Contents  on 23 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 23 June '12

Two objects reported inside ten LD

There are two asteroids reported to be within ten lunar distances (LD) of Earth today. Risk-listed 2012 MY2 is inbound from 5.82 to 5.04 LD and 2012 LU comes its closest to Earth this time around, reaching 5.77 LD at 1006 UTC. No other objects are known to come inside ten LD until November.

This report was generated at 1542 UTC with follow-up in today's DOU MPEC for 2012 MY2, 2012 LA11, and 2012 LU, plus observation of 2010 FM from March of 2010.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. 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 23 June '12

The MPC's NEO Confirmation Page has 28 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 28 objects listed. Of these, nine were "one nighters."

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 23 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 23 June '12 >>  MPEC 2012-M37 - "06:02 UT" - Daily Orbit Update

Observers  on 23 June '12

A total of 20 observers appear in today's MPEC.

CodeObserver / observatory
C60Argelander Institute for Astronomy Obs. in Germany, 1 in MPEC 2012-M37 -- 1984 QY1
H21Astronomical Research Obs. Westfield in Illinois, 13 in MPEC 2012-M37 -- 2012 MY2, 2012 MW1, 2012 MU2, 2012 LU7, 2012 LL9, 2012 LJ11, 2012 LH11, 2012 LF4, 2012 LC1, 2012 LA11, 2012 KM18, 2004 PM2, 159699
160Castelmartini Obs. in Italy, 2 in MPEC 2012-M37 -- 2012 LZ1, 2012 HG31
703Catalina Sky Survey (CSS) in Arizona, 4 in MPEC 2012-M37 -- 329437, 317685, 173561, 138847
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 15 in MPEC 2012-M37 -- 2012 MX2, 2012 MQ, 2012 MN2, 2012 LW7, 2012 LU, 2012 LR1, 2012 LK9, 2012 LC13, 2012 KX, 2012 KL18, 2012 JW11, 2012 JM4, 2012 JB16, 2012 GX11, 2008 NS1
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-M37 -- 2012 LZ1
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 3 in MPEC 2012-M37 -- 2010 OS22, 248818, 6611
A17Guidestar Obs. in Germany, 5 in MPEC 2012-M37 -- 2012 LK11, 2012 LG11, 2012 LF11, 2012 LE11, 317685
232Masquefa Obs. in Spain, 1 in MPEC 2012-M37 -- 2011 WV134
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-M37 -- 2012 BZ34
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPEC 2012-M37 -- 276397, 189263
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2012-M37 -- 3122
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-M37 -- 2012 LA11
B38Santa Mama Obs. in Italy, 4 in MPEC 2012-M37 -- 162980, 112221, 7889, 5587
033Schwarzschild Obs. in Germany, 2 in MPEC 2012-M37 -- 2010 FM, 2010 EX11
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-M37 -- 88710, 142781, 136773, 12538
291Spacewatch 1.8m telescope in Arizona, 7 in MPEC 2012-M37 -- 2012 LK2, 2012 LF11, 2012 HR2, 2010 NJ1, 2010 HQ80, 2009 QO, 2001 SK276
926Tenagra II Obs. in Arizona, 1 in MPEC 2012-M37 -- 4341
I76Tesla Obs., 3 in MPEC 2012-M37 -- 2012 LU7, 2012 LG11, 2012 LE11
I42Westport Obs., 1 in MPEC 2012-M37 -- 2012 LZ1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 Sentry15412072-2111221.4e-05-5.91-6.420JPL: "Analysis based on 34 observations spanning 2.9973 days (2012-Jun-19.18552 to 2012-Jun-22.18284)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS15412080-208951.63e-06-6.77-7.230NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2012-06-19.186 to 2012-06-22.184."
2012 MU2JPL Sentry15412015-209849.4e-05-0.88-0.881JPL: "Analysis based on 40 observations spanning 4.0143 days (2012-Jun-18.16459 to 2012-Jun-22.17892)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
NEODyS15412015-206731.08e-04-0.81-0.811NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2012-06-18.165 to 2012-06-22.180."
2012 LK11JPL Sentry15412026-209579.1e-07-3.57-3.930JPL: "Analysis based on 48 observations spanning 7.6874 days (2012-Jun-15.36399 to 2012-Jun-23.05137)." Diameter approximately 0.311 km. from mean, weighted H=20.2.
NEODyS15412026-208591.47e-06-3.31-3.560NEODyS: "Based on 48 optical observations (of which 0 are rejected as outliers) from 2012-06-15.365 to 2012-06-23.052."
2012 LK9JPL Sentry15412047-208633.3e-09-4.70-4.950JPL: "Analysis based on 54 observations spanning 9.6489 days (2012-Jun-12.35378 to 2012-Jun-22.00266)." Diameter approximately 1.100 km. from mean, weighted H=17.5.
NEODyS1541R E M O V E D-
2012 LR1JPL Sentry1541R E M O V E DJPL: Risk listing removed at 0853 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 23 June '12

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

1542Generated Traffic Report
1541Noted that JPL Sentry has updated its 2012 LK11 risk assessment - see above
Noted that NEODyS has updated its 2012 LK11 risk assessment - see above
Noted that JPL Sentry has updated its 2012 LK9 risk assessment - see above
Noted that NEODyS has removed 2012 LK9 as an impact risk - see above
Noted that JPL Sentry has removed 2012 LR1 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 MU2 risk assessment - see above
Noted that NEODyS has updated its 2012 MU2 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-M37 - Daily Orbit Update - see above