Contents  on 31 May '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 31 May '11

The MPC's NEO Confirmation Page has 70 listings

When last checked at 2318 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 70 objects listed. Of these, 49 were "one nighters." So far The Tracking News has counted a total of 102 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 31 May '11

Minor Planet Electronic Circulars

As of last check at 2318 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2011-K56 - "20:37 UT" - Comet P/2011 JB15 (Spacewatch-Boattini)


MPEC 2011-K55 - "19:32 UT" - 2010 KZ39


MPEC 2011-K54 - "12:35 UT" - 2009 SK1


<< DOU on 31 May '11 >>  MPEC 2011-K53 - "07:07 UT" - Daily Orbit Update


MPEC 2011-K52 - "02:48 UT" - 2011 KP16


MPEC 2011-K51 - "02:14 UT" - 2011 JP29

Observers  on 31 May '11

A total of 29 observers appear in today's MPECs.

CodeObserver / observatory
H17Angel Peaks Obs. in Colorado, 1 in MPEC 2011-K53 -- 2011 HP
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2011-K51, 2011-K53, 2011-K54 & 2011-K56 -- 2011 KN9, 2011 KL12, 2011 KK15, 2011 KF9, 2011 KE, 2011 JR13, 2011 JP29, P/2011 JB15, 2011 HT, 2011 HL7, 2009 SK1
A81Balzaretto Obs. in Italy, 1 in MPEC 2011-K56 -- P/2011 JB15
235CAST Obs. in Italy, 1 in MPEC 2011-K56 -- P/2011 JB15
470Ceccano Obs. in Italy, 1 in MPEC 2011-K56 -- P/2011 JB15
C13Como Obs. in Italy, 1 in MPEC 2011-K53 -- 2006 OY10
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 2 in MPECs 2011-K52 & 2011-K56 -- 2011 KP16, P/2011 JB15
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2011-K56 -- P/2011 JB15
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-K51 -- 2011 JP29
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2011-K54 -- 2009 SK1
J95Great Shefford Obs. in England, 6 in MPECs 2011-K52, 2011-K53, 2011-K54 & 2011-K56 -- 2011 KY15, 2011 KP16, 2011 KE15, 2011 KE, P/2011 JB15, 2009 SK1
A17Guidestar Obs. in Germany, 1 in MPEC 2011-K53 -- 2011 KN9
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2011-K53 -- 2001 QP181, 1866
682Kanab Obs. in Utah, 1 in MPEC 2011-K56 -- P/2011 JB15
704LINEAR in New Mexico, 7 in MPECs 2011-K51 & 2011-K53 -- 2011 KN9, 2011 JP29, 2011 GQ65, 2008 TR10, 169675, 163335, 7358
304Las Campanas Obs. in Chile, 1 in MPEC 2011-K55 -- 2010 KZ39
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2011-K52 & 2011-K56 -- 2011 KP16, P/2011 JB15
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2011-K53 -- 2011 KN9, 2008 JV19
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2011-K52 & 2011-K56 -- 2011 KP16, P/2011 JB15
A24New Millennium Obs. in Italy, 7 in MPECs 2011-K51 & 2011-K53 -- 2011 JP29, 2011 HP, 267494, 188174, 137170, 7482, 1866
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2011-K53 -- 2004 MO7, 136635, 5011
H06%Ernesto Guido in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-K56 -- P/2011 JB15
H066Andrew Lowe in Alberta via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-K51 -- 2011 JP29
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2011-K56 -- P/2011 JB15
104San Marcello Pistoiese Obs. in Italy, 3 in MPECs 2011-K52, 2011-K53 & 2011-K56 -- 2011 KP16, 2011 KJ15, P/2011 JB15
B38Santa Mama Obs. in Italy, 3 in MPEC 2011-K53 -- 2011 KE, 2011 JR13, 4954
204Schiaparelli Obs. in Italy, 4 in MPECs 2011-K51, 2011-K52, 2011-K54 & 2011-K56 -- 2011 KP16, 2011 JP29, P/2011 JB15, 2009 SK1
510Siegen Obs. in Germany, 1 in MPEC 2011-K51 -- 2011 JP29
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2011-K51 & 2011-K56 -- 2011 JP29, P/2011 JB15
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2011-K53 -- 2011 JK, 2011 HO4, 2011 GD60, 2011 GA
926Tenagra II Obs. in Arizona, 1 in MPEC 2011-K53 -- 2008 TR10
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2011-K56 -- P/2011 JB15
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 May '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2318 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 KE15JPL Sentry16252020-204963.1e-05-4.82-4.870JPL: "Analysis based on 14 observations spanning 4.7702 days (2011-May-26.26154 to 2011-May-31.03172)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
NEODyS16252020-2080104.14e-05-4.70-4.760NEODyS: "Based on 14 optical observations (of which 0 are rejected as outliers) from 2011-05-26.262 to 2011-05-31.032."

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 31 May '11

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

2101Grabbed MPEC 2011-K56 - Comet P/2011 JB15 (Spacewatch-Boattini) - see above
2000Grabbed MPEC 2011-K55 - 2010 KZ39 - see above
1625Noted that JPL Sentry has updated its 2011 KE15 risk assessment - see above
Noted that NEODyS has updated its 2011 KE15 risk assessment - see above
Grabbed MPEC 2011-K53 - Daily Orbit Update - see above
Grabbed MPEC 2011-K54 - 2009 SK1 - see above
0326Grabbed MPEC 2011-K52 - 2011 KP16 - see above
0230Grabbed MPEC 2011-K51 - 2011 JP29 - see above