2008-10-29 Tracking News

Contents on 29 October '08

IAU Minor Planet Center
- NEOCP Activity -- eight listings: 4 new, 4 updated
- New MPECs -- ten 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 29 October '08

The MPC's NEO Confirmation Page has 8 listings: 4 new, 4 updated

When last checked at 2359 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and four updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of 20 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 29 October '08

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been ten MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-U81 time-stamped "06:14 UT" - Daily Orbit Update - see below
MPEC 2008-U82 time-stamped "14:20 UT" - 2008 UV91 - see below
MPEC 2008-U83 time-stamped "14:23 UT" - 2008 UW91 - see below
MPEC 2008-U84 time-stamped "14:31 UT" - 2008 UX91 - see below
MPEC 2008-U85 time-stamped "14:35 UT" - 2008 UY91 - see below
MPEC 2008-U86 time-stamped "14:38 UT" - 2008 UZ91 - see below
MPEC 2008-U87 time-stamped "14:42 UT" - 2008 UA92 - see below
MPEC 2008-U88 time-stamped "14:45 UT" - 2008 UB92 - see below
MPEC 2008-U89 time-stamped "14:48 UT" - 2005 VO5 - see below
MPEC 2008-U90 time-stamped "18:40 UT" - 2007 EM88

MPEC 2008-U90 - "18:40 UT" - 2007 EM88

K07E88M 2007 EM88 (H=19.3 ~467m) from Astronomical Research Obs. (ARO) (Oct. 25.43-45p3 & 29.43-45p2)

MPEC 2008-U89 - "14:48 UT" - 2005 VO5

K05V05O 2005 VO5 (H=19.7 ~389m) from the Spacewatch 1.8m telescope (Sept. 28.46p3 at V=22.3-8 & Oct. 29.47-48p3)

MPEC 2008-U88 - "14:45 UT" - 2008 UB92

K08U92B 2008 UB92 (risk-listed, Earth MOID=5.8 LD, H=24.9 ~35m) was discovered at 0829 UT on 29 Oct. by the Mt. Lemmon Survey (MLS), which observed it at Oct. 29.35-37p4 and 29.42-44p4. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Oct. 29.40-41p4). This object was within ten lunar distances (LD) of Earth, reaching 7.5 LD on 21 Oct.

MPEC 2008-U87 - "14:42 UT" - 2008 UA92

K08U92A 2008 UA92 (risk-listed, H=27.5 ~11m) was discovered at 1055 UT on 28 Oct. by MLS, which observed it at Oct. 28.41-46p12 and 29.46-47p3.

MPEC 2008-U86 - "14:38 UT" - 2008 UZ91

K08U91Z 2008 UZ91 (small asteroid, H=22.2 ~123m) was discovered at 0702 UT on 28 Oct. by MLS, which observed it at Oct. 28.29-31p4 and 28.41-42p4. The discovery was confirmed by MRO (Oct. 28.41-42p4 & 29.38-39p4) and Spacewatch 1.8m (Oct. 29.42-43p3).

MPEC 2008-U85 - "14:35 UT" - 2008 UY91

K08U91Y 2008 UY91 (risk-listed, H=24.1 ~51m) was discovered at 0517 UT on 28 Oct. by MLS, which observed it at Oct. 28.22-24p4 at V=21.3-22.0 and 28.31-32p4 at V=21.6-22.1. The discovery was confirmed by MRO (Oct. 28.33-34p5).

MPEC 2008-U84 - "14:31 UT" - 2008 UX91

K08U91X 2008 UX91 (small asteroid, H=24.0 ~54m) was discovered at 0517 UT on 28 Oct. by MLS, which observed it at Oct. 28.22-24p4 and 28.31-32p4. The discovery was confirmed by MRO (Oct. 28.38-39p4 & 29.31-32p4) and Spacewatch 1.8m (Oct. 29.21-22p3).

MPEC 2008-U83 - "14:23 UT" - 2008 UW91

K08U91W 2008 UW91 (Earth MOID=8.4 LD, H=21.6 ~162m) was discovered at 0406 UT on 28 Oct. by MLS, which observed it at Oct. 28.17-19p4 at V=20.2-21.4, 28.31-32p4 at V=21.4-22.1, and 29.31-33p4 at V=20.7-21.2. The discovery was confirmed by MRO (Oct. 28.25p5 & 29.29-30p4) and Spacewatch 1.8m (Oct. 29.20-21p2).

MPEC 2008-U82 - "14:20 UT" - 2008 UV91

K08U91V 2008 UV91 (risk-listed, H=19.9 ~355m) was discovered at 0327 UT on 28 Oct. by MLS, which observed it at Oct. 28.14-19p8 and 29.16-18p3. The discovery was confirmed by Spacewatch 1.8m (Oct. 29.11p3).

<< DOU on 29 Oct. '08 >> MPEC 2008-U81 - "06:14 UT" - Daily Orbit Update

Observations of risk-listed objects
K08U07E 2008 UE7 (arc=2 days, H=20.4 ~282m) from Sabino Canyon Obs. (Oct. 27.35p2), Junk Bond Obs. (Oct. 27.45-47p2 & 27.51p1), and Spacewatch 1.8m (Oct. 28.33-34p3)
K08U07B 2008 UB7 (small asteroid, arc=3 days, H=23.8 ~59m) from Spacewatch 1.8m (Oct. 29.15-16p3)
K08U05W 2008 UW5 (arc=3 days, H=17.9 ~891m) from Spacewatch 1.8m (Oct. 28.40-41p3)
K08U05V 2008 UV5 (small asteroid, arc=3 days, H=26.0 ~21m) from Spacewatch 1.8m (Oct. 28.29-30p3)
K08S07T 2008 ST7 (small asteroid, arc=34 days, H=24.1 ~51m) from MRO (Oct. 28.24p1 at R=22.3 & 28.28-29p2 at R=22.1-3)
Observations of recently (no longer) risk-listed objects
K08T27D 2008 TD27 (arc=18 days, H=20.0 ~339m) from Desert Moon Obs. (Oct. 28.07-13p3)
K08T26Q 2008 TQ26 (small asteroid, arc=19 days, H=23.4 ~71m) from MRO (Oct. 28.27p3)
K08T26P 2008 TP26 (small asteroid, arc=19 days, H=23.8 ~59m) from MRO (Oct. 28.32-33p3 at R=21.7-22.1)
K08T25V 2008 TV25 (arc=19 days, H=20.0 ~339m) from Desert Moon Obs. (Oct. 28.50-51p3)
K08T03Z 2008 TZ3 (arc=22 days, H=20.3 ~295m) from MRO (Oct. 28.30-31p4)
K08T02C 2008 TC2 (small asteroid, arc=25 days, H=23.1 ~81m) from Spacewatch 1.8m (Oct. 28.28-29p3) and MLS (Oct. 28.33-34p4)
Observations of small asteroids (H>22.0)
K08U05U 2008 UU5 (arc=3 days, H=23.2 ~78m) from MLS (Oct. 28.35-37p3 at V=21.0-22.3)
K08U02T 2008 UT2 (arc=6 days, H=25.1 ~32m) from MLS (Oct. 28.33-34p4) and Spacewatch 1.8m (Oct. 29.24p3)
K08U02S 2008 US2 (arc=5 days, H=23.8 ~59m) from Spacewatch 1.8m (Oct. 28.35p3)
K08U02R 2008 UR2 (arc=5 days, H=26.9 ~14m) from Spacewatch 1.8m (Oct. 28.31p3)
K08U00V 2008 UV (arc=7 days, H=24.8 ~37m) from Spacewatch 1.8m (Oct. 28.26-27p3)
K08U00B 2008 UB (i=36.1°, arc=10 days, H=22.2 ~123m) from Spacewatch 1.8m (Oct. 27.31-32p3 & 29.19p3)
K08T26M 2008 TM26 (arc=20 days, H=23.2 ~78m) from Spacewatch 1.8m (Oct. 29.22-23p3)
K08T04E 2008 TE4 (arc=21 days, H=24.1 ~51m) from Spacewatch 1.8m (Oct. 28.42-43p2)
K08SF0U 2008 SU150 (arc=30 days, H=22.8 ~93m) from Spacewatch 1.8m (Oct. 29.14p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K08U03N 2008 UN3 (arc=4 days, H=21.9 ~141m) from Spacewatch 1.8m (Oct. 28.36-37p3)
K08T00F 2008 TF (arc=28 days, H=21.9 ~141m) from Spacewatch 1.8m (Oct. 29.12-13p3)
K07D41M 2007 DM41 (arc=2 opp, H=21.8 ~148m) from LINEAR (Oct. 28.25-30p5)
Observations of other objects
K08U90P 2008 UP90 (q=2.005 AU, Q=4.371 AU, arc=1 day, H=15.6 ~2.57 km) from CSS (Oct. 27.45-47p4 discovery & Oct. 27.52p4), Jim Young via Table Mtn. Obs. (Oct. 27.52-53p4), Great Shefford Obs. (Oct. 28.19-20p3), Sandlot Obs. (Oct. 28.45-46p2), and MRO (Oct. 28.47-48p4)
K08U90L 2008 UL90 (IEO, Q=0.962 AU, arc=2 days, H=18.5 ~676m) from MLS (Oct. 28.49-50p4) and Spacewatch 1.8m (Oct. 28.52-53p3)
K08U04S 2008 US4 (arc=22 days, H=20.6 ~257m) from Petit Jean Mtn. South Obs. (PJMSO) (Oct. 28.18-19p7)
K08T26V 2008 TV26 (q=2.016 AU, arc=20 days, H=17.8 ~933m) from the Spacewatch 0.9m telescope (Oct. 28.15-19p3), LINEAR (Oct. 28.25-30p5), and Desert Moon Obs. (Oct. 28.43-45p3)
K08T10Q 2008 TQ10 (arc=20 days, H=20.5 ~269m) from Spacewatch 1.8m (Oct. 28.38-40p3)
K08T04F 2008 TF4 (arc=22 days, H=19.3 ~467m) from LINEAR (Oct. 28.19-23p5)
K08T04D 2008 TD4 (arc=21 days, H=19.7 ~389m) from Desert Moon Obs. (Oct. 28.17-20p3)
K08T01A 2008 TA1 (arc=27 days, H=18.6 ~645m) from Spacewatch 1.8m (Oct. 29.16-17p3)
K08SO5X 2008 SX245 (arc=29 days, H=17.8 ~933m) from MLS (Oct. 28.22-24p4)
K08S07P 2008 SP7 (Q=4.199 AU, arc=35 days, H=19.0 ~537m) from PJMSO (Oct. 28.24p6) and LINEAR (Oct. 28.31-35p5)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.4 ~708m) from CSS (Oct. 28.26-29p4) and Hamamatsu-Yuto Obs. (Oct. 28.57-60p3)
K08S00Q 2008 SQ (arc=37 days, H=19.5 ~426m) from PJMSO (Oct. 28.19-20p5) and CSS (Oct. 28.27-29p4 & 28.34-35p4)
K08S00E 2008 SE (arc=38 days, H=19.3 ~467m) from PJMSO (Oct. 28.21-22p6)
K08R26T 2008 RT26 (arc=51 days, H=19.3 ~467m) from MLS (Oct. 28.43-45p4)
K08M01R 2008 MR1 (arc=3 opp, H=18.4 ~708m) from PJMSO (Oct. 28.25-26p6)
K08M01H 2008 MH1 (Q=4.263 AU, arc=122 days, H=18.4 ~708m) from CSS (Oct. 28.11-14p4)
K08M00Z 2008 MZ (Q=4.207 AU, arc=135 days, H=18.7 ~616m) from PJMSO (Oct. 28.33-35p6)
K08J07Z 2008 JZ7 (Q=4.382 AU, arc=176 days, H=18.6 ~645m) from LINEAR (Oct. 28.13-18p4)
K08H38B 2008 HB38 (arc=181 days, H=21.1 ~204m) from Spacewatch 0.9m (Oct. 28.21-25p6)
K07J35J 2007 JJ35 (i=56.1°, arc=2 opp, H=18.4 ~708m) from Spacewatch 0.9m (Oct. 20.38-40p2)
K06V14B 2006 VB14 (arc=2 opp, H=18.7 ~616m) from CSS (Oct. 28.49-51p4)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.3 ~1.17 km) from PJMSO (Oct. 28.32p5) and Hamamatsu-Yuto Obs. (Oct. 28.78-82p8)
K05T51Z 2005 TZ51 (arc=3 opp, H=17.9 ~891m) from Hamamatsu-Yuto Obs. (Oct. 28.48-52p5)
K05N07D 2005 ND7 (i=52.6°, arc=2 opp, H=17.9 ~891m) from ARO (2007 Feb. 27.34-36p2 at V=22.8-23.0) and Spacewatch 1.8m (Oct. 28.51p4)
K04T11U 2004 TU11 (arc=2 opp, H=21.2 ~195m) from LINEAR (Oct. 28.30-35p5)
K03Y70R 2003 YR70 (arc=2 opp, H=20.0 ~339m) from Spacewatch 1.8m (Oct. 28.44-45p6 at V=21.7-22.8)
K03W07Q 2003 WQ7 (arc=2 opp, H=19.7 ~389m) from Spacewatch 1.8m (Oct. 28.47-48p6)
K03U20C 2003 UC20 (arc=4 opp, H=18.1 ~812m) from MLS (Oct. 28.49-50p3)
K01U04Y 2001 UY4 (q=0.309 AU, arc=5 opp, H=18.3 ~741m) from Hamamatsu-Yuto Obs. (Oct. 28.77-78p3)
K01T01W 2001 TW1 (arc=5 opp, H=19.1 ~513m) from PJMSO (Oct. 28.20-21p5)
K01SR6G 2001 SG276 (arc=4 opp, H=17.7 ~977m) from Spacewatch 0.9m (Oct. 28.15-19p3) and LINEAR (Oct. 28.26-30p5)
K01S10G 2001 SG10 (arc=5 opp, H=20.3 ~295m) from Goodricke-Pigott Obs. (Oct. 27.25-28p3)
J98V00O 1998 VO (arc=4 opp, H=20.4 ~282m) from LINEAR (Oct. 28.13-18p5)
J0166 190166 2005 UP156 from Spacewatch 0.9m (Oct. 28.22-25p3)
J0135 190135 2005 QE30 from CSS (Oct. 28.11-13p4)
I9552 189552 2000 RL77 from CSS (Oct. 28.11-13p4)
I5851 185851 2000 DP107 from LINEAR (Oct. 28.20-24p5) and Spacewatch 1.8m (Oct. 28.40-41p3)
G2900 162900 2001 HG31 from Spacewatch 0.9m (Oct. 28.27-30p3) and LINEAR (Oct. 28.31-35p5)
F5140 155140 2005 UD from LINEAR (Oct. 28.19-23p5)
F5110 155110 2005 TB from LINEAR (Oct. 28.31-36p5)
D7799 137799 1999 YB from LINEAR (Oct. 28.30-35p5)
D7052 137052 1998 VO33 from MLS (Oct. 28.43-45p4)
D7032 137032 1998 UO1 from LINEAR (Oct. 28.19-24p5)
90403 90403 2003 YE45 from LINEAR (Oct. 28.16-18p3)
52762 52762 1998 MT24 from CSS (Oct. 28.36-38p3)
18109 18109 2000 NG11 from Spacewatch 0.9m (Oct. 19.47-50p3)
08035 8035 1992 TB from the Siding Spring Survey (SSS) (Oct. 28.68-70p3)
07474 7474 1992 TC from Spacewatch 0.9m (Oct. 21.50-51p2)
05143 5143 Heracles (1991 VL) from LINEAR (Oct. 28.13-18p5)
03122 3122 Florence (1981 ET3) from CSS (Oct. 28.52-53p4)
02368 2368 Beltrovata (1977 RA) from LINEAR (Oct. 28.42-47p5)
02201 2201 Oljato (1947 XC) from LINEAR (Oct. 28.42-47p5) and Spacewatch 0.9m (Oct. 28.49-52p3)
01865 1865 Cerberus (1971 UA) from LINEAR (Oct. 28.19-23p5)

Observers on 29 October '08

Seventeen observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 2 in MPECs 2008-U81 & 2008-U90 -- 2007 EM88, 2005 ND7
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPEC 2008-U81 -- 2008 UP90, 2008 UP90, 2008 SQ1, 2008 SQ, 2008 MH1, 2006 VB14, 52762, 190135, 189552, 3122
`448`	Desert Moon Obs. in New Mexico, 4 in MPEC 2008-U81 -- 2008 TV26, 2008 TV25, 2008 TD4, 2008 TD27
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-U81 -- 2001 SG10
`J95`	Great Shefford Obs. in England, 1 in MPEC 2008-U81 -- 2008 UP90
`379`	Hamamatsu-Yuto Obs. in Japan, 4 in MPEC 2008-U81 -- 2008 SQ1, 2006 SZ217, 2005 TZ51, 2001 UY4
`701`	Junk Bond Obs. in Arizona, 1 in MPEC 2008-U81 -- 2008 UE7
`704`	LINEAR in New Mexico, 19 in MPEC 2008-U81 -- 2008 TV26, 2008 TF4, 2008 SP7, 2008 JZ7, 2007 DM41, 2004 TU11, 2001 SG276, 1998 VO, 90403, 185851, 162900, 155140, 155110, 137799, 137032, 5143, 2368, 2201, 1865
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 10 in MPECs 2008-U81, 2008-U83, 2008-U84, 2008-U85, 2008-U86 & 2008-U88 -- 2008 UZ91, 2008 UY91, 2008 UX91, 2008 UW91, 2008 UP90, 2008 UB92, 2008 TZ3, 2008 TQ26, 2008 TP26, 2008 ST7
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 15 in MPECs 2008-U81, 2008-U82, 2008-U83, 2008-U84, 2008-U85, 2008-U86, 2008-U87 & 2008-U88 -- 2008 UZ91, 2008 UY91, 2008 UX91, 2008 UW91, 2008 UV91, 2008 UU5, 2008 UT2, 2008 UL90, 2008 UB92, 2008 UA92, 2008 TC2, 2008 SX245, 2008 RT26, 2003 UC20, 137052
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2008-U81 -- 2008 US4, 2008 SQ, 2008 SP7, 2008 SE, 2008 MZ, 2008 MR1, 2006 SZ217, 2001 TW1
`854`	Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-U81 -- 2008 UE7
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2008-U81 -- 2008 UP90
`E12`	Siding Spring Survey in New South Wales, 1 in MPEC 2008-U81 -- 8035
`691`	Spacewatch 0.9m telescope in Arizona, 9 in MPEC 2008-U81 -- 2008 TV26, 2008 HB38, 2007 JJ35, 2001 SG276, 190166, 18109, 162900, 7474, 2201
`291`	Spacewatch 1.8m telescope in Arizona, 27 in MPECs 2008-U81, 2008-U82, 2008-U83, 2008-U84, 2008-U86 & 2008-U89 -- 2008 UZ91, 2008 UX91, 2008 UW91, 2008 UW5, 2008 UV91, 2008 UV5, 2008 UV, 2008 UT2, 2008 US2, 2008 UR2, 2008 UN3, 2008 UL90, 2008 UE7, 2008 UB7, 2008 UB, 2008 TQ10, 2008 TM26, 2008 TF, 2008 TE4, 2008 TC2, 2008 TA1, 2008 SU150, 2005 VO5, 2005 ND7, 2003 YR70, 2003 WQ7, 185851
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-U81 -- 2008 UP90

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

Impact Risk Monitoring on 29 October '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2359 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 UB92	JPL Sentry	1800	2015-2104	35	1.7e-08	-7.12	-7.70	0	JPL: "Analysis based on 12 observations spanning .08120 days (2008-Oct-29.35395 to 2008-Oct-29.43515)." Diameter approximately 0.035 km. from mean, weighted H=24.9.

2008 UA92	JPL Sentry	1659	2062-2106	3	2.5e-08	-8.86	-8.88	0	JPL: "Analysis based on 15 observations spanning 1.0601 days (2008-Oct-28.40865 to 2008-Oct-29.46874)." Diameter approximately 0.012 km. from mean, weighted H=27.3.

2008 UY91	JPL Sentry	1659	2014-2107	39	2.4e-08	-6.81	-7.24	0	JPL: "Analysis based on 13 observations spanning .11968 days (2008-Oct-28.2208 to 2008-Oct-28.34048)." Diameter approximately 0.041 km. from mean, weighted H=24.6.

2008 UV91	JPL Sentry	1659	2016-2095	21	4.2e-09	-5.45	-5.85	0	JPL: "Analysis based on 14 observations spanning 1.0350 days (2008-Oct-28.14388 to 2008-Oct-29.17888)." Diameter approximately 0.340 km. from mean, weighted H=20.0.

2008 UE7	JPL Sentry	1250	R E M O V E D						JPL: Risk listing removed at 1017 UTC.

2008 UB7	JPL Sentry	1250	2044-2100	44	4.6e-05	-3.62	-3.98	0	JPL: "Analysis based on 34 observations spanning 2.8980 days (2008-Oct-26.25877 to 2008-Oct-29.15677)." Diameter approximately 0.059 km. from mean, weighted H=23.8.
2008 UB7	NEODyS	1250	2044-2088	50	4.24e-05	-3.65	-3.99	0	NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2008/10/26.260 to 2008/10/29.158."

2008 UW5	NEODyS	1250	R E M O V E D						-

2008 UV5	JPL Sentry	1250	R E M O V E D						JPL: Risk listing removed at 0950 UTC.
2008 UV5	NEODyS	1250	R E M O V E D						-

2008 ST7	JPL Sentry	1250	2074-2105	17	4.8e-05	-4.21	-4.49	0	JPL: "Analysis based on 110 observations spanning 33.992 days (2008-Sep-24.29993 to 2008-Oct-28.2916)." Diameter approximately 0.051 km. from mean, weighted H=24.1.
2008 ST7	NEODyS	1250	2073-2089	3	2.02e-07	-6.43	-6.50	0	NEODyS: "Based on 116 optical observations (of which 6 are rejected as outliers) from 2008/09/24.301 to 2008/10/28.292."

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 29 October '08

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

1859	Grabbed MPEC 2008-U90 - 2007 EM88 - see above
1800	Noted that JPL Sentry has posted 2008 UB92 as an impact risk - see above
1659	Noted that JPL Sentry has posted 2008 UA92 as an impact risk - see above Noted that JPL Sentry has posted 2008 UV91 as an impact risk - see above Noted that JPL Sentry has posted 2008 UY91 as an impact risk - see above Grabbed MPEC 2008-U82 - 2008 UV91 - see above Grabbed MPEC 2008-U83 - 2008 UW91 - see above Grabbed MPEC 2008-U84 - 2008 UX91 - see above Grabbed MPEC 2008-U85 - 2008 UY91 - see above Grabbed MPEC 2008-U86 - 2008 UZ91 - see above Grabbed MPEC 2008-U87 - 2008 UA92 - see above Grabbed MPEC 2008-U88 - 2008 UB92 - see above Grabbed MPEC 2008-U89 - 2005 VO5 - see above
1250	Noted that JPL Sentry has updated its 2008 ST7 risk assessment - see above Noted that NEODyS has updated its 2008 ST7 risk assessment - see above Noted that JPL Sentry has updated its 2008 UB7 risk assessment - see above Noted that NEODyS has updated its 2008 UB7 risk assessment - see above Noted that JPL Sentry has removed 2008 UE7 as an impact risk - see above Noted that JPL Sentry has removed 2008 UV5 as an impact risk - see above Noted that NEODyS has removed 2008 UV5 as an impact risk - see above Noted that NEODyS has removed 2008 UW5 as an impact risk - see above Grabbed MPEC 2008-U81 - Daily Orbit Update - see above

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