2008-04-02 Tracking News

Contents on 2 April '08

IAU Minor Planet Center
- NEOCP Activity -- two listings: 2 updated
- New MPECs -- six MPECs
Observers -- seventeen observing facilities
Impact Risk Monitoring -- ten 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 April '08

The MPC's NEO Confirmation Page has 2 listings: 2 updated

When last checked at 2353 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two updated listings. Of these, one was a "one nighter." So far The Tracking News has counted a total of five 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 April '08

Minor Planet Electronic Circulars

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

MPEC 2008-G10 time-stamped "03:33 UT" - Comet P/1998 X1 = 2006 B7 (ODAS) - see below
MPEC 2008-G11 time-stamped "06:08 UT" - Daily Orbit Update - see below
MPEC 2008-G12 time-stamped "15:44 UT" - 2008 GG - see below
MPEC 2008-G13 time-stamped "15:49 UT" - 2008 GH - see below
MPEC 2008-G14 time-stamped "16:15 UT" - 2008 GJ - see below
MPEC 2008-G15 time-stamped "21:35 UT" - Comets C/2007 F2, 2007 S5 (SOHO)

MPEC 2008-G15 - "21:35 UT" - Comets C/2007 F2, 2007 S5 (SOHO)

CK07S050 C/2007 S5 from the HI1-B instrument (4) aboard STEREO-B (2007 Sept. 25.10-18p8, 2007 Sept. 25.24-27p4, 2007 Sept. 25.38-52p12, 2007 Sept. 25.57p2, 2007 Sept. 25.63-66p4, 2007 Sept. 25.85-91p6, 2007 Sept. 26.02p2, 2007 Sept. 26.07p2, 2007 Sept. 26.13-16p4, 2007 Sept. 26.24-27p4, 2007 Sept. 26.32-41p8, 2007 Sept. 26.46-52p6, 2007 Sept. 26.57-60p4, 2007 Sept. 26.66p2, 2007 Sept. 26.71-77p6, 2007 Sept. 26.82-91p8, 2007 Sept. 26.96p2 & 2007 Sept. 27.10-27p14), the COR2-A instrument (5) aboard STEREO-A (2007 Sept. 27.44-88p44), and the COR2-B instrument (5) aboard STEREO-B (2007 Sept. 27.61-84p24)
CK07F020 C/2007 F2 from the HI1-A instrument (4) aboard STEREO-A (2007 March 19.73-79p6, 2007 March 19.84p2, 2007 March 19.93-95p4, 2007 March 20.01-26p20, 2007 March 20.32-40p8, 2007 March 20.45-51p6, 2007 March 20.57p2 & 2007 March 20.62-51p66), STEREO-B/COR2-B (5) (2007 March 21.70-13p42), and STEREO-A/COR2-A (5) (2007 March 21.74-22p48)

MPEC 2008-G14 - "16:15 UT" - 2008 GJ

K08G00J 2008 GJ (risk-listed, H=20.3 ~295m) was discovered at 0708 UT on 1 April by the Mt. Lemmon Survey (MLS), which observed it at April 1.30-36p7. The discovery was confirmed by Astronomical Research Obs. (ARO) (April 2.23-26p3).

MPEC 2008-G13 - "15:49 UT" - 2008 GH

K08G00H 2008 GH (small asteroid, Q=4.646 AU, Earth MOID=9.0 LD, H=23.8 ~59m) was discovered at 0708 UT on 1 April by MLS, which observed it at April 1.30-36p7. The discovery was confirmed by ARO (April 2.21-22p3).

MPEC 2008-G12 - "15:44 UT" - 2008 GG

K08G00G 2008 GG (risk-listed, q=0.321 AU, H=20.7 ~245m) was discovered at 0630 UT on 1 April by MLS, which observed it at April 1.27-29p4 at V=21.5-22.1 and 1.37-39p4 at V=21.0-21.6. The discovery was confirmed by Dave Balam via Plaskett 1.8m Telescope (April 1.39-40p3), Great Shefford Obs. (April 1.95-98p3), and ARO (April 2.18-20p3 at V=22.0-22.2).

<< DOU on 2 Apr. '08 >> MPEC 2008-G11 - "06:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08F06W 2008 FW6 (arc=3 days, H=20.9 ~224m) from the Spacewatch 1.8m telescope (April 1.39-40p3) and Great Shefford Obs. (April 1.89-90p3)
K08F06T 2008 FT6 (arc=3 days, H=17.4 ~1.12 km) from Spacewatch 1.8m (April 1.41-42p3)
K08F05F 2008 FF5 (small asteroid, q=0.081 AU, Q=4.372 AU, arc=4 days, H=23.1 ~81m) from Spacewatch 1.8m (April 1.33p2)
K08F00N 2008 FN (i=45.7°, arc=5 days, H=18.4 ~708m) from Spacewatch 1.8m (April 1.46p3) and MLS (April 1.51p4)
K08E09A 2008 EA9 (small asteroid, arc=26 days, H=27.7 ~10m) from Spacewatch 1.8m (April 1.34p2)
K08E07R 2008 ER7 (arc=26 days, H=20.0 ~339m) from Spacewatch 1.8m (April 1.31-32p3)
Observations of recently (no longer) risk-listed objects
K08F05W 2008 FW5 (almost small, arc=4 days, H=21.9 ~141m) from Spacewatch 1.8m (April 1.44-45p3)
K08E00S 2008 ES (Q=4.037 AU, arc=2 opp, H=18.2 ~776m) from the Catalina Sky Survey (CSS) (April 1.33-35p4)
Observations of small asteroids (H>22.0)
K08F06X 2008 FX6 (arc=3 days, H=25.0 ~34m) from Great Shefford Obs. (April 1.83p2)
K08F06S 2008 FS6 (arc=3 days, H=22.4 ~112m) from the Spacewatch 0.9m telescope (April 1.31-34p3) and Spacewatch 1.8m (April 1.41p2)
K08F05E 2008 FE5 (arc=4 days, H=22.1 ~129m) from Jim Young via Table Mtn. Obs. (April 1.26-28p4)
K08F00O 2008 FO (arc=6 days, H=23.3 ~74m) from Greiner Research Obs. (GRO) (April 2.11-12p4)
K08F00H 2008 FH (arc=5 days, H=24.3 ~47m) from Spacewatch 1.8m (April 1.27-28p3)
K08E85E 2008 EE85 (arc=18 days, H=22.8 ~93m) from Spacewatch 0.9m (March 26.22p1)
K08E84X 2008 EX84 (arc=20 days, H=22.3 ~117m) from MLS (April 1.27-28p4)
K08E09E 2008 EE9 (arc=24 days, H=22.3 ~117m) from Spacewatch 0.9m (April 1.20-23p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K08D05L 2008 DL5 (arc=33 days, H=21.9 ~141m) from Spacewatch 1.8m (April 1.12-14p3)
Observations of other objects
K08G00D 2008 GD (q=0.257 AU, arc=1 day, H=19.4 ~446m) from New Millennium Obs. (April 1.89-90p6)
K08F00G 2008 FG (i=40.1°, arc=5 days, H=19.8 ~371m) from Spacewatch 1.8m (April 1.26-27p3)
K08E85M 2008 EM85 (arc=19 days, H=19.7 ~389m) from Verona Obs. (April 1.88-90p4)
K08E09B 2008 EB9 (arc=24 days, H=20.4 ~282m) from Spacewatch 1.8m (April 1.17-18p3)
K08D05K 2008 DK5 (arc=34 days, H=21.4 ~178m) from Spacewatch 1.8m (April 2.13-14p3)
K08D00E 2008 DE (arc=50 days, H=19.4 ~446m) from La Fecha Obs. (April 1.00-05p3)
K07V04Q 2007 VQ4 (arc=3 opp, H=15.8 ~2.34 km, q=1.271 AU) from Verona Obs. (April 1.83-85p4)
K07M00R 2007 MR (arc=2 opp, H=21.7 ~155m) from Spacewatch 1.8m (April 1.49-51p3)
K06B55G 2006 BG55 (arc=3 opp, H=18.4 ~708m) from CSS (April 1.37-39p4), Verona Obs. (April 1.86p3), and Atlante Obs. (April 1.94-96p3)
K05S01R 2005 SR1 (arc=2 opp, H=19.2 ~490m) from Spacewatch 0.9m (March 26.17-21p3)
K05N07B 2005 NB7 (arc=3 opp, H=18.7 ~616m) from GRO (April 2.10p10)
K05G59E 2005 GE59 (arc=3 opp, H=18.0 ~851m) from Spacewatch 0.9m (March 29.26-30p3)
K04V14W 2004 VW14 (arc=4 opp, H=19.4 ~446m) from La Fecha Obs. (April 2.12-15p4)
K04F31E 2004 FE31 (arc=4 opp, H=18.2 ~776m) from Spacewatch 0.9m (March 26.30-32p2)
K04C02R 2004 CR2 (arc=2 opp, H=19.4 ~446m) from Spacewatch 0.9m (April 1.14-22p6)
G2422 162422 2000 EV70 from Spacewatch 0.9m (March 27.29-33p3)
F2942 152942 2000 FN10 from CSS (April 1.18-21p4)
F2679 152679 1998 KU2 from Spacewatch 0.9m (March 26.35-39p2)
E4901 144901 2004 WG1 from CSS (April 1.18-21p4)
D7084 137084 1998 XS16 from MLS (April 1.14-15p4)
68359 68359 2001 OZ13 from CSS (April 1.12-14p4)
40267 40267 1999 GJ4 from CSS (April 1.30-32p4)
22099 22099 2000 EX106 from CSS (April 1.23-25p4)
16657 16657 1993 UB from CSS (April 1.30-32p4)
10145 10145 1994 CK1 from Spacewatch 0.9m (March 26.23p1)
09400 9400 1994 TW1 from MLS (April 1.30-32p4)
09162 9162 1987 OA from Naef Obs. (April 1.82-85p2)
04954 4954 Eric (1990 SQ) from Mt. Tuffley Obs. (April 1.87p3) and La Fecha Obs. (April 1.95-98p3)
04544 4544 Xanthus (1989 FB) from CSS (April 1.12-14p4)
03288 3288 Seleucus (1982 DV) from Mt. Tuffley Obs. (April 1.95-97p3)
01864 1864 Daedalus (1971 FA) from Spacewatch 0.9m (April 1.20-23p3)
01036 1036 Ganymed (1924 TD) from Mt. Tuffley Obs. (April 1.84-86p3)

MPEC 2008-G10 - "03:33 UT" - Comet P/1998 X1 = 2006 B7 (ODAS)

PK06B070 P/2006 B7 (q=1.981 AU, Q=5.186 AU, TP=2005 May 3.25821 TT) from MLS (2005 Oct. 7.50-51p4)
PJ98X010 P/1998 X1 (ODAS) (q=1.974 AU, Q=5.180 AU, TP=1998 July 20.93950 TT)

Observers on 2 April '08

Seventeen observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 3 in MPECs 2008-G12, 2008-G13 & 2008-G14 -- 2008 GJ, 2008 GH, 2008 GG
`J51`	Atlante Obs. in the Canary Islands, 1 in MPEC 2008-G11 -- 2006 BG55
`703`	Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2008-G11 -- 2008 ES, 2006 BG55, 68359, 40267, 22099, 16657, 152942, 144901, 4544
`J95`	Great Shefford Obs. in England, 3 in MPECs 2008-G11 & 2008-G12 -- 2008 GG, 2008 FX6, 2008 FW6
`H51`	Greiner Research Obs. (GRO) in Wisconsin, 2 in MPEC 2008-G11 -- 2008 FO, 2005 NB7
`J34`	La Fecha Obs. in Spain, 3 in MPEC 2008-G11 -- 2008 DE, 2004 VW14, 4954
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2008-G10, 2008-G11, 2008-G12, 2008-G13 & 2008-G14 -- 2008 GJ, 2008 GH, 2008 GG, 2008 FN, 2008 EX84, P/2006 B7, 137084, 9400
`J93`	Mt. Tuffley Obs. in England, 3 in MPEC 2008-G11 -- 4954, 3288, 1036
`A13`	Naef Obs. in Switzerland, 1 in MPEC 2008-G11 -- 9162
`A24`	New Millennium Obs. in Italy, 1 in MPEC 2008-G11 -- 2008 GD
`6581`	Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2008-G12 -- 2008 GG
`C494`	HI1-A instrument (4) aboard STEREO-A in heliocentric orbit leading Earth, 1 in MPEC 2008-G15 -- C/2007 F2
`C495`	COR2-A instrument (5) aboard STEREO-A in heliocentric orbit leading Earth, 2 in MPEC 2008-G15 -- C/2007 S5, C/2007 F2
`C504`	HI1-B instrument (4) aboard STEREO-B in heliocentric orbit trailing Earth, 1 in MPEC 2008-G15 -- C/2007 S5
`C505`	COR2-B instrument (5) aboard STEREO-B in heliocentric orbit trailing Earth, 2 in MPEC 2008-G15 -- C/2007 S5, C/2007 F2
`691`	Spacewatch 0.9m telescope in Arizona, 11 in MPEC 2008-G11 -- 2008 FS6, 2008 EE9, 2008 EE85, 2005 SR1, 2005 GE59, 2004 FE31, 2004 CR2, 162422, 152679, 10145, 1864
`291`	Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2008-G11 -- 2008 FW6, 2008 FW5, 2008 FT6, 2008 FS6, 2008 FN, 2008 FH, 2008 FG, 2008 FF5, 2008 ER7, 2008 EB9, 2008 EA9, 2008 DL5, 2008 DK5, 2007 MR
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-G11 -- 2008 FE5
`A48`	Verona Obs. in Italy, 3 in MPEC 2008-G11 -- 2008 EM85, 2007 VQ4, 2006 BG55

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

Impact Risk Monitoring on 2 April '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 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 GJ	JPL Sentry	1856	2014-2103	44	4.6e-08	-4.67	-5.41	0	JPL: "Analysis based on 10 observations spanning .96108 days (2008-Apr-01.29788 to 2008-Apr-02.258963)." Diameter approximately 0.351 km. from mean, weighted H=19.9.

2008 GG	JPL Sentry	2008	2025-2097	9	1.2e-09	-6.60	-7.24	0	JPL: "Analysis based on 17 observations spanning .92699 days (2008-Apr-01.27102 to 2008-Apr-02.19801)." Diameter approximately 0.213 km. from mean, weighted H=21.0.

2008 GF	JPL Sentry	0341	2015	1	1.4e-10	-6.72	-6.72	0	JPL: "Analysis based on 15 observations spanning .73741 days (2008-Apr-01.1933 to 2008-Apr-01.93071)." Diameter approximately 0.280 km. from mean, weighted H=20.4.

2008 FK7	NEODyS	1500	2013-2085	29	8.5e-09	-6.68	-7.03	0	NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2008/03/31.402 to 2008/04/01.417."

2008 FW6	JPL Sentry	1459	R E M O V E D						JPL: Risk listing removed at 1241 UTC.

2008 FT6	NEODyS	1501	2011-2084	15	1.92e-08	-3.00	-3.11	0	NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2008/03/29.380 to 2008/04/01.422."
2008 FT6	JPL Sentry	1459	2020-2093	12	1.0e-08	-3.77	-4.00	0	JPL: "Analysis based on 15 observations spanning 3.0421 days (2008-Mar-29.3796 to 2008-Apr-01.42174)." Diameter approximately 1.400 km. from mean, weighted H=16.9.

2008 FF5	NEODyS	1501	2029-2087	5	3.75e-07	-4.76	-5.06	0	NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2008/03/28.323 to 2008/04/01.332."
2008 FF5	JPL Sentry	1459	2029-2095	7	4.0e-07	-4.77	-5.14	0	JPL: "Analysis based on 41 observations spanning 4.0089 days (2008-Mar-28.32219 to 2008-Apr-01.33109)." Diameter approximately 0.080 km. from mean, weighted H=23.1.

2008 FN	NEODyS	1501	2020-2090	24	2.61e-08	-3.67	-4.05	0	NEODyS: "Based on 35 optical observations (of which 0 are rejected as outliers) from 2008/03/27.460 to 2008/04/01.513."
2008 FN	JPL Sentry	1459	2020-2105	17	2.3e-08	-3.71	-4.06	0	JPL: "Analysis based on 35 observations spanning 5.0528 days (2008-Mar-27.45915 to 2008-Apr-01.51199)." Diameter approximately 0.751 km. from mean, weighted H=18.3.

2008 EA9	NEODyS	1501	2063-2088	17	3.71e-05	-6.13	-6.67	0	NEODyS: "Based on 56 optical observations (of which 1 are rejected as outliers) from 2008/03/06.406 to 2008/04/01.345."
2008 EA9	JPL Sentry	1459	2068-2105	8	3.1e-05	-6.22	-6.67	0	JPL: "Analysis based on 55 observations spanning 25.938 days (2008-Mar-06.40551 to 2008-Apr-01.34377)." Diameter approximately 0.010 km. from mean, weighted H=27.7.

2008 ER7	NEODyS	1501	2077-2089	3	4.27e-07	-3.96	-4.09	0	NEODyS: "Based on 71 optical observations (of which 0 are rejected as outliers) from 2008/03/06.337 to 2008/04/01.320."
2008 ER7	JPL Sentry	1459	2077-2104	8	3.5e-06	-3.14	-3.40	0	JPL: "Analysis based on 71 observations spanning 25.983 days (2008-Mar-06.33608 to 2008-Apr-01.31941)." Diameter approximately 0.320 km. from mean, weighted H=20.1.

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 April '08

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

2158	Grabbed MPEC 2008-G15 - Comets C/2007 F2, 2007 S5 (SOHO) - see above
2008	Noted that JPL Sentry has posted 2008 GG as an impact risk - see above
1856	Noted that JPL Sentry has posted 2008 GJ as an impact risk - see above
1727	Grabbed MPEC 2008-G14 - 2008 GJ - see above
1608	Grabbed MPEC 2008-G12 - 2008 GG - see above Grabbed MPEC 2008-G13 - 2008 GH - see above
1501	Noted that NEODyS has updated its 2008 EA9 risk assessment - see above Noted that NEODyS has updated its 2008 ER7 risk assessment - see above Noted that NEODyS has updated its 2008 FF5 risk assessment - see above Noted that NEODyS has updated its 2008 FN risk assessment - see above Noted that NEODyS has updated its 2008 FT6 risk assessment - see above
1500	Grabbed MPEC 2008-G11 - Daily Orbit Update - see above
1459	Noted that JPL Sentry has updated its 2008 EA9 risk assessment - see above Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above Noted that JPL Sentry has updated its 2008 FF5 risk assessment - see above Noted that NEODyS has posted 2008 FK7 as an impact risk - see above Noted that JPL Sentry has updated its 2008 FN risk assessment - see above Noted that JPL Sentry has updated its 2008 FT6 risk assessment - see above Noted that JPL Sentry has removed 2008 FW6 as an impact risk - see above
0554	Grabbed MPEC 2008-G10 - Comet P/1998 X1 = 2006 B7 (ODAS) - see above
0341	Noted that JPL Sentry has posted 2008 GF as an impact risk - see above

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