Contents  on 25 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 25 June '12

Three objects reported inside ten LD

There are three visitors reported inside ten lunar distances (LD) of Earth today. Risk-listed 2012 MY2 enters Earth's Hill sphere, traveling from 4.26 to 3.50 LD, and 2012 LU is outbound from 6.10 to 6.60 LD. Newly announced and risk-listed intruder 2012 MF7 heads outward from 7.65 to 9.60 LD after passing Earth at 0.82 LD two days before its June 23rd discovery. No other objects are known to come within ten LD of our planet until November.

This report was generated at 1658 UTC with newly discovered 2012 MF7 (MPEC) and follow-up in today's DOU MPEC for 2012 MY2, departed 2012 LA11, and 2012 LU.


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.

Radar Astrometry  on 25 June '12

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1900 UTC when the database was dated 25 June

NEOCP Activity  on 25 June '12

The MPC's NEO Confirmation Page has 3 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of seventeen listings on the NEOCP today.

New MPECs  on 25 June '12

Minor Planet Electronic Circulars

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


MPEC 2012-M50 - "10:22 UT" - 2012 MG7


MPEC 2012-M49 - "10:20 UT" - 2012 MF7


MPEC 2012-M48 - "10:18 UT" - 2012 ME7


MPEC 2012-M47 - "10:16 UT" - 2012 MD7


MPEC 2012-M46 - "10:14 UT" - 2012 MC7


MPEC 2012-M45 - "10:11 UT" - 2012 MB7


MPEC 2012-M44 - "10:09 UT" - 2012 MA7


MPEC 2012-M43 - "10:07 UT" - 2012 MZ6


<< DOU on 25 June '12 >>  MPEC 2012-M42 - "06:02 UT" - Daily Orbit Update

Observers  on 25 June '12

A total of 31 observers appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2012-M45 -- 2012 MB7
251Arecibo in Puerto Rico, 1 in radar -- 2012 MU2
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2012-M43, 2012-M45 & 2012-M46 -- 2012 MZ6, 2012 MC7, 2012 MB7
C93Bellavista Obs. in Italy, 1 in MPEC 2012-M46 -- 2012 MC7
160Castelmartini Obs. in Italy, 1 in MPEC 2012-M46 -- 2012 MC7
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2012-M43, 2012-M46, 2012-M47 & 2012-M49 -- 2012 MZ6, 2012 MF7, 2012 MD7, 2012 MC7
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2012-M42, 2012-M43, 2012-M45, 2012-M47, 2012-M49 & 2012-M50 -- 2012 MZ6, 2012 MV4, 2012 MQ3, 2012 MP, 2012 ML6, 2012 MJ6, 2012 MG7, 2012 MF7, 2012 MD7, 2012 MB7, 2012 LU, 2012 LK11, 2012 LC1, 2012 KK18
176Consell Obs. in Spain, 1 in MPEC 2012-M46 -- 2012 MC7
448Desert Moon Obs. in New Mexico, 1 in MPEC 2012-M42 -- 2012 LD1
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-M46 -- 2012 MC7
157Frasso Sabino Obs. in Italy, 2 in MPEC 2012-M42 -- 2012 MS4, 2012 ML6
J95Great Shefford Obs. in England, 2 in MPECs 2012-M45 & 2012-M46 -- 2012 MC7, 2012 MB7
704LINEAR in New Mexico, 4 in MPEC 2012-M42 -- 1994 NK, 329614, 276397, 141018
J87La Canada Obs. in Spain, 1 in MPEC 2012-M45 -- 2012 MB7
711McDonald Obs. in Texas, 1 in MPEC 2012-M45 -- 2012 MB7
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2012-M43, 2012-M44, 2012-M45, 2012-M48, 2012-M49 & 2012-M50 -- 2012 MZ6, 2012 MG7, 2012 MF7, 2012 ME7, 2012 MB7, 2012 MA7
I89Nerpio Obs. in Italy, 3 in MPECs 2012-M42, 2012-M46 & 2012-M47 -- 2012 MD7, 2012 MC7, 2007 LC15
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2012-M42 -- 154007
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 9 in MPEC 2012-M42 -- 2012 MS4, 2012 LZ1, 2012 LU7, 2012 LG11, 2012 LF11, 2011 WV134, 2007 MT20, 2007 MM13, 2004 XK35
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-M45 -- 2012 MB7
J41Raheny Obs. in Ireland, 1 in MPEC 2012-M42 -- 2012 LZ1
H36Sandlot Obs. in Kansas, 5 in MPECs 2012-M43, 2012-M44, 2012-M45, 2012-M46 & 2012-M50 -- 2012 MZ6, 2012 MG7, 2012 MC7, 2012 MB7, 2012 MA7
204Schiaparelli Obs. in Italy, 9 in MPECs 2012-M42 & 2012-M45 -- 2012 MB7, 2012 LZ1, 2012 LU7, 2012 LG4, 2012 LG11, 2012 LF11, 2012 LE11, 2012 LA11, 2012 KF47
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-M50 -- 2012 MG7
J84South Obs. in England, 2 in MPEC 2012-M42 -- 2012 MY2, 2004 CL
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2012-M42, 2012-M44, 2012-M45, 2012-M46 & 2012-M48 -- 2012 ME7, 2012 MC7, 2012 MB7, 2012 MA7, 2012 KA4, 2012 HD20
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-M46 -- 2012 MC7
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-M46 -- 2012 MC7
I42Westport Obs., 5 in MPEC 2012-M42 -- 2012 LU7, 2012 LG11, 2007 MT20, 53110, 329437
718Wiggins Obs. in Utah, 2 in MPEC 2012-M42 -- 2012 LG11, 1685
198Wildberg Obs. in Germany, 1 in MPEC 2012-M46 -- 2012 MC7
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2012 MF7JPL Sentry16042046-2105161.5e-04-4.67-4.720JPL: "Analysis based on 19 observations spanning 1.8424 days (2012-Jun-23.37429 to 2012-Jun-25.21668)." Diameter approximately 0.015 km. from mean, weighted H=26.8.
2012 MA7JPL Sentry16042050-210928.0e-09-5.71-5.720JPL: "Analysis based on 24 observations spanning 3.0728 days (2012-Jun-22.16999 to 2012-Jun-25.24283)." Diameter approximately 0.260 km. from mean, weighted H=20.6.
2012 MY2JPL Sentry16042072-2106141.2e-05-6.01-6.330JPL: "Analysis based on 52 observations spanning 5.7948 days (2012-Jun-19.18552 to 2012-Jun-24.98029)." Diameter approximately 0.018 km. from mean, weighted H=26.3.
NEODyS1604R E M O V E D-
2012 MU2JPL Sentry1957R E M O V E DJPL: Risk listing removed at 1949 UTC.
2012 LK11JPL Sentry16042026-205847.2e-08-4.67-5.050JPL: "Analysis based on 54 observations spanning 9.0676 days (2012-Jun-15.36399 to 2012-Jun-24.43158)." Diameter approximately 0.302 km. from mean, weighted H=20.3.
NEODyS1604R E M O V E D-

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 25 June '12

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

1957Noted that JPL Sentry has removed 2012 MU2 as an impact risk - see above
1900Noted Radar Astrometry database update - see above
1658Generated Traffic Report
1604Noted that JPL Sentry has updated its 2012 LK11 risk assessment - see above
Noted that NEODyS has removed 2012 LK11 as an impact risk - see above
Noted that JPL Sentry has posted 2012 MA7 as an impact risk - see above
Noted that JPL Sentry has posted 2012 MF7 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-M42 - Daily Orbit Update - see above
Grabbed MPEC 2012-M43 - 2012 MZ6 - see above
Grabbed MPEC 2012-M44 - 2012 MA7 - see above
Grabbed MPEC 2012-M45 - 2012 MB7 - see above
Grabbed MPEC 2012-M46 - 2012 MC7 - see above
Grabbed MPEC 2012-M47 - 2012 MD7 - see above
Grabbed MPEC 2012-M48 - 2012 ME7 - see above
Grabbed MPEC 2012-M49 - 2012 MF7 - see above
Grabbed MPEC 2012-M50 - 2012 MG7 - see above