Contents  on 28 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 28 June '12

Two objects reported inside ten LD

Two asteroids are reported flying within ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, risk-listed radar target 2012 MY2 comes its closest to the Moon this time around, reaching 1.22 LD at 1709 UTC. Further away, 2012 LU is outbound from 8.09 to 8.99 LD. No other objects are known to come within ten LD until November.

This report was generated at 1532 UTC with the recovery of departed intruder 2012 MF7 and follow-up for 2012 MY2 and 2012 LU in today's DOU MPEC.

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 28 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 28 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 28 June '12 >>  MPEC 2012-M55 - "06:02 UT" - Daily Orbit Update

Observers  on 28 June '12

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPEC 2012-M55 -- 2012 MZ6, 2012 MY2, 2012 MV4, 2012 MU2, 2012 MS4, 2012 MP, 2012 MM11, 2012 MG7, 2012 MC7, 2012 LT7, 2012 LL9, 2012 LH11, 2012 LG11, 2012 LF11, 2012 HO15, 2012 HG31, 244977, 141527
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 15 in MPEC 2012-M55 -- 2012 MZ6, 2012 MX2, 2012 MN2, 2012 MK6, 2012 MJ6, 2012 MG7, 2012 MF7, 2012 MB7, 2012 LW7, 2012 LU, 2012 KX, 2012 KL18, 2012 JW11, 2012 GX11, 2011 VS5
448Desert Moon Obs. in New Mexico, 2 in MPEC 2012-M55 -- 297274, 138937
704LINEAR in New Mexico, 3 in MPEC 2012-M55 -- 2007 MT20, 1984 QY1, 163758
130Lumezzane Obs. in Italy, 2 in MPEC 2012-M55 -- 2012 LZ1, 1221
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2012-M55 -- 2012 LZ1, 2012 LE11
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 12 in MPEC 2012-M55 -- 2012 MS4, 2012 MP, 2012 MM11, 2012 LZ1, 2012 LU7, 2012 LG11, 2012 LF11, 2012 HG31, 2012 DU30, 2011 WV134, 2007 MT20, 2007 MM13
204Schiaparelli Obs. in Italy, 6 in MPEC 2012-M55 -- 2012 MY2, 2012 MU2, 2012 MC7, 2010 NJ1, 2005 YN3, 2000 EA14
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2012-M55 -- 2012 MR4, 2012 LD13, 2012 KC6, 2012 JH11
718Wiggins Obs. in Utah, 2 in MPEC 2012-M55 -- 2012 LG11, 1685
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 28 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 MF7JPL Sentry15302046-2092111.5e-04-4.63-4.680JPL: "Analysis based on 23 observations spanning 3.7791 days (2012-Jun-23.37429 to 2012-Jun-27.15344)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
NEODyS15302046-2086181.83e-04-4.54-4.590NEODyS: "Based on 24 optical observations (of which 1 are rejected as outliers) from 2012-06-23.375 to 2012-06-27.154."
2012 MY2JPL Sentry15302085-210766.4e-06-6.28-6.460JPL: "Analysis based on 100 observations spanning 8.0182 days (2012-Jun-19.18552 to 2012-Jun-27.20373)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS15302085-208511.3e-07-7.89-7.890NEODyS: "Based on 101 optical observations (of which 1 are rejected as outliers) from 2012-06-19.186 to 2012-06-27.204."
2008 CK70NEODyS15302030-203123.62e-04-3.07-3.070NEODyS: "Based on 77 optical observations (of which 0 are rejected as outliers) from 2008-02-09.342 to 2008-02-14.007."

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 28 June '12

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

1532Generated Traffic Report
1530Noted that NEODyS has updated its 2008 CK70 risk assessment - see above
Noted that JPL Sentry has updated its 2012 MF7 risk assessment - see above
Noted that NEODyS has updated its 2012 MF7 risk assessment - see above
Noted that JPL Sentry has updated its 2012 MY2 risk assessment - see above
Noted that NEODyS has updated its 2012 MY2 risk assessment - see above
Grabbed MPEC 2012-M55 - Daily Orbit Update - see above
Noted that the NEOCP has become empty