Contents  on 30 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 30 June '12

Two objects reported inside ten LD

Two asteroids are reported to be within ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, risk-listed radar target2012 MY2 is outbound from 1.34 to 1.60 LD. And further away, 2012 LU departs from inside ten LD, moving from 9.96 to 10.98 LD. No other objects are known to come inside the ten-LD "bubble" until November.

This report was generated at 1614 UTC with follow-up in today's DOU MPEC for 2012 MY2.

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 30 June '12

The MPC's NEO Confirmation Page is currently empty

The NEOCP is currently empty. There was one listing noted earlier today.

New MPECs  on 30 June '12

Minor Planet Electronic Circulars

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

<< DOU on 30 June '12 >>  MPEC 2012-M57 - "06:03 UT" - Daily Orbit Update

Observers  on 30 June '12

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2012-M57 -- 2012 MZ6, 2012 MY2, 2012 MV4, 2012 MU2, 2012 MS4, 2012 MQ3, 2012 MP, 2012 MM11, 2012 ML6, 2012 MK6, 2012 MG7, 2012 MC7, 2012 LT7, 2012 LL9, 2012 LK11, 2012 LG11, 2012 LF11
A81Balzaretto Obs. in Italy, 1 in MPEC 2012-M57 -- 153958
160Castelmartini Obs. in Italy, 2 in MPEC 2012-M57 -- 2012 LU7, 2012 HG31
585Kiev Comet Station in the Ukraine, 1 in MPEC 2012-M57 -- 1685
704LINEAR in New Mexico, 2 in MPEC 2012-M57 -- 2012 BC20, 162980
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPEC 2012-M57 -- 2012 MY2, 2012 MU2, 2012 KY3
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 10 in MPEC 2012-M57 -- 2012 MS4, 2012 MM11, 2012 LZ1, 2012 LU7, 2012 LG11, 2012 HG31, 2011 WV134, 2007 MM13, 329437, 153958
H36Sandlot Obs. in Kansas, 5 in MPEC 2012-M57 -- 2012 ML6, 2012 KU42, 2012 JR17, 2006 CF, 1999 TN12
204Schiaparelli Obs. in Italy, 1 in MPEC 2012-M57 -- 2012 MY2
G68Sierra Stars Obs. in northern California, 1 in MPEC 2012-M57 -- 2012 MM11
291Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2012-M57 -- 2012 MN2, 2012 ME7, 2012 MA7, 2012 LT7, 2012 LF11, 2012 HN8, 2011 UT20, 2010 OS22
718Wiggins Obs. in Utah, 1 in MPEC 2012-M57 -- 1685
I15Wishing Star Obs. in Rhode Island, 1 in MPEC 2012-M57 -- 329437
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 June '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2359 and NEODyS at 2024 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 MA7JPL Sentry1609207116.6e-10-6.96-6.960JPL: "Analysis based on 27 observations spanning 8.0048 days (2012-Jun-22.16999 to 2012-Jun-30.17481)." Diameter approximately 0.260 km. from mean, weighted H=20.5.

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 30 June '12

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

1614Generated Traffic Report
1609Noted that JPL Sentry has updated its 2012 MA7 risk assessment - see above
Grabbed MPEC 2012-M57 - Daily Orbit Update - see above
Noted that the NEOCP has become empty