4 Dec '07 Tracking News

Contents on 4 December '07

IAU Minor Planet Center
- NEOCP Activity -- eight listings: 6 new, 2 updated
- New MPECs -- four MPECs
- Observers -- fourteen observing facilities
Impact Risk Monitoring -- four 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 4 December '07

The MPC's NEO Confirmation Page has 8 listings: 6 new, 2 updated

When last checked at 2346 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of twelve 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 4 December '07

Minor Planet Electronic Circulars

As of last check at 2346 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2007-X15 time-stamped "07:10 UT" - Daily Orbit Update - see below
MPEC 2007-X16 time-stamped "13:17 UT" - 2007 XN - see below
MPEC 2007-X17 time-stamped "13:56 UT" - 2007 XO - see below
MPEC 2007-X18 time-stamped "14:03 UT" - 2007 XP

MPEC 2007-X18 - "14:03 UT" - 2007 XP

K07X00P 2007 XP (small asteroid, Earth MOID=9.0 LD, H=23.3 ~74m) was discovered at 0954 UT on 4 Dec. by the Catalina Sky Survey (CSS), which observed it at Dec. 4.41-53p13.

MPEC 2007-X17 - "13:56 UT" - 2007 XO

K07X00O 2007 XO (small asteroid, Earth MOID=3.8 LD, H=25.6 ~26m) was discovered at 0630 UT on 4 Dec. by the CSS, which observed it at Dec. 4.27-33p8 and 4.44p4. The discovery was confirmed by the Spacewatch 1.8m telescope (Dec. 4.44-45p3). This object will be coming within ten lunar distances (LD) of Earth, reaching 6.1 LD on 7 Dec.

MPEC 2007-X16 - "13:17 UT" - 2007 XN

K07X00N 2007 XN (H=19.8 ~371m) was discovered at 1017 UT on 3 Dec. by the CSS, which observed it at Dec. 3.43-53p12, 4.47-49p4, and 4.53-54p4. The discovery was confirmed by Vallemare di Borbona Obs. (Dec. 4.11p5) and Tenagra II Obs. (Dec. 4.52p3).

<< DOU on 4 Dec. '07 >> MPEC 2007-X15 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K07W03Y 2007 WY3 (Q=4.920 AU, arc=15 days, H=18.2 ~776m) from Spacewatch 1.8m (Dec. 3.49-50p3)
K07W03P 2007 WP3 (small asteroid, arc=15 days, H=23.5 ~68m) from Spacewatch 1.8m (Dec. 3.31-32p3)
K07VI4K 2007 VK184 (almost small, arc=22 days, H=22.0 ~135m) from Spacewatch 1.8m (Dec. 3.25-26p3 & 4.14-15p3)
K07T24U 2007 TU24 (arc=54 days, H=20.1 ~323m) from Spacewatch 1.8m (Dec. 4.09p1 & 4.13p1)
Observations of recently (no longer) risk-listed objects
K07W04V 2007 WV4 (i=38.3°, arc=14 days, H=19.1 ~513m) from CSS (Dec. 3.32-33p3)
K07W03V 2007 WV3 (arc=15 days, H=19.5 ~426m) from Desert Moon Obs. (Dec. 3.35-39p3)
K07VI9G 2007 VG189 (arc=20 days, H=19.2 ~490m) from Spacewatch 1.8m (Dec. 3.36-37p3)
K07U01Y 2007 UY1 (small asteroid, arc=44 days, H=22.8 ~93m) from Astronomical Research Obs. (ARO) (Dec. 1.02-05p3 at V=22.1-4)
Observations of small asteroids (H>22.0)
K07W04T 2007 WT4 (arc=15 days, H=22.5 ~107m) from Jornada Obs. (Dec. 4.18-21p3)
K07V83U 2007 VU83 (arc=24 days, H=25.3 ~29m) from ARO (Dec. 1.21-24p3 at V=22.1-2)
Observations of other objects
K07W55F 2007 WF55 (arc=4 days, H=19.0 ~537m) from Petit Jean Mtn. South Obs. (PJMSO) (Dec. 3.23-25p8) and Jim Young via Table Mtn. Obs. (Dec. 3.34-35p4)
K07W05B 2007 WB5 (arc=13 days, H=18.9 ~562m) from Desert Moon Obs. (Dec. 3.12-19p3)
K07W04W 2007 WW4 (arc=14 days, H=19.6 ~407m) from Desert Moon Obs. (Dec. 3.22-24p4)
K07W03N 2007 WN3 (Q=4.113 AU, arc=15 days, H=21.4 ~178m) from ARO (Dec. 1.06-07p3) and Spacewatch 1.8m (Dec. 3.29-30p3)
K07W00B 2007 WB (arc=18 days, H=18.8 ~589m) from Desert Moon Obs. (Dec. 3.26-30p3) and Jornada Obs. (Dec. 4.16-17p3)
K07VI8A 2007 VA188 (Q=4.886 AU, arc=21 days, H=19.5 ~426m) from Desert Moon Obs. (Dec. 3.05-09p3) and LINEAR (Dec. 3.15-18p4)
K07V03N 2007 VN3 (arc=30 days, H=21.4 ~178m) from Spacewatch 1.8m (Dec. 3.27-28p3)
K07U06S 2007 US6 (arc=3 opp, H=18.3 ~741m) from LINEAR (Dec. 3.12-17p5)
K07U06B 2007 UB6 (arc=45 days, H=19.7 ~389m) from CSS (Dec. 3.27-29p4)
K07U03W 2007 UW3 (arc=43 days, H=19.4 ~446m) from ARO (Dec. 1.30-31p3)
K07U02A 2007 UA2 (arc=58 days, H=21.0 ~214m) from Jornada Obs. (Dec. 4.12-14p3)
K07U01X 2007 UX1 (arc=47 days, H=20.5 ~269m) from CSS (Dec. 3.31-33p4)
K07T15G 2007 TG15 (arc=57 days, H=19.6 ~407m) from LINEAR (Dec. 3.25-30p5) and New Millennium Obs. (Dec. 3.81-85p6)
K07S11E 2007 SE11 (i=48.3°, arc=74 days, H=17.8 ~933m) from New Millennium Obs. (Dec. 3.79-83p3)
K07S06P 2007 SP6 (arc=73 days, H=18.2 ~776m) from Desert Moon Obs. (Dec. 3.32-33p3) and LINEAR (Dec. 3.38-43p5)
K07S00J 2007 SJ (arc=2 opp, H=16.5 ~1.70 km) from Spacewatch 1.8m (Dec. 4.12-13p3)
K07R09V 2007 RV9 (arc=85 days, H=20.1 ~323m) from Spacewatch 1.8m (Dec. 4.10p3)
K07P11U 2007 PU11 (Q=4.384 AU, arc=3 opp, H=16.3 ~1.86 km) from Hamamatsu-Yuto Obs. (Dec. 3.58-60p3)
K07L32R 2007 LR32 (arc=192 days, H=17.2 ~1.23 km) from LINEAR (Dec. 3.19-25p5)
K05YC8Y 2005 YY128 (arc=3 opp, H=18.3 ~741m) from Spacewatch 1.8m (Dec. 3.44p2)
K05Y55W 2005 YW55 (arc=4 opp, H=19.4 ~446m) from CSS (Dec. 3.27-29p4)
K05X01D 2005 XD1 (arc=2 opp, H=19.2 ~490m) from Young/Table Mtn. (Dec. 3.25-28p3)
K05U00B 2005 UB (arc=3 opp, H=16.6 ~1.62 km) from Desert Moon Obs. (Dec. 3.45p1 & 3.49p1)
K05T49F 2005 TF49 (arc=2 opp, H=19.1 ~513m) from LINEAR (Dec. 3.07-12p4)
K05O01V 2005 OV1 (arc=2 opp, H=21.7 ~155m) from Spacewatch 1.8m (Dec. 3.45-46p3)
K03YD7M 2003 YM137 (Q=4.390 AU, arc=3 opp, H=18.7 ~616m) from Spacewatch 1.8m (Dec. 3.38-39p3)
K03B84H 2003 BH84 (arc=2 opp, H=16.8 ~1.48 km) from Hamamatsu-Yuto Obs. (Dec. 3.53-57p5) and New Millennium Obs. (Dec. 3.80-85p5)
K02X04Y 2002 XY4 (i=43.1°, arc=3 opp, H=19.0 ~537m) from LINEAR (Dec. 3.44-49p5)
K02G08K 2002 GK8 (i=39.0°, arc=2 opp, H=19.7 ~389m) from Jornada Obs. (Dec. 4.05-09p3)
J99V11P 1999 VP11 (arc=5 opp, H=18.7 ~616m) from Spacewatch 1.8m (Dec. 3.34-35p3)
J99A10Q 1999 AQ10 (arc=3 opp, H=20.3 ~295m) from New Millennium Obs. (Dec. 3.80-84p6)
J98X09C 1998 XC9 (Q=4.212 AU, arc=3 opp, H=18.1 ~812m) from LINEAR (Dec. 3.13-18p3)
J98V00O 1998 VO (arc=3 opp, H=20.4 ~282m) from Spacewatch 1.8m (Dec. 3.39-40p3)
J96T11Y 1996 TY11 (arc=6 opp, H=19.4 ~446m) from New Millennium Obs. (Dec. 3.82-86p6)
G2004 162004 1991 VE from CSS (Dec. 3.26-29p4)
E3678 143678 2003 SA224 from LINEAR (Dec. 3.32-37p5) and New Millennium Obs. (Dec. 3.80-84p6)
D8971 138971 2001 CB21 from LINEAR (Dec. 3.06-11p4)
D8852 138852 2000 WN10 from LINEAR (Dec. 3.26-31p5)
D7084 137084 1998 XS16 from LINEAR (Dec. 3.25-29p4) and New Millennium Obs. (Dec. 3.79-83p6)
96189 96189 1991 NT3 from CSS (Dec. 3.38-41p4)
90403 90403 2003 YE45 from LINEAR (Dec. 3.45-50p5)
86324 86324 1999 WA2 from New Millennium Obs. (Dec. 3.78-82p6)
66272 66272 1999 JW6 from Goodricke-Pigott Obs. (Dec. 3.20-23p3)
65706 65706 1992 NA from LINEAR (Dec. 3.45-50p5)
53426 53426 1999 SL5 from LINEAR (Dec. 3.19-24p4)
25916 25916 2001 CP44 from the Spacewatch 0.9m telescope (Dec. 3.42-45p3)
20826 20826 2000 UV13 from New Millennium Obs. (Dec. 3.79-83p6)
16834 16834 1997 WU22 from LINEAR (Dec. 3.06-11p4)
04954 4954 Eric (1990 SQ) from LINEAR (Dec. 3.13-18p5)
04450 4450 Pan (1987 SY) from CSS (Dec. 3.38-42p4)
03553 3553 Mera (1985 JA) from New Millennium Obs. (Dec. 3.81-85p6)
03288 3288 Seleucus (1982 DV) from CSS (Dec. 3.43-47p4)

Observers on 4 December '07

Fourteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 4 in MPEC 2007-X15 -- 2007 WN3, 2007 VU83, 2007 UY1, 2007 UW3
`703`	Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2007-X15, 2007-X16, 2007-X17 & 2007-X18 -- 2007 XP, 2007 XO, 2007 XN, 2007 WV4, 2007 UX1, 2007 UB6, 2005 YW55, 96189, 162004, 4450, 3288
`448`	Desert Moon Obs. in New Mexico, 7 in MPEC 2007-X15 -- 2007 WW4, 2007 WV3, 2007 WB5, 2007 WB, 2007 VA188, 2007 SP6, 2005 UB
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2007-X15 -- 66272
`379`	Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2007-X15 -- 2007 PU11, 2003 BH84
`715`	Jornada Obs. in New Mexico, 4 in MPEC 2007-X15 -- 2007 WT4, 2007 WB, 2007 UA2, 2002 GK8
`704`	LINEAR in New Mexico, 17 in MPEC 2007-X15 -- 2007 VA188, 2007 US6, 2007 TG15, 2007 SP6, 2007 LR32, 2005 TF49, 2002 XY4, 1998 XC9, 90403, 65706, 53426, 16834, 143678, 138971, 138852, 137084, 4954
`A24`	New Millennium Obs. in Italy, 10 in MPEC 2007-X15 -- 2007 TG15, 2007 SE11, 2003 BH84, 1999 AQ10, 1996 TY11, 86324, 20826, 143678, 137084, 3553
`H45`	Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2007-X15 -- 2007 WF55
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2007-X15 -- 25916
`291`	Spacewatch 1.8m telescope in Arizona, 15 in MPECs 2007-X15 & 2007-X17 -- 2007 XO, 2007 WY3, 2007 WP3, 2007 WN3, 2007 VN3, 2007 VK184, 2007 VG189, 2007 TU24, 2007 SJ, 2007 RV9, 2005 YY128, 2005 OV1, 2003 YM137, 1999 VP11, 1998 VO
`6735`	Jim Young via Table Mtn. Obs. in southern California, 2 in MPEC 2007-X15 -- 2007 WF55, 2005 XD1
`926`	Tenagra II Obs. in Arizona, 1 in MPEC 2007-X16 -- 2007 XN
`A55`	Vallemare di Borbona Obs. in Italy, 1 in MPEC 2007-X16 -- 2007 XN

Impact Risk Monitoring on 4 December '07

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2346 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	1416	2101	1	2.0e-07	-3.45	-3.45	0	JPL: "Analysis based on 28 observations spanning 15.060 days (2007-Nov-18.44048 to 2007-Dec-03.50039)." Diameter approximately 0.780 km. from mean, weighted H=18.2.
2007 WY3	NEODyS	1416	R E M O V E D

2007 WP3	JPL Sentry	1416	2098-2106	11	7.9e-06	-4.65	-5.08	0	JPL: "Analysis based on 54 observations spanning 15.051 days (2007-Nov-18.26457 to 2007-Dec-03.31559)." Diameter approximately 0.067 km. from mean, weighted H=23.5.

2007 VK184	JPL Sentry	1416	2046-2062	15	7.2e-05	-2.52	-2.55	0	JPL: "Analysis based on 80 observations spanning 22.009 days (2007-Nov-12.13904 to 2007-Dec-04.14815)." Diameter approximately 0.130 km. from mean, weighted H=22.0.
2007 VK184	NEODyS	1416	2033-2074	30	7.01e-05	-2.53	-2.56	0	NEODyS: "Based on 80 optical observations (of which 0 are rejected as outliers) from 2007/11/12.140 to 2007/12/04.149."

2007 TU24	JPL Sentry	1416	R E M O V E D						JPL: Risk listing removed at 1405 UTC.

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 4 December '07

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

1416

Noted that JPL Sentry has removed 2007 TU24 as an impact risk - see above
Noted that JPL Sentry has updated its 2007 VK184 risk assessment - see above
Noted that NEODyS has updated its 2007 VK184 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 WY3 risk assessment - see above
Noted that NEODyS has removed 2007 WY3 as an impact risk - see above
Grabbed MPEC 2007-X15 - Daily Orbit Update - see above
Grabbed MPEC 2007-X16 - 2007 XN - see above
Grabbed MPEC 2007-X17 - 2007 XO - see above
Grabbed MPEC 2007-X18 - 2007 XP - see above

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