Contents  on 12 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 12 June '13

Two objects reported inside ten LD

Two asteroids are reported to be inside a radius of ten lunar distances (LD) from our planet today. 2013 LD2 is outbound from 6.46 to 7.11 LD and intruder 2013 LR6 leaves ten LD, traveling from 8.17 to 10.32 LD. No other objects are known to be coming this close until late next month.

This report was generated at 1321 UTC with follow-up in today's DOU MPEC for 2013 LD2.

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 12 June '13

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of fourteen 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 12 June '13

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 12 June '13 >>  MPEC 2013-L59 - "06:07 UT" - Daily Orbit Update

Observers  on 12 June '13

A total of 23 observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPEC 2013-L59 -- 2013 LK7, 2013 LH16, 2013 LF7, 2013 KZ1, 2013 KJ6, 2013 KH6, 2013 JZ28, 2013 JX2, 2013 JR28, 2013 JK22, 2013 JE1, 2013 GZ79, 2013 EA, 2012 JG11, 66253, 217796, 137170, 101873
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2013-L59 -- 2013 LC2, 65996, 360433, 355256, 354952, 9950, 7839, 4034, 2329
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2013-L59 -- 2013 LE1, 2013 LD1, 2013 JA29, 2013 EL28, 2011 DL19
Z81Estrella de Mar Obs., 2 in MPEC 2013-L59 -- 2013 LK7, 2013 LB2
203GiaGa Obs. in Italy, 2 in MPEC 2013-L59 -- 2013 LB2, 2013 JR28
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2013-L59 -- 285263
J37Huelva Obs. in Spain, 3 in MPEC 2013-L59 -- 2005 JE46, 285263, 1627
J38La Vara Obs. in Spain, 1 in MPEC 2013-L59 -- 285263
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-L59 -- 2013 BT18
568;program code ";" on Mauna Kea in Hawaii, 1 in MPEC 2013-L59 -- 2012 KU42
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-L59 -- 2013 JR28
C91Montevenere Obs., 1 in MPEC 2013-L59 -- 359592
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2013-L59 -- 2013 JK22, 2013 JA29, 2013 GU38, 2010 UX95
A13Naef Obs. in Switzerland, 2 in MPEC 2013-L59 -- 2009 BL2, 137199
0892Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 10 in MPEC 2013-L59 -- 2013 JR28, 2009 BL2, 2005 JE46, 285263, 163364, 163249, 152756, 137199, 7753, 1627
C47Nonndorf Obs. in Austria, 2 in MPEC 2013-L59 -- 2013 JR28, 285263
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPEC 2013-L59 -- 152770, 7350
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2013-L59 -- 2013 JR28, 2011 WU95, 2009 BL2, 285263, 163249
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2013-L59 -- 2013 LD2, 108519, 1685
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2013-L59 -- 2013 LC7, 2013 LB1, 2013 JQ22, 2008 OX2
291Spacewatch 1.8m telescope in Arizona, 14 in MPEC 2013-L59 -- 2013 LK7, 2013 LH16, 2013 LG16, 2013 LE7, 2013 LE16, 2013 KM6, 2013 KL6, 2013 JM14, 2013 JA29, 2013 GG69, 2013 GF69, 2013 GE84, 2013 BC18, 2004 LJ
Z92West Park Obs., 1 in MPEC 2013-L59 -- 285263
718Wiggins Obs. in Utah, 1 in MPEC 2013-L59 -- 2013 JR28
I89iTelescope Obs. Nerpio in Spain, 1 in MPEC 2013-L59 -- 2013 KN6
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 12 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 LH16JPL Sentry13202024-210945.6e-09-4.37-4.400JPL: "Analysis based on 39 observations spanning 3.9131 days (2013-Jun-07.47239 to 2013-Jun-11.38545)." Diameter approximately 0.625 km. from mean, weighted H=18.7.
2013 LG16JPL Sentry13202048-2111217.4e-07-3.41-3.820JPL: "Analysis based on 19 observations spanning 3.9434 days (2013-Jun-07.41346 to 2013-Jun-11.35687)." Diameter approximately 0.448 km. from mean, weighted H=19.4.
NEODyS13202042-2111237.08e-07-3.40-3.920NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2013-06-07.414 to 2013-06-11.358."
2013 LE16JPL Sentry13202042-210533.2e-07-3.32-3.390JPL: "Analysis based on 46 observations spanning 4.9345 days (2013-Jun-07.23871 to 2013-Jun-12.1732)." Diameter approximately 0.660 km. from mean, weighted H=18.6.
NEODyS13202084-210524.08e-07-3.22-3.290NEODyS: "Based on 46 optical observations (of which 0 are rejected as outliers) from 2013-06-07.239 to 2013-06-12.174."

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 12 June '13

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

1321Generated Traffic Report
1320Noted that JPL Sentry has updated its 2013 LE16 risk assessment - see above
Noted that NEODyS has updated its 2013 LE16 risk assessment - see above
Noted that JPL Sentry has posted 2013 LG16 as an impact risk - see above
Noted that NEODyS has posted 2013 LG16 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 LH16 risk assessment - see above
Grabbed MPEC 2013-L59 - Daily Orbit Update - see above