Contents  on 12 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 12 June '12

Three objects reported inside ten LD

There are three asteroids reported passing within ten lunar distances (LD) of our planet today. 2012 LT is outbound from 5.29 to 5.93 LD and risk-listed 2012 LJ from 5.41 to 9.53 LD, and 2012 LA leaves ten LD, traveling from 9.82 to 10.08 LD.

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

This report was generated at 1423 UTC with follow-up in today's DOU MPEC for 2012 LU 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.

NEOCP Activity  on 12 June '12

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 31 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 12 June '12

Minor Planet Electronic Circulars

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

MPEC 2012-L31 - "22:10 UT" - 2012 LJ2

MPEC 2012-L30 - "09:30 UT" - 2012 LZ1

MPEC 2012-L29 - "09:28 UT" - 2012 LR1

<< DOU on 12 June '12 >>  MPEC 2012-L28 - "06:02 UT" - Daily Orbit Update

Observers  on 12 June '12

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2012-L28 & 2012-L29 -- 2012 LU, 2012 LR1, 2012 JU11, 2012 JR17, 2012 HS15
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2012-L28 & 2012-L31 -- 2012 LJ2, 2012 KM45
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-L30 -- 2012 LZ1
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-L28 -- 2012 LC1
I48El Catalejo Obs. in Argentina, 2 in MPECs 2012-L29 & 2012-L30 -- 2012 LZ1, 2012 LR1
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-L29 -- 2012 LR1
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-L28 & 2012-L31 -- 2012 LJ2, 297274, 5836
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2012-L28, 2012-L29 & 2012-L31 -- 2012 LR1, 2012 LJ2, 2012 KX, 2005 FD, 2004 JG6, 2000 EA14, 52750, 330233, 281375, 23183, 173561, 159454, 6050, 1980
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-L29 -- 2012 LR1
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-L31 -- 2012 LJ2
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2012-L28 & 2012-L30 -- 2012 LZ1, 2012 LT, 2008 MG1
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2012-L28, 2012-L29 & 2012-L31 -- 2012 LR1, 2012 LJ2, 2012 KY41, 2012 KN11, 2012 KJ11, 2006 WU, 2000 AE6
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-L28 -- 67367
B18Terskol Obs. in Russia, 1 in MPEC 2012-L29 -- 2012 LR1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 Sentry14222031-2109321.9e-06-3.12-3.540JPL: "Analysis based on 35 observations spanning 2.9236 days (2012-Jun-09.40456 to 2012-Jun-12.32813)." Diameter approximately 0.280 km. from mean, weighted H=20.4.

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 12 June '12

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

2300Grabbed MPEC 2012-L31 - 2012 LJ2 - see above
1423Generated Traffic Report
1422Noted that JPL Sentry has posted 2012 LR1 as an impact risk - see above
Grabbed MPEC 2012-L28 - Daily Orbit Update - see above
Grabbed MPEC 2012-L29 - 2012 LR1 - see above
Grabbed MPEC 2012-L30 - 2012 LZ1 - see above