Contents  on 11 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 11 June '12

Three objects reported inside ten LD

Three visitors are reported to be within ten lunar distances (LD) of our planet today. Risk-listed 2012 LJ exits Earth's Hill sphere, moving from 1.87 to 5.41 LD. Out further, 2012 LT comes its closest to Earth on this passage, reaching 5.18 LD at 1008 UTC, and 2012 LA is outbound from 9.57 to 9.82 LD.

Coming to the neighborhood next, 2012 LU arrives inside ten LD on June 16th.

This report was generated at 1452 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. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 11 June '12

Radar observation of one object

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

Data update noted at 2120 UTC when the database was dated 11 June

NEOCP Activity  on 11 June '12

The MPC's NEO Confirmation Page has 15 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had fifteen objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 27 listings on the NEOCP today.

New MPECs  on 11 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-L27 - "20:05 UT" - Comet C/2012 L3 (LINEAR)

MPEC 2012-L26 - "19:25 UT" - 2012 LP1

MPEC 2012-L25 - "10:49 UT" - 2012 LD1

MPEC 2012-L24 - "10:47 UT" - 2012 LC1

<< DOU on 11 June '12 >>  MPEC 2012-L23 - "06:02 UT" - Daily Orbit Update

Observers  on 11 June '12

A total of 30 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2007 LE
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2012-L23, 2012-L24, 2012-L25 & 2012-L26 -- 2012 LP1, 2012 LJ, 2012 LD1, 2012 LC1, 2012 LA, 2012 KX, 2012 KU42, 2012 KM45, 2012 KK11, 2012 KF47, 2001 RC12
300Bisei Spaceguard Center in Japan, 2 in MPECs 2012-L23 & 2012-L25 -- 2012 LU, 2012 LD1
B96Brixiis Obs. in Belgium, 1 in MPEC 2012-L25 -- 2012 LD1
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2012-L23, 2012-L24 & 2012-L25 -- 2012 LD1, 2012 LC1, 2012 HG31, 2012 DH61, 2010 LJ14, 329275
448Desert Moon Obs. in New Mexico, 2 in MPEC 2012-L23 -- 53110, 248818
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPECs 2012-L24 & 2012-L25 -- 2012 LD1, 2012 LC1
I48El Catalejo Obs. in Argentina, 2 in MPECs 2012-L24 & 2012-L25 -- 2012 LD1, 2012 LC1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-L24 -- 2012 LC1
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-L27 -- C/2012 L3
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2007 LE
J95Great Shefford Obs. in England, 1 in MPEC 2012-L25 -- 2012 LD1
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-L27 -- C/2012 L3
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-L27 -- C/2012 L3
C40Kuban State Univ. Obs. in Russia, 2 in MPEC 2012-L23 -- 2007 LE, 5587
704LINEAR in New Mexico, 1 in MPEC 2012-L27 -- C/2012 L3
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2012-L23, 2012-L24 & 2012-L26 -- 2012 LP1, 2012 LC1, 2012 JB16, 85628
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPEC 2012-L23 -- 2012 KC6, 2012 CA21, 24445, 163732, 143637, 100756
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2012-L23 -- 2011 WV134, 2001 LB
H06*Rolando Ligustri in Italy via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-L27 -- C/2012 L3
H06`Erik Bryssinck in Belgium via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-L27 -- C/2012 L3
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-L24 -- 2012 LC1
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-L24 -- 2012 LC1
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-L23, 2012-L24 & 2012-L25 -- 2012 LJ, 2012 LD1, 2012 LC1
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-L23 -- 2008 MG1
510Siegen Obs. in Germany, 1 in MPEC 2012-L24 -- 2012 LC1
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2012-L23 -- 2006 VY13, 142781
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2012-L23, 2012-L24, 2012-L26 & 2012-L27 -- 2012 LP1, 2012 LC1, C/2012 L3, 2012 KU12, 2012 KL11, 2012 KK11, 2012 HD20, 2012 FN62, 2011 OP24, 2010 DM, 2007 RT146, 2004 JN2, 2002 RV112
954Teide Obs. in the Canary Islands, 1 in MPEC 2012-L25 -- 2012 LD1
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-L23 -- 4341
718Wiggins Obs. in Utah, 1 in MPEC 2012-L27 -- C/2012 L3
I15Wishing Star Obs. in Rhode Island, 6 in MPEC 2012-L23 -- 2012 KM45, 2012 HG31, 2012 DH61, 329275, 162082, 7092
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 LJJPL Sentry14502068-207221.9e-06-5.88-5.880JPL: "Analysis based on 46 observations spanning .93904 days (2012-Jun-09.39822 to 2012-Jun-10.337259)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
NEODyS14502051-207223.53e-06-5.61-5.620NEODyS: "Based on 46 optical observations (of which 3 are rejected as outliers) from 2012-06-09.399 to 2012-06-10.338."

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 11 June '12

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

2120Grabbed MPEC 2012-L27 - Comet C/2012 L3 (LINEAR) - see above
Noted Radar Astrometry database update - see above
2009Grabbed MPEC 2012-L26 - 2012 LP1 - see above
1452Generated Traffic Report
1450Noted that JPL Sentry has updated its 2012 LJ risk assessment - see above
Noted that NEODyS has updated its 2012 LJ risk assessment - see above
Grabbed MPEC 2012-L23 - Daily Orbit Update - see above
Grabbed MPEC 2012-L24 - 2012 LC1 - see above
Grabbed MPEC 2012-L25 - 2012 LD1 - see above