Contents  on 21 June '12

Asteroid/Comet Connection (A/CC) 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.

Traffic Report  on 21 June '12

Two objects reported inside ten LD

There are two asteroids reported to be within ten lunar distances (LD) of Earth today. 2012 LU is inbound from 6.51 to 6.04 LD and risk-listed 2012 MY2 from 7.4 to 6.6 LD*. No other objects are know to come inside ten LD until November.

This report was generated at 1612 UTC with follow-up in today's DOU MPEC for 2012 LU.


Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Object distances are interpreted by A/CC from JPL Horizons data. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 21 June '12

The MPC's NEO Confirmation Page has 17 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seventeen objects listed. Of these, seven were "one nighters." So far The Tracking News has counted a total of 24 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 21 June '12

Minor Planet Electronic Circulars

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


MPEC 2012-M31 - "20:27 UT" - 2012 MQ3


MPEC 2012-M30 - "20:23 UT" - 2012 MO3


MPEC 2012-M29 - "20:01 UT" - 2007 LC15


MPEC 2012-M28 - "19:04 UT" - Comet P/2003 O2 = 2012 M1 (LINEAR)


<< DOU on 21 June '12 >>  MPEC 2012-M27 - "06:02 UT" - Daily Orbit Update

Observers  on 21 June '12

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 9 in MPECs 2012-M27, 2012-M29, 2012-M30 & 2012-M31 -- 2012 MQ3, 2012 MP, 2012 MO3, 2012 LL9, 2012 LK11, 2012 LG4, 2007 LC15, 2004 XK35, 143527
160Castelmartini Obs. in Italy, 4 in MPEC 2012-M27 -- 2012 LZ1, 2012 HG31, 329275, 326732
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2012-M27 -- 330825, 1685
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 13 in MPEC 2012-M27 -- 2012 MQ, 2012 LU, 2012 LR1, 2012 LK9, 2012 LG4, 2012 LC13, 2012 KL18, 2012 JW11, 2006 BH, 2005 NE21, 2005 HA8, 2004 CR2, 1999 PJ1
I63Cygnus Obs., 1 in MPEC 2012-M27 -- 2012 LZ1
H75Indian Hill North Obs. in Ohio, 1 in MPEC 2012-M27 -- 2012 LZ1
704LINEAR in New Mexico, 5 in MPEC 2012-M27 -- 2012 LU7, 2012 LG4, 1994 NK, 326732, 153958
H01Magdalena Ridge Obs. (MRO) in New Mexico, 5 in MPECs 2012-M27, 2012-M29, 2012-M30 & 2012-M31 -- 2012 MQ3, 2012 MO3, 2012 KJ11, 2007 LC15, 101955
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2012-M27, 2012-M29, 2012-M30 & 2012-M31 -- 2012 MQ3, 2012 MO3, 2007 LC15, 2006 BZ7, 2003 MT2, 2002 EZ2
A13Naef Obs. in Switzerland, 1 in MPEC 2012-M27 -- 153958
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-M28 -- P/2012 M1
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-M31 -- 2012 MQ3
033Schwarzschild Obs. in Germany, 5 in MPEC 2012-M27 -- 2011 AU4, 2011 AG3, 2010 XG, 2010 UY6, 2002 PD130
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-M27 -- 2012 MP, 2007 RT146, 217837, 154007
291Spacewatch 1.8m telescope in Arizona, 12 in MPECs 2012-M27, 2012-M29 & 2012-M30 -- 2012 MQ, 2012 MO3, 2012 MN2, 2012 LT7, 2012 LQ7, 2012 LK2, 2012 LK11, 2012 LF11, 2012 LD13, 2012 KY41, 2012 CP2, 2007 LC15
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 June '12

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 CLOMON2 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
2012 MY2NEODyS16092036-2090154.93e-06-6.19-6.620NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2012-06-19.186 to 2012-06-20.201."
2012 MU2JPL Sentry16092015-210362.7e-05-1.47-1.480JPL: "Analysis based on 30 observations spanning 2.0296 days (2012-Jun-18.16459 to 2012-Jun-20.19422)." Diameter approximately 0.241 km. from mean, weighted H=20.7.
NEODyS16092015-208363.08e-05-1.45-1.460NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2012-06-18.165 to 2012-06-20.195."
2012 LK11JPL Sentry16092023-2107103.8e-06-2.68-2.720JPL: "Analysis based on 45 observations spanning 5.1036 days (2012-Jun-15.36399 to 2012-Jun-20.4676)." Diameter approximately 0.320 km. from mean, weighted H=20.1.
NEODyS16092023-206261.91e-06-2.96-3.00NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2012-06-15.365 to 2012-06-20.468."
2012 LK9JPL Sentry16092020-206346.7e-08-2.90-2.920JPL: "Analysis based on 41 observations spanning 7.7097 days (2012-Jun-12.35378 to 2012-Jun-20.06349)." Diameter approximately 0.984 km. from mean, weighted H=17.7.
NEODyS16092020-207171.14e-08-3.67-3.690NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2012-06-12.355 to 2012-06-20.064."
2012 LR1JPL Sentry1609208012.9e-08-5.15-5.150JPL: "Analysis based on 89 observations spanning 10.763 days (2012-Jun-09.40456 to 2012-Jun-20.16737)." Diameter approximately 0.270 km. from mean, weighted H=20.5.

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 21 June '12

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

2103Grabbed MPEC 2012-M29 - 2007 LC15 - see above
Grabbed MPEC 2012-M30 - 2012 MO3 - see above
Grabbed MPEC 2012-M31 - 2012 MQ3 - see above
1941Grabbed MPEC 2012-M28 - Comet P/2003 O2 = 2012 M1 (LINEAR) - see above
1612Generated Traffic Report
1609Noted that JPL Sentry has updated its 2012 LK11 risk assessment - see above
Noted that NEODyS has updated its 2012 LK11 risk assessment - see above
Noted that JPL Sentry has updated its 2012 LK9 risk assessment - see above
Noted that NEODyS has updated its 2012 LK9 risk assessment - see above
Noted that JPL Sentry has updated its 2012 LR1 risk assessment - see above
Noted that JPL Sentry has posted 2012 MU2 as an impact risk - see above
Noted that NEODyS has posted 2012 MU2 as an impact risk - see above
Noted that NEODyS has posted 2012 MY2 as an impact risk - see above
Grabbed MPEC 2012-M27 - Daily Orbit Update - see above