2008-06-06 Tracking News

Contents on 6 June '08

Radar Astrometry -- one object
IAU Minor Planet Center
- NEOCP Activity -- four listings: 2 new, 2 updated
- New MPECs -- two MPECs
Observers -- fifteen observing facilities
Impact Risk Monitoring -- four 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

NOTE: These news page will update less often and at sometimes irregular intervals from May 31st through approximately June 7th.

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 6 June '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 2358 UTC when the database was dated 6 June

2003 QB30 from Arecibo (2003 Aug. 26.10 velocity & 26.11 range)

NEOCP Activity on 6 June '08

The MPC's NEO Confirmation Page has 4 listings: 2 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had two new and two updated listings. Of these, three were "one nighters." So far The Tracking News has counted a total of five objects listed on the NEOCP at some point today.

New MPECs on 6 June '08

Minor Planet Electronic Circulars

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

MPEC 2008-L28 time-stamped "06:08 UT" - Daily Orbit Update - see below
MPEC 2008-L29 time-stamped "19:33 UT" - Comets C/2008 G5, 2008 G6, 2008 H2, 2008 H3 (SOHO)

MPEC 2008-L29 - "19:33 UT" - Comets C/2008 G5, 2008 G6, 2008 H2, 2008 H3 (SOHO)

CK08H030 C/2008 H3 from the LASCO Coronagraph 3 aboard the Solar & Heliospheric Obs. (SOHO) (April 16.72-78p8 & 16.82-85p4) and the LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. (SOHO) (April 16.89-10p28)
CK08H020 C/2008 H2 from SOHO C2 (April 16.59-73p20)
CK08G060 C/2008 G6 from SOHO C2 (April 12.92-93p4 & 12.98-09p16)
CK08G050 C/2008 G5 from SOHO C2 (April 10.02-09p10)

<< DOU on 6 June '08 >> MPEC 2008-L28 - "06:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08L02G 2008 LG2 (small asteroid, arc=3 days, H=25.2 ~31m) from Great Shefford Obs. (June 5.00-01p3)
K08L00B 2008 LB (small asteroid, Q=4.059 AU, arc=4 days, H=25.8 ~23m) from the Spacewatch 1.8m telescope (June 5.30-31p3)
K08L00A 2008 LA (small asteroid, arc=4 days, H=23.2 ~78m) from Astronomical Research Obs. (ARO) (June 2.15-17p3) and the Mt. Lemmon Survey (MLS) (June 5.19-20p4)
K08K11N 2008 KN11 (small asteroid, arc=5 days, H=23.2 ~78m) from ARO (June 2.22-25p3)
Observations of recently (no longer) risk-listed objects
K08K02X 2008 KX2 (small asteroid, arc=7 days, H=25.0 ~34m) from Faulkes Telescope South (June 5.50-51p4)
Observations of small asteroids (H>22.0)
K08L02H 2008 LH2 (arc=2 days, H=24.3 ~47m) from Great Shefford Obs. (June 5.98-99p3)
Observations of other objects
K08K28V 2008 KV28 (arc=3 days, H=20.1 ~323m) from ARO (June 2.19-21p3)
K08K12B 2008 KB12 (Q=4.481 AU, arc=6 days, H=21.4 ~178m) from Las Campanas Obs. (June 5.17-18p8)
K08K02W 2008 KW2 (i=37.1°, arc=9 days, H=19.7 ~389m) from Jim Young via Table Mtn. Obs. (June 6.17-22p4)
K08J20M 2008 JM20 (arc=27 days, H=20.9 ~224m) from Spacewatch 1.8m (June 6.22-23p3)
K08J14P 2008 JP14 (arc=35 days, H=19.4 ~446m) from Petit Jean Mtn. South Obs. (PJMSO) (June 5.27-29p6)
K08H03S 2008 HS3 (arc=36 days, H=21.7 ~155m) from PJMSO (June 5.26-27p6)
K08E05V 2008 EV5 (arc=94 days, H=19.9 ~355m) from Spacewatch 1.8m (June 6.16-17p2)
K08A32F 2008 AF32 (arc=128 days, H=21.0 ~214m) from David Tholen's team on Mauna Kea (May 20.46-48p3)
K07V04Q 2007 VQ4 (arc=3 opp, H=16.2 ~1.95 km) from PJMSO (June 5.23p6)
G3335 163335 2002 LJ from the Spacewatch 0.9m telescope (June 5.36-40p3)
D7170 137170 1999 HF1 from PJMSO (June 5.25-26p5) and Balzaretto Obs. (June 5.88-89p6)
08567 8567 1996 HW1 from LINEAR (June 5.38-41p4)
03288 3288 Seleucus (1982 DV) from Mt. Tuffley Obs. (June 5.95-96p4)

Observers on 6 June '08

Fifteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`251`	Arecibo in Puerto Rico, 1 in radar -- 2003 QB30
`H55`	Astronomical Research Obs. (ARO) in Illinois, 3 in MPEC 2008-L28 -- 2008 LA, 2008 KV28, 2008 KN11
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2008-L28 -- 137170
`E10`	Faulkes Telescope South in New South Wales, 1 in MPEC 2008-L28 -- 2008 KX2
`J95`	Great Shefford Obs. in England, 2 in MPEC 2008-L28 -- 2008 LH2, 2008 LG2
`704`	LINEAR in New Mexico, 1 in MPEC 2008-L28 -- 8567
`304`	Las Campanas Obs. in Chile, 1 in MPEC 2008-L28 -- 2008 KB12
`5682`	David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-L28 -- 2008 AF32
`G96`	Mt. Lemmon Survey in Arizona, 1 in MPEC 2008-L28 -- 2008 LA
`J93`	Mt. Tuffley Obs. in England, 1 in MPEC 2008-L28 -- 3288
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2008-L28 -- 2008 JP14, 2008 HS3, 2007 VQ4, 137170
`2492`	LASCO Coronagraph 2 (SOHO C2) aboard the Solar & Heliospheric Obs. (SOHO) in Earth-Sun L1 HALO orbit, 4 in MPEC 2008-L29 -- C/2008 H3, C/2008 H2, C/2008 G6, C/2008 G5
`2493`	LASCO Coronagraph 3 aboard the Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2008-L29 -- C/2008 H3
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2008-L28 -- 163335
`291`	Spacewatch 1.8m telescope in Arizona, 3 in MPEC 2008-L28 -- 2008 LB, 2008 JM20, 2008 EV5
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-L28 -- 2008 KW2

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

Impact Risk Monitoring on 6 June '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 LG2	NEODyS	1237	2027-2088	11	1.49e-05	-5.03	-5.30	0	NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2008/06/03.318 to 2008/06/06.006."
2008 LG2	JPL Sentry	1236	2027-2095	14	1.5e-05	-5.03	-5.37	0	JPL: "Analysis based on 11 observations spanning 2.6880 days (2008-Jun-03.31737 to 2008-Jun-06.00539)." Diameter approximately 0.032 km. from mean, weighted H=25.1.

2008 LB	NEODyS	1237	2064	2	3.74e-09	-8.88	-8.94	0	NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2008/06/01.274 to 2008/06/05.309."

2008 LA	NEODyS	1237	2015-2088	101	3.39e-05	-3.66	-4.40	0	NEODyS: "Based on 29 optical observations (of which 0 are rejected as outliers) from 2008/06/01.170 to 2008/06/05.199."
2008 LA	JPL Sentry	1236	2015-2107	110	3.5e-05	-3.64	-4.36	0	JPL: "Analysis based on 29 observations spanning 4.0291 days (2008-Jun-01.16922 to 2008-Jun-05.19837)." Diameter approximately 0.075 km. from mean, weighted H=23.3.

2008 KN11	NEODyS	1237	2035-2046	5	6.64e-07	-5.07	-5.32	0	NEODyS: "Based on 56 optical observations (of which 0 are rejected as outliers) from 2008/05/30.335 to 2008/06/04.214."
2008 KN11	JPL Sentry	1236	2037-2046	5	6.8e-07	-5.07	-5.33	0	JPL: "Analysis based on 56 observations spanning 4.8790 days (2008-May-30.33435 to 2008-Jun-04.21336)." Diameter approximately 0.079 km. from mean, weighted H=23.2.

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 6 June '08

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

2358	Noted Radar Astrometry database addition - see above
2142	Grabbed MPEC 2008-L29 - Comets C/2008 G5, 2008 G6, 2008 H2, 2008 H3 (SOHO) - see above
1237	Noted that NEODyS has updated its 2008 KN11 risk assessment - see above Noted that NEODyS has updated its 2008 LA risk assessment - see above Noted that NEODyS has updated its 2008 LG2 risk assessment - see above Grabbed MPEC 2008-L28 - Daily Orbit Update - see above
1236	Noted that JPL Sentry has updated its 2008 KN11 risk assessment - see above Noted that JPL Sentry has updated its 2008 LA risk assessment - see above Noted that NEODyS has reposted 2008 LB as an impact risk - see above Noted that JPL Sentry has updated its 2008 LG2 risk assessment - see above

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