Contents  on 18 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 18 July '13

No objects reported inside ten LD

There are no objects reported passing inside a radius of ten lunar distances (LD) from Earth today. Next known to be possibly approaching are 2006 BL8, which may arrive inside ten LD on July 24th (uncertainty +/- two days), and 2003 DZ15, maybe arriving on July 29th (+/- 26.5 hours).

This report was generated at 1438 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 18 July '13

The MPC's NEO Confirmation Page has 37 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 37 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 41 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 18 July '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 18 July '13 >>  MPEC 2013-O18 - "06:02 UT" - Daily Orbit Update

Observers  on 18 July '13

Ten observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2013-O18 -- 2013 NV, 2013 NU, 2013 NL10, 2013 NH10, 2013 MY6, 2013 MR6, 2013 ML3, 2013 KJ6, 2013 GZ79, 2011 DL19, 350964, 11405
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-O18 -- 2013 OG
309$program code "$" (13) via Cerro Paranal in Chile, 2 in MPEC 2013-O18 -- 87025, 242708
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPEC 2013-O18 -- 2013 NP11, 2013 ND15, 2013 NC15, 2013 MZ5, 2013 KY1, 2013 GF, 2013 EU9, 2011 PT1, 2008 MG1, 2007 ML13, 2004 BE85, 2003 CN17
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2013-O18 -- 2012 XR134, 2010 OQ1
118Modra Obs. in Slovakia, 1 in MPEC 2013-O18 -- 285263
C91Montevenere Obs., 1 in MPEC 2013-O18 -- 285263
F51Pan-STARRS 1 (PS1) in Hawaii, 8 in MPEC 2013-O18 -- 2005 MC, 86039, 343166, 306367, 189973, 154275, 137802, 3752
645Sloan Digital Sky Survey (SDSS) in New Mexico, 2 in MPEC 2013-O18 -- 2010 DM, 358453
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2013-O18 -- 2013 NP11, 354952, 11405
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 July '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 OHNEODyS14332021-2111279.19e-09-5.64-6.030NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2013-07-16.530 to 2013-07-17.388."
JPL Sentry02412021-2096113.3e-09-6.04-6.360JPL: "Analysis based on 11 observations spanning .85756 days (2013-Jul-16.52928 to 2013-Jul-17.386836)." Diameter approximately 0.260 km. from mean, weighted H=20.6.
2013 ML3JPL Sentry1433210942.1e-07-5.75-5.930JPL: "Analysis based on 175 observations spanning 28.052 days (2013-Jun-19.27039 to 2013-Jul-17.322588)." Diameter approximately 0.120 km. from mean, weighted H=22.3.
NEODyS14332109-210913.23e-07-5.56-5.560NEODyS: "Based on 177 optical observations (of which 6 are rejected as outliers) from 2013-06-19.271 to 2013-07-17.323."

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 18 July '13

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

1438Generated Traffic Report
1433Noted that JPL Sentry has updated its 2013 ML3 risk assessment - see above
Noted that NEODyS has updated its 2013 ML3 risk assessment - see above
Noted that NEODyS has posted 2013 OH as an impact risk - see above
Grabbed MPEC 2013-O18 - Daily Orbit Update - see above
0241Noted that JPL Sentry has posted 2013 OH as an impact risk - see above