2008-02-03 Tracking News

Contents on 3 February '08

Radar Astrometry -- one object
IAU Minor Planet Center
- NEOCP Activity -- twelve listings: 1 new, 11 updated
- New MPECs -- two MPECs
- Observers -- 26 observing facilities
Impact Risk Monitoring -- five 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.

Radar Astrometry on 3 February '08

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added the following small-body radar observing work:

Data addition noted at 0538 UTC when the database was dated 2 Feb.

2007 TU24 from Arecibo (transmit) with Green Bank (receive) at Jan. 28.85 (velocity), 28.88 (velocity), 28.88 (range), 28.90 (velocity) & 28.90 (range) and Arecibo at Feb. 2.29 (velocity) & 2.29 (range) - see links

NEOCP Activity on 3 February '08

The MPC's NEO Confirmation Page has 12 listings: 1 new, 11 updated

When last checked at 2353 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and eleven updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of fifteen 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 3 February '08

Minor Planet Electronic Circulars

As of last check at 2353 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-C16 time-stamped "03:59 UT" - Comet C/2008 C1 (Chen-Gao) - see below
MPEC 2008-C17 time-stamped "07:08 UT" - Daily Orbit Update

<< DOU on 3 Feb. '08 >> MPEC 2008-C17 - "07:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08B18T 2008 BT18 (arc=2 days, H=18.3 ~741m) from Eschenberg Obs. (Feb. 2.83-84p3)
K08B16O 2008 BO16 (small asteroid, Q=4.634 AU, arc=3 days, H=22.8 ~93m) from the Spacewatch 1.8m telescope (Feb. 2.28-29p3)
K08B15D 2008 BD15 (arc=3 days, H=20.9 ~224m) from Eschenberg Obs. (Feb. 2.76-77p14)
K08A04F 2008 AF4 (arc=23 days, H=19.8 ~371m) from LINEAR (Feb. 2.27-32p5)
Observations of recently (no longer) risk-listed objects
K08A33N 2008 AN33 (Q=4.333 AU, arc=18 days, H=18.9 ~562m) from McDonald Obs. (Feb. 2.47-49p3)
Observations of small asteroids (H>22.0)
K08C00Q 2008 CQ (arc=1 day, H=25.4 ~28m) from Gaisberg Obs. (Feb. 2.97-98p3)
K08C00P 2008 CP (arc=1 day, H=23.6 ~65m) from Guidestar Obs. (Feb. 2.94-96p4)
K08C00O 2008 CO (arc=1 day, H=22.7 ~98m) from Naef Obs. (Feb. 2.85-89p3) and Guidestar Obs. (Feb. 2.90-93p4)
Observations of almost-small asteroids (21.7<H<=22.0)
K08C00G 2008 CG (arc=1 day, H=22.0 ~135m) from LINEAR (Feb. 2.33-39p9)
K08B16P 2008 BP16 (q=0.289 AU, arc=3 days, H=21.8 ~148m) from the Mt. Lemmon Survey (MLS) (Feb. 2.37-39p4)
Observations of other objects
K08C00H 2008 CH (Q=4.146 AU, arc=1 day, H=20.4 ~282m) from LINEAR (Feb. 2.46-51p5)
K08B16Q 2008 BQ16 (arc=3 days, H=19.4 ~446m) from MLS (Feb. 2.46-48p4)
K08B02U 2008 BU2 (i=38.6°, q=0.360 AU, arc=14 days, H=18.4 ~708m) from McDonald Obs. (Feb. 2.30-31p3)
K08A33M 2008 AM33 (arc=18 days, H=21.4 ~178m) from McDonald Obs. (Feb. 2.45-46p3)
K07Y01F 2007 YF1 (Q=4.001 AU, arc=48 days, H=18.7 ~616m) from Desert Moon Obs. (Feb. 2.22-28p3)
K07X20J 2007 XJ20 (arc=2 opp, H=18.4 ~708m) from Desert Moon Obs. (Feb. 2.11-17p3)
K07U06S 2007 US6 (arc=3 opp, H=18.3 ~741m) from the Catalina Sky Survey (CSS) (Feb. 2.21-23p4)
K07T24U 2007 TU24 (arc=114 days, H=20.6 ~257m) from Siegen Obs. (Jan. 29.96p3) and Chelmsford Obs. (Feb. 2.06-11p4)
K07S06P 2007 SP6 (arc=2 opp, H=18.2 ~776m) from McDonald Obs. (Feb. 2.21-23p3)
K07E88H 2007 EH88 (arc=3 opp, H=19.8 ~371m) from McDonald Obs. (Feb. 2.27-28p3)
K05T45U 2005 TU45 (arc=3 opp, H=17.0 ~1.35 km) from Brainerd Obs. (Feb. 1.07-08p6)
K04D00C 2004 DC (arc=2 opp, H=18.2 ~776m) from McDonald Obs. (Feb. 2.19-20p3)
K04BC1G 2004 BG121 (arc=3 opp, H=18.9 ~562m) from MLS (Feb. 2.21-23p4)
K04A01R 2004 AR1 (arc=3 opp, H=19.8 ~371m) from Eschenberg Obs. (Feb. 2.81p3)
J98B10B 1998 BB10 (arc=5 opp, H=20.4 ~282m) from Eschenberg Obs. (Feb. 2.79p3)
J93T02Q 1993 TQ2 (arc=2 opp, H=19.9 ~355m) from McDonald Obs. (Feb. 2.25-26p3)
H3561 173561 2000 YV137 from LINEAR (Feb. 2.28-33p5)
H0891 170891 2004 TY16 from LINEAR (Feb. 2.21-26p5)
G2433 162433 2000 FK10 from McDonald Obs. (Feb. 2.50-51p3)
G2173 162173 1999 JU3 from Desert Moon Obs. (Feb. 2.07-08p3) and Naef Obs. (Feb. 2.79-81p2)
G2038 162038 1996 DH from LINEAR (Feb. 2.33-39p5)
F4347 154347 2002 XK4 from Thompsonville Obs. (Feb. 3.17-18p6)
E3678 143678 2003 SA224 from LINEAR (Feb. 2.09-14p4)
D8205 138205 2000 EZ148 from MLS (Feb. 2.37-39p4)
D8175 138175 2000 EE104 from CSS (Feb. 2.31-33p4)
D8013 138013 2000 CN101 from Thompsonville Obs. (Feb. 3.15-17p6)
99935 99935 2002 AV4 from Thompsonville Obs. (Feb. 3.06p6)
96189 96189 1991 NT3 from Thompsonville Obs. (Feb. 3.15p6)
90403 90403 2003 YE45 from Thompsonville Obs. (Feb. 3.09-10p6)
86324 86324 1999 WA2 from Thompsonville Obs. (Feb. 3.07p6)
22099 22099 2000 EX106 from Spacewatch 1.8m (Feb. 2.28-29p3)
07889 7889 1994 LX from Jarnac Obs. (Feb. 2.50-53p3)
05131 5131 1990 BG from LINEAR (Feb. 2.21-26p5)
04954 4954 Eric (1990 SQ) from Siegen Obs. (Jan. 29.99p3)
04450 4450 Pan (1987 SY) from Montana Blanca Obs. (Feb. 2.94-95p3)
03553 3553 Mera (1985 JA) from Naef Obs. (Feb. 2.79-82p2)

MPEC 2008-C16 - "03:59 UT" - Comet C/2008 C1 (Chen-Gao)

CK08C010 C/2008 C1 (i=61.9°, q=1.269 AU, TP=2008 Apr. 17.216 TT) from La Canada Obs. (Feb. 2.79-80p5), Szamotuly-Galowo Obs. (Feb. 2.86-87p2 & 3.03-04p5), Schiaparelli Obs. (Feb. 2.88-89p3), Engelhardt Obs. Zelenchukskaya Station (Feb. 2.89p1), Alter Satzberg Obs. (Feb. 2.95p4), Irmtraut Obs. (Feb. 2.96-98p4), Petit Jean Mtn. South Obs. (PJMSO) (Feb. 3.04-06p10), and RAS Obs. Mayhill (Feb. 3.10-11p2)

Observers on 3 February '08

A total of 26 observing facilities appear in today's MPECs.

Code	Observer / observatory
`B03`	Alter Satzberg Obs. in Austria, 1 in MPEC 2008-C16 -- C/2008 C1
`251`	Arecibo in Puerto Rico, 2 in radar -- 2007 TU24, 2007 TU24
`726`	Brainerd Obs. in Minnesota, 1 in MPEC 2008-C17 -- 2005 TU45
`703`	Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-C17 -- 2007 US6, 138175
`970`	Chelmsford Obs. in England, 1 in MPEC 2008-C17 -- 2007 TU24
`448`	Desert Moon Obs. in New Mexico, 3 in MPEC 2008-C17 -- 2007 YF1, 2007 XJ20, 162173
`114`	Engelhardt Obs. Zelenchukskaya Station in Karachay-Cherkessia, 1 in MPEC 2008-C16 -- C/2008 C1
`151`	Eschenberg Obs. in Switzerland, 4 in MPEC 2008-C17 -- 2008 BT18, 2008 BD15, 2004 AR1, 1998 BB10
`B21`	Gaisberg Obs. in Austria, 1 in MPEC 2008-C17 -- 2008 CQ
`256`	Green Bank in West Virginia, 1 in radar -- 2007 TU24
`A17`	Guidestar Obs. in Germany, 2 in MPEC 2008-C17 -- 2008 CP, 2008 CO
`A21`	Irmtraut Obs. in Germany, 1 in MPEC 2008-C16 -- C/2008 C1
`G92`	Jarnac Obs. in Arizona, 1 in MPEC 2008-C17 -- 7889
`704`	LINEAR in New Mexico, 8 in MPEC 2008-C17 -- 2008 CH, 2008 CG, 2008 AF4, 173561, 170891, 162038, 143678, 5131
`J87`	La Canada Obs. in Spain, 1 in MPEC 2008-C16 -- C/2008 C1
`711`	McDonald Obs. in Texas, 8 in MPEC 2008-C17 -- 2008 BU2, 2008 AN33, 2008 AM33, 2007 SP6, 2007 EH88, 2004 DC, 1993 TQ2, 162433
`J46`	Montana Blanca Obs. in the Canary Islands, 1 in MPEC 2008-C17 -- 4450
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2008-C17 -- 2008 BQ16, 2008 BP16, 2004 BG121, 138205
`A13`	Naef Obs. in Switzerland, 3 in MPEC 2008-C17 -- 2008 CO, 162173, 3553
`H45`	Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2008-C16 -- C/2008 C1
`H06`	RAS Obs. Mayhill in New Mexico, 1 in MPEC 2008-C16 -- C/2008 C1
`204`	Schiaparelli Obs. in Italy, 1 in MPEC 2008-C16 -- C/2008 C1
`510`	Siegen Obs. in Germany, 2 in MPEC 2008-C17 -- 2007 TU24, 4954
`291`	Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2008-C17 -- 2008 BO16, 22099
`B30`	Szamotuly-Galowo Obs. in Poland, 1 in MPEC 2008-C16 -- C/2008 C1
`H53`	Thompsonville Obs. in Illinois, 6 in MPEC 2008-C17 -- 99935, 96189, 90403, 86324, 154347, 138013

Impact Risk Monitoring on 3 February '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2353 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of 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 CJ	NEODyS	1550	2028-2083	7	4.44e-08	-8.29	-8.63	0	NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/02/02.247 to 2008/02/02.430."

2008 BT18	JPL Sentry	1550	2011-2106	96	1.9e-07	-3.33	-3.82	0	JPL: "Analysis based on 17 observations spanning 2.4286 days (2008-Jan-31.41308 to 2008-Feb-02.84171)." Diameter approximately 0.731 km. from mean, weighted H=18.3.
2008 BT18	NEODyS	1550	2011-2088	62	1.02e-07	-3.51	-4.05	0	NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/01/31.414 to 2008/02/02.842."

2008 BO16	JPL Sentry	1550	2041-2079	4	1.4e-06	-4.38	-4.44	0	JPL: "Analysis based on 20 observations spanning 2.9057 days (2008-Jan-30.38083 to 2008-Feb-02.28652)." Diameter approximately 0.085 km. from mean, weighted H=23.0.
2008 BO16	NEODyS	1550	2045-2079	5	1.37e-06	-4.38	-4.45	0	NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2008/01/30.382 to 2008/02/02.287."

2008 BD15	JPL Sentry	1550	2042	1	2.6e-08	-5.27	-5.27	0	JPL: "Analysis based on 61 observations spanning 3.4527 days (2008-Jan-30.31301 to 2008-Feb-02.7657)." Diameter approximately 0.230 km. from mean, weighted H=20.9.

2008 AF4	JPL Sentry	1550	2078-2105	31	2.6e-05	-2.32	-2.85	0	JPL: "Analysis based on 349 observations spanning 22.924 days (2008-Jan-10.39652 to 2008-Feb-02.32076)." Diameter approximately 0.380 km. from mean, weighted H=19.8.
2008 AF4	NEODyS	1550	2067-2090	23	6.04e-06	-2.91	-3.12	0	NEODyS: "Based on 353 optical observations (of which 4 are rejected as outliers) from 2008/01/10.397 to 2008/02/02.322."

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 3 February '08

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

1550	Noted that JPL Sentry has updated its 2008 AF4 risk assessment - see above Noted that NEODyS has updated its 2008 AF4 risk assessment - see above Noted that JPL Sentry has updated its 2008 BD15 risk assessment - see above Noted that JPL Sentry has updated its 2008 BO16 risk assessment - see above Noted that NEODyS has updated its 2008 BO16 risk assessment - see above Noted that JPL Sentry has updated its 2008 BT18 risk assessment - see above Noted that NEODyS has updated its 2008 BT18 risk assessment - see above Noted that NEODyS has posted 2008 CJ as an impact risk - see above Grabbed MPEC 2008-C17 - Daily Orbit Update - see above
0538	Noted Radar Astrometry database addition - see above
0537	Grabbed MPEC 2008-C16 - Comet C/2008 C1 (Chen-Gao) - see above

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