2009-05-25 Tracking News

Contents on 25 May '09

IAU Minor Planet Center
- NEOCP Activity -- six listings: 1 new, 5 updated
- New MPECs -- two MPECs
Observers -- eleven 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.

NEOCP Activity on 25 May '09

The MPC's NEO Confirmation Page has 6 listings: 1 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and five updated listings. Of these, two were "one nighters."

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs on 25 May '09

Minor Planet Electronic Circulars

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

MPEC 2009-K43 time-stamped "05:08 UT" - 2004 LC2 = 2009 KG3 - see below
MPEC 2009-K44 time-stamped "06:07 UT" - Daily Orbit Update

<< DOU on 25 May '09 >> MPEC 2009-K44 - "06:07 UT" - Daily Orbit Update

Observations of risk-listed objects
K09K03G 2009 KG3 from Sandlot Obs. (May 24.21-23p4) and Saint-Barthelemy Obs. (May 24.92-95p3)
K09K00M 2009 KM (Q=4.303 AU, arc=7 days, H=20.2 ~309m) from Astronomical Research Obs. (ARO) (May 24.18-19p4)
K09K00K 2009 KK (arc=7 days, H=20.5 ~269m) from ARO (May 24.20-21p3)
Observations of recently (no longer) risk-listed objects
K09H82C 2009 HC82 (i=154.5°, Q=4.575 AU, arc=25 days, H=16.1 ~2.04 km, q=0.488 AU) from Gualba Obs. (May 23.94p1)
Observations of small asteroids (H>22.0)
K09K01Y 2009 KY1 (arc=5 days, H=23.7 ~62m) from ARO (May 24.24-25p3) and the Catalina Sky Survey (CSS) (May 24.28-30p4)
Observations of other objects
K09J02M 2009 JM2 (arc=12 days, H=19.3 ~467m) from Peschiera del Garda Obs. (May 23.91-93p5), ARO (May 24.22-23p8), and Starkenburg Obs. (May 24.88p3)
K09J01L 2009 JL1 (arc=37 days, H=21.1 ~204m) from CSS (May 24.28-30p4)
K09J01G 2009 JG1 (arc=20 days, H=20.8 ~234m) from CSS (May 24.28-30p3)
K09J00R 2009 JR (arc=21 days, H=21.3 ~186m) from ARO (May 24.23-25p3) and CSS (May 24.28-29p3)
K09H82D 2009 HD82 (arc=31 days, H=21.7 ~155m) from Modra Obs. (May 25.05-06p4)
K09E02Q 2009 EQ2 (arc=79 days, H=20.7 ~245m) from Modra Obs. (May 25.02-03p2)
K02L38T 2002 LT38 (arc=2 opp, H=19.9 ~355m) from El Condor Obs. (May 24.34-35p3)
F3311 153311 2001 MG1 from the Spacewatch 0.9m telescope (May 24.43-45p3)
05620 5620 Jasonwheeler (1990 OA) from Purple Mtn. Obs. XuYi Station (XuYi Sta.) (May 23.53-57p4)
04257 4257 Ubasti (1987 QA) from CSS (May 24.22-24p3)

MPEC 2009-K43 - "05:08 UT" - 2004 LC2 = 2009 KG3

K04L02C 2004 LC2 (H=18.7 ~616m)

Observers on 25 May '09

Eleven observing facilities appear in today's MPEC.

Code	Observer / observatory
`H55`	Astronomical Research Obs. (ARO) in Illinois, 5 in MPEC 2009-K44 -- 2009 KY1, 2009 KM, 2009 KK, 2009 JR, 2009 JM2
`703`	Catalina Sky Survey (CSS) in Arizona, 5 in MPEC 2009-K44 -- 2009 KY1, 2009 JR, 2009 JL1, 2009 JG1, 4257
`I21`	El Condor Obs. in Argentina, 1 in MPEC 2009-K44 -- 2002 LT38
`442`	Gualba Obs. in Spain, 1 in MPEC 2009-K44 -- 2009 HC82
`118`	Modra Obs. in Slovakia, 2 in MPEC 2009-K44 -- 2009 HD82, 2009 EQ2
`A53`	Peschiera del Garda Obs. in Italy, 1 in MPEC 2009-K44 -- 2009 JM2
`D29`	Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2009-K44 -- 5620
`B04`	Saint-Barthelemy Obs. in Italy, 1 in MPEC 2009-K44 -- 2009 KG3
`H36`	Sandlot Obs. in Kansas, 1 in MPEC 2009-K44 -- 2009 KG3
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-K44 -- 153311
`611`	Starkenburg Obs. in Germany, 1 in MPEC 2009-K44 -- 2009 JM2

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

Impact Risk Monitoring on 25 May '09

**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.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few objects.
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

2009 KG3	JPL Sentry	1529	R E M O V E D						JPL #2 for the day: Risk listing removed at 1518 UTC.

2009 KE3	NEODyS	1428	2018-2037	5	9.37e-10	-4.91	-5.20	0	NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2009/05/23.766 to 2009/05/24.646."
2009 KE3	JPL Sentry	0515	2018-2101	10	5.3e-09	-4.84	-5.39	0	JPL: "Analysis based on 10 observations spanning .88020 days (2009-May-23.76493 to 2009-May-24.64513)." Diameter approximately 0.830 km. from mean, weighted H=18.1.

2009 KC3	NEODyS	1428	2031-2055	8	6.0e-07	-2.61	-2.78	0	NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2009/05/04.595 to 2009/05/24.498."
2009 KC3	JPL Sentry	0515	2031-2103	10	6.7e-07	-2.56	-2.72	0	JPL: "Analysis based on 19 observations spanning 19.903 days (2009-May-04.59432 to 2009-May-24.49722)." Diameter approximately 0.910 km. from mean, weighted H=17.9.

2009 KM	JPL Sentry	1428	2091	1	3.0e-07	-4.02	-4.02	0	JPL: "Analysis based on 55 observations spanning 6.9343 days (2009-May-17.26047 to 2009-May-24.19476)." Diameter approximately 0.310 km. from mean, weighted H=20.2.

2009 KK	JPL Sentry	1529	2022-2038	5	4.6e-05	-1.49	-1.50	1	JPL: "Analysis based on 68 observations spanning 6.9541 days (2009-May-17.25987 to 2009-May-24.21401)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
2009 KK	NEODyS	1428	2022-2038	4	4.56e-05	-1.49	-1.50	1	NEODyS: "Based on 68 optical observations (of which 0 are rejected as outliers) from 2009/05/17.261 to 2009/05/24.215. NOTE: The Virtual Impactor in 2022/05/29.767 ... is rated as Torino Scale 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 25 May '09

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

1529	Noted that JPL Sentry has removed 2009 KG3 as an impact risk - see above Noted that JPL Sentry has updated its 2009 KK risk assessment - see above
1428	Noted that NEODyS has posted 2009 KC3 as an impact risk - see above Noted that NEODyS has posted 2009 KE3 as an impact risk - see above Noted that NEODyS has updated its 2009 KK risk assessment - see above Noted that JPL Sentry has updated its 2009 KM risk assessment - see above Grabbed MPEC 2009-K44 - Daily Orbit Update - see above
0515	Noted that JPL Sentry has posted 2009 KC3 as an impact risk - see above Noted that JPL Sentry has posted 2009 KE3 as an impact risk - see above Noted that JPL Sentry has posted 2009 KG3 as an impact risk - see above Grabbed MPEC 2009-K43 - 2004 LC2 = 2009 KG3 - see above

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