Contents  on 10 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 10 June '12

Three objects reported inside ten LD

There are three asteroids reported inside ten lunar distances (LD) from Earth today. Within Earth's Hill sphere, newly discovered risk-listed 2012 LJ comes its closest to Earth on this passage, reaching 1.63 LD at 1843 UTC, and also its closest to the Moon -- 1.71 LD at 1846 UTC. Further out, new discovery 2012 LT is inbound from 5.80 to 5.24 LD and 2012 LA is outbound from 9.32 to 9.57 LD.

Next up, newly announced 2012 LU arrives inside ten LD on June 16th.

This report was updated at 1909 UTC with new discoveries 2012 LU (MPEC) and 2012 LT (MPEC). Earlier updates reported follow-up in today's DOU MPEC for 2012 LA and the discovery of 2012 LJ (MPEC). Earlier postings were at 0434 and 1618 UTC.

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.

NEOCP Activity  on 10 June '12

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 21 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 10 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-L22 - "16:39 UT" - 2012 LU

MPEC 2012-L21 - "16:37 UT" - 2012 LT

MPEC 2012-L20 - "16:21 UT" - 2012 HH2

<< DOU on 10 June '12 >>  MPEC 2012-L19 - "06:02 UT" - Daily Orbit Update

MPEC 2012-L18 - "00:43 UT" - 2012 LJ

Observers  on 10 June '12

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPECs 2012-L19, 2012-L21 & 2012-L22 -- 2012 LU, 2012 LT, 2012 LA, 2012 KU42, 2012 KF47, 2012 KC6, 2012 JS17, 2012 JB16, 2012 HN8, 2012 HG31
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2012-L19, 2012-L21 & 2012-L22 -- 2012 LU, 2012 LT, 2012 JB16, 297274
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-L19 -- 2004 LV3
448Desert Moon Obs. in New Mexico, 5 in MPEC 2012-L19 -- 329614, 326732, 248818, 162082, 138937
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-L19 -- 2012 HN40
J95Great Shefford Obs. in England, 2 in MPECs 2012-L18 & 2012-L22 -- 2012 LU, 2012 LJ
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-L20 -- 2012 HH2
G96Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2012-L18, 2012-L19 & 2012-L21 -- 2012 LT, 2012 LJ, 2012 DX32, 2011 US63, 2001 LB, 31345, 162173
J93Mt. Tuffley Obs. in England, 1 in MPEC 2012-L19 -- 2011 WV134
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-L19 -- 2012 GG1
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2012-L19 -- 153958, 142555
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 4 in MPEC 2012-L19 -- 2012 HG31, 2012 DH61, 2001 LB, 329437
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2012-L21 & 2012-L22 -- 2012 LU, 2012 LT
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-L22 -- 2012 LU
J84South Obs. in England, 2 in MPECs 2012-L18 & 2012-L19 -- 2012 LJ, 2001 LB
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2012-L19 -- 2009 KJ22, 329571, 277142
291Spacewatch 1.8m telescope in Arizona, 9 in MPEC 2012-L19 -- 2012 KE25, 2012 GV17, 2012 FQ1, 2012 CA55, 2011 GD68, 2010 NJ1, 2010 FQ, 2005 MD, 2004 JN2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 June '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2359 UTC, NEODyS unavailable)
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 LJNEODyS16122062-207271.3e-06-5.99-6.140NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-06-09.399 to 2012-06-09.979."
JPL Sentry04232059-2072155.0e-06-5.41-5.530JPL: "Analysis based on 24 observations spanning .58006 days (2012-Jun-09.39822 to 2012-Jun-09.97828)." Diameter approximately 0.027 km. from mean, weighted H=25.5.

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 10 June '12

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

1909Updated Traffic Report
1700Grabbed MPEC 2012-L20 - 2012 HH2 - see above
Grabbed MPEC 2012-L21 - 2012 LT - see above
Grabbed MPEC 2012-L22 - 2012 LU - see above
1612Noted that NEODyS has posted 2012 LJ as an impact risk - see above
Grabbed MPEC 2012-L19 - Daily Orbit Update - see above
0423Noted that JPL Sentry has posted 2012 LJ as an impact risk - see above
0132Grabbed MPEC 2012-L18 - 2012 LJ - see above