2008-12-04 Tracking News

Contents on 4 December '08

IAU Minor Planet Center
- NEOCP Activity -- twelve listings: 7 new, 5 updated
- New MPECs -- four MPECs
Observers -- fifteen observing facilities
Impact Risk Monitoring -- six 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 4 December '08

The MPC's NEO Confirmation Page has 12 listings: 7 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven new and five updated listings. All of these were "one nighters." So far The Tracking News has counted a total of seventeen 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 '08

Minor Planet Electronic Circulars

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

MPEC 2008-X35 time-stamped "07:10 UT" - Daily Orbit Update - see below
MPEC 2008-X36 time-stamped "14:09 UT" - 2008 XK1 - see below
MPEC 2008-X37 time-stamped "14:11 UT" - 2008 XL1 - see below
MPEC 2008-X38 time-stamped "14:26 UT" - 2008 XM1

MPEC 2008-X38 - "14:26 UT" - 2008 XM1

K08X01M 2008 XM1 (risk-listed, Earth MOID=2.2 LD, H=21.9 ~141m) was discovered at 0547 UT on 4 Dec. by the Catalina Sky Survey (CSS), which observed it at Dec. 4.24-30p6. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (Dec. 4.32-33p4) and Sabino Canyon Obs. (Dec. 4.41p3).

MPEC 2008-X37 - "14:11 UT" - 2008 XL1

K08X01L 2008 XL1 (small asteroid, H=22.9 ~89m) was discovered at 0744 UT on 3 Dec. by the Mt. Lemmon Survey (MLS), which observed it at Dec. 3.32-39p7. The discovery was confirmed by MRO (Dec. 4.27-28p4) and the Spacewatch 1.8m telescope (Dec. 4.32-33p3).

MPEC 2008-X36 - "14:09 UT" - 2008 XK1

K08X01K 2008 XK1 (small asteroid, H=23.4 ~71m) was discovered at 0742 UT on 3 Dec. by MLS, which observed it at Dec. 3.32-39p7. The discovery was confirmed by Remanzacco Obs. (Dec. 3.99p1) and MRO (Dec. 4.29-30p4).

<< DOU on 4 Dec. '08 >> MPEC 2008-X35 - "07:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K08X01C 2008 XC1 (small asteroid, arc=1 day, H=23.2 ~78m) from MRO (Dec. 4.25-26p4)
K08W94Y 2008 WY94 (small asteroid, arc=4 days, H=25.5 ~27m) from the Siding Spring Survey (SSS) (Dec. 3.42-47p4)
Observations of recently (no longer) risk-listed objects
K08W59B 2008 WB59 (arc=11 days, H=19.4 ~446m) from Tradate Obs. (Dec. 3.92p1)
K08W14D 2008 WD14 (small asteroid, arc=12 days, H=22.7 ~98m) from SSS (Dec. 3.47p2)
K04X03K 2004 XK3 (small asteroid, arc=2 opp, H=24.4 ~45m) from LINEAR (Dec. 3.25-30p5)
Observations of small asteroids (H>22.0)
K08W96F 2008 WF96 (arc=3 days, H=23.8 ~59m) from MLS (Dec. 3.27-29p3)
K08W14G 2008 WG14 (arc=12 days, H=24.8 ~37m) from CSS (Dec. 3.20-22p5)
Observations of other objects
K08X01B 2008 XB1 (arc=1 day, H=20.7 ~245m) from New Millennium Obs. (Dec. 3.88-89p7) and Sandlot Obs. (Dec. 4.00-01p2)
K08W60L 2008 WL60 (arc=10 days, H=18.1 ~812m) from CSS (Dec. 3.30-31p3) and Tradate Obs. (Dec. 3.85p1 & 3.93p1)
K08W14C 2008 WC14 (Q=5.036 AU, arc=13 days, H=20.1 ~323m) from CSS (Dec. 3.49-50p4)
K08V14K 2008 VK14 (arc=25 days, H=19.2 ~490m) from Hamamatsu-Yuto Obs. (Dec. 3.71-73p4)
K08V04U 2008 VU4 (Q=4.212 AU, arc=26 days, H=17.5 ~1.07 km) from CSS (Dec. 3.24-25p3) and Hamamatsu-Yuto Obs. (Dec. 3.62-65p7)
K08U95C 2008 UC95 (arc=35 days, H=18.4 ~708m) from LINEAR (Dec. 3.44-49p5)
K08U07E 2008 UE7 (arc=39 days, H=20.4 ~282m) from Hamamatsu-Yuto Obs. (Dec. 3.74-76p7) and Tradate Obs. (Dec. 3.90p1)
K08S01Q 2008 SQ1 (Q=4.682 AU, arc=2 opp, H=18.4 ~708m) from Hamamatsu-Yuto Obs. (Dec. 3.52-55p9)
K08M00Z 2008 MZ (Q=4.207 AU, arc=171 days, H=18.6 ~645m) from Hamamatsu-Yuto Obs. (Dec. 3.67-70p5)
K08L16W 2008 LW16 (arc=171 days, H=19.8 ~371m) from SSS (Dec. 3.50p2)
K08H03E 2008 HE3 (Q=4.481 AU, arc=2 opp, H=19.0 ~537m) from SSS (Dec. 3.61-65p3)
K08G20V 2008 GV20 (arc=236 days, H=18.7 ~616m) from SSS (Dec. 3.61-65p3)
K07B02T 2007 BT2 (arc=3 opp, H=17.2 ~1.23 km) from CSS (Dec. 3.51-52p3)
K06W02Y 2006 WY2 (arc=3 opp, H=18.5 ~676m) from SSS (Dec. 3.61-65p4)
K06V14B 2006 VB14 (arc=2 opp, H=18.6 ~645m) from MLS (Dec. 3.40-42p4) and Hamamatsu-Yuto Obs. (Dec. 3.78-80p8)
K06SL7Z 2006 SZ217 (arc=3 opp, H=17.3 ~1.17 km) from AAAA Buenos Aires Obs. (Nov. 22.23-25p3) and Hamamatsu-Yuto Obs. (Dec. 3.60-61p7)
K05T51Z 2005 TZ51 (arc=3 opp, H=17.9 ~891m) from Hamamatsu-Yuto Obs. (Dec. 3.49-50p5)
K04X60Y 2004 XY60 (q=0.130 AU, arc=4 opp, H=18.9 ~562m) from SSS (Dec. 3.48-49p2)
K03Y01X 2003 YX1 (arc=2 opp, H=20.9 ~224m) from the Spacewatch 0.9m telescope (Dec. 3.53-55p3)
K03Y01O 2003 YO1 (arc=4 opp, H=19.6 ~407m) from Spacewatch 0.9m (Dec. 3.30-33p3)
K03H06B 2003 HB6 (Q=4.255 AU, arc=3 opp, H=17.6 ~1.02 km) from MLS (Dec. 3.32-34p4)
K02E02Z 2002 EZ2 (arc=3 opp, H=20.1 ~323m) from Spacewatch 1.8m (Dec. 3.49p3)
K01W25A 2001 WA25 (arc=4 opp, H=18.6 ~645m) from Hamamatsu-Yuto Obs. (Dec. 3.81-84p7)
K01L05M 2001 LM5 (arc=3 opp, H=19.3 ~467m) from San Benedetto Po Obs. (Dec. 3.86-87p6)
J98S70J 1998 SJ70 (arc=3 opp, H=18.4 ~708m) from MLS (Dec. 3.16-18p4)
J94X00G 1994 XG (arc=4 opp, H=18.7 ~616m) from Spacewatch 0.9m (Dec. 3.24-28p3)
J0166 190166 2005 UP156 from Spacewatch 0.9m (Dec. 3.08-11p3)
G2900 162900 2001 HG31 from San Benedetto Po Obs. (Dec. 3.84-85p6)
G2004 162004 1991 VE from LINEAR (Dec. 3.31-36p5)
G1989 161989 Cacus (1978 CA) from SSS (Dec. 3.66-69p3)
D7052 137052 1998 VO33 from Spacewatch 0.9m (Dec. 3.34-38p2)
D7044 137044 1998 UC50 from MLS (Dec. 3.21-23p4)
D6923 136923 1998 JH2 from LINEAR (Dec. 3.27-31p4), Spacewatch 0.9m (Dec. 3.35-39p3), and CSS (Dec. 3.42-44p5)
85236 85236 1993 KH from San Benedetto Po Obs. (Dec. 3.81p5)
54690 54690 2001 EB from MLS (Dec. 3.10-12p4)
36236 36236 1999 VV from CSS (Dec. 3.15-16p4)
20460 20460 Robwhiteley (1999 LO28) from CSS (Dec. 3.29-31p5)
12711 12711 Tukmit (1991 BB) from CSS (Dec. 3.45-46p5)
07480 7480 Norwan (1994 PC) from Spacewatch 0.9m (Dec. 3.53-55p3)
06239 6239 Minos (1989 QF) from LINEAR (Dec. 3.40-44p4)
04596 4596 1981 QB from SSS (Dec. 3.69-71p3)
03122 3122 Florence (1981 ET3) from LINEAR (Dec. 3.45-50p5)
01627 1627 Ivar (1929 SH) from LINEAR (Dec. 3.07-11p5)
01036 1036 Ganymed (1924 TD) from SSS (Dec. 3.67-71p4)

Observers on 4 December '08

Fifteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`834`	AAAA Buenos Aires Obs. in Argentina, 1 in MPEC 2008-X35 -- 2006 SZ217
`703`	Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2008-X35 & 2008-X38 -- 2008 XM1, 2008 WL60, 2008 WG14, 2008 WC14, 2008 VU4, 2007 BT2, 36236, 20460, 136923, 12711
`379`	Hamamatsu-Yuto Obs. in Japan, 9 in MPEC 2008-X35 -- 2008 VU4, 2008 VK14, 2008 UE7, 2008 SQ1, 2008 MZ, 2006 VB14, 2006 SZ217, 2005 TZ51, 2001 WA25
`704`	LINEAR in New Mexico, 7 in MPEC 2008-X35 -- 2008 UC95, 2004 XK3, 162004, 136923, 6239, 3122, 1627
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2008-X35, 2008-X36, 2008-X37 & 2008-X38 -- 2008 XM1, 2008 XL1, 2008 XK1, 2008 XC1
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-X35, 2008-X36 & 2008-X37 -- 2008 XL1, 2008 XK1, 2008 WF96, 2006 VB14, 2003 HB6, 1998 SJ70, 54690, 137044
`A24`	New Millennium Obs. in Italy, 1 in MPEC 2008-X35 -- 2008 XB1
`473`	Remanzacco Obs. in Italy, 1 in MPEC 2008-X36 -- 2008 XK1
`854`	Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-X38 -- 2008 XM1
`434`	San Benedetto Po Obs. in Italy, 3 in MPEC 2008-X35 -- 2001 LM5, 85236, 162900
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2008-X35 -- 2008 XB1
`E12`	Siding Spring Survey (SSS) in New South Wales, 10 in MPEC 2008-X35 -- 2008 WY94, 2008 WD14, 2008 LW16, 2008 HE3, 2008 GV20, 2006 WY2, 2004 XY60, 161989, 4596, 1036
`691`	Spacewatch 0.9m telescope in Arizona, 7 in MPEC 2008-X35 -- 2003 YX1, 2003 YO1, 1994 XG, 190166, 137052, 136923, 7480
`291`	Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2008-X35 & 2008-X37 -- 2008 XL1, 2002 EZ2
`B39`	Tradate Obs. in Italy, 3 in MPEC 2008-X35 -- 2008 WL60, 2008 WB59, 2008 UE7

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

Impact Risk Monitoring on 4 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 XM1	JPL Sentry	2229	2010-2108	96	1.4e-07	-4.11	-4.32	0	JPL: "Analysis based on 13 observations spanning .17221 days (2008-Dec-04.24125 to 2008-Dec-04.41346)." Diameter approximately 0.192 km. from mean, weighted H=21.2.

2008 XC1	JPL Sentry	1355	2046-2106	50	7.3e-06	-4.39	-5.04	0	JPL #2 for the day: "Analysis based on 17 observations spanning .89273 days (2008-Dec-03.36799 to 2008-Dec-04.26072)." Diameter approximately 0.077 km. from mean, weighted H=23.2.
2008 XC1	NEODyS	1355	2046-2088	20	3.23e-06	-4.70	-5.33	0	NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/12/03.369 to 2008/12/04.261."

2008 XO	NEODyS	1355	2024-2075	4	2.5e-09	-7.64	-7.80	0	NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/12/02.420 to 2008/12/03.391."

2008 XN	NEODyS	1355	2010-2041	5	2.37e-08	-3.87	-3.87	0	NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2008/12/02.361 to 2008/12/03.313."

2008 XB	NEODyS	1828	2021-2064	2	1.82e-08	-6.54	-6.54	0	NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2008/12/01.135 to 2008/12/01.210."

2008 WY94	JPL Sentry	1355	2045-2074	8	7.5e-06	-5.68	-5.80	0	JPL: "Analysis based on 25 observations spanning 3.9252 days (2008-Nov-29.54021 to 2008-Dec-03.46541)." Diameter approximately 0.026 km. from mean, weighted H=25.5.
2008 WY94	NEODyS	1355	2068-2085	11	1.04e-05	-5.53	-5.63	0	NEODyS: "Based on 26 optical observations (of which 1 are rejected as outliers) from 2008/11/29.541 to 2008/12/03.466."

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 '08

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

2229	Noted that JPL Sentry has posted 2008 XM1 as an impact risk - see above
1828	Noted that NEODyS has posted 2008 XB as an impact risk - see above
1500	Grabbed MPEC 2008-X36 - 2008 XK1 - see above Grabbed MPEC 2008-X37 - 2008 XL1 - see above Grabbed MPEC 2008-X38 - 2008 XM1 - see above
1355	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 XC1 risk assessment - see above Noted that NEODyS has posted 2008 XC1 as an impact risk - see above Noted that NEODyS has posted 2008 XN as an impact risk - see above Noted that NEODyS has posted 2008 XO as an impact risk - see above Grabbed MPEC 2008-X35 - Daily Orbit Update - see above
0201	Noted that JPL Sentry has posted 2008 XC1 as an impact risk - see above

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