Contents  on 15 July '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 15 July '13

One object reported inside ten LD

One visitor is reported to be within a radius of ten lunar distances (LD) from our home world today. 2013 NJ4 leaves ten LD, traveling from 9.69 to 10.83 LD. Possibly approaching next are 2006 BL8, arriving inside ten LD on July 24th (uncertainty +/- two days), and 2003 DZ15, on July 29th (+/- 26.5 hours).

This report was generated at 1321 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.

Radar Astrometry  on 15 July '13

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 2121 UTC when the database was dated 15 July

NEOCP Activity  on 15 July '13

The MPC's NEO Confirmation Page has 30 listings

When last checked at 2248 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 30 objects listed. Of these, twelve were "one nighters." So far The Tracking News has counted a total of 40 listings on the NEOCP today.

New MPECs  on 15 July '13

Minor Planet Electronic Circulars

As of last check at 2248 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 15 July '13 >>  MPEC 2013-N55 - "06:03 UT" - Daily Orbit Update

Observers  on 15 July '13

Fifteen observers appear in today's MPEC.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 285263
H21Astronomical Research Obs. Westfield in Illinois, 14 in MPEC 2013-N55 -- 2013 NV, 2013 NS13, 2013 NL10, 2013 NG6, 2013 MR6, 2013 LL31, 2013 LK31, 2013 LF16, 2013 KM6, 2013 KJ6, 2013 KB2, 2011 DL19, 2006 JX, 1866
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-N55 -- 2013 NU
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2013-N55 -- 2006 NL
K20Danastro Obs., 2 in MPEC 2013-N55 -- 285263, 17188
J95Great Shefford Obs. in England, 3 in MPEC 2013-N55 -- 2013 NL10, 2013 ML3, 2006 NL
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2013-N55 -- 85804
560Madonna di Dossobuono Obs. in Italy, 1 in MPEC 2013-N55 -- 2007 XY9
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-N55 -- 2013 NJ
711McDonald Obs. in Texas, 1 in MPEC 2013-N55 -- 2013 ML3
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-N55 -- 2011 EL11
A13Naef Obs. in Switzerland, 3 in MPEC 2013-N55 -- 2013 MX5, 2007 XY9, 2003 OB4
F51Pan-STARRS 1 (PS1) in Hawaii, 12 in MPEC 2013-N55 -- 2013 NT11, 2012 XD112, 2011 EL11, 2006 NL, 2000 HW23, 85709, 363617, 187040, 18109, 162723, 5653, 4341
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-N55 -- 2006 NL
E12Siding Spring Survey (SSS) in New South Wales, 3 in MPEC 2013-N55 -- 2013 NT11, 2013 NP8, 2013 NK4
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 July '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2248 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 Sentry1317210944.5e-07-5.42-5.650JPL: "Analysis based on 164 observations spanning 25.690 days (2013-Jun-19.27039 to 2013-Jul-14.9607)." Diameter approximately 0.120 km. from mean, weighted H=22.3.
NEODyS13172109-210921.41e-06-4.92-5.00NEODyS: "Based on 166 optical observations (of which 6 are rejected as outliers) from 2013-06-19.271 to 2013-07-14.961."
2011 EL11NEODyS1317R 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 15 July '13

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

2121Noted Radar Astrometry database update - see above
1321Generated Traffic Report
1317Noted that NEODyS has removed 2011 EL11 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 ML3 risk assessment - see above
Noted that NEODyS has updated its 2013 ML3 risk assessment - see above
Grabbed MPEC 2013-N55 - Daily Orbit Update - see above