Contents  on 27 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 27 June '12

Two objects reported inside ten LD

There are two objects reported passing inside ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, 2012 MY2, a risk-listed radar target, is inbound from 2.77 to 2.09 LD. Further away, 2012 LU is outbound from 7.28 to 8.09 LD. No other objects are known to come inside ten LD until November.

This report was generated at 1610 UTC with follow-up in today's DOU MPEC for 2012 MY2 and departed 2012 LA11.

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 27 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."

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 27 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 27 June '12 >>  MPEC 2012-M54 - "06:02 UT" - Daily Orbit Update

Observers  on 27 June '12

Fifteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPEC 2012-M54 -- 2012 MZ6, 2012 MY2, 2012 MW1, 2012 MU2, 2012 MS4, 2012 ML6, 2012 MG7, 2012 MC7, 2012 MB7, 2012 LU7, 2012 LK9, 2012 LG11, 2012 LF11, 2012 KL11, 2012 HG31, 2012 CA55
448Desert Moon Obs. in New Mexico, 1 in MPEC 2012-M54 -- 2012 LF11
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-M54 -- 4179
704LINEAR in New Mexico, 3 in MPEC 2012-M54 -- 2012 LE11, 2007 MT20, 4947
637MPC code 637, 1 in MPEC 2012-M54 -- 433
C95MPC code C95, 1 in MPEC 2012-M54 -- 433
711McDonald Obs. in Texas, 1 in MPEC 2012-M54 -- 2012 MY2
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2012-M54 -- 2012 LZ1, 153958
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2012-M54 -- 2012 MS4, 2012 LZ1, 2012 LU7, 2012 LG11, 2012 LF11, 2011 WV134, 2007 MM13, 2004 XK35
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-M54 -- 2012 DG61
B38Santa Mama Obs. in Italy, 4 in MPEC 2012-M54 -- 2012 HG31, 1984 QY1, 162980, 5587
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-M54 -- 2012 MY2
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2012-M54 -- 2012 LU7, 2012 LK11, 2012 LF11, 2012 LA11, 2012 KF47, 2012 KC6, 2011 YH28
H47Vicksburg Obs. in Mississippi, 2 in MPEC 2012-M54 -- 2012 LZ1, 1994 NK
718Wiggins Obs. in Utah, 3 in MPEC 2012-M54 -- 2012 MY2, 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 27 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 MY2JPL Sentry16082085-210565.5e-06-6.35-6.520JPL: "Analysis based on 91 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.
NEODyS16082089-208911.31e-08-8.91-8.910NEODyS: "Based on 92 optical observations (of which 1 are rejected as outliers) from 2012-06-19.186 to 2012-06-27.204."
2012 LK11JPL Sentry16082026-205828.9e-10-6.55-6.690JPL: "Analysis based on 57 observations spanning 11.040 days (2012-Jun-15.36399 to 2012-Jun-26.40438)." Diameter approximately 0.290 km. from mean, weighted H=20.3.

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 27 June '12

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

1610Generated Traffic Report
1608Noted that JPL Sentry has updated its 2012 LK11 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-M54 - Daily Orbit Update - see above