21 Nov '07 Tracking News

Contents on 21 November '07

IAU Minor Planet Center
- NEOCP Activity -- eleven listings: 7 new, 4 updated
- New MPECs -- ten MPECs
- Observers -- thirteen observing facilities
Impact Risk Monitoring -- eight objects reported
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 21 November '07

The MPC's NEO Confirmation Page has 11 listings: 7 new, 4 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had seven new and four updated listings. Of these, ten were "one nighters." So far The Tracking News has counted a total of 32 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 21 November '07

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been ten MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-W43 time-stamped "07:11 UT" - Daily Orbit Update - see below
MPEC 2007-W44 time-stamped "21:30 UT" - 2007 WT4 - see below
MPEC 2007-W45 time-stamped "21:34 UT" - 2007 WU4 - see below
MPEC 2007-W46 time-stamped "21:37 UT" - 2007 WV4 - see below
MPEC 2007-W47 time-stamped "21:41 UT" - 2007 WW4 - see below
MPEC 2007-W48 time-stamped "21:44 UT" - 2007 WX4 - see below
MPEC 2007-W49 time-stamped "21:47 UT" - 2007 WZ4 - see below
MPEC 2007-W50 time-stamped "21:51 UT" - 2007 WB5 - see below
MPEC 2007-W51 time-stamped "21:54 UT" - 2007 WC5 - see below
MPEC 2007-W52 time-stamped "22:29 UT" - 2007 WD5

MPEC 2007-W52 - "22:29 UT" - 2007 WD5

K07W05D 2007 WD5 (small asteroid, Q=4.156 AU, H=24.3 ~47m) was discovered at 0742 UT on 20 Nov. by the Mt. Lemmon Survey (MLS), which observed it at Nov. 20.32-37p7 and 21.41p4. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Nov. 20.42-43p4).

MPEC 2007-W51 - "21:54 UT" - 2007 WC5

K07W05C 2007 WC5 (small asteroid, Earth MOID=6.0 LD, H=27.3 ~12m) was discovered at 0737 UT on 20 Nov. by the MLS, which observed it at Nov. 20.32-37p8, 20.42p2, and 21.46-47p4. This object was within ten lunar distances (LD) of Earth, reaching 7.7 LD on 16 Nov.

MPEC 2007-W50 - "21:51 UT" - 2007 WB5

K07W05B 2007 WB5 (H=18.6 ~645m) was discovered at 0518 UT on 20 Nov. by the MLS, which observed it at Nov. 20.22-27p8, 21.22-23p4, and 21.42-43p4.

MPEC 2007-W49 - "21:47 UT" - 2007 WZ4

K07W04Z 2007 WZ4 (small asteroid, Earth MOID=7.1 LD, H=24.2 ~49m) was discovered at 0510 UT on 20 Nov. by the Catalina Sky Survey (CSS), which observed it at Nov. 20.22-27p7, 20.36-39p8, and 21.20-21p4. The discovery was confirmed by MLS (Nov. 20.24-26p4), MRO (Nov. 20.39-40p6), Mt. John Obs. (Nov. 20.47-48p5), Jim Young via Table Mtn. Obs. (Nov. 21.36-38p4), and Shenton Park Obs. (Nov. 21.62p2).

MPEC 2007-W48 - "21:44 UT" - 2007 WX4

K07W04X 2007 WX4 (H=20.0 ~339m) was discovered at 0153 UT on 20 Nov. by the MLS, which observed it at Nov. 20.08-15p8, 21.10p4, and 21.25p4.

MPEC 2007-W47 - "21:41 UT" - 2007 WW4

K07W04W 2007 WW4 (H=19.5 ~426m) was discovered at 1511 UT on 19 Nov. by the Siding Spring Survey (SSS), which observed it at Nov. 19.63-66p3, 19.71-75p2, 20.41p1, 20.60p1, and 20.74p1. The discovery was confirmed by Young/Table Mtn. (Nov. 20.40-41p4), Mt. John Obs. (Nov. 20.49-51p4), and Shenton Park Obs. (Nov. 21.65p3).

MPEC 2007-W46 - "21:37 UT" - 2007 WV4

K07W04V 2007 WV4 (i=39.1°, Earth MOID=2.6 LD, H=19.2 ~490m) was discovered at 0926 UT on 19 Nov. by the Spacewatch 0.9m telescope, which observed it at Nov. 19.39-43p3 and 21.41-42p3. The discovery was confirmed by the Spacewatch 1.8m telescope (Nov. 19.47-48p3 & 20.22-24p3).

MPEC 2007-W45 - "21:34 UT" - 2007 WU4

K07W04U 2007 WU4 (H=18.9 ~562m) was discovered at 0825 UT on 19 Nov. by the Spacewatch 0.9m, which observed it at Nov. 19.35-39p3. The discovery was confirmed by Spacewatch 1.8m (Nov. 19.42p3, 19.49-50p3 & 20.21-22p2), Kanab Obs. (Nov. 20.35-38p2), and MLS (Nov. 21.26-27p4).

MPEC 2007-W44 - "21:30 UT" - 2007 WT4

K07W04T 2007 WT4 (small asteroid, H=22.5 ~107m) was discovered at 0439 UT on 19 Nov. by the Spacewatch 0.9m, which observed it at Nov. 19.19-23p3. The discovery was confirmed by Spacewatch 1.8m (Nov. 19.28-29p3, 19.38-39p3 & 20.17p3) and MLS (Nov. 21.28-29p4).

<< DOU on 21 Nov. '07 >> MPEC 2007-W43 - "07:11 UT" - Daily Orbit Update

Observations of risk-listed objects
K07W03Y 2007 WY3 (Q=4.713 AU, arc=2 days, H=18.1 ~812m) from MLS (Nov. 20.40-41p4)
K07W03V 2007 WV3 (arc=2 days, H=19.2 ~490m) from Spacewatch 1.8m (Nov. 20.37-38p3)
K07W03T 2007 WT3 (small asteroid, Q=4.084 AU, arc=2 days, H=24.1 ~51m) from Spacewatch 1.8m (Nov. 20.30-31p3)
K07W03P 2007 WP3 (small asteroid, arc=2 days, H=23.5 ~68m) from Spacewatch 1.8m (Nov. 20.29-30p3)
K07VO3N 2007 VN243 (small asteroid, arc=5 days, H=22.1 ~129m) from Spacewatch 1.8m (Nov. 20.26p3)
K07VJ1E 2007 VE191 (small asteroid, arc=5 days, H=23.8 ~59m) from Spacewatch 1.8m (Nov. 20.11-12p3) and MLS (Nov. 20.16-17p4)
K07VI9H 2007 VH189 (small asteroid, Q=4.737 AU, arc=6 days, H=23.2 ~78m) from Spacewatch 1.8m (Nov. 20.19-20p3)
K07VI4K 2007 VK184 (almost small, arc=7 days, H=22.0 ~135m) from Lumezzane Obs. (Nov. 18.89-90p3)
Observations of recently (no longer) risk-listed objects
K07W00A 2007 WA (small asteroid, arc=4 days, H=24.7 ~39m) from MLS (Nov. 20.35p3)
K07VO3P 2007 VP243 (arc=5 days, H=21.4 ~178m) from Spacewatch 1.8m (Nov. 20.13p2)
K07VJ1B 2007 VB191 (small asteroid, arc=6 days, H=25.1 ~32m) from Spacewatch 0.9m (Nov. 18.19-22p3 & 20.33-37p3), LINEAR (Nov. 20.14-19p5), and MLS (Nov. 20.36-37p4)
K07VI9G 2007 VG189 (arc=7 days, H=19.1 ~513m) from Spacewatch 0.9m (Nov. 17.39-42p3) and Spacewatch 1.8m (Nov. 20.27-28p3)
K07V12D 2007 VD12 (arc=15 days, H=20.0 ~339m) from CSS (Nov. 20.37-39p4)
K07V03H 2007 VH3 (small asteroid, arc=18 days, H=22.4 ~112m) from Desert Moon Obs. (Nov. 20.37-43p3)
Observations of small asteroids (H>22.0)
K07W03K 2007 WK3 (arc=3 days, H=26.2 ~19m) from MLS (Nov. 20.27-29p4)
K07W03J 2007 WJ3 (arc=4 days, H=26.2 ~19m) from MLS (Nov. 20.24-26p4)
K07V83U 2007 VU83 (arc=13 days, H=25.3 ~29m) from MLS (Nov. 20.32-34p4)
K07V29R 2007 VR29 (arc=14 days, H=24.5 ~43m) from Mt. John Obs. (Nov. 20.53p3)
K07V06V 2007 VV6 (arc=16 days, H=24.8 ~37m) from Spacewatch 0.9m (Nov. 19.18p1)
K07T68V 2007 TV68 (Q=4.091 AU, arc=38 days, H=23.0 ~85m) from Desert Moon Obs. (Nov. 20.27-33p3)
K07S01S 2007 SS1 (arc=62 days, H=23.6 ~65m) from Spacewatch 0.9m (Nov. 19.24-27p3 & 20.27-31p2)
Observations of other objects
K07V07Y 2007 VY7 (arc=40 days, H=19.5 ~426m) from Desert Moon Obs. (Nov. 20.11-12p3)
K07V07X 2007 VX7 (arc=15 days, H=19.5 ~426m) from Lumezzane Obs. (Nov. 18.87-88p4)
K07V06T 2007 VT6 (arc=16 days, H=20.3 ~295m) from Lumezzane Obs. (Nov. 18.91-92p4)
K07V04Q 2007 VQ4 (Q=4.006 AU, arc=17 days, H=16.0 ~2.14 km, q=1.272 AU) from Desert Moon Obs. (Nov. 20.48-49p3)
K07T66E 2007 TE66 (arc=39 days, H=21.3 ~186m) from Desert Moon Obs. (Nov. 20.14-18p3)
K07G03S 2007 GS3 (arc=2 opp, H=19.4 ~446m) from Lumezzane Obs. (Nov. 19.06-07p4)
K05X80L 2005 XL80 (arc=2 opp, H=18.1 ~812m) from MLS (Nov. 20.28-29p4)
K05S71A 2005 SA71 (arc=2 opp, H=18.8 ~589m) from Lumezzane Obs. (Nov. 18.82-83p4)
K04BA2V 2004 BV102 (arc=5 opp, H=17.6 ~1.02 km) from CSS (Nov. 20.48-51p4)
K03K16W 2003 KW16 (i=38.4°, arc=3 opp, H=20.1 ~323m) from Spacewatch 0.9m (Nov. 20.45-47p2)
K01H15W 2001 HW15 (arc=3 opp, H=20.2 ~309m) from Spacewatch 0.9m (Nov. 19.18-22p3)
J96F03G 1996 FG3 (arc=7 opp, H=18.2 ~776m) from MLS (Nov. 20.48-50p4 at V=22.4)
J93V00D 1993 VD (arc=4 opp, H=21.6 ~162m) from Spacewatch 0.9m (Nov. 20.38-42p3)
J93T02Q 1993 TQ2 (arc=2 opp, H=20.0 ~339m) from Lumezzane Obs. (Nov. 19.02-03p4)
G4184 164184 2004 BF68 from Spacewatch 0.9m (Nov. 20.46-48p2)
G3051 163051 2001 YJ4 from Spacewatch 0.9m (Nov. 19.07-11p3)
G2004 162004 1991 VE from CSS (Nov. 20.23-24p3)
F3271 153271 2001 CL42 from Lumezzane Obs. (Nov. 18.86-87p4)
F2558 152558 1990 SA from Desert Moon Obs. (Nov. 20.06-09p3)
E0333 140333 2001 TD2 from MLS (Nov. 20.47-48p4)
D6617 136617 1994 CC from LINEAR (Nov. 20.15-19p4 & 20.26-31p5)
66146 66146 1998 TU3 from SSS (Nov. 20.46-47p4)
21374 21374 1997 WS22 from MLS (Nov. 20.24-26p4)
19764 19764 2000 NF5 from Spacewatch 0.9m (Nov. 18.24-27p3)
18736 18736 1998 NU from Lumezzane Obs. (Nov. 19.03-04p4) and LINEAR (Nov. 20.13-18p5)
07482 7482 1994 PC1 from SSS (Nov. 20.66-69p4)
04503 4503 Cleobulus (1989 WM) from LINEAR (Nov. 20.45-50p5)
03553 3553 Mera (1985 JA) from LINEAR (Nov. 20.07-12p5)
02101 2101 Adonis (1936 CA) from MLS (Nov. 20.50-52p4)
01862 1862 Apollo (1932 HA) from LINEAR (Nov. 20.38-43p5)

Observers on 21 November '07

Thirteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`703`	Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2007-W43 & 2007-W49 -- 2007 WZ4, 2007 VD12, 2004 BV102, 162004
`448`	Desert Moon Obs. in New Mexico, 6 in MPEC 2007-W43 -- 2007 VY7, 2007 VQ4, 2007 VH3, 2007 TV68, 2007 TE66, 152558
`682`	Kanab Obs. in Utah, 1 in MPEC 2007-W45 -- 2007 WU4
`704`	LINEAR in New Mexico, 6 in MPEC 2007-W43 -- 2007 VB191, 18736, 136617, 4503, 3553, 1862
`130`	Lumezzane Obs. in Italy, 8 in MPEC 2007-W43 -- 2007 VX7, 2007 VT6, 2007 VK184, 2007 GS3, 2005 SA71, 1993 TQ2, 18736, 153271
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2007-W49 & 2007-W52 -- 2007 WZ4, 2007 WD5
`474`	Mt. John Obs. in New Zealand, 3 in MPECs 2007-W43, 2007-W47 & 2007-W49 -- 2007 WZ4, 2007 WW4, 2007 VR29
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 19 in MPECs 2007-W43, 2007-W44, 2007-W45, 2007-W48, 2007-W49, 2007-W50, 2007-W51 & 2007-W52 -- 2007 WZ4, 2007 WY3, 2007 WX4, 2007 WU4, 2007 WT4, 2007 WK3, 2007 WJ3, 2007 WD5, 2007 WC5, 2007 WB5, 2007 WA, 2007 VU83, 2007 VE191, 2007 VB191, 2005 XL80, 1996 FG3, 21374, 140333, 2101
`D21`	Shenton Park Obs. in Western Australia, 2 in MPECs 2007-W47 & 2007-W49 -- 2007 WZ4, 2007 WW4
`E12`	Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2007-W43 & 2007-W47 -- 2007 WW4, 66146, 7482
`691`	Spacewatch 0.9m telescope in Arizona, 13 in MPECs 2007-W43, 2007-W44, 2007-W45 & 2007-W46 -- 2007 WV4, 2007 WU4, 2007 WT4, 2007 VV6, 2007 VG189, 2007 VB191, 2007 SS1, 2003 KW16, 2001 HW15, 1993 VD, 19764, 164184, 163051
`291`	Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2007-W43, 2007-W44, 2007-W45 & 2007-W46 -- 2007 WV4, 2007 WV3, 2007 WU4, 2007 WT4, 2007 WT3, 2007 WP3, 2007 VP243, 2007 VN243, 2007 VH189, 2007 VG189, 2007 VE191
`6735`	Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2007-W47 & 2007-W49 -- 2007 WZ4, 2007 WW4

Impact Risk Monitoring on 21 November '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2354 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 WY3	JPL Sentry	1702	2016-2106	75	2.3e-08	-4.08	-5.05	0	JPL: "Analysis based on 21 observations spanning 1.9722 days (2007-Nov-18.44048 to 2007-Nov-20.41271)." Diameter approximately 0.739 km. from mean, weighted H=18.3.
2007 WY3	NEODyS	1357	2014-2090	91	1.89e-08	-4.08	-5.19	0	NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2007/11/18.441 to 2007/11/20.413."

2007 WV3	JPL Sentry	1902	R E M O V E D						JPL: Risk listing removed at 1737 UTC.
2007 WV3	NEODyS	1356	R E M O V E D

2007 WT3	JPL Sentry	1356	2101	1	3.5e-07	-6.06	-6.06	0	JPL: "Analysis based on 15 observations spanning 2.0105 days (2007-Nov-18.29804 to 2007-Nov-20.30856)." Diameter approximately 0.051 km. from mean, weighted H=24.1.

2007 WP3	JPL Sentry	1356	2104-2107	13	6.3e-06	-4.75	-5.25	0	JPL: "Analysis based on 41 observations spanning 2.0309 days (2007-Nov-18.26457 to 2007-Nov-20.29549)." Diameter approximately 0.067 km. from mean, weighted H=23.5.

2007 VN243	JPL Sentry	1430	2067-2086	3	7.0e-07	-4.76	-4.88	0	JPL: "Analysis based on 22 observations spanning 5.0194 days (2007-Nov-15.24381 to 2007-Nov-20.26323)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
2007 VN243	NEODyS	1357	2048-2081	6	7.59e-07	-4.72	-4.88	0	NEODyS: "Based on 22 optical observations (of which 0 are rejected as outliers) from 2007/11/15.245 to 2007/11/20.264."

2007 VE191	NEODyS	1357	2015	1	3.6e-05	-2.93	-2.93	0	NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2007/11/15.267 to 2007/11/20.173."
2007 VE191	JPL Sentry	1356	2015	1	3.6e-05	-2.94	-2.94	0	JPL: "Analysis based on 41 observations spanning 4.9064 days (2007-Nov-15.26603 to 2007-Nov-20.17243)." Diameter approximately 0.058 km. from mean, weighted H=23.8.

2007 VH189	NEODyS	1357	2013-2054	18	3.72e-07	-4.86	-5.01	0	NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2007/11/14.352 to 2007/11/20.202."
2007 VH189	JPL Sentry	1356	2013-2049	15	3.3e-07	-4.94	-5.17	0	JPL: "Analysis based on 23 observations spanning 5.8502 days (2007-Nov-14.35096 to 2007-Nov-20.20114)." Diameter approximately 0.073 km. from mean, weighted H=23.3.

2007 VK184	JPL Sentry	1702	2035-2062	22	6.1e-05	-2.64	-3.02	0	JPL: "Analysis based on 64 observations spanning 7.1116 days (2007-Nov-12.13904 to 2007-Nov-19.25067)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
2007 VK184	NEODyS	1357	2041-2062	28	5.99e-05	-2.65	-3.03	0	NEODyS: "Based on 64 optical observations (of which 0 are rejected as outliers) from 2007/11/12.140 to 2007/11/19.251."

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 21 November '07

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

2238	Grabbed MPEC 2007-W52 - 2007 WD5 - see above
2208	Grabbed MPEC 2007-W47 - 2007 WW4 - see above Grabbed MPEC 2007-W49 - 2007 WZ4 - see above Grabbed MPEC 2007-W50 - 2007 WB5 - see above Grabbed MPEC 2007-W51 - 2007 WC5 - see above
2207	Grabbed MPEC 2007-W46 - 2007 WV4 - see above Grabbed MPEC 2007-W48 - 2007 WX4 - see above
2137	Grabbed MPEC 2007-W44 - 2007 WT4 - see above Grabbed MPEC 2007-W45 - 2007 WU4 - see above
1902	Noted that JPL Sentry has removed 2007 WV3 as an impact risk - see above
1702	Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above Noted that JPL Sentry has posted 2007 WY3 as an impact risk - see above
1430	Noted that JPL Sentry has updated its 2007 VN243 risk assessment - see above
1357	Noted that NEODyS has updated its 2007 VE191 risk assessment - see above Noted that NEODyS has updated its 2007 VH189 risk assessment - see above Noted that NEODyS has updated its 2007 VK184 risk assessment - see above Noted that NEODyS has updated its 2007 VN243 risk assessment - see above Grabbed MPEC 2007-W43 - Daily Orbit Update - see above
1356	Noted that JPL Sentry has updated its 2007 VE191 risk assessment - see above Noted that JPL Sentry has updated its 2007 VH189 risk assessment - see above Noted that JPL Sentry has updated its 2007 WP3 risk assessment - see above Noted that JPL Sentry has updated its 2007 WT3 risk assessment - see above Noted that NEODyS has removed 2007 WV3 as an impact risk - see above Noted that NEODyS has posted 2007 WY3 as an impact risk - see above

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