Contents  on 3 June '11


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 3 June '11

The MPC's NEO Confirmation Page has 90 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 90 objects listed. Of these, 61 were "one nighters." So far The Tracking News has counted a total of 105 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 3 June '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-L14 - "11:04 UT" - 2011 KJ20

<< DOU on 3 June '11 >>  MPEC 2011-L13 - "07:08 UT" - Daily Orbit Update

MPEC 2011-L12 - "01:41 UT" - 2011 KG20

Observers  on 3 June '11

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 8 in MPEC 2011-L13 -- 2011 KY15, 2011 KP16, 2011 KN17, 2011 KL12, 2011 KJ15, 2011 KH4, 2011 KF9, 2011 HC36
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2011-L13 -- 2011 KR12, 2011 KO17, 2011 KN17, 2011 KC15, 2011 JU2
J95Great Shefford Obs. in England, 3 in MPECs 2011-L12 & 2011-L13 -- 2011 KN17, 2011 KG20, 2011 KE15
168Kourovskaya Obs. in Russia, 9 in MPEC 2011-L13 -- 2010 TU5, 2001 QP181, 274138, 188174, 164121, 141432, 137170, 8176, 1866
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2011-L12 -- 2011 KG20
474Mt. John Obs. in New Zealand, 3 in MPEC 2011-L13 -- 2011 KX15, 2011 KW15, 2011 KP16
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2011-L12, 2011-L13 & 2011-L14 -- 2011 KJ20, 2011 KG20, 2004 MO7
J93Mt. Tuffley Obs. in England, 4 in MPEC 2011-L13 -- 267494, 3988, 1866, 1036
A24New Millennium Obs. in Italy, 1 in MPEC 2011-L13 -- 188174
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2011-L13 -- 2011 HQ, 2008 JV19, 2006 KR1, 86878
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-L13 -- 2011 KY15
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2011-L13 -- 2011 KQ19, 2009 BD
E03`Kevin Hills in England via RAS Obs. Victoria in Victoria, 1 in MPEC 2011-L13 -- 2011 GA55
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-L12 -- 2011 KG20
H36Sandlot Obs. in Kansas, 1 in MPEC 2011-L12 -- 2011 KG20
204Schiaparelli Obs. in Italy, 13 in MPEC 2011-L13 -- 2011 KL12, 2011 KH4, 2011 KG4, 2011 KF9, 2011 KF4, 2011 KE, 2011 KC15, 2011 JA8, 2008 TR10, 2008 HE, 2008 AS28, 2006 UQ217, 2004 KK17
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2011-L13 -- 2009 BD, 2001 UE5
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2011-L13 & 2011-L14 -- 2011 KN17, 2011 KJ20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 June '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 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.





Notes for Today's Latest Risk Assessments
2011 KN17JPL Sentry1512207117.3e-07-4.86-4.860JPL: "Analysis based on 58 observations spanning 3.9707 days (2011-May-30.27802 to 2011-Jun-03.24869)." Diameter approximately 0.110 km. from mean, weighted H=22.5.
NEODyS15122071-207117.6e-07-4.85-4.850NEODyS: "Based on 58 optical observations (of which 0 are rejected as outliers) from 2011-05-30.279 to 2011-06-03.249."
2011 KE15JPL Sentry15122020-204956.9e-05-4.47-4.470JPL: "Analysis based on 21 observations spanning 7.7976 days (2011-May-26.26154 to 2011-Jun-03.059102)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS15122020-204957.22e-05-4.44-4.440NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2011-05-26.262 to 2011-06-03.060."
2009 BDJPL Sentry1512R E M O V E DJPL: Risk listing removed at 1110 UTC.
NEODyS1512R 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 3 June '11

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

1512Noted that JPL Sentry has removed 2009 BD as an impact risk - see above
Noted that NEODyS has removed 2009 BD as an impact risk - see above
Noted that JPL Sentry has updated its 2011 KE15 risk assessment - see above
Noted that NEODyS has updated its 2011 KE15 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-L13 - Daily Orbit Update - see above
Grabbed MPEC 2011-L14 - 2011 KJ20 - see above
0227Grabbed MPEC 2011-L12 - 2011 KG20 - see above