6 Dec '07 Tracking News

Contents on 6 December '07

IAU Minor Planet Center
- NEOCP Activity -- eight listings: 3 new, 5 updated
- New MPECs -- nine MPECs
- Observers -- 21 observing facilities
Impact Risk Monitoring -- three 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 news: framed access (best), RSS news feed (flags updates), or redirection - Note: A/CC has a main Web site and a backup site, which now has its own backup 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 this year 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 6 December '07

The MPC's NEO Confirmation Page has 8 listings: 3 new, 5 updated

When last checked at 2355 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had three new and five updated listings. Of these, six were "one nighters." So far The Tracking News has counted a total of 22 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 6 December '07

Minor Planet Electronic Circulars

As of last check at 2355 UTC, there have been nine MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-X25 time-stamped "03:27 UT" - 2007 RH283 - see below
MPEC 2007-X26 time-stamped "07:11 UT" - Daily Orbit Update - see below
MPEC 2007-X27 time-stamped "18:07 UT" - 2007 XY9 - see below
MPEC 2007-X28 time-stamped "18:11 UT" - 2007 XZ9 - see below
MPEC 2007-X29 time-stamped "18:13 UT" - 2007 XA10 - see below
MPEC 2007-X30 time-stamped "18:16 UT" - 2007 XB10 - see below
MPEC 2007-X31 time-stamped "18:18 UT" - 2007 XC10 - see below
MPEC 2007-X32 time-stamped "18:21 UT" - 2007 XD10 - see below
MPEC 2007-X33 time-stamped "19:17 UT" - 2005 VT5

MPEC 2007-X33 - "19:17 UT" - 2005 VT5

K05V05T 2005 VT5 (H=19.2 ~490m) from Astronomical Research Obs. (ARO) (Nov. 16.40-41p3 & Dec. 6.45-46p3)

MPEC 2007-X32 - "18:21 UT" - 2007 XD10

K07X10D 2007 XD10 (risk-listed, H=20.6 ~257m) was discovered at 1038 UT on 5 Dec. by the Spacewatch 0.9m telescope, which observed it at Dec. 5.44-48p3 and 6.32p2. The discovery was confirmed by the Spacewatch 1.8m telescope (Dec. 5.52-53p3).

MPEC 2007-X31 - "18:18 UT" - 2007 XC10

K07X10C 2007 XC10 (i=49.3°, H=19.2 ~490m) was discovered at 0847 UT on 5 Dec. by the Mt. Lemmon Survey (MLS), which observed it at Dec. 5.37-38p4 and 6.30-34p4. The discovery was confirmed by San Marcello Pistoiese Obs. (Dec. 5.85-86p3), Remanzacco Obs. (Dec. 5.88-89p3), Farra d'Isonzo Obs. (Dec. 5.97-01p2), Great Shefford Obs. (Dec. 5.98-99p3), Alter Satzberg Obs. (Dec. 6.05-06p3), and Grasslands Obs. (Dec. 6.28p2).

MPEC 2007-X30 - "18:16 UT" - 2007 XB10

K07X10B 2007 XB10 (H=18.1 ~812m) was discovered at 0359 UT on 5 Dec. by the Spacewatch 0.9m, which observed it at Dec. 5.17-20p3 and 6.23-25p5. The discovery was confirmed by Spacewatch 1.8m (Dec. 5.29-30p3) and ARO (Dec. 6.30-31p3).

MPEC 2007-X29 - "18:13 UT" - 2007 XA10

K07X10A 2007 XA10 (small asteroid, H=22.9 ~89m) was discovered at 0738 UT on 4 Dec. by LINEAR, which observed it at Dec. 4.32-36p4 and 5.25-29p4. The discovery was confirmed by Grasslands Obs. (Dec. 6.33p3).

MPEC 2007-X28 - "18:11 UT" - 2007 XZ9

K07X09Z 2007 XZ9 (risk-listed, Earth MOID=0.7 LD, H=24.7 ~39m) was discovered at 0439 UT on 4 Dec. by LINEAR, which observed it at Dec. 4.19-24p5 and 5.18-24p5. The discovery was confirmed by Great Shefford Obs. (Dec. 5.95-97p4), Alter Satzberg Obs. (Dec. 6.01-03p4), Farra d'Isonzo Obs. (Dec. 6.03-05p3), Grasslands Obs. (Dec. 6.21p3), and MLS (Dec. 6.28-30p4).

MPEC 2007-X27 - "18:07 UT" - 2007 XY9

K07X09Y 2007 XY9 (Earth MOID=3.8 LD, H=21.0 ~214m) was discovered at 0135 UT on 4 Dec. by LINEAR, which observed it at Dec. 4.07-11p4. The discovery was confirmed by the Catalina Sky Survey (CSS) (Dec. 6.06-08p4 & 6.14p4) and Grasslands Obs. (Dec. 6.21p3).

<< DOU on 6 Dec. '07 >> MPEC 2007-X26 - "07:11 UT" - Daily Orbit Update

Observations of risk-listed objects
K07W03Y 2007 WY3 (Q=4.935 AU, arc=17 days, H=18.2 ~776m) from Spacewatch 1.8m (Dec. 5.32-33p3)
K07W03P 2007 WP3 (small asteroid, arc=17 days, H=23.5 ~68m) from Spacewatch 1.8m (Dec. 5.20p3)
Observations of recently (no longer) risk-listed objects
K07W55E 2007 WE55 (arc=6 days, H=20.0 ~339m) from Petit Jean Mtn. South Obs. (PJMSO) (Dec. 5.35-36p7)
K07W04V 2007 WV4 (i=38.3°, arc=16 days, H=19.1 ~513m) from PJMSO (Dec. 5.37p5)
K07W00A 2007 WA (small asteroid, arc=8 days, H=24.7 ~39m) from Tim Spahr via Whipple Obs. (Nov. 17.25p2)
K07V08J 2007 VJ8 (small asteroid, Q=4.338 AU, arc=30 days, H=25.0 ~34m) from Spacewatch 1.8m (Dec. 5.24-25p3)
K07U01Y 2007 UY1 (small asteroid, arc=44 days, H=22.8 ~93m) from Spahr/Whipple (Oct. 20.10-11p2)
K07T24U 2007 TU24 (arc=54 days, H=20.1 ~323m) from Spahr/Whipple (Oct. 18.31p2)
Observations of small asteroids (H>22.0)
K07W05D 2007 WD5 (Q=4.093 AU, arc=15 days, H=24.3 ~47m) from Spacewatch 1.8m (Dec. 4.22p2)
K07V83W 2007 VW83 (arc=11 days, H=24.2 ~49m) from Spahr/Whipple (Nov. 16.16p2 & 18.09-10p2)
K07U00R 2007 UR (Q=4.540 AU, arc=22 days, H=23.9 ~56m) from Spahr/Whipple (Oct. 20.17-20p2)
K07T72H 2007 TH72 (arc=18 days, H=24.2 ~49m) from Spahr/Whipple (Oct. 18.28p2)
K07R01H 2007 RH1 (arc=45 days, H=22.6 ~102m) from Spahr/Whipple (Oct. 18.23-24p2)
Observations of almost-small asteroids (21.7<H<=22.0)
K07VI4H 2007 VH184 (Q=4.081 AU, arc=24 days, H=21.9 ~141m) from CSS (Dec. 5.29-32p4)
K07V08H 2007 VH8 (Q=4.308 AU, arc=23 days, H=21.8 ~148m) from Spahr/Whipple (Nov. 17.15p2)
Observations of other objects
K07X03T 2007 XT3 (arc=1 day, H=21.3 ~186m) from Alter Satzberg Obs. (Dec. 5.94-96p4)
K07X03P 2007 XP3 (q=0.274 AU, Q=5.556 AU, arc=1 day, H=18.6 ~645m) from LINEAR (Dec. 5.38-43p5)
K07X03N 2007 XN3 (Q=4.900 AU, arc=2 days, H=20.2 ~309m) from LINEAR (Dec. 5.06-11p4)
K07X00N 2007 XN (arc=2 days, H=19.8 ~371m) from CSS (Dec. 5.42-44p4)
K07W55F 2007 WF55 (arc=7 days, H=19.1 ~513m) from PJMSO (Dec. 5.33-34p6) and Eschenberg Obs. (Dec. 5.81p4)
K07V08L 2007 VL8 (arc=30 days, H=21.2 ~195m) from MLS (Dec. 5.22-24p4)
K07V04Q 2007 VQ4 (arc=32 days, H=16.0 ~2.14 km, q=1.271 AU) from Hamamatsu-Yuto Obs. (Dec. 5.65-68p5)
K07U12M 2007 UM12 (arc=40 days, H=21.6 ~162m) from Spahr/Whipple (Nov. 16.15-16p2)
K07U01X 2007 UX1 (arc=49 days, H=20.5 ~269m) from PJMSO (Dec. 5.31-32p6)
K07T74O 2007 TO74 (arc=34 days, H=19.7 ~389m) from Spahr/Whipple (Oct. 20.25p2 & Nov. 18.11-14p2)
K07T23L 2007 TL23 (q=0.299 AU, arc=23 days, H=21.4 ~178m) from Spahr/Whipple (Oct. 20.13p2)
K07T19J 2007 TJ19 (i=40.6°, arc=29 days, H=20.9 ~224m) from Spahr/Whipple (Oct. 18.25p2)
K07T19H 2007 TH19 (arc=41 days, H=17.8 ~933m) from Spahr/Whipple (Oct. 20.29-31p2 & Nov. 18.20-23p2)
K07T18X 2007 TX18 (arc=57 days, H=17.2 ~1.23 km) from Desert Moon Obs. (Dec. 5.17-21p3)
K07T15G 2007 TG15 (arc=58 days, H=19.6 ~407m) from Capannoli Obs. (Dec. 4.91-93p2)
K07S06P 2007 SP6 (arc=75 days, H=18.2 ~776m) from LONEOS (Dec. 5.29-37p4) and Hamamatsu-Yuto Obs. (Dec. 5.63-64p3 & 5.71-72p3)
K07R17U 2007 RU17 (q=0.356 AU, arc=83 days, H=18.2 ~776m) from Desert Moon Obs. (Dec. 5.06-08p3)
K07P27V 2007 PV27 (arc=73 days, H=20.2 ~309m) from Spahr/Whipple (Oct. 20.08-10p2)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from PJMSO (Dec. 5.28-29p6)
K07M13K 2007 MK13 (arc=167 days, H=20.0 ~339m) from Spacewatch 1.8m (Dec. 5.46-48p3)
K07L32R 2007 LR32 (arc=194 days, H=17.2 ~1.23 km) from LINEAR (Dec. 5.06-11p5)
K07L19Q 2007 LQ19 (Q=4.247 AU, arc=175 days, H=17.4 ~1.12 km) from Desert Moon Obs. (Dec. 5.33-37p3)
K07E88H 2007 EH88 (arc=3 opp, H=19.7 ~389m) from Spahr/Whipple (Nov. 17.49-50p3)
K07B08M 2007 BM8 (q=0.375 AU, arc=3 opp, H=18.5 ~676m) from MLS (Dec. 5.44-45p4)
K06SD4P 2006 SP134 (arc=3 opp, H=16.9 ~1.41 km) from Spahr/Whipple (Oct. 20.25-28p2)
K06K01T 2006 KT1 (arc=3 opp, H=16.6 ~1.62 km) from Spahr/Whipple (Nov. 17.40-43p2)
K06H05X 2006 HX5 (arc=2 opp, H=19.4 ~446m) from Spacewatch 1.8m (Dec. 5.42-43p3)
K06BE8A 2006 BA148 (arc=2 opp, H=18.5 ~676m) from Spacewatch 1.8m (Dec. 5.40-42p3)
K05Y55W 2005 YW55 (arc=4 opp, H=19.4 ~446m) from LONEOS (Dec. 5.21-27p8) and PJMSO (Dec. 5.23-24p5)
K05X77W 2005 XW77 (arc=2 opp, H=20.8 ~234m) from Desert Moon Obs. (Dec. 5.11-14p3)
K05X08K 2005 XK8 (arc=2 opp, H=19.8 ~371m) from Spahr/Whipple (Nov. 17.20-21p4)
K05L39W 2005 LW39 (arc=2 opp, H=20.0 ~339m) from Spahr/Whipple (Nov. 17.16-17p2)
K05C36Z 2005 CZ36 (arc=3 opp, H=17.5 ~1.07 km) from Spacewatch 1.8m (Dec. 5.34p2)
K04S20B 2004 SB20 (arc=2 opp, H=18.6 ~645m) from Spahr/Whipple (Nov. 18.47-49p2)
K04L05Z 2004 LZ5 (Q=4.031 AU, arc=2 opp, H=18.2 ~776m) from Spacewatch 1.8m (Dec. 5.38-39p3 at V=22.5)
K04F64U 2004 FU64 (arc=3 opp, H=18.0 ~851m) from Spahr/Whipple (Nov. 18.29-32p2)
K04BA2V 2004 BV102 (arc=5 opp, H=17.6 ~1.02 km) from LONEOS (Dec. 5.49-53p4)
K04B41H 2004 BH41 (arc=3 opp, H=19.4 ~446m) from Spacewatch 1.8m (Dec. 5.45-46p3)
K03YB7S 2003 YS117 (arc=3 opp, H=18.3 ~741m) from Spahr/Whipple (Oct. 18.44p2)
K03Y94Q 2003 YQ94 (Q=4.292 AU, arc=2 opp, H=17.8 ~933m) from Spahr/Whipple (Nov. 17.07-08p2)
K03B84H 2003 BH84 (arc=2 opp, H=16.9 ~1.41 km) from Hamamatsu-Yuto Obs. (Dec. 5.55-59p8) and Eschenberg Obs. (Dec. 5.75-76p7)
K03A01D 2003 AD1 (arc=3 opp, H=18.2 ~776m) from CSS (Dec. 5.41-43p4) and Desert Moon Obs. (Dec. 5.47-51p3)
K02X04Y 2002 XY4 (i=43.1°, arc=3 opp, H=19.1 ~513m) from LONEOS (Dec. 5.29-37p4)
K02R25Q 2002 RQ25 (arc=2 opp, H=20.4 ~282m) from Spacewatch 1.8m (Dec. 5.39-40p3)
K01QE2H 2001 QH142 (arc=4 opp, H=18.3 ~741m) from Spahr/Whipple (Oct. 20.33-36p2)
K01J01M 2001 JM1 (arc=4 opp, H=19.0 ~537m) from CSS (Dec. 5.28-31p4)
K01F06Z 2001 FZ6 (arc=4 opp, H=18.4 ~708m) from PJMSO (Dec. 5.38-39p5)
K00J10N 2000 JN10 (arc=3 opp, H=17.8 ~933m) from MLS (Dec. 5.23-25p4)
J99A10Q 1999 AQ10 (arc=3 opp, H=20.3 ~295m) from Spahr/Whipple (Oct. 18.45p3)
J97X11V 1997 XV11 (i=44.3°, arc=3 opp, H=18.4 ~708m) from Spahr/Whipple (Nov. 17.09-11p2)
J94A01W 1994 AW1 (arc=3 opp, H=17.4 ~1.12 km) from LONEOS (Dec. 5.39-46p4)
J93T02Q 1993 TQ2 (arc=2 opp, H=20.1 ~323m) from PJMSO (Dec. 5.32-33p6)
H0891 170891 2004 TY16 from PJMSO (Dec. 5.41p1)
G2273 162273 1999 VL12 from Spacewatch 0.9m (Dec. 5.07-10p3) and LONEOS (Dec. 5.12-20p4)
G2173 162173 1999 JU3 from CSS (Dec. 5.08-10p4)
G2142 162142 1998 VR from LINEAR (Dec. 5.24-29p5)
F3591 153591 2001 SN263 from PJMSO (Dec. 5.30-31p5)
F3201 153201 2000 WO107 from Spacewatch 0.9m (Dec. 5.33-37p3) and PJMSO (Dec. 5.40p5)
D8947 138947 2001 BA40 from Spacewatch 0.9m (Dec. 5.39-42p3)
D8852 138852 2000 WN10 from PJMSO (Dec. 5.24-26p6)
96189 96189 1991 NT3 from LINEAR (Dec. 5.38-44p4)
90403 90403 2003 YE45 from LONEOS (Dec. 5.29p1 & 5.34-37p2)
68359 68359 2001 OZ13 from PJMSO (Dec. 5.39-40p5)
68063 68063 2000 YJ66 from Spacewatch 0.9m (Dec. 5.44-48p3)
40267 40267 1999 GJ4 from CSS (Dec. 5.50-52p4)
35107 35107 1991 VH from CSS (Dec. 5.47-49p4)
21374 21374 1997 WS22 from LONEOS (Dec. 5.11-19p4)
18736 18736 1998 NU from PJMSO (Dec. 5.27-28p5)
11405 11405 1999 CV3 from CSS (Dec. 5.50-52p4)
11398 11398 1998 YP11 from CSS (Dec. 5.41-43p4)
08034 8034 Akka (1992 LR) from Spacewatch 0.9m (Dec. 5.08-11p3) and LINEAR (Dec. 5.19-25p5)
07482 7482 1994 PC1 from Desert Moon Obs. (Dec. 5.54p4)
06491 6491 1991 OA from Spahr/Whipple (Oct. 18.30-32p2)
04503 4503 Cleobulus (1989 WM) from LONEOS (Dec. 5.49-54p4)
03553 3553 Mera (1985 JA) from LINEAR (Dec. 5.19-24p5)
03200 3200 Phaethon (1983 TB) from Huelva Obs. (Dec. 1.04-06p3)
01864 1864 Daedalus (1971 FA) from LONEOS (Dec. 5.49-53p4)
01036 1036 Ganymed (1924 TD) from Huelva Obs. (Nov. 30.00-01p3 & Dec. 3.00-02p3)

MPEC 2007-X25 - "03:27 UT" - 2007 RH283

K07RS3H 2007 RH283 (Centaur, q=10.495 AU, Q=21.357 AU, H=8.5 ~67.6 km) from NEAT's Mt. Palomar telescope (2001 Oct. 6.17-19p3, 2002 Aug. 14.45-47p3, 2002 Aug. 15.40-42p3, 2002 Aug. 22.37-40p6, 2002 Sept. 3.27-31p3, 2002 Sept. 11.36-39p3 & 2002 Oct. 3.15-21p5)

Observers on 6 December '07

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

Code	Observer / observatory
`B03`	Alter Satzberg Obs. in Austria, 3 in MPECs 2007-X26, 2007-X28 & 2007-X31 -- 2007 XZ9, 2007 XT3, 2007 XC10
`H55`	Astronomical Research Obs. (ARO) in Illinois, 2 in MPECs 2007-X30 & 2007-X33 -- 2007 XB10, 2005 VT5
`B09`	Capannoli Obs. in Italy, 1 in MPEC 2007-X26 -- 2007 TG15
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2007-X26 & 2007-X27 -- 2007 XY9, 2007 XN, 2007 VH184, 2003 AD1, 2001 JM1, 40267, 35107, 162173, 11405, 11398
`448`	Desert Moon Obs. in New Mexico, 6 in MPEC 2007-X26 -- 2007 TX18, 2007 RU17, 2007 LQ19, 2005 XW77, 2003 AD1, 7482
`151`	Eschenberg Obs. in Switzerland, 2 in MPEC 2007-X26 -- 2007 WF55, 2003 BH84
`595`	Farra d'Isonzo Obs. in Italy, 2 in MPECs 2007-X28 & 2007-X31 -- 2007 XZ9, 2007 XC10
`651`	Grasslands Obs. in Arizona, 4 in MPECs 2007-X27, 2007-X28, 2007-X29 & 2007-X31 -- 2007 XZ9, 2007 XY9, 2007 XC10, 2007 XA10
`J95`	Great Shefford Obs. in England, 2 in MPECs 2007-X28 & 2007-X31 -- 2007 XZ9, 2007 XC10
`379`	Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2007-X26 -- 2007 VQ4, 2007 SP6, 2003 BH84
`J37`	Huelva Obs. in Spain, 2 in MPEC 2007-X26 -- 3200, 1036
`704`	LINEAR in New Mexico, 10 in MPECs 2007-X26, 2007-X27, 2007-X28 & 2007-X29 -- 2007 XZ9, 2007 XY9, 2007 XP3, 2007 XN3, 2007 XA10, 2007 LR32, 96189, 162142, 8034, 3553
`699`	LONEOS in Arizona, 10 in MPEC 2007-X26 -- 2007 SP6, 2005 YW55, 2004 BV102, 2002 XY4, 1994 AW1, 90403, 21374, 162273, 4503, 1864
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2007-X26, 2007-X28 & 2007-X31 -- 2007 XZ9, 2007 XC10, 2007 VL8, 2007 BM8, 2000 JN10
`644`	NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2007-X25 -- 2007 RH283
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 14 in MPEC 2007-X26 -- 2007 WV4, 2007 WF55, 2007 WE55, 2007 UX1, 2007 PU11, 2005 YW55, 2001 FZ6, 1993 TQ2, 68359, 18736, 170891, 153591, 153201, 138852
`473`	Remanzacco Obs. in Italy, 1 in MPEC 2007-X31 -- 2007 XC10
`104`	San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2007-X31 -- 2007 XC10
`691`	Spacewatch 0.9m telescope in Arizona, 7 in MPECs 2007-X26, 2007-X30 & 2007-X32 -- 2007 XD10, 2007 XB10, 68063, 162273, 153201, 138947, 8034
`291`	Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2007-X26, 2007-X30 & 2007-X32 -- 2007 XD10, 2007 XB10, 2007 WY3, 2007 WP3, 2007 WD5, 2007 VJ8, 2007 MK13, 2006 HX5, 2006 BA148, 2005 CZ36, 2004 LZ5, 2004 BH41, 2002 RQ25
`6967`	Tim Spahr via Whipple Obs. in Arizona, 27 in MPEC 2007-X26 -- 2007 WA, 2007 VW83, 2007 VH8, 2007 UY1, 2007 UR, 2007 UM12, 2007 TU24, 2007 TO74, 2007 TL23, 2007 TJ19, 2007 TH72, 2007 TH19, 2007 RH1, 2007 PV27, 2007 EH88, 2006 SP134, 2006 KT1, 2005 XK8, 2005 LW39, 2004 SB20, 2004 FU64, 2003 YS117, 2003 YQ94, 2001 QH142, 1999 AQ10, 1997 XV11, 6491

Impact Risk Monitoring on 6 December '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS at 2355 and JPL at 2356 UTC)
See the CRT page for a list of all objects rated recently as risks.
Note that the time horizon for JPL is 100 years from today and for NEODyS is now 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

2007 XD10	JPL Sentry	2101	2010-2086	32	6.5e-09	-4.98	-5.25	0	JPL: "Analysis based on 8 observations spanning .87834 days (2007-Dec-05.44337 to 2007-Dec-06.32171)." Diameter approximately 0.274 km. from mean, weighted H=20.5.

2007 XZ9	JPL Sentry	2356	2056-2089	4	1.6e-06	-5.68	-6.01	0	JPL: "Analysis based on 28 observations spanning 2.1041 days (2007-Dec-04.19408 to 2007-Dec-06.29819)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

2007 WP3	JPL Sentry	2356	2098-2106	11	5.5e-06	-4.81	-5.18	0	JPL: "Analysis based on 57 observations spanning 16.940 days (2007-Nov-18.26457 to 2007-Dec-05.2041)." Diameter approximately 0.067 km. from mean, weighted H=23.5.

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 6 December '07

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

2356	Noted that JPL Sentry has updated its 2007 WP3 risk assessment - see above Noted that JPL Sentry has posted 2007 XZ9 as an impact risk - see above
2101	Noted that JPL Sentry has posted 2007 XD10 as an impact risk - see above
1937	Grabbed MPEC 2007-X33 - 2005 VT5 - see above
1833	Grabbed MPEC 2007-X28 - 2007 XZ9 - see above Grabbed MPEC 2007-X29 - 2007 XA10 - see above Grabbed MPEC 2007-X30 - 2007 XB10 - see above Grabbed MPEC 2007-X31 - 2007 XC10 - see above Grabbed MPEC 2007-X32 - 2007 XD10 - see above
1809	Grabbed MPEC 2007-X27 - 2007 XY9 - see above
1706	Grabbed MPEC 2007-X26 - Daily Orbit Update - see above
0401	Grabbed MPEC 2007-X25 - 2007 RH283 - see above

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