Contents  on 13 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 13 June '12

Two objects reported inside ten LD

Two objects are reported moving within ten lunar distances (LD) of Earth today. 2012 LT is outbound from 5.92 to 6.99 LD and risk-listed 2012 LJ departs from inside ten LD, traveling from 9.53 to 13.72 LD.

Up next, 2012 LU arrives inside ten LD on June 16th.

This report was generated at 1541 UTC with follow-up in today's DOU MPEC for 2012 LU, 2012 LJ, and 2012 LA.

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.

NEOCP Activity  on 13 June '12

The MPC's NEO Confirmation Page has 29 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 29 objects listed. Of these, 23 were "one nighters." So far The Tracking News has counted a total of 51 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 13 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-L36 - "12:24 UT" - 2012 LG4

MPEC 2012-L35 - "12:22 UT" - 2012 LF4

<< DOU on 13 June '12 >>  MPEC 2012-L34 - "06:02 UT" - Daily Orbit Update

MPEC 2012-L33 - "01:34 UT" - 2010 GX34

MPEC 2012-L32 - "00:46 UT" - 2012 LK2

Observers  on 13 June '12

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPECs 2012-L34, 2012-L35 & 2012-L36 -- 2012 LU, 2012 LG4, 2012 LF4, 2012 LC1, 2012 LA, 2012 KF47
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2012-L34 & 2012-L35 -- 2012 LF4, 1984 QY1, 16960, 100756, 5587
821Cordoba Obs. Bosque Alegre Station in Argentina, 2 in MPECs 2012-L35 & 2012-L36 -- 2012 LG4, 2012 LF4
F659Marco Micheli in Hawaii via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-L33 -- 2010 GX34
695]Mark Trueblood via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-L35 -- 2012 LF4
809<program code "<" via La Silla in Chile, 1 in MPEC 2012-L33 -- 2010 GX34
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2012-L34 -- 2012 LD1, 2012 DH61
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-L35 -- 2012 LF4
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-L34 -- 2011 ON24
711McDonald Obs. in Texas, 1 in MPEC 2012-L32 -- 2012 LK2
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2012-L34 -- 2012 HY1, 68346, 67367, 317643
0892Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 1 in MPEC 2012-L34 -- 2012 LJ
F51Pan-STARRS 1 (PS1) in Hawaii, 11 in MPECs 2012-L32, 2012-L34 & 2012-L36 -- 2012 LK2, 2012 LJ2, 2012 LG4, 2010 XG11, 2009 ML1, 2007 MT20, 1999 LK1, 48603, 163014, 153958, 142555
H06+program code "+" (20) via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-L34 -- 141018
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-L35 -- 2012 LF4
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-L35 -- 2012 LF4
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2012-L32 & 2012-L34 -- 2012 LR1, 2012 LK2, 2012 KY3, 2012 JG11, 2012 HR2, 2011 YU74, 2009 JR5, 2008 AF4, 2007 DS84, 2000 AE6
I93St. Pardon de Conques Obs. in France, 3 in MPECs 2012-L32, 2012-L34 & 2012-L35 -- 2012 LK2, 2012 LJ2, 2012 LF4
C36Starry Wanderer Obs. in Belarus, 1 in MPEC 2012-L34 -- 2011 WV134
B18Terskol Obs. in Russia, 1 in MPEC 2012-L36 -- 2012 LG4
I76Tesla Obs., 1 in MPEC 2012-L34 -- 2012 HG31
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 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.





Notes for Today's Latest Risk Assessments
2012 LR1JPL Sentry15372034-2106159.4e-07-3.43-3.770JPL: "Analysis based on 38 observations spanning 3.7993 days (2012-Jun-09.40456 to 2012-Jun-13.20391)." Diameter approximately 0.270 km. from mean, weighted H=20.5.
NEODyS15372034-2089121.18e-06-3.38-3.50NEODyS: "Based on 38 optical observations (of which 0 are rejected as outliers) from 2012-06-09.405 to 2012-06-13.205."
2012 LJJPL Sentry15372068-207222.1e-06-5.83-5.830JPL: "Analysis based on 53 observations spanning 1.5047 days (2012-Jun-09.39822 to 2012-Jun-10.90292)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
NEODyS15372051-207224.25e-06-5.52-5.540NEODyS: "Based on 53 optical observations (of which 6 are rejected as outliers) from 2012-06-09.399 to 2012-06-10.904."

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 13 June '12

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

1541Generated Traffic Report
1537Noted that JPL Sentry has updated its 2012 LJ risk assessment - see above
Noted that NEODyS has updated its 2012 LJ risk assessment - see above
Noted that JPL Sentry has updated its 2012 LR1 risk assessment - see above
Noted that NEODyS has posted 2012 LR1 as an impact risk - see above
Grabbed MPEC 2012-L34 - Daily Orbit Update - see above
Grabbed MPEC 2012-L35 - 2012 LF4 - see above
Grabbed MPEC 2012-L36 - 2012 LG4 - see above
0223Grabbed MPEC 2012-L33 - 2010 GX34 - see above
0056Grabbed MPEC 2012-L32 - 2012 LK2 - see above