2008-04-03 Tracking News

Contents on 3 April '08

IAU Minor Planet Center
- NEOCP Activity -- six listings: 6 updated
- New MPECs -- four MPECs
Observers -- fourteen 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 3 April '08

The MPC's NEO Confirmation Page has 6 listings: 6 updated

When last checked at 2356 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had six updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of seven 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 April '08

Minor Planet Electronic Circulars

As of last check at 2357 UTC, there have been four MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-G16 time-stamped "06:08 UT" - Daily Orbit Update - see below
MPEC 2008-G17 time-stamped "16:23 UT" - Comet C/2008 E3 (Garradd) - see below
MPEC 2008-G18 time-stamped "17:11 UT" - 2008 CP23 - see below
MPEC 2008-G19 time-stamped "18:38 UT" - 2008 GK

MPEC 2008-G19 - "18:38 UT" - 2008 GK

K08G00K 2008 GK (risk-listed, Earth MOID=6.5 LD, H=23.5 ~68m) was discovered at 0512 UT on 3 April by the Mt. Lemmon Survey (MLS), which observed it at April 3.22-26p8 and 3.34p4. The discovery was confirmed by Dave Balam via Plaskett 1.8m Telescope (April 3.28p3), the Spacewatch 1.8m telescope (April 3.29p3), and Sabino Canyon Obs. (April 3.35-36p3).

MPEC 2008-G18 - "17:11 UT" - 2008 CP23

K08C23P 2008 CP23 (H=19.6 ~407m) from the Spacewatch 0.9m telescope (Feb. 12.28-32p3), MLS (Feb. 26.39-41p4), the Catalina Sky Survey (CSS) (March 10.31-33p4 & 24.20-22p4), and Bisei Spaceguard Center (April 3.53-56p5)

MPEC 2008-G17 - "16:23 UT" - Comet C/2008 E3 (Garradd)

CK08E030 C/2008 E3 (Garradd) (i=105.0°, q=5.536 AU, TP=2008 July 29.921 TT) from Auckland Obs. (April 2.61-62p4 & 3.60-61p3)

<< DOU on 3 Apr. '08 >> MPEC 2008-G16 - "06:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08G00F 2008 GF (arc=2 days, H=20.5 ~269m) from Great Shefford Obs. (April 2.95p2) and Spacewatch 1.8m (April 3.12p3)
K08F07L 2008 FL7 (small asteroid, arc=2 days, H=24.3 ~47m) from Astronomical Research Obs. (ARO) (April 2.32p3)
K08F00N 2008 FN (i=45.3°, arc=6 days, H=18.4 ~708m) from ARO (April 2.35-36p4) and Spacewatch 1.8m (April 2.37-38p3)
K08E07R 2008 ER7 (arc=28 days, H=20.0 ~339m) from Spacewatch 1.8m (April 3.17-18p3)
Observations of recently (no longer) risk-listed objects
K08F05W 2008 FW5 (almost small, arc=5 days, H=21.9 ~141m) from ARO (April 2.37-38p3)
K08F00K 2008 FK (small asteroid, arc=4 days, H=27.3 ~12m) from Spacewatch 0.9m (March 30.25-28p3)
K08E08D 2008 ED8 (small asteroid, arc=25 days, H=23.9 ~56m) from ARO (April 2.39-42p3)
Observations of small asteroids (H>22.0)
K08F00J 2008 FJ (arc=6 days, H=24.8 ~37m) from ARO (April 2.27-30p3 at V=22.1-2)
K08F00C 2008 FC (arc=10 days, H=24.8 ~37m) from ARO (April 2.34-35p3)
Observations of almost-small asteroids (21.7<H<=22.0)
K08F05G 2008 FG5 (arc=5 days, H=22.0 ~135m) from Spacewatch 0.9m (March 31.29-32p3), Greiner Research Obs. (GRO) (April 2.29-30p19), and ARO (April 2.31p3)
Observations of other objects
K08G00D 2008 GD (q=0.266 AU, arc=1 day, H=19.8 ~371m) from GRO (April 2.13-14p9)
K08F06U 2008 FU6 (arc=4 days, H=17.9 ~891m) from GRO (April 2.32-33p19)
K07V04Q 2007 VQ4 (arc=3 opp, H=15.8 ~2.34 km, q=1.271 AU) from Remanzacco Obs. (April 2.85-88p3)
K04RA9Y 2004 RY109 (arc=3 opp, H=19.0 ~537m) from Spacewatch 0.9m (March 31.14-17p3)
K04F11G 2004 FG11 (arc=2 opp, H=21.0 ~214m) from GRO (April 2.33-34p14)
K04C02R 2004 CR2 (arc=2 opp, H=19.3 ~467m) from LINEAR (April 2.13-18p5)
K03G00W 2003 GW (i=49.4°, arc=3 opp, H=16.7 ~1.55 km) from Petit Jean Mtn. South Obs. (PJMSO) (April 2.24p5)
K02F05W 2002 FW5 (i=46.4°, arc=3 opp, H=19.4 ~446m) from GRO (April 2.28-29p20) and LINEAR (April 2.29-34p5)
J99F00A 1999 FA (arc=2 opp, H=20.6 ~257m) from ARO (April 2.43-44p3)
G2422 162422 2000 EV70 from Spacewatch 0.9m (March 31.24-28p3)
86819 86819 2000 GK137 from Spacewatch 0.9m (March 31.18-21p2)
53435 53435 1999 VM40 from Spacewatch 0.9m (April 2.35-38p3)
53319 53319 1999 JM8 from LINEAR (April 2.35-40p5)
41429 41429 2000 GE2 from LINEAR (April 2.13-17p4)
24445 24445 2000 PM8 from Spacewatch 0.9m (April 2.34-38p3)
09162 9162 1987 OA from LINEAR (April 2.18-23p5)
07977 7977 1977 QQ5 from MLS (April 2.13-15p4)

Observers on 3 April '08

Fourteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 8 in MPEC 2008-G16 -- 2008 FW5, 2008 FN, 2008 FL7, 2008 FJ, 2008 FG5, 2008 FC, 2008 ED8, 1999 FA
`467`	Auckland Obs. in New Zealand, 1 in MPEC 2008-G17 -- C/2008 E3
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2008-G18 -- 2008 CP23
`703`	Catalina Sky Survey in Arizona, 1 in MPEC 2008-G18 -- 2008 CP23
`J95`	Great Shefford Obs. in England, 1 in MPEC 2008-G16 -- 2008 GF
`H51`	Greiner Research Obs. (GRO) in Wisconsin, 5 in MPEC 2008-G16 -- 2008 GD, 2008 FU6, 2008 FG5, 2004 FG11, 2002 FW5
`704`	LINEAR in New Mexico, 5 in MPEC 2008-G16 -- 2004 CR2, 2002 FW5, 53319, 41429, 9162
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2008-G16, 2008-G18 & 2008-G19 -- 2008 GK, 2008 CP23, 7977
`H45`	Petit Jean Mtn. South Obs. in Arkansas, 1 in MPEC 2008-G16 -- 2003 GW
`6581`	Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2008-G19 -- 2008 GK
`473`	Remanzacco Obs. in Italy, 1 in MPEC 2008-G16 -- 2007 VQ4
`854`	Sabino Canyon Obs. in Arizona, 1 in MPEC 2008-G19 -- 2008 GK
`691`	Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2008-G16 & 2008-G18 -- 2008 FK, 2008 FG5, 2008 CP23, 2004 RY109, 86819, 53435, 24445, 162422
`291`	Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2008-G16 & 2008-G19 -- 2008 GK, 2008 GF, 2008 FN, 2008 ER7

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

Impact Risk Monitoring on 3 April '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2356 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 GK	JPL Sentry	2259	2011-2108	152	2.0e-07	-5.28	-6.05	0	JPL: "Analysis based on 21 observations spanning .13815 days (2008-Apr-03.21727 to 2008-Apr-03.35542)." Diameter approximately 0.069 km. from mean, weighted H=23.5.

2008 GJ	NEODyS	1348	2034-2059	3	5.32e-10	-6.85	-6.98	0	NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/04/01.299 to 2008/04/02.260."

2008 GH	NEODyS	1348	2075-2087	2	6.07e-11	-9.45	-9.60	0	NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2008/04/01.298 to 2008/04/02.222."

2008 GG	NEODyS	1535	2020-2070	6	9.07e-09	-5.88	-5.89	0	NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2008/04/01.272 to 2008/04/02.199."

2008 GF	JPL Sentry	1347	R E M O V E D						JPL: Risk listing removed at 1053 UTC.

2008 FL7	JPL Sentry	1347	R E M O V E D						JPL: Risk listing removed at 1132 UTC.

2008 FN	NEODyS	1348	2023-2052	6	2.74e-09	-4.68	-5.16	0	NEODyS: "Based on 42 optical observations (of which 0 are rejected as outliers) from 2008/03/27.460 to 2008/04/02.381."
2008 FN	JPL Sentry	1347	2023-2086	8	3.3e-09	-4.67	-5.24	0	JPL: "Analysis based on 42 observations spanning 5.9207 days (2008-Mar-27.45915 to 2008-Apr-02.37984)." Diameter approximately 0.740 km. from mean, weighted H=18.3.

2008 ER7	NEODyS	1348	2073-2089	4	4.76e-07	-3.91	-4.04	0	NEODyS: "Based on 74 optical observations (of which 0 are rejected as outliers) from 2008/03/06.337 to 2008/04/03.178."
2008 ER7	JPL Sentry	1347	2077-2104	6	1.6e-06	-3.46	-3.88	0	JPL: "Analysis based on 74 observations spanning 27.841 days (2008-Mar-06.33608 to 2008-Apr-03.1774)." 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 3 April '08

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

2259	Noted that JPL Sentry has posted 2008 GK as an impact risk - see above
1944	Grabbed MPEC 2008-G19 - 2008 GK - see above
1734	Grabbed MPEC 2008-G18 - 2008 CP23 - see above
1639	Grabbed MPEC 2008-G17 - Comet C/2008 E3 (Garradd) - see above
1534	Noted that NEODyS has posted 2008 GG as an impact risk - see above
1348	Noted that NEODyS has updated its 2008 ER7 risk assessment - see above Noted that NEODyS has updated its 2008 FN risk assessment - see above
1347	Noted that JPL Sentry has updated its 2008 ER7 risk assessment - see above Noted that JPL Sentry has removed 2008 FL7 as an impact risk - see above Noted that JPL Sentry has updated its 2008 FN risk assessment - see above Noted that JPL Sentry has removed 2008 GF as an impact risk - see above Noted that NEODyS has posted 2008 GH as an impact risk - see above Noted that NEODyS has posted 2008 GJ as an impact risk - see above Grabbed MPEC 2008-G16 - Daily Orbit Update - see above

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