Contents  on 19 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 19 June '12

Two objects reported inside ten LD

There are two asteroids reported to be inside ten lunar distances (LD) of Earth today. 2012 LU is inbound from 7.99 to 7.18 LD and 2012 LA11 is outbound from 8.86 to 9.66 LD. Nothing else is known to come this close until November.

This report was generated at 1606 UTC with follow-up in today's DOU MPEC for 2012 LA11 and 2012 LT.


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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 19 June '12

Radar observation of two objects

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1914 UTC when the database was dated 19 June


Data update noted at 2200 UTC when the database was dated 19 June

NEOCP Activity  on 19 June '12

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 33 listings on the NEOCP today.

New MPECs  on 19 June '12

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-M22 - "22:26 UT" - 2012 MN2


MPEC 2012-M21 - "18:07 UT" - 2012 MW1


<< DOU on 19 June '12 >>  MPEC 2012-M20 - "06:02 UT" - Daily Orbit Update

Observers  on 19 June '12

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2012 LZ1
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2012-M20 -- 2012 LZ1, 2012 LW7, 2012 LR1, 2012 LQ7, 2012 LL9, 2012 LK11, 2012 LH11, 2012 LG4, 2012 LG11, 2012 LD1, 2012 LA11, 2009 VA26
160Castelmartini Obs. in Italy, 4 in MPEC 2012-M20 -- 2012 LU7, 329437, 326732, 153958
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-M20 & 2012-M21 -- 2012 MW1, 2012 JR17, 2011 WV134, 1994 NK, 86667, 163758, 154144
970Chelmsford Obs. in England, 1 in MPEC 2012-M20 -- 2012 LZ1
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-M22 -- 2012 MN2
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2001 CQ36
C43Hoyerswerda Obs., 1 in MPEC 2012-M20 -- 2012 LG11
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-M20 -- 2012 BU61, 2010 OB101
711McDonald Obs. in Texas, 1 in MPEC 2012-M20 -- 2012 LZ1
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-M20 & 2012-M21 -- 2012 MW1, 2012 LE11, 5836
C47Nonndorf Obs. in Austria, 3 in MPEC 2012-M20 -- 2012 LZ1, 2012 LE11, 2007 MM13
F51Pan-STARRS 1 (PS1) in Hawaii, 5 in MPECs 2012-M20 & 2012-M22 -- 2012 MN2, 2009 VO24, 2000 EA14, 52750, 137175
461SZTE Asteroid Program in Hungary, 1 in MPEC 2012-M20 -- 2012 LG11
104San Marcello Pistoiese Obs. in Italy, 3 in MPEC 2012-M20 -- 2012 LZ1, 2012 LK11, 2004 CL
033Schwarzschild Obs. in Germany, 1 in MPEC 2012-M20 -- 2008 VH
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2012-M20 -- 2012 LZ1, 2012 LT
J84South Obs. in England, 2 in MPEC 2012-M20 -- 2012 LZ1, 2012 LF4
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-M20 -- 2009 NH, 2009 KJ22, 2007 VX7, 136900
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2012-M20, 2012-M21 & 2012-M22 -- 2012 MW1, 2012 MN2, 2012 LK9, 2012 LK11, 2012 KA4, 2010 LR33, 2003 MK4
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2012-M20 -- 2012 LZ1
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2012-M20 -- 2012 LZ1
I42Westport Obs., 1 in MPEC 2012-M20 -- 2012 LZ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 June '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 LK11JPL Sentry16042023-2107172.3e-06-3.06-3.190JPL: "Analysis based on 36 observations spanning 3.6898 days (2012-Jun-15.36399 to 2012-Jun-19.05376)." Diameter approximately 0.306 km. from mean, weighted H=20.2.
NEODyS16042023-2084102.58e-06-2.96-3.060NEODyS: "Based on 36 optical observations (of which 0 are rejected as outliers) from 2012-06-15.365 to 2012-06-19.055."
2012 LK9JPL Sentry16042024-209996.1e-08-3.19-3.250JPL: "Analysis based on 34 observations spanning 5.8143 days (2012-Jun-12.35378 to 2012-Jun-18.16811)." Diameter approximately 1.042 km. from mean, weighted H=17.6.
NEODyS16042020-2083141.14e-07-2.80-3.10NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2012-06-12.355 to 2012-06-18.169."
2012 LR1JPL Sentry16042080-208629.7e-08-4.59-4.590JPL: "Analysis based on 81 observations spanning 8.7494 days (2012-Jun-09.40456 to 2012-Jun-18.15396)." Diameter approximately 0.280 km. from mean, weighted H=20.4.
NEODyS16042074-208025.78e-08-4.82-4.820NEODyS: "Based on 81 optical observations (of which 0 are rejected as outliers) from 2012-06-09.405 to 2012-06-18.155."
2012 BU61JPL Sentry1604R E M O V E DJPL: Risk listing removed at 0851 UTC.
NEODyS1604R 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 19 June '12

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

2238Grabbed MPEC 2012-M22 - 2012 MN2 - see above
2200Noted Radar Astrometry database update - see above
1914Noted Radar Astrometry database update - see above
1830Grabbed MPEC 2012-M21 - 2012 MW1 - see above
1606Generated Traffic Report
1604Noted that JPL Sentry has removed 2012 BU61 as an impact risk - see above
Noted that NEODyS has removed 2012 BU61 as an impact risk - see above
Noted 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 NEODyS has updated its 2012 LR1 risk assessment - see above
Grabbed MPEC 2012-M20 - Daily Orbit Update - see above