2008-06-08 Tracking News

Contents on 8 June '08

IAU Minor Planet Center
- NEOCP Activity -- three listings: 1 new, 2 updated
- New MPECs -- two MPECs
Observers -- fourteen 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 pages will update less often and at irregular intervals through June 12th.

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 8 June '08

The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated

When last checked at 2354 UTC today, the Minor Planet Center's NEO discovery Confirmation Page (NEOCP) had one new and two updated listings. Of these, two were "one nighters." So far The Tracking News has counted a total of four 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 8 June '08

Minor Planet Electronic Circulars

As of last check at 2354 UTC, there have been two MPECs issued today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2008-L31 time-stamped "06:08 UT" - Daily Orbit Update - see below
MPEC 2008-L32 time-stamped "21:48 UT" - Comet C/2008 J4 (McNaught)

MPEC 2008-L32 - "21:48 UT" - Comet C/2008 J4 (McNaught)

CK08J040 C/2008 J4 (McNaught) (i=87.5°, q=0.448 AU, TP=2008 June 19.509 TT) from Ageo Obs. (May 20.76-77p4 & 25.74-75p2) and Tiki Obs. (May 23.65p1)

<< DOU on 8 June '08 >> MPEC 2008-L31 - "06:08 UT" - Daily Orbit Update

Observations of risk-listed objects
K08L02G 2008 LG2 (small asteroid, arc=4 days, H=25.4 ~28m) from Petit Jean Mtn. South Obs. (PJMSO) (June 7.33-34p6) and Tiki Obs. (June 7.40-42p2)
K08L00D 2008 LD (small asteroid, arc=5 days, H=28.9 ~6m) from Magdalena Ridge Obs. (MRO) (June 7.33-35p3)
K08K11N 2008 KN11 (small asteroid, arc=8 days, H=23.2 ~78m) from Desert Moon Obs. (June 7.33-36p3)
K08H04U 2008 HU4 (small asteroid, arc=38 days, H=28.3 ~7m) from MRO (June 7.26-27p3)
Observations of recently (no longer) risk-listed objects
K08K05Z 2008 KZ5 (arc=9 days, H=20.0 ~339m) from Desert Moon Obs. (June 7.26-31p3)
Observations of small asteroids (H>22.0)
K08J24P 2008 JP24 (arc=12 days, H=26.7 ~15m) from David Tholen's team on Mauna Kea (May 22.41p2)
Observations of other objects
K08K06E 2008 KE6 (arc=9 days, H=20.6 ~257m) from Desert Moon Obs. (June 7.39-44p3)
K08K02W 2008 KW2 (i=37.4°, arc=10 days, H=19.8 ~371m) from PJMSO (June 7.27-28p7)
K08K02V 2008 KV2 (arc=11 days, H=21.5 ~170m) from Jim Young via Table Mtn. Obs. (June 8.21-22p4)
K08K00Q 2008 KQ (arc=11 days, H=20.6 ~257m) from Jornada Obs. (June 7.23-25p3)
K08J19W 2008 JW19 (arc=30 days, H=20.8 ~234m) from the Spacewatch 1.8m telescope (June 7.16-17p3)
K08J19T 2008 JT19 (arc=31 days, H=20.0 ~339m) from Spacewatch 1.8m (June 7.24-26p3 at V=22.5)
K08J14P 2008 JP14 (arc=37 days, H=19.4 ~446m) from PJMSO (June 7.24-25p6)
K08H03S 2008 HS3 (arc=38 days, H=21.7 ~155m) from PJMSO (June 7.28-29p6)
K08G00X 2008 GX (arc=65 days, H=19.5 ~426m) from Desert Moon Obs. (June 7.15-23p3)
K07V04Q 2007 VQ4 (arc=3 opp, H=16.2 ~1.95 km) from PJMSO (June 7.22p5)
K07L00L 2007 LL (arc=2 opp, H=20.6 ~257m) from Greiner Research Obs. (GRO) (June 7.20p2) and PJMSO (June 7.34p5)
K05N07B 2005 NB7 (arc=3 opp, H=18.7 ~616m) from PJMSO (June 7.30-31p5)
K01Q34C 2001 QC34 (arc=2 opp, H=20.0 ~339m) from the Siding Spring Survey (SSS) (June 7.47-50p4)
K00AK5D 2000 AD205 (arc=2 opp, H=18.6 ~645m) from PJMSO (June 7.29-30p5)
J96F03R 1996 FR3 (arc=5 opp, H=16.4 ~1.78 km) from SSS (June 7.70-75p4)
H0891 170891 2004 TY16 from SSS (June 7.37-39p4)
G3000 163000 2001 SW169 from SSS (June 7.77-80p3)
G2723 162723 2000 VM2 from SSS (June 7.62-66p2)
D7170 137170 1999 HF1 from PJMSO (June 7.25-27p5)
35107 35107 1991 VH from PJMSO (June 7.31-32p5)
07092 7092 Cadmus (1992 LC) from Mt. Tuffley Obs. (June 7.95-96p3)
05626 5626 1991 FE from the Catalina Sky Survey (CSS) (June 7.20-23p4)
03288 3288 Seleucus (1982 DV) from CSS (June 7.16-18p4) and Mt. Tuffley Obs. (June 7.93p3)
01980 1980 Tezcatlipoca (1950 LA) from Mt. Tuffley Obs. (June 7.94p3)
01627 1627 Ivar (1929 SH) from 7300 Obs. (June 7.38-41p4)

Observers on 8 June '08

Fourteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`H07`	7300 Obs. in New Mexico, 1 in MPEC 2008-L31 -- 1627
`349`	Ageo Obs. in Japan, 1 in MPEC 2008-L32 -- C/2008 J4
`703`	Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2008-L31 -- 5626, 3288
`448`	Desert Moon Obs. in New Mexico, 4 in MPEC 2008-L31 -- 2008 KZ5, 2008 KN11, 2008 KE6, 2008 GX
`H51`	Greiner Research Obs. in Wisconsin, 1 in MPEC 2008-L31 -- 2007 LL
`715`	Jornada Obs. in New Mexico, 1 in MPEC 2008-L31 -- 2008 KQ
`H01`	Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPEC 2008-L31 -- 2008 LD, 2008 HU4
`5682`	David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2008-L31 -- 2008 JP24
`J93`	Mt. Tuffley Obs. in England, 3 in MPEC 2008-L31 -- 7092, 3288, 1980
`H45`	Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2008-L31 -- 2008 LG2, 2008 KW2, 2008 JP14, 2008 HS3, 2007 VQ4, 2007 LL, 2005 NB7, 2000 AD205, 35107, 137170
`E12`	Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2008-L31 -- 2001 QC34, 1996 FR3, 170891, 163000, 162723
`291`	Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2008-L31 -- 2008 JW19, 2008 JT19
`6735`	Jim Young via Table Mtn. Obs. in southern California, 1 in MPEC 2008-L31 -- 2008 KV2
`F85`	Tiki Obs. in Tahiti, 2 in MPECs 2008-L31 & 2008-L32 -- 2008 LG2, C/2008 J4

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

Impact Risk Monitoring on 8 June '08

**Summary Risk Table for Risk Assessments Updated Today** (last checks: NEODyS and JPL at 2354 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	JPL Sentry	1150	2038-2107	21	1.3e-04	-4.29	-4.31	0	JPL: "Analysis based on 33 observations spanning 4.0989 days (2008-Jun-03.31737 to 2008-Jun-07.41625)." Diameter approximately 0.029 km. from mean, weighted H=25.4.
2008 LG2	NEODyS	1148	2038-2084	19	1.23e-04	-4.29	-4.30	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2008/06/03.318 to 2008/06/07.417."

2008 LD	JPL Sentry	1150	2049-2108	53	4.3e-05	-6.63	-7.46	0	JPL: "Analysis based on 24 observations spanning 5.0627 days (2008-Jun-02.29145 to 2008-Jun-07.35417)." Diameter approximately 0.006 km. from mean, weighted H=28.9.
2008 LD	NEODyS	1150	2055-2090	25	2.43e-05	-6.83	-7.44	0	NEODyS: "Based on 25 optical observations (of which 1 are rejected as outliers) from 2008/06/02.292 to 2008/06/07.355."

2008 KN11	JPL Sentry	1150	2037-2046	5	6.8e-07	-5.08	-5.39	0	JPL: "Analysis based on 65 observations spanning 8.0279 days (2008-May-30.33435 to 2008-Jun-07.36226)." Diameter approximately 0.077 km. from mean, weighted H=23.2.
2008 KN11	NEODyS	1149	2030-2046	6	6.93e-07	-5.06	-5.37	0	NEODyS: "Based on 65 optical observations (of which 0 are rejected as outliers) from 2008/05/30.335 to 2008/06/07.363."

2008 HU4	NEODyS	2148	2073-2089	4	3.32e-06	-7.44	-7.72	0	NEODyS: "Based on 70 optical observations (of which 0 are rejected as outliers) from 2008/04/30.325 to 2008/06/07.271."
2008 HU4	JPL Sentry	1150	R E M O V E D						JPL: Risk listing removed at 0856 UTC.

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 8 June '08

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

2354	Grabbed MPEC 2008-L32 - Comet C/2008 J4 (McNaught) - see above
2148	Noted that NEODyS has updated its 2008 HU4 risk assessment - see above
1150	Noted that JPL Sentry has removed 2008 HU4 as an impact risk - see above Noted that JPL Sentry has updated its 2008 KN11 risk assessment - see above Noted that JPL Sentry has updated its 2008 LD risk assessment - see above Noted that NEODyS has updated its 2008 LD risk assessment - see above Noted that JPL Sentry has updated its 2008 LG2 risk assessment - see above
1149	Noted that NEODyS has updated its 2008 KN11 risk assessment - see above Grabbed MPEC 2008-L31 - Daily Orbit Update - see above
1148	Noted that NEODyS has updated its 2008 LG2 risk assessment - see above

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