Contents  on 31 May '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 31 May '13

No objects reported inside ten LD

Yes, we have no asteroids known to be inside a radius of ten lunar distances (LD) from our planet today, but 2009 FE arrives inside our ten-LD reporting "bubble" on June 2nd. Today 285263 1998 QE2 comes its closest to Earth on this passage, reaching 15.2 LD, which wouldn't ordinarily be news here, but this is a very large object, on the order of 2.7 km. in diameter, and has just been discovered to have a satellite about 600 meters wide.

This report was generated at 1302 UTC.

Notes: Ten times the distance to our 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 31 May '13

The MPC's NEO Confirmation Page has 9 listings

When last checked at 1910 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, six 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 31 May '13

Minor Planet Electronic Circulars

As of last check at 1910 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-K51 - "16:53 UT" - 2013 KH6

MPEC 2013-K50 - "16:51 UT" - 2013 KG6

MPEC 2013-K49 - "16:48 UT" - 2013 KF6

<< DOU on 31 May '13 >>  MPEC 2013-K48 - "06:05 UT" - Daily Orbit Update

MPEC 2013-K47 - "03:01 UT" - P/2005 L4 = 2013 K3 (Christensen)

Observers  on 31 May '13

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-K51 -- 2013 KH6
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPEC 2013-K48 -- 2013 JK22, 2013 HR11, 152756
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-K51 -- 2013 KH6
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2013-K48 & 2013-K51 -- 2013 KH6, 2013 JT22, 2013 JR28, 2011 WU95, 2008 OX2, 2008 HO3, 2006 HB, 2005 MO13, 242643, 8014, 5332, 3551
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 10 in MPEC 2013-K48 -- 2013 JT22, 2013 JM7, 2013 HN11, 2013 HJ19, 2013 GR66, 2013 GF, 2013 ES89, 2013 EL28, 2013 CW35, 2012 XF55
G58Chabot Obs. in northern California, 2 in MPEC 2013-K48 -- 2013 KB2, 2013 JK22
448Desert Moon Obs. in New Mexico, 4 in MPECs 2013-K48 & 2013-K51 -- 2013 KH6, 2006 WQ1, 274855, 162470
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-K51 -- 2013 KH6
E19Kingsgrove Obs. in New South Wales, 1 in MPEC 2013-K48 -- 285263
V37LCOGT Fort Davis in Texas, 1 in MPEC 2013-K49 -- 2013 KF6
213Montcabre Obs. in Spain, 1 in MPEC 2013-K48 -- 285263
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2013-K48, 2013-K49 & 2013-K50 -- 2013 KZ1, 2013 KG6, 2013 KF6, 2005 GO22
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2013-K48 -- 2013 GZ79, 141354, 11054
W71Rand II Obs., 1 in MPEC 2013-K48 -- 360191
C95SATINO-1 in France, 1 in MPEC 2013-K51 -- 2013 KH6
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2013-K51 -- 2013 KH6
B74Santa Maria de Montmagastrell Obs. in Spain, 2 in MPECs 2013-K48 & 2013-K49 -- 2013 KF6, 285263
291Spacewatch 1.8m telescope in Arizona, 6 in MPECs 2013-K48 & 2013-K49 -- 2013 KY1, 2013 KF6, 2013 JZ28, 2013 JU22, 2013 JM7, 2013 GF69
6731program code 1 via Table Mtn. Obs. in southern California, 1 in MPEC 2013-K48 -- 163249
954Teide Obs. in the Canary Islands, 2 in MPECs 2013-K48 & 2013-K51 -- 2013 KH6, 2013 JR28
718Wiggins Obs. in Utah, 2 in MPECs 2013-K48 & 2013-K51 -- 2013 KH6, 7888
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-K51 -- 2013 KH6
Q621Hidetaka Sato in Japan via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-K47 -- P/2013 K3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 May '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 1910 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 KG6JPL Sentry19102098-210724.9e-10-9.51-9.650JPL: "Analysis based on 11 observations spanning .99568 days (2013-May-30.27806 to 2013-May-31.27374)." Diameter approximately 0.034 km. from mean, weighted H=25.0.

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 31 May '13

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

1910Noted that JPL Sentry has posted 2013 KG6 as an impact risk - see above
1656Grabbed MPEC 2013-K49 - 2013 KF6 - see above
Grabbed MPEC 2013-K50 - 2013 KG6 - see above
Grabbed MPEC 2013-K51 - 2013 KH6 - see above
1302Generated Traffic Report
1300Grabbed MPEC 2013-K48 - Daily Orbit Update - see above
0443Grabbed MPEC 2013-K47 - P/2005 L4 = 2013 K3 (Christensen) - see above