2008-12-02 Tracking News

Contents on 2 December '08

IAU Minor Planet Center
- NEOCP Activity -- five listings: 3 new, 2 updated
- New MPECs -- nine MPECs
Observers -- thirteen observing facilities
Impact Risk Monitoring -- eight 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 2 December '08

The MPC's NEO Confirmation Page has 5 listings: 3 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and two updated listings. All of these 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 2 December '08

Minor Planet Electronic Circulars

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

MPEC 2008-X17 time-stamped "07:10 UT" - Daily Orbit Update - see below
MPEC 2008-X18 time-stamped "12:56 UT" - 1999 VF22 - see below
MPEC 2008-X19 time-stamped "13:01 UT" - 2008 XF - see below
MPEC 2008-X20 time-stamped "13:05 UT" - 2008 XG - see below
MPEC 2008-X21 time-stamped "13:08 UT" - 2008 XH - see below
MPEC 2008-X22 time-stamped "13:12 UT" - 2008 XJ - see below
MPEC 2008-X23 time-stamped "13:17 UT" - 2008 XK - see below
MPEC 2008-X24 time-stamped "21:05 UT" - Comets C/2008 Q5, 2008 R8, 2008 R9, 2008 R10 (SOHO) - see below
MPEC 2008-X25 time-stamped "21:41 UT" - Comets C/2008 R11, 2008 R12, 2008 R13, 2008 S4 (SOHO)

MPEC 2008-X25 - "21:41 UT" - Comets C/2008 R11, 2008 R12, 2008 R13, 2008 S4 (SOHO)

CK08S040 C/2008 S4 from the LASCO Coronagraph 3 aboard the Solar & Heliospheric Obs. (SOHO) (Sept. 17.57-78p22, 17.85-93p10 & 17.97-01p6)
CK08R130 C/2008 R13 from SOHO C3 (Sept. 14.60-78p20 & 14.82-85p4)
CK08R120 C/2008 R12 from SOHO C3 (Sept. 11.91-93p4, 11.97-03p8 & 12.10-86p68) and the LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. (SOHO) (Sept. 12.90-94p8)
CK08R110 C/2008 R11 from SOHO C3 (Sept. 7.90-93p4, 7.97-99p4, 8.03-57p46 & 8.62-64p4)

MPEC 2008-X24 - "21:05 UT" - Comets C/2008 Q5, 2008 R8, 2008 R9, 2008 R10 (SOHO)

CK08R100 C/2008 R10 from SOHO C3 (Sept. 7.90-93p4, 7.97-53p48, 8.62-78p18, 8.82-93p12 & 8.97-03p8) and SOHO C2 (Sept. 9.04-17p18)
CK08R090 C/2008 R9 from SOHO C3 (Sept. 4.90-28p34, 5.32-53p22 & 5.57-68p10)
CK08R080 C/2008 R8 from SOHO C2 (Sept. 3.63-75p18)
CK08Q050 C/2008 Q5 from SOHO C3 (Aug. 26.76-93p18, 26.97-99p4 & 27.05-07p4)

MPEC 2008-X23 - "13:17 UT" - 2008 XK

K08X00K 2008 XK (risk-listed, Earth MOID=0.3 LD, H=27.2 ~12m) was discovered at 0643 UT on 2 Dec. by the Mt. Lemmon Survey (MLS), which observed it at Dec. 2.28-35p8. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Dec. 2.35-37p4). This object will be coming within ten lunar distances (LD) of Earth, reaching 2.0 LD on 7 Dec.

MPEC 2008-X22 - "13:12 UT" - 2008 XJ

K08X00J 2008 XJ (H=21.2 ~195m) was discovered at 1003 UT on 1 Dec. by MLS, which observed it at Dec. 1.42-44p4. The discovery was confirmed by MRO (Dec. 2.41-44p4).

MPEC 2008-X21 - "13:08 UT" - 2008 XH

K08X00H 2008 XH (small asteroid, Earth MOID=6.0 LD, H=22.7 ~98m) was discovered at 0857 UT on 1 Dec. by MLS, which observed it at Dec. 1.37-40p3. The discovery was confirmed by Great Shefford Obs. (Dec. 2.08-10p3), MRO (Dec. 2.20-21p4), and Sandlot Obs. (Dec. 2.38-39p2).

MPEC 2008-X20 - "13:05 UT" - 2008 XG

K08X00G 2008 XG (small asteroid, H=24.5 ~43m) was discovered at 0734 UT on 1 Dec. by MLS, which observed it at Dec. 1.32-40p7 and 2.36-38p4. The discovery was confirmed by Great Shefford Obs. (Dec. 2.11-14p5), MRO (Dec. 2.22-24p4), and the Spacewatch 1.8m telescope (Dec. 2.41-42p3).

MPEC 2008-X19 - "13:01 UT" - 2008 XF

K08X00F 2008 XF (small asteroid, H=23.0 ~85m) was discovered at 0606 UT on 1 Dec. by MLS, which observed it at Dec. 1.25-28p4, 1.36p2, and 2.31-33p4. The discovery was confirmed by MRO (Dec. 2.29-30p5) and Spacewatch 1.8m (Dec. 2.32-33p3 at V=21.7-22.2).

MPEC 2008-X18 - "12:56 UT" - 1999 VF22

J99V22F 1999 VF22 (q=0.343 AU, H=20.6 ~257m) from MLS (Dec. 1.17-24p8 & 2.14-16p4) and MRO (Dec. 2.25-26p4)

<< DOU on 2 Dec. '08 >> MPEC 2008-X17 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K08W96K 2008 WK96 (small asteroid, arc=2 days, H=22.6 ~102m) from Great Shefford Obs. (Dec. 2.20p3)
K08W94Y 2008 WY94 (small asteroid, arc=2 days, H=25.5 ~27m) from the Siding Spring Survey (SSS) (Dec. 1.44-49p3 & 1.56p1)
K08W13Z 2008 WZ13 (arc=11 days, H=18.7 ~616m) from Spacewatch 1.8m (Dec. 1.23p3)
K08W13Y 2008 WY13 (Q=4.204 AU, arc=11 days, H=21.6 ~162m) from Spacewatch 1.8m (Dec. 1.21-22p3)
K08U99W 2008 UW99 (small asteroid, arc=31 days, H=24.7 ~39m) from Spacewatch 1.8m (Dec. 1.36-37p3)
Observations of recently (no longer) risk-listed objects
K08W64M 2008 WM64 (arc=7 days, H=20.5 ~269m) from Spacewatch 1.8m (Dec. 1.45-46p3)
K08W63Q 2008 WQ63 (arc=9 days, H=20.0 ~339m) from Desert Moon Obs. (Dec. 1.32-36p3)
K08W61L 2008 WL61 (arc=7 days, H=19.5 ~426m) from Spacewatch 1.8m (Dec. 1.17p3)
K08W14D 2008 WD14 (small asteroid, arc=10 days, H=22.7 ~98m) from SSS (Dec. 1.53p2)
K08V14L 2008 VL14 (Q=4.016 AU, arc=22 days, H=21.1 ~204m) from Spacewatch 1.8m (Dec. 1.34-35p3)
Observations of small asteroids (H>22.0)
K08W96E 2008 WE96 (arc=1 day, H=23.7 ~62m) from MLS (Nov. 30.38p4)
K08W60K 2008 WK60 (arc=8 days, H=22.5 ~107m) from SSS (Dec. 1.49p1)
Observations of other objects
K08W94Z 2008 WZ94 (q=0.323 AU, arc=1 day, H=19.9 ~355m) from LINEAR (Dec. 1.27-31p4)
K08W61K 2008 WK61 (arc=10 days, H=20.5 ~269m) from LINEAR (Dec. 1.44-49p5)
K08W60H 2008 WH60 (arc=7 days, H=20.8 ~234m) from La Sagra Obs. (Nov. 27.87-88p3)
K08W00B 2008 WB (i=44.3°, arc=14 days, H=21.2 ~195m) from Spacewatch 1.8m (Dec. 1.18-19p3)
K08V14G 2008 VG14 (Q=4.405 AU, arc=24 days, H=20.3 ~295m) from Desert Moon Obs. (Dec. 1.26-30p3)
K08V00F 2008 VF (arc=30 days, H=19.5 ~426m) from LINEAR (Dec. 1.27-32p5)
K08U90N 2008 UN90 (arc=35 days, H=19.9 ~355m) from Spacewatch 1.8m (Dec. 1.11-12p3)
K08U07E 2008 UE7 (arc=36 days, H=20.4 ~282m) from LINEAR (Dec. 1.25-30p5)
K08U00C 2008 UC (arc=43 days, H=18.9 ~562m) from SSS (Dec. 1.56p2)
K08T04D 2008 TD4 (arc=55 days, H=19.7 ~389m) from Spacewatch 1.8m (Dec. 1.26-27p3)
K08S00E 2008 SE (arc=72 days, H=19.4 ~446m) from Goodricke-Pigott Obs. (Dec. 1.20-23p3) and the Catalina Sky Survey (CSS) (Dec. 1.26-28p4)
K08E05V 2008 EV5 (arc=2 opp, H=19.9 ~355m) from SSS (Dec. 1.74p1)
K07F20E 2007 FE20 (arc=2 opp, H=19.7 ~389m) from MLS (Dec. 1.37-40p4)
K06U63C 2006 UC63 (arc=2 opp, H=19.9 ~355m) from Spacewatch 1.8m (Dec. 1.31p2)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.3 ~1.17 km) from CSS (Dec. 1.36-38p2)
K06B27B 2006 BB27 (arc=2 opp, H=19.6 ~407m) from Spacewatch 1.8m (Dec. 1.49-51p3)
K05A28Y 2005 AY28 (q=0.375 AU, arc=2 opp, H=21.7 ~155m) from Spacewatch 1.8m (Dec. 1.38-39p3 at V=22.2)
K04X60Y 2004 XY60 (q=0.130 AU, arc=4 opp, H=18.9 ~562m) from SSS (Dec. 1.64-65p2)
K04X14L 2004 XL14 (arc=3 opp, H=21.2 ~195m) from CSS (Dec. 1.48-49p3)
K02W11P 2002 WP11 (arc=3 opp, H=18.1 ~812m) from MLS (Dec. 1.10-12p4)
K01T02E 2001 TE2 (arc=4 opp, H=19.8 ~371m) from Spacewatch 1.8m (Dec. 1.54p2)
K00A06E 2000 AE6 (Q=4.220 AU, arc=3 opp, H=17.6 ~1.02 km) from LINEAR (Dec. 1.46-48p3)
J9801 199801 2007 AE12 from LINEAR (Dec. 1.26-32p5)
J4386 194386 2001 VG5 from Iluro Obs. (Nov. 30.08p3)
J2559 192559 1998 VO from CSS (Dec. 1.19-22p4)
I9973 189973 2003 XE11 from Desert Moon Obs. (Dec. 1.05-08p3)
F5110 155110 2005 TB from CSS (Dec. 1.29-31p4)
85867 85867 1999 BY9 from LINEAR (Dec. 1.40-44p4)
30825 30825 1990 TG1 from Spacewatch 1.8m (Dec. 1.53-54p3)
22099 22099 2000 EX106 from SSS (Dec. 1.62-64p4)
19356 19356 1997 GH3 from LINEAR (Dec. 1.47-51p4)
07480 7480 Norwan (1994 PC) from LINEAR (Dec. 1.46-50p3)
07358 7358 Oze (1995 YA3) from LINEAR (Dec. 1.38-43p5)
06050 6050 Miwablock (1992 AE) from Spacewatch 1.8m (Dec. 1.45-46p3)
04179 4179 Toutatis (1989 AC) from LINEAR (Dec. 1.45-50p5)

Observers on 2 December '08

Thirteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`703`	Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2008-X17 -- 2008 SE, 2006 SZ217, 2004 XL14, 192559, 155110
`448`	Desert Moon Obs. in New Mexico, 3 in MPEC 2008-X17 -- 2008 WQ63, 2008 VG14, 189973
`683`	Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2008-X17 -- 2008 SE
`J95`	Great Shefford Obs. in England, 3 in MPECs 2008-X17, 2008-X20 & 2008-X21 -- 2008 XH, 2008 XG, 2008 WK96
`B19`	Iluro Obs. in Spain, 1 in MPEC 2008-X17 -- 194386
`704`	LINEAR in New Mexico, 11 in MPEC 2008-X17 -- 2008 WZ94, 2008 WK61, 2008 VF, 2008 UE7, 2000 AE6, 85867, 199801, 19356, 7480, 7358, 4179
`J75`	La Sagra Obs. in Spain, 1 in MPEC 2008-X17 -- 2008 WH60
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2008-X18, 2008-X19, 2008-X20, 2008-X21, 2008-X22 & 2008-X23 -- 2008 XK, 2008 XJ, 2008 XH, 2008 XG, 2008 XF, 1999 VF22
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2008-X17, 2008-X18, 2008-X19, 2008-X20, 2008-X21, 2008-X22 & 2008-X23 -- 2008 XK, 2008 XJ, 2008 XH, 2008 XG, 2008 XF, 2008 WE96, 2007 FE20, 2002 WP11, 1999 VF22
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2008-X21 -- 2008 XH
`E12`	Siding Spring Survey (SSS) in New South Wales, 7 in MPEC 2008-X17 -- 2008 WY94, 2008 WK60, 2008 WD14, 2008 UC, 2008 EV5, 2004 XY60, 22099
`2492`	LASCO Coronagraph 2 (SOHO C2) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 3 in MPECs 2008-X24 & 2008-X25 -- C/2008 R8, C/2008 R12, C/2008 R10
`2493`	LASCO Coronagraph 3 (SOHO C3) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 7 in MPECs 2008-X24 & 2008-X25 -- C/2008 S4, C/2008 R9, C/2008 R13, C/2008 R12, C/2008 R11, C/2008 R10, C/2008 Q5
`291`	Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2008-X17, 2008-X19 & 2008-X20 -- 2008 XG, 2008 XF, 2008 WZ13, 2008 WY13, 2008 WM64, 2008 WL61, 2008 WB, 2008 VL14, 2008 UW99, 2008 UN90, 2008 TD4, 2006 UC63, 2006 BB27, 2005 AY28, 2001 TE2, 30825, 6050

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

Impact Risk Monitoring on 2 December '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 XK	JPL Sentry	2312	2013-2107	174	8.7e-07	-6.81	-7.71	0	JPL: "Analysis based on 12 observations spanning .08663 days (2008-Dec-02.28019 to 2008-Dec-02.36682)." Diameter approximately 0.012 km. from mean, weighted H=27.2.

2008 WK96	JPL Sentry	1332	2024-2031	2	4.4e-05	-2.74	-2.74	0	JPL: "Analysis based on 16 observations spanning 1.8148 days (2008-Nov-30.38762 to 2008-Dec-02.20247)." Diameter approximately 0.099 km. from mean, weighted H=22.7.
2008 WK96	NEODyS	1332	2024-2031	3	4.03e-05	-2.78	-2.78	0	NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2008/11/30.388 to 2008/12/02.203."

2008 WJ96	NEODyS	1332	2035	1	5.18e-10	-9.20	-9.20	0	NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2008/11/30.311 to 2008/12/01.300."

2008 WH96	NEODyS	1332	2018-2090	34	9.84e-09	-6.70	-7.25	0	NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2008/11/30.276 to 2008/12/01.287."

2008 WY94	JPL Sentry	1332	2045-2076	53	1.8e-04	-4.26	-4.51	0	JPL: "Analysis based on 17 observations spanning 2.0238 days (2008-Nov-29.54021 to 2008-Dec-01.56401)." Diameter approximately 0.027 km. from mean, weighted H=25.5.
2008 WY94	NEODyS	1332	2046-2088	71	1.96e-04	-4.24	-4.55	0	NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/11/29.541 to 2008/12/01.565."

2008 WZ13	JPL Sentry	1332	2023-2106	30	1.3e-06	-2.77	-3.05	0	JPL: "Analysis based on 47 observations spanning 10.959 days (2008-Nov-20.27557 to 2008-Dec-01.2343)." Diameter approximately 0.600 km. from mean, weighted H=18.8.
2008 WZ13	NEODyS	1332	2023-2090	17	1.19e-06	-2.78	-3.07	0	NEODyS: "Based on 47 optical observations (of which 0 are rejected as outliers) from 2008/11/20.276 to 2008/12/01.235."

2008 WY13	JPL Sentry	1332	R E M O V E D						JPL: Risk listing removed at 0951 UTC.

2008 UW99	JPL Sentry	1332	2093	2	5.5e-07	-6.46	-6.73	0	JPL: "Analysis based on 50 observations spanning 30.911 days (2008-Oct-31.45784 to 2008-Dec-01.36885)." Diameter approximately 0.039 km. from mean, weighted H=24.7.

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 2 December '08

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

2312

Noted that JPL Sentry has posted 2008 XK as an impact risk - see above
Grabbed MPEC 2008-X24 - Comets C/2008 Q5, 2008 R8, 2008 R9, 2008 R10 (SOHO) - see above
Grabbed MPEC 2008-X25 - Comets C/2008 R11, 2008 R12, 2008 R13, 2008 S4 (SOHO) - see above

1332

Noted that JPL Sentry has updated its 2008 UW99 risk assessment - see above
Noted that NEODyS has posted 2008 WH96 as an impact risk - see above
Noted that NEODyS has posted 2008 WJ96 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 WK96 risk assessment - see above
Noted that NEODyS has posted 2008 WK96 as an impact risk - see above
Noted that JPL Sentry has removed 2008 WY13 as an impact risk - see above
Noted that JPL Sentry has updated its 2008 WY94 risk assessment - see above
Noted that NEODyS has updated its 2008 WY94 risk assessment - see above
Noted that JPL Sentry has updated its 2008 WZ13 risk assessment - see above
Noted that NEODyS has updated its 2008 WZ13 risk assessment - see above
Grabbed MPEC 2008-X17 - Daily Orbit Update - see above
Grabbed MPEC 2008-X18 - 1999 VF22 - see above
Grabbed MPEC 2008-X19 - 2008 XF - see above
Grabbed MPEC 2008-X20 - 2008 XG - see above
Grabbed MPEC 2008-X21 - 2008 XH - see above
Grabbed MPEC 2008-X22 - 2008 XJ - see above
Grabbed MPEC 2008-X23 - 2008 XK - see above

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