlla del Valles Obs. in Spain, 4 in MPEC 2008-W62 -- 2005 WS55, 1994 AW1, 36236, 137032
`H55`	Astronomical Research Obs. (ARO) in Illinois, 31 in MPECs 2008-W62, 2008-W66, 2008-W68 & 2008-W69 -- 2008 WW32, 2008 WT62, 2008 WS62, 2008 WQ1, 2008 WP1, 2008 WN, 2008 WM61, 2008 WM32, 2008 WL, 2008 WG14, 2008 WC14, 2008 WC, 2008 WB14, 2008 WB, 2008 WA14, 2008 VU3, 2008 VN, 2008 VK14, 2008 VF, 2008 VA15, 2008 UZ94, 2008 UL90, 2008 UE7, 2008 SV7, 2008 RT26, 2008 RT, 2008 RQ24, 2006 SX217, 2004 XK3, 2003 UD8, 2002 NW16
`703`	Catalina Sky Survey (CSS) in Arizona, 3 in MPECs 2008-W62 & 2008-W67 -- 2001 VR78, 68031, 144900
`106`	Crni Vrh Obs. in Slovenia, 1 in MPEC 2008-W62 -- 162679
`448`	Desert Moon Obs. in New Mexico, 5 in MPEC 2008-W62 -- 2008 WC14, 2008 VH14, 2008 VB1, 2008 UL90, 2008 MB5
`651`	Grasslands Obs. in Arizona, 3 in MPECs 2008-W65, 2008-W68 & 2008-W69 -- 2008 WT62, 2008 WS62, 2008 WL61
`J95`	Great Shefford Obs. in England, 9 in MPECs 2008-W62, 2008-W64, 2008-W65, 2008-W66 & 2008-W67 -- 2008 WM61, 2008 WM32, 2008 WL61, 2008 WK61, 2008 WD, 2008 WC, 2008 WB59, 2008 UL90, 2001 VR78
`G92`	Jarnac Obs. in Arizona, 1 in MPEC 2008-W62 -- 13651
`H05`	Kline Obs. in Colorado, 1 in MPEC 2008-W62 -- 2008 WB59
`704`	LINEAR in New Mexico, 14 in MPECs 2008-W62, 2008-W64 & 2008-W66 -- 2008 WM61, 2008 WK61, 2008 WH60, 2008 WC, 2008 UE7, 2008 UC95, 2008 MZ, 2005 TZ51, 2001 XN254, 199801, 19356, 144901, 7358, 5011
`J75`	La Sagra Obs. in Spain, 1 in MPEC 2008-W62 -- 194386
`130`	Lumezzane Obs. in Italy, 4 in MPEC 2008-W62 -- 2008 UZ94, 1994 AW1, 85236, 36236
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2008-W65, 2008-W68 & 2008-W69 -- 2008 WT62, 2008 WS62, 2008 WL61
`5682`	David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2008-W62 & 2008-W63 -- 2007 FE20, 144898
`B67`	Mirasteilas Obs. in Switzerland, 1 in MPEC 2008-W62 -- 2008 UE7
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-W62 -- 2005 TZ51
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-W62, 2008-W65, 2008-W68 & 2008-W69 -- 2008 WT62, 2008 WS62, 2008 WL61, 2005 ND7, 2003 YX1, 1995 MA1, 96315, 2368
`J47`	Nazaret Obs. in Spain, 1 in MPEC 2008-W62 -- 2008 WK32
`434`	San Benedetto Po Obs. in Italy, 2 in MPEC 2008-W62 -- 2008 SQ1, 162900
`H36`	Sandlot Obs. in Kansas, 2 in MPECs 2008-W64 & 2008-W67 -- 2008 WK61, 2001 VR78
`B74`	Santa Maria de Montmagastrell Obs. in Spain, 2 in MPEC 2008-W62 -- 2008 UE7, 2008 SE
`E12`	Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2008-W62 & 2008-W67 -- 2008 WK60, 2001 VR78, 22099
`691`	Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2008-W62 & 2008-W67 -- 2008 UO90, 2006 UP, 2001 VR78, 163373
`291`	Spacewatch 1.8m telescope in Arizona, 11 in MPEC 2008-W62 -- 2008 WZ13, 2008 WY13, 2008 WX32, 2008 WN2, 2008 WK32, 2008 WF14, 2008 VB1, 2008 UW99, 2008 UO90, 2003 GY, 1994 UG
`H53`	Thompsonville Obs. in Illinois, 5 in MPEC 2008-W62 -- 2008 UE7, 2006 SZ217, 85236, 53430, 3360
`B39`	Tradate Obs. in Italy, 3 in MPEC 2008-W62 -- 2006 SZ217, 53430, 138852
`648`	Winer Obs. in Arizona, 1 in MPEC 2008-W66 -- 2008 WM61

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

Impact Risk Monitoring on 25 November '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 WL61	JPL Sentry	2034	2012-2106	25	7.6e-09	-4.73	-5.08	0	JPL: "Analysis based on 18 observations spanning .76602 days (2008-Nov-24.13737 to 2008-Nov-24.90339)." Diameter approximately 0.391 km. from mean, weighted H=19.7.

2008 WB59	JPL Sentry	1444	R E M O V E D						JPL: Risk listing removed at 1031 UTC.
2008 WB59	NEODyS	1444	R E M O V E D						-

2008 WW32	JPL Sentry	1444	2066-2105	2	1.5e-09	-6.91	-6.94	0	JPL: "Analysis based on 19 observations spanning 2.9945 days (2008-Nov-21.12895 to 2008-Nov-24.12341)." Diameter approximately 0.239 km. from mean, weighted H=20.8.
2008 WW32	NEODyS	1444	2055	1	1.06e-08	-6.11	-6.11	0	NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2008/11/21.130 to 2008/11/24.124."

2008 WZ13	JPL Sentry	1444	2023-2108	79	6.6e-07	-3.03	-3.79	0	JPL: "Analysis based on 22 observations spanning 4.0247 days (2008-Nov-20.27557 to 2008-Nov-24.30027)." Diameter approximately 0.649 km. from mean, weighted H=18.6.
2008 WZ13	NEODyS	1444	2012-2090	64	4.07e-07	-2.90	-3.28	0	NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2008/11/20.276 to 2008/11/24.301."

2008 WY13	JPL Sentry	1444	2083-2106	3	7.4e-08	-5.30	-5.33	0	JPL: "Analysis based on 26 observations spanning 3.9864 days (2008-Nov-20.27393 to 2008-Nov-24.2603)." Diameter approximately 0.170 km. from mean, weighted H=21.5.
2008 WY13	NEODyS	1444	2083	1	6.15e-08	-5.36	-5.36	0	NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2008/11/20.275 to 2008/11/24.261."

2008 UW99	JPL Sentry	1444	2093	1	1.1e-06	-6.16	-6.16	0	JPL: "Analysis based on 47 observations spanning 23.997 days (2008-Oct-31.45784 to 2008-Nov-24.45435)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

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 25 November '08

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

2225	Grabbed MPEC 2008-W68 - 2008 WS62 - see above Grabbed MPEC 2008-W69 - 2008 WT62 - see above
2034	Noted that JPL Sentry has posted 2008 WL61 as an impact risk - see above
1850	Grabbed MPEC 2008-W67 - 2001 VR78 - see above
1733	Grabbed MPEC 2008-W65 - 2008 WL61 - see above
1732	Grabbed MPEC 2008-W64 - 2008 WK61 - see above Grabbed MPEC 2008-W66 - 2008 WM61 - see above
1445	Grabbed MPEC 2008-W62 - Daily Orbit Update - see above
1444	Noted that JPL Sentry has updated its 2008 UW99 risk assessment - see above Noted that JPL Sentry has removed 2008 WB59 as an impact risk - see above Noted that NEODyS has removed 2008 WB59 as an impact risk - see above Noted that JPL Sentry has updated its 2008 WW32 risk assessment - see above Noted that NEODyS has updated its 2008 WW32 risk assessment - see above Noted that JPL Sentry has updated its 2008 WY13 risk assessment - see above Noted that NEODyS has updated its 2008 WY13 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-W63 - 2007 FE20 - see above

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