Contents  on 5 June '11

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 5 June '11

The MPC's NEO Confirmation Page has 70 listings

When last checked at 2307 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 70 objects listed. Of these, 32 were "one nighters." So far The Tracking News has counted a total of 94 listings on the NEOCP 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 5 June '11

Minor Planet Electronic Circulars

As of last check at 2307 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-L21 - "22:18 UT" - 2011 LJ1


MPEC 2011-L20 - "17:46 UT" - 2008 VH


MPEC 2011-L19 - "10:26 UT" - 2011 LD1


<< DOU on 5 June '11 >>  MPEC 2011-L18 - "07:08 UT" - Daily Orbit Update

Observers  on 5 June '11

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2011-L18 -- 162474
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2011-L18, 2011-L19 & 2011-L20 -- 2011 LD1, 2011 KU15, 2011 KP16, 2011 KN9, 2011 JR13, 2011 HP, 2011 HL7, 2008 VH, 2005 UT64
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2011-L18, 2011-L19 & 2011-L21 -- 2011 LJ1, 2011 LD1, 2011 KP17, 2004 LH, 37336, 264308, 163335, 162474, 138359
807,Ovidiu Vaduvescu via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2011-L18 -- 2011 AG5, 2010 KX7, 2004 AE, 2003 VE1
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2011-L18 -- 2011 KW15, 2011 KO17, 2011 KN17, 2011 JU10
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2011-L18 -- 2011 HP
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2011-L19 -- 2011 LD1
J95Great Shefford Obs. in England, 2 in MPECs 2011-L19 & 2011-L20 -- 2011 LD1, 2008 VH
704LINEAR in New Mexico, 2 in MPECs 2011-L18 & 2011-L20 -- 2008 VH, 1917
J87La Canada Obs. in Spain, 1 in MPEC 2011-L19 -- 2011 LD1
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2011-L18 -- 2011 HL7
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2011-L18, 2011-L19 & 2011-L21 -- 2011 LJ1, 2011 LD1, 53789, 256412
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2011-L21 -- 2011 LJ1
510Siegen Obs. in Germany, 1 in MPEC 2011-L19 -- 2011 LD1
691Spacewatch 0.9m telescope in Arizona, 3 in MPECs 2011-L18 & 2011-L21 -- 2011 LJ1, 2011 HO53, 162474
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2011-L21 -- 2011 LJ1
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2011-L19, 2011-L20 & 2011-L21 -- 2011 LJ1, 2011 LD1, 2008 VH
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-L20 -- 2008 VH
D96Tzec Maun Obs. Moorook in South Australia, 1 in MPEC 2011-L18 -- 2009 BD
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2011-L18 -- 2008 HE
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 5 June '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2307 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. Both also post impact solutions beyond 100 years for a few special 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
2011 KN17JPL Sentry1530207114.4e-07-5.10-5.100JPL: "Analysis based on 67 observations spanning 4.9370 days (2011-May-30.27802 to 2011-Jun-04.21498)." Diameter approximately 0.100 km. from mean, weighted H=22.6.
NEODyS15302071-207114.6e-07-5.07-5.070NEODyS: "Based on 67 optical observations (of which 0 are rejected as outliers) from 2011-05-30.279 to 2011-06-04.216."
2011 AG5JPL Sentry20272040-204755.9e-04-1.55-1.551JPL: "Analysis based on 135 observations spanning 147.13 days (2011-Jan-08.2673 to 2011-Jun-04.39362)." Diameter approximately 0.140 km. from mean, weighted H=21.8.
NEODyS15302040-204755.75e-04-1.57-1.571NEODyS: "Based on 135 optical observations (of which 0 are rejected as outliers) from 2011-01-08.268 to 2011-06-04.394."

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 5 June '11

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

2307Grabbed MPEC 2011-L21 - 2011 LJ1 - see above
2027Noted that JPL Sentry has updated its 2011 AG5 risk assessment - see above
1900Grabbed MPEC 2011-L20 - 2008 VH - see above
1530Noted that NEODyS has updated its 2011 AG5 risk assessment - see above
Noted that JPL Sentry has updated its 2011 KN17 risk assessment - see above
Noted that NEODyS has updated its 2011 KN17 risk assessment - see above
Grabbed MPEC 2011-L18 - Daily Orbit Update - see above
Grabbed MPEC 2011-L19 - 2011 LD1 - see above