Contents  on 4 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 4 June '09

Not active

The Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) was empty when checked at 2359 UTC, but earlier one listing was noted.

New MPECs  on 4 June '09

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there was one MPEC posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


<< DOU on 4 June '09 >>  MPEC 2009-L19 - "06:09 UT" - Daily Orbit Update

Observers  on 4 June '09

Thirteen observing facilities appeared in this day's MPEC.

CodeObserver / observatory
I08Alianza S4 Obs. in Argentina, 1 in MPEC 2009-L19 -- 2009 KJ22
H55Astronomical Research Obs. (ARO) in Illinois, 4 in MPEC 2009-L19 -- 2009 KL2, 2009 HG, 2009 HC, 2009 FN28
160Castelmartini Obs. in Italy, 5 in MPEC 2009-L19 -- 85989, 159399, 15745, 14402, 138883
B11Cima Rest Obs. in Italy, 1 in MPEC 2009-L19 -- 2008 WM64
448Desert Moon Obs. in New Mexico, 3 in MPEC 2009-L19 -- 2009 LE, 2009 EQ2, 54401
808El Leoncito Obs. in Argentina, 5 in MPEC 2009-L19 -- 2009 DL1, 17274, 136617, 9950, 3552
J95Great Shefford Obs. in England, 2 in MPEC 2009-L19 -- 2009 LE, 2009 LD
932McCarthy Obs. in Connecticut, 2 in MPEC 2009-L19 -- 2002 LV, 85989
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2009-L19 -- 54690
J69North Obs. in England, 1 in MPEC 2009-L19 -- 85989
I20Rio Cuarto Obs. in Argentina, 4 in MPEC 2009-L19 -- 2009 KJ22, 2009 JM2, 35396, 142781
B40Skylive Obs. in Italy, 1 in MPEC 2009-L19 -- 2002 LV
926Tenagra II Obs. in Arizona, 1 in MPEC 2009-L19 -- 2009 KL2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 June '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2205 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 HCJPL Sentry13332095-209921.2e-06-6.26-6.280JPL: "Analysis based on 148 observations spanning 44.903 days (2009-Apr-17.23164 to 2009-Jun-01.13477)." Diameter approximately 0.038 km. from mean, weighted H=24.8.

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 4 June '09

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

1435Noted that the NEOCP has become empty
1333Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Grabbed MPEC 2009-L19 - Daily Orbit Update - see above
Noted that the NEOCP has become active