Contents  on 1 June '09

Resources:

The latest A/CC news is available via framed access, RSS news feed 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 1 June '09

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. So far The Tracking News has counted a total of seven listings on the NEOCP at some point today.

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 1 June '09

Minor Planet Electronic Circulars

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


MPEC 2009-L04 - "12:46 UT" - 2009 LA


MPEC 2009-L03 - "11:05 UT" - 2009 KV21


MPEC 2009-L02 - "11:02 UT" - 2009 KT21


<< DOU on 1 June '09 >>  MPEC 2009-L01 - "06:09 UT" - Daily Orbit Update

Observers  on 1 June '09

Seventeen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 7 in MPECs 2009-L01, 2009-L02 & 2009-L03 -- 2009 KY1, 2009 KV21, 2009 KT21, 2009 KL, 2009 KE5, 2009 KC7, 2009 BL2
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2009-L01 -- 212546
I32Beta Orionis Obs. in Argentina, 2 in MPEC 2009-L01 -- 136617, 3552
703Catalina Sky Survey in Arizona, 1 in MPEC 2009-L04 -- 2009 LA
I21El Condor Obs. in Argentina, 5 in MPEC 2009-L01 -- 2009 KE3, 2009 JM2, 2002 LT38, 207945, 194386
651Grasslands Obs. in Arizona, 1 in MPEC 2009-L04 -- 2009 LA
J95Great Shefford Obs. in England, 3 in MPECs 2009-L01 & 2009-L03 -- 2009 KV21, 2009 KR21, 2009 KL8
B12Koschny Obs. in The Netherlands, 2 in MPEC 2009-L01 -- 2009 BL2, 3103
J75La Sagra Obs. in Spain, 2 in MPEC 2009-L01 -- 2009 KY1, 2009 KD5
E17Leura Obs. in New South Wales, 1 in MPEC 2009-L01 -- 3988
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2009-L02, 2009-L03 & 2009-L04 -- 2009 LA, 2009 KV21, 2009 KT21
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2009-L01 -- 99799
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2009-L01, 2009-L02 & 2009-L03 -- 2009 KV21, 2009 KT21, 88254
A13Naef Obs. in Switzerland, 1 in MPEC 2009-L01 -- 2009 KL2
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-L04 -- 2009 LA
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2009-L01 -- 2009 KY1, 2009 HV58
291Spacewatch 1.8m telescope in Arizona, 4 in MPECs 2009-L01 & 2009-L02 -- 2009 KT21, 2009 HY51, 2009 HM73, 2009 HL21
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 June '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 KT21JPL Sentry13232019-2108351.4e-08-4.53-5.250JPL: "Analysis based on 25 observations spanning 3.0436 days (2009-May-29.30801 to 2009-Jun-01.35163)." Diameter approximately 0.644 km. from mean, weighted H=18.6.
2009 KR21JPL Sentry1323R E M O V E DJPL #2 for the day: Risk listing removed at 0851 UTC.
2009 KL2JPL Sentry1323R E M O V E DJPL: Risk listing removed at 0849 UTC.
2009 ED27JPL Sentry1704R E M O V E DJPL: Risk listing removed at 1647 UTC.
NEODyS1323R E M O V E D-

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 1 June '09

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

1704Noted that JPL Sentry has removed 2009 ED27 as an impact risk - see above
1323Noted that NEODyS has removed 2009 ED27 as an impact risk - see above
Noted that JPL Sentry has removed 2009 KL2 as an impact risk - see above
Noted that JPL Sentry has removed 2009 KR21 as an impact risk - see above
Noted that JPL Sentry has posted 2009 KT21 as an impact risk - see above
Grabbed MPEC 2009-L01 - Daily Orbit Update - see above
Grabbed MPEC 2009-L02 - 2009 KT21 - see above
Grabbed MPEC 2009-L03 - 2009 KV21 - see above
Grabbed MPEC 2009-L04 - 2009 LA - see above
0119Noted that JPL Sentry has posted 2009 KR21 as an impact risk - see above