2008-10-31 Tracking News

Contents on 31 October '08

IAU Minor Planet Center
- NEOCP Activity -- ten listings: 4 new, 6 updated
- New MPECs -- seven MPECs
Observers -- sixteen 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 31 October '08

The MPC's NEO Confirmation Page has 10 listings: 4 new, 6 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had four new and six updated listings. Of these, nine were "one nighters." So far The Tracking News has counted a total of eighteen 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 31 October '08

Minor Planet Electronic Circulars

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

MPEC 2008-U102 time-stamped "00:14 UT" - 2008 UU95 - see below
MPEC 2008-U103 time-stamped "06:15 UT" - Daily Orbit Update - see below
MPEC 2008-U104 time-stamped "13:07 UT" - 2008 UT99 - see below
MPEC 2008-U105 time-stamped "13:39 UT" - 2008 UU99 - see below
MPEC 2008-U106 time-stamped "13:42 UT" - 2008 UV99 - see below
MPEC 2008-U107 time-stamped "13:44 UT" - 2008 UW99 - see below
MPEC 2008-U108 time-stamped "21:06 UT" - 2008 UP100

MPEC 2008-U108 - "21:06 UT" - 2008 UP100

K08UA0P 2008 UP100 (small asteroid, H=23.3 ~74m) was discovered at 0421 UT on 31 Oct. by the Catalina Sky Survey (CSS), which observed it at Oct. 31.18-20p4. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Oct. 31.35-36p5) and Great Shefford Obs. (Oct. 31.77-78p5).

MPEC 2008-U107 - "13:44 UT" - 2008 UW99

K08U99W 2008 UW99 (risk-listed, Earth MOID=2.3 LD, H=24.6 ~41m) was discovered at 1059 UT on 31 Oct. by CSS, which observed it at Oct. 31.46-51p8. The discovery was confirmed by MRO (Oct. 31.51p5). This object is now within ten lunar distances (LD) of Earth, reaching 6.2 LD on 31 Oct.

MPEC 2008-U106 - "13:42 UT" - 2008 UV99

K08U99V 2008 UV99 (i=40.6°, H=19.1 ~513m) was discovered at 0251 UT on 31 Oct. by CSS, which observed it at Oct. 31.12-20p11. The discovery was confirmed by MRO (Oct. 31.20-22p4) and the Mt. Lemmon Survey (MLS) (Oct. 31.27-29p4).

MPEC 2008-U105 - "13:39 UT" - 2008 UU99

K08U99U 2008 UU99 (small asteroid, H=25.1 ~32m) was discovered at 0831 UT on 30 Oct. by the Spacewatch 1.8m telescope, which observed it at Oct. 30.36p3, 30.42p3, and 31.24-25p3. The discovery was confirmed by MRO (Oct. 30.39p4, 30.45p3 & 31.30-31p4), Great Shefford Obs. (Oct. 31.05-06p2), and Astronomical Research Obs. (ARO) (Oct. 31.20-21p3).

MPEC 2008-U104 - "13:07 UT" - 2008 UT99

K08U99T 2008 UT99 (small asteroid, H=24.4 ~45m) was discovered at 0745 UT on 30 Oct. by the Spacewatch 0.9m telescope, which observed it at Oct. 30.32-36p3. The discovery was confirmed by Spacewatch 1.8m (Oct. 30.43-44p2 & 31.42p2) and MRO (Oct. 30.46-47p4 & 31.37-38p4).

<< DOU on 31 Oct. '08 >> MPEC 2008-U103 - "06:15 UT" - Daily Orbit Update

Observations of risk-listed objects
K08U95B 2008 UB95 (small asteroid, arc=2 days, H=24.6 ~41m) from ARO (Oct. 30.12-14p3) and Spacewatch 1.8m (Oct. 31.14-15p3)
K08U94Z 2008 UZ94 (arc=3 days, H=17.2 ~1.23 km) from ARO (Oct. 30.02-03p3), LINEAR (Oct. 30.07-12p5), and Spacewatch 1.8m (Oct. 31.10-11p3)
K08U92B 2008 UB92 (small asteroid, arc=1 day, H=24.7 ~39m) from Spacewatch 1.8m (Oct. 30.26-27p3)
K08U92A 2008 UA92 (small asteroid, Q=4.027 AU, arc=2 days, H=27.4 ~11m) from Spacewatch 1.8m (Oct. 30.38-39p2)
K08U07B 2008 UB7 (small asteroid, arc=4 days, H=23.8 ~59m) from MRO (Oct. 30.32p5)
K08S07T 2008 ST7 (small asteroid, arc=36 days, H=24.1 ~51m) from MRO (Oct. 30.35-36p2 at R=21.8-22.6)
Observations of recently (no longer) risk-listed objects
K08U07E 2008 UE7 (arc=4 days, H=20.2 ~309m) from LINEAR (Oct. 30.31-36p4)
K08U05V 2008 UV5 (small asteroid, Q=4.051 AU, arc=5 days, H=26.1 ~20m) from ARO (Oct. 30.22-25p3 at V=22.0-22.2)
K08U01F 2008 UF1 (small asteroid, arc=8 days, H=26.0 ~21m) from ARO (Oct. 30.12-15p3 at V=22.1-2)
K08T10R 2008 TR10 (arc=23 days, H=20.4 ~282m) from Spacewatch 1.8m (Oct. 30.30-31p3 at V=22.0-22.2 & 31.17p3)
K08S82J 2008 SJ82 (arc=34 days, H=20.6 ~257m) from Desert Moon Obs. (Oct. 30.41-43p3)
Observations of small asteroids (H>22.0)
K08U03M 2008 UM3 (arc=6 days, H=24.8 ~37m) from Spacewatch 1.8m (Oct. 30.35-36p3)
K08U02S 2008 US2 (arc=7 days, H=23.7 ~62m) from Spacewatch 1.8m (Oct. 30.45p2)
K08U02R 2008 UR2 (arc=7 days, H=26.9 ~14m) from Spacewatch 1.8m (Oct. 30.34-35p3)
K08U01E 2008 UE1 (arc=10 days, H=24.1 ~51m) from ARO (Oct. 30.17-21p3 at V=22.4-7) and Spacewatch 1.8m (Oct. 30.24p3 at V=22.5-8 & 31.19-20p2 at V=22.7)
K08U00B 2008 UB (arc=11 days, H=22.2 ~123m) from Spacewatch 1.8m (Oct. 30.29-30p3)
K08T03X 2008 TX3 (arc=24 days, H=24.9 ~35m) from ARO (Oct. 30.29p4)
Observations of almost-small asteroids (21.7<H<=22.0)
K08U03N 2008 UN3 (arc=6 days, H=21.9 ~141m) from Spacewatch 1.8m (Oct. 30.46p2)
K07D41M 2007 DM41 (arc=2 opp, H=21.8 ~148m) from MLS (Oct. 30.37-40p4)
Observations of other objects
K08U95C 2008 UC95 (arc=1 day, H=18.3 ~741m) from LINEAR (Oct. 30.39-47p7) and Junk Bond Obs. (Oct. 30.44-46p2 & 30.50p1)
K08U90O 2008 UO90 (arc=3 days, H=20.5 ~269m) from Spacewatch 1.8m (Oct. 30.37p3)
K08U90N 2008 UN90 (arc=3 days, H=19.9 ~355m) from LINEAR (Oct. 30.14-18p4)
K08U07D 2008 UD7 (arc=4 days, H=18.8 ~589m) from Desert Moon Obs. (Oct. 30.36-38p3)
K08U04S 2008 US4 (arc=24 days, H=20.6 ~257m) from Hamamatsu-Yuto Obs. (Oct. 30.54-55p2 & 30.64-66p5)
K08U00X 2008 UX (q=0.262 AU, arc=9 days, H=20.7 ~245m) from LINEAR (Oct. 30.20-25p4)
K08TF7E 2008 TE157 (Q=4.438 AU, arc=28 days, H=20.5 ~269m) from Desert Moon Obs. (Oct. 30.17-21p3)
K08T26N 2008 TN26 (arc=21 days, H=20.2 ~309m) from Desert Moon Obs. (Oct. 30.25-32p3)
K08T04F 2008 TF4 (arc=24 days, H=19.3 ~467m) from LINEAR (Oct. 30.25-30p5)
K08T01A 2008 TA1 (arc=29 days, H=18.6 ~645m) from Spacewatch 1.8m (Oct. 31.13-14p3)
K08S85C 2008 SC85 (arc=33 days, H=19.4 ~446m) from Desert Moon Obs. (Oct. 30.09-13p3)
K08S11W 2008 SW11 (arc=35 days, H=21.2 ~195m) from Spacewatch 0.9m (Oct. 28.10-14p2)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.4 ~708m) from Hamamatsu-Yuto Obs. (Oct. 30.58-61p7)
K08S00O 2008 SO (arc=40 days, H=20.9 ~224m) from Spacewatch 1.8m (Oct. 31.12-13p3)
K08S00E 2008 SE (arc=40 days, H=19.3 ~467m) from Hamamatsu-Yuto Obs. (Oct. 30.67p3)
K08R24Y 2008 RY24 (arc=3 opp, H=17.8 ~933m) from MLS (Oct. 30.19-21p4)
K08Q00F 2008 QF (arc=70 days, H=21.6 ~162m) from ARO (Oct. 30.07-09p2 at V=22.4-5)
K08O08X 2008 OX8 (arc=91 days, H=21.6 ~162m) from ARO (Oct. 30.03-06p3 at V=22.1-3)
K08M01R 2008 MR1 (arc=3 opp, H=18.4 ~708m) from CSS (Oct. 30.37-38p4)
K07G03S 2007 GS3 (arc=2 opp, H=19.4 ~446m) from CSS (Oct. 30.13-15p4)
K07E88M 2007 EM88 (arc=2 opp, H=19.4 ~446m) from Spacewatch 0.9m (Oct. 30.49p1 at V=22.2)
K06U63C 2006 UC63 (arc=2 opp, H=19.9 ~355m) from Spacewatch 1.8m (Oct. 30.50-51p3)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.3 ~1.17 km) from Hamamatsu-Yuto Obs. (Oct. 30.77-81p11)
K06G00Z 2006 GZ (arc=2 opp, H=19.5 ~426m) from Ametlla del Valles Obs. (Oct. 30.09-10p5)
K05YC8Y 2005 YY128 (arc=4 opp, H=18.3 ~741m) from Spacewatch 0.9m (Oct. 30.22-25p3) and MLS (Oct. 30.41-43p4)
K05V05O 2005 VO5 (arc=2 opp, H=19.8 ~371m) from David Tholen's team on Mauna Kea (Oct. 22.61p3 at R=22.5-9)
K05T15R 2005 TR15 (arc=2 opp, H=18.6 ~645m) from Spacewatch 0.9m (Oct. 27.10-15p3)
K05L03R 2005 LR3 (arc=4 opp, H=17.1 ~1.29 km) from LINEAR (Oct. 30.43-48p5)
K04X45A 2004 XA45 (arc=4 opp, H=21.0 ~214m) from Tholen et al. (Oct. 22.60p2)
K04T19L 2004 TL19 (arc=2 opp, H=20.7 ~245m) from Spacewatch 0.9m (Oct. 27.13-15p2 & 29.09-13p3)
K04S20B 2004 SB20 (arc=3 opp, H=18.5 ~676m) from Jim Young via Table Mtn. Obs. (Oct. 30.25-27p4)
K04B11G 2004 BG11 (arc=3 opp, H=18.6 ~645m) from MLS (Oct. 30.50-51p4) and Spacewatch 1.8m (Oct. 30.52-53p3)
K03Y00L 2003 YL (arc=4 opp, H=19.8 ~371m) from Spacewatch 0.9m (Oct. 28.50-52p2)
K03D10X 2003 DX10 (arc=4 opp, H=20.3 ~295m) from ARO (Oct. 30.28-31p3 at V=22.5-7)
K02V94Y 2002 VY94 (Q=5.375 AU, arc=2 opp, H=16.8 ~1.48 km) from Spacewatch 0.9m (Oct. 27.39p1 & 27.43p1) and Ametlla del Valles Obs. (Oct. 30.10-12p3)
K01Y11X 2001 YX11 (arc=3 opp, H=20.0 ~339m) from Spacewatch 1.8m (Oct. 30.47-48p3)
K01V05G 2001 VG5 (arc=6 opp, H=16.7 ~1.55 km) from Spacewatch 0.9m (Oct. 29.42-45p3)
K01U04Y 2001 UY4 (q=0.309 AU, arc=5 opp, H=18.3 ~741m) from CSS (Oct. 30.34-36p3) and Hamamatsu-Yuto Obs. (Oct. 30.73-76p9)
K01T00C 2001 TC (arc=2 opp, H=20.7 ~245m) from MLS (Oct. 30.24-26p4)
K01SR6G 2001 SG276 (arc=4 opp, H=17.7 ~977m) from Spacewatch 0.9m (Oct. 30.16-20p3)
K01S10G 2001 SG10 (arc=5 opp, H=20.3 ~295m) from LINEAR (Oct. 30.25-30p5)
K01QI1P 2001 QP181 (arc=2 opp, H=18.0 ~851m) from Spacewatch 0.9m (Oct. 27.23-26p2)
K00S43P 2000 SP43 (arc=5 opp, H=18.6 ~645m) from MLS (Oct. 30.12-14p4)
J97U09S 1997 US9 (arc=6 opp, H=17.3 ~1.17 km) from CSS (Oct. 29.47-49p4)
I9552 189552 2000 RL77 from MLS (Oct. 30.19-21p4)
G8044 168044 2005 SG from Ametlla del Valles Obs. (Oct. 30.08p3)
G3000 163000 2001 SW169 from CSS (Oct. 30.16-19p4)
G2900 162900 2001 HG31 from Hamamatsu-Yuto Obs. (Oct. 30.70-72p6)
F9923 159923 2004 YJ32 from Spacewatch 0.9m (Oct. 30.49-51p3)
F5110 155110 2005 TB from Spacewatch 0.9m (Oct. 28.38-42p3)
E4901 144901 2004 WG1 from CSS (Oct. 29.29-31p4) and LINEAR (Oct. 30.20-25p5)
E2348 142348 2002 RX211 from El Leoncito Obs. (Oct. 28.28-31p4)
E1765 141765 2002 MP3 from CSS (Oct. 29.47-49p4)
D7799 137799 1999 YB from Spacewatch 0.9m (Oct. 29.21-24p3 & 30.17-20p3)
96744 96744 1999 OW3 from CSS (Oct. 29.29-31p4)
90075 90075 2002 VU94 from Spacewatch 0.9m (Oct. 29.15-19p3)
87684 87684 2000 SY2 from El Leoncito Obs. (Oct. 28.08-13p4)
85774 85774 1998 UT18 from CSS (Oct. 30.39-41p4)
66008 66008 1998 QH2 from MLS (Oct. 30.13-15p4)
54071 54071 2000 GQ146 from LINEAR (Oct. 30.20-25p5)
53319 53319 1999 JM8 from El Leoncito Obs. (Oct. 28.21-24p5)
22753 22753 1998 WT from Spacewatch 0.9m (Oct. 29.48-50p3)
19764 19764 2000 NF5 from Spacewatch 0.9m (Oct. 29.47-50p3 at V=21.7-22.1)
07888 7888 1993 UC from CSS (Oct. 29.22-24p4)
06611 6611 1993 VW from MLS (Oct. 30.21-23p4)
05332 5332 1990 DA from El Leoncito Obs. (Oct. 28.05-08p4)
05131 5131 1990 BG from El Leoncito Obs. (Oct. 28.17-21p5)
05011 5011 Ptah (6743 P-L) from CSS (Oct. 30.09-12p4)
04596 4596 1981 QB from Desert Moon Obs. (Oct. 30.47-48p4)
04450 4450 Pan (1987 SY) from CSS (Oct. 30.30-32p4 & 30.37-38p4)
03691 3691 Bede (1982 FT) from LINEAR (Oct. 30.07-12p5)
01980 1980 Tezcatlipoca (1950 LA) from Thompsonville Obs. (Oct. 31.06-07p6)
01943 1943 Anteros (1973 EC) from LINEAR (Oct. 30.44-48p5)
01865 1865 Cerberus (1971 UA) from Hamamatsu-Yuto Obs. (Oct. 30.51-52p4)
01627 1627 Ivar (1929 SH) from El Leoncito Obs. (Oct. 28.26-30p4) and CSS (Oct. 30.27-29p4)
00887 887 Alinda (1918 DB) from LINEAR (Oct. 30.08-13p5)

MPEC 2008-U102 - "00:14 UT" - 2008 UU95

K08U95U 2008 UU95 (risk-listed, Earth MOID=3.0 LD, H=23.4 ~71m) was discovered at 0906 UT on 30 Oct. by MLS, which observed it at Oct. 30.38-45p8. The discovery was confirmed by MRO (Oct. 30.43-44p4) and Great Shefford Obs. (Oct. 30.95-96p3).

Observers on 31 October '08

Sixteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`B37`	Ametlla del Valles Obs. in Spain, 3 in MPEC 2008-U103 -- 2006 GZ, 2002 VY94, 168044
`H55`	Astronomical Research Obs. (ARO) in Illinois, 10 in MPECs 2008-U103 & 2008-U105 -- 2008 UZ94, 2008 UV5, 2008 UU99, 2008 UF1, 2008 UE1, 2008 UB95, 2008 TX3, 2008 QF, 2008 OX8, 2003 DX10
`703`	Catalina Sky Survey (CSS) in Arizona, 16 in MPECs 2008-U103, 2008-U106, 2008-U107 & 2008-U108 -- 2008 UW99, 2008 UV99, 2008 UP100, 2008 MR1, 2007 GS3, 2001 UY4, 1997 US9, 96744, 85774, 163000, 144901, 141765, 7888, 5011, 4450, 1627
`448`	Desert Moon Obs. in New Mexico, 6 in MPEC 2008-U103 -- 2008 UD7, 2008 TN26, 2008 TE157, 2008 SJ82, 2008 SC85, 4596
`808`	El Leoncito Obs. in Argentina, 6 in MPEC 2008-U103 -- 87684, 53319, 142348, 5332, 5131, 1627
`J95`	Great Shefford Obs. in England, 3 in MPECs 2008-U102, 2008-U105 & 2008-U108 -- 2008 UU99, 2008 UU95, 2008 UP100
`379`	Hamamatsu-Yuto Obs. in Japan, 7 in MPEC 2008-U103 -- 2008 US4, 2008 SQ1, 2008 SE, 2006 SZ217, 2001 UY4, 162900, 1865
`701`	Junk Bond Obs. in Arizona, 1 in MPEC 2008-U103 -- 2008 UC95
`704`	LINEAR in New Mexico, 13 in MPEC 2008-U103 -- 2008 UZ94, 2008 UX, 2008 UN90, 2008 UE7, 2008 UC95, 2008 TF4, 2005 LR3, 2001 SG10, 54071, 144901, 3691, 1943, 887
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 8 in MPECs 2008-U102, 2008-U103, 2008-U104, 2008-U105, 2008-U106, 2008-U107 & 2008-U108 -- 2008 UW99, 2008 UV99, 2008 UU99, 2008 UU95, 2008 UT99, 2008 UP100, 2008 UB7, 2008 ST7
`5682`	David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2008-U103 -- 2005 VO5, 2004 XA45
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2008-U102, 2008-U103 & 2008-U106 -- 2008 UV99, 2008 UU95, 2008 RY24, 2007 DM41, 2005 YY128, 2004 BG11, 2001 TC, 2000 SP43, 66008, 189552, 6611
`691`	Spacewatch 0.9m telescope in Arizona, 17 in MPECs 2008-U103 & 2008-U104 -- 2008 UT99, 2008 SW11, 2007 EM88, 2005 YY128, 2005 TR15, 2004 TL19, 2003 YL, 2002 VY94, 2001 VG5, 2001 SG276, 2001 QP181, 90075, 22753, 19764, 159923, 155110, 137799
`291`	Spacewatch 1.8m telescope in Arizona, 19 in MPECs 2008-U103, 2008-U104 & 2008-U105 -- 2008 UZ94, 2008 UU99, 2008 UT99, 2008 US2, 2008 UR2, 2008 UO90, 2008 UN3, 2008 UM3, 2008 UE1, 2008 UB95, 2008 UB92, 2008 UB, 2008 UA92, 2008 TR10, 2008 TA1, 2008 SO, 2006 UC63, 2004 BG11, 2001 YX11
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-U103 -- 2004 SB20
`H53`	Thompsonville Obs. in Illinois, 1 in MPEC 2008-U103 -- 1980

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

Impact Risk Monitoring on 31 October '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 UW99	JPL Sentry	2010	2010-2108	306	7.2e-06	-4.28	-4.74	0	JPL: "Analysis based on 13 observations spanning .05462 days (2008-Oct-31.45784 to 2008-Oct-31.51246)." Diameter approximately 0.040 km. from mean, weighted H=24.6.

2008 UU95	NEODyS	1320	2011-2090	119	4.17e-07	-5.19	-5.51	0	NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2008/10/30.380 to 2008/10/30.963."
2008 UU95	JPL Sentry	0359	2011-2108	425	1.2e-06	-4.80	-5.32	0	JPL: "Analysis based on 15 observations spanning .58345 days (2008-Oct-30.37925 to 2008-Oct-30.9627)." Diameter approximately 0.068 km. from mean, weighted H=23.5.

2008 UT95	JPL Sentry	0157	2077	1	8.6e-09	-9.10	-9.10	0	JPL: "Analysis based on 16 observations spanning .47706 days (2008-Oct-30.37815 to 2008-Oct-30.85521)." Diameter approximately 0.012 km. from mean, weighted H=27.2.

2008 UB95	JPL Sentry	1320	R E M O V E D						JPL: Risk listing removed at 1035 UTC.

2008 UZ94	JPL Sentry	1320	R E M O V E D						JPL: Risk listing removed at 0951 UTC.

2008 UB92	NEODyS	1320	R E M O V E D						-
2008 UB92	JPL Sentry	1320	R E M O V E D						JPL: Risk listing removed at 1030 UTC.

2008 UA92	JPL Sentry	2301	2063-2078	2	1.2e-06	-7.26	-7.28	0	JPL #2 for the day: "Analysis based on 17 observations spanning 1.9764 days (2008-Oct-28.40865 to 2008-Oct-30.38509)." Diameter approximately 0.012 km. from mean, weighted H=27.3.
2008 UA92	NEODyS	1320	2063-2078	2	9.63e-07	-7.37	-7.37	0	NEODyS: "Based on 17 optical observations (of which 1 are rejected as outliers) from 2008/10/28.409 to 2008/10/30.386."

2008 UB7	NEODyS	2010	2044-2088	44	8.88e-05	-3.31	-3.82	0	NEODyS: "Based on 43 optical observations (of which 0 are rejected as outliers) from 2008/10/26.260 to 2008/10/30.323."
2008 UB7	JPL Sentry	1320	2044-2100	38	9.7e-05	-3.28	-3.80	0	JPL: "Analysis based on 43 observations spanning 4.0635 days (2008-Oct-26.25877 to 2008-Oct-30.32229)." Diameter approximately 0.059 km. from mean, weighted H=23.8.

2008 ST7	JPL Sentry	1320	2074-2105	21	3.5e-05	-4.34	-4.63	0	JPL: "Analysis based on 114 observations spanning 36.060 days (2008-Sep-24.29993 to 2008-Oct-30.35974)." Diameter approximately 0.052 km. from mean, weighted H=24.1.
2008 ST7	NEODyS	1320	2074-2089	6	4.34e-07	-6.12	-6.31	0	NEODyS: "Based on 120 optical observations (of which 6 are rejected as outliers) from 2008/09/24.301 to 2008/10/30.360."

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 31 October '08

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

2301	Noted that JPL Sentry has updated its 2008 UA92 risk assessment - see above
2232	Grabbed MPEC 2008-U108 - 2008 UP100 - see above
2010	Noted that NEODyS has updated its 2008 UB7 risk assessment - see above Noted that JPL Sentry has posted 2008 UW99 as an impact risk - see above
1353	Grabbed MPEC 2008-U104 - 2008 UT99 - see above Grabbed MPEC 2008-U105 - 2008 UU99 - see above Grabbed MPEC 2008-U106 - 2008 UV99 - see above Grabbed MPEC 2008-U107 - 2008 UW99 - see above
1320	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 UA92 risk assessment - see above Noted that NEODyS has updated its 2008 UA92 risk assessment - see above Noted that JPL Sentry has updated its 2008 UB7 risk assessment - see above Noted that JPL Sentry has removed 2008 UB92 as an impact risk - see above Noted that NEODyS has removed 2008 UB92 as an impact risk - see above Noted that JPL Sentry has removed 2008 UB95 as an impact risk - see above Noted that NEODyS has posted 2008 UU95 as an impact risk - see above Noted that JPL Sentry has removed 2008 UZ94 as an impact risk - see above Grabbed MPEC 2008-U103 - Daily Orbit Update - see above
0359	Noted that JPL Sentry has posted 2008 UU95 as an impact risk - see above
0157	Noted that JPL Sentry has posted 2008 UT95 as an impact risk - see above
0030	Grabbed MPEC 2008-U102 - 2008 UU95 - see above

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