Contents  on 20 June '13

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 20 June '13

No objects reported inside ten LD

No asteroids are reported traveling inside ten lunar distances (LD) of Earth today, and none are known to be approaching until late July.

This report was generated at 1335 UTC.

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 20 June '13

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 40 listings on the NEOCP today.

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 20 June '13

Minor Planet Electronic Circulars

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

MPEC 2013-M24 - "18:25 UT" - 2013 ML3

MPEC 2013-M23 - "11:23 UT" - 2012 HR15

<< DOU on 20 June '13 >>  MPEC 2013-M22 - "06:10 UT" - Daily Orbit Update

Observers  on 20 June '13

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
169Airali Obs. in Italy, 1 in MPEC 2013-M22 -- 163364
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPECs 2013-M22 & 2013-M24 -- 2013 ML3, 2013 LK7, 2013 LH16, 2013 LF16, 2013 LE7, 2013 LE16, 2013 LB2, 2013 KJ6, 2013 KB2, 2013 JE1, 2013 GZ79, 2008 HD3, 137802, 10636
703Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2013-M22 & 2013-M24 -- 2013 ML3, 85804, 170013, 9950, 5381
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2013-M24 -- 2013 ML3
448Desert Moon Obs. in New Mexico, 3 in MPEC 2013-M22 -- 2013 LE16, 2013 LB1, 170013
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-M24 -- 2013 ML3
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-M23 -- 2012 HR15
C91Montevenere Obs., 1 in MPEC 2013-M22 -- 285263
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-M24 -- 2013 ML3
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-M22 -- 7977
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2013-M22 -- 2013 FY13, 2000 OG8, 90373, 170013
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2013-M22 -- 2002 NV16, 285263
071Rhozen Obs. in Bulgaria, 1 in MPEC 2013-M22 -- 163249
C95SATINO-1 in France, 1 in MPEC 2013-M22 -- 9950
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-M24 -- 2013 ML3
291Spacewatch 1.8m telescope in Arizona, 2 in MPEC 2013-M22 -- 2013 LZ28, 2013 LG16
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 June '13

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
2013 ML3JPL Sentry20052076-211271.5e-06-4.77-5.250JPL: "Analysis based on 30 observations spanning 1.0142 days (2013-Jun-19.27039 to 2013-Jun-20.28459)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
2013 LZ28JPL Sentry13322060-210627.8e-10-7.77-7.810JPL: "Analysis based on 56 observations spanning 6.0867 days (2013-Jun-13.25363 to 2013-Jun-19.34032)." Diameter approximately 0.108 km. from mean, weighted H=22.5.
NEODyS13322060-210121.24e-08-6.75-6.810NEODyS: "Based on 58 optical observations (of which 3 are rejected as outliers) from 2013-06-13.254 to 2013-06-19.341."
2013 LG16JPL Sentry13322050-210123.1e-09-5.78-5.790JPL: "Analysis based on 41 observations spanning 11.901 days (2013-Jun-07.41346 to 2013-Jun-19.31409)." Diameter approximately 0.450 km. from mean, weighted H=19.4.
NEODyS13322050-205024.52e-09-5.59-5.790NEODyS: "Based on 41 optical observations (of which 0 are rejected as outliers) from 2013-06-07.414 to 2013-06-19.315."

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 20 June '13

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

2005Noted that JPL Sentry has posted 2013 ML3 as an impact risk - see above
1914Grabbed MPEC 2013-M24 - 2013 ML3 - see above
1335Generated Traffic Report
1332Noted that JPL Sentry has updated its 2013 LG16 risk assessment - see above
Noted that NEODyS has updated its 2013 LG16 risk assessment - see above
Noted that JPL Sentry has updated its 2013 LZ28 risk assessment - see above
Noted that NEODyS has updated its 2013 LZ28 risk assessment - see above
Grabbed MPEC 2013-M22 - Daily Orbit Update - see above
Grabbed MPEC 2013-M23 - 2012 HR15 - see above