Contents  on 29 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 29 June '12

Two objects reported inside ten LD

There are two vistors reported to be inside ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, risk-listed radar target2012 MY2 comes its closest to Earth on this passage, reaching 1.34 LD at 2246 UTC. Out further, 2012 LU is outbound from 8.99 to 9.96 LD. No other objects are known to come within ten LD until November.

This report was generated at 1553 UTC with follow-up in today's DOU MPEC for 2012 MY2 and observation of departed 2012 LA from the 23rd, adding 8 days to its previous 14-day arc.

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 29 June '12

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed.

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 29 June '12

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 29 June '12 >>  MPEC 2012-M56 - "06:02 UT" - Daily Orbit Update

Observers  on 29 June '12

Thirteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPEC 2012-M56 -- 2012 MY2, 2012 MW1, 2012 MS4, 2012 MP, 2012 MM11, 2012 MC7, 2012 LZ1, 2012 LU7, 2012 LT7, 2012 LL9, 2012 LK9, 2012 LK2, 2012 LH11, 2012 LG11, 2012 LF11, 2012 LD1, 2012 LA, 2012 KC6, 2012 HR2, 2012 DH61
160Castelmartini Obs. in Italy, 8 in MPEC 2012-M56 -- 2012 MY2, 2012 MV4, 2012 LZ1, 2012 LE11, 2004 CL, 329437, 317685, 153958
448Desert Moon Obs. in New Mexico, 1 in MPEC 2012-M56 -- 2001 AO2
203GiaGa Obs. in Italy, 3 in MPEC 2012-M56 -- 2012 MY2, 2012 LU7, 162980
J95Great Shefford Obs. in England, 1 in MPEC 2012-M56 -- 2012 MY2
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-M56 -- 2012 BG86
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2012-M56 -- 2012 MS4, 2012 MM11, 2012 LZ1, 2012 LU7, 2012 LG11, 2012 LF11, 2011 WV134, 2007 MM13, 2004 XK35
104San Marcello Pistoiese Obs. in Italy, 6 in MPEC 2012-M56 -- 2012 MY2, 2012 MV4, 2012 MQ3, 2012 MM11, 2012 LK11, 2012 LE11
H36Sandlot Obs. in Kansas, 3 in MPEC 2012-M56 -- 2012 MZ6, 2012 MQ3, 2006 CF
B38Santa Mama Obs. in Italy, 3 in MPEC 2012-M56 -- 1984 QY1, 329437, 7889
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-M56 -- 2012 MY2
291Spacewatch 1.8m telescope in Arizona, 13 in MPEC 2012-M56 -- 2012 MR4, 2012 MN2, 2012 LU7, 2012 LK2, 2012 LK11, 2012 LJ11, 2012 LH11, 2012 LD13, 2012 FD23, 2012 ES14, 2011 UT20, 2005 YN3, 2004 JN2
718Wiggins Obs. in Utah, 2 in MPEC 2012-M56 -- 2012 MY2, 1685
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 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 Sentry1550209916.7e-08-8.28-8.280JPL: "Analysis based on 127 observations spanning 9.8104 days (2012-Jun-19.18552 to 2012-Jun-28.99588)." Diameter approximately 0.018 km. from mean, weighted H=26.3.
NEODyS1550R E M O V E D-
2012 LK11JPL Sentry1550R E M O V E DJPL: Risk listing removed at 0851 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 29 June '12

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

1553Generated Traffic Report
1550Noted that JPL Sentry has removed 2012 LK11 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 MY2 risk assessment - see above
Noted that NEODyS has removed 2012 MY2 as an impact risk - see above
Grabbed MPEC 2012-M56 - Daily Orbit Update - see above
Noted that the NEOCP has become active