Contents  on 26 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 26 June '12

Three objects reported inside ten LD

Three asteroids are reported within ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, risk-listed radar target 2012 MY2 is inbound from 3.50 to 2.77 LD. And, out further, 2012 LU is outbound from 6.60 to 7.28 LD and risk-listed intruder 2012 MF7 leaves the ten-LD "bubble," moving from 9.60 to 11.56 LD.

No other objects are know to come within ten LD until November.

This report was generated at 1431 UTC with follow-up in today's DOU MPEC for 2012 MY2, departed 2012 LA11, and 2012 LU.

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 26 June '12

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter." So far The Tracking News has counted a total of six 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 26 June '12

Minor Planet Electronic Circulars

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

MPEC 2012-M53 - "18:10 UT" - 2012 MM11

MPEC 2012-M52 - "13:04 UT" - 2012 MR7

<< DOU on 26 June '12 >>  MPEC 2012-M51 - "06:02 UT" - Daily Orbit Update

Observers  on 26 June '12

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 5 in MPECs 2012-M51, 2012-M52 & 2012-M53 -- 2012 MW1, 2012 MU2, 2012 MR7, 2012 MM11, 2012 LA11
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2012-M51 -- 2012 MU2, 2012 MQ, 2012 MN2, 2012 MK6, 2012 LU, 2012 LQ7, 2012 LK9, 2012 LJ2, 2012 HL8, 2012 FA14
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2012-M53 -- 2012 MM11
I48El Catalejo Obs. in Argentina, 1 in MPEC 2012-M53 -- 2012 MM11
157Frasso Sabino Obs. in Italy, 4 in MPEC 2012-M51 -- 2012 LG11, 2012 LF11, 2012 LE11, 2012 BC20
J95Great Shefford Obs. in England, 1 in MPEC 2012-M53 -- 2012 MM11
704LINEAR in New Mexico, 5 in MPECs 2012-M51 & 2012-M53 -- 2012 MM11, 2012 HG31, 85275, 317685, 20460
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-M51 -- 2012 BT61
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-M52 -- 2012 MR7
I89Nerpio Obs. in Italy, 1 in MPEC 2012-M53 -- 2012 MM11
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 11 in MPEC 2012-M51 -- 2012 MS4, 2012 LZ1, 2012 LU7, 2012 LG11, 2012 LF11, 2012 HG31, 2011 WV134, 2007 MT20, 2007 MM13, 2004 XK35, 329437
104San Marcello Pistoiese Obs. in Italy, 2 in MPEC 2012-M51 -- 2012 MY2, 2012 MU2
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-M52 & 2012-M53 -- 2012 MR7, 2012 MM11
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2012-M51 -- 2012 LU, 1994 NK
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2012-M51 & 2012-M52 -- 2012 MY2, 2012 MR7, 2012 MO3, 2012 LR1, 2012 LK2, 2012 LG4, 2012 LD13, 2012 KF47, 2009 DF1
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2012-M51 & 2012-M53 -- 2012 MY2, 2012 MM11
718Wiggins Obs. in Utah, 1 in MPEC 2012-M51 -- 2012 MY2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 26 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 MF7NEODyS14282042-2084161.92e-04-4.54-4.580NEODyS: "Based on 20 optical observations (of which 1 are rejected as outliers) from 2012-06-23.375 to 2012-06-25.217."
2012 MY2JPL Sentry14282072-2111171.2e-05-5.98-6.570JPL: "Analysis based on 66 observations spanning 7.0204 days (2012-Jun-19.18552 to 2012-Jun-26.20592)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS14282087-208715.19e-10-10.29-10.290NEODyS: "Based on 67 optical observations (of which 1 are rejected as outliers) from 2012-06-19.186 to 2012-06-26.213."
2012 MU2NEODyS1428R E M O V E D-
2012 LK9JPL Sentry1428R E M O V E DJPL: Risk listing removed at 0850 UTC.

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 26 June '12

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

2015Grabbed MPEC 2012-M53 - 2012 MM11 - see above
1431Generated Traffic Report
1428Noted that JPL Sentry has removed 2012 LK9 as an impact risk - see above
Noted that NEODyS has posted 2012 MF7 as an impact risk - see above
Noted that NEODyS has removed 2012 MU2 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 MY2 risk assessment - see above
Noted that NEODyS has reposted 2012 MY2 as an impact risk - see above
Grabbed MPEC 2012-M51 - Daily Orbit Update - see above
Grabbed MPEC 2012-M52 - 2012 MR7 - see above