Contents  on 11 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 11 July '13

One object reported inside ten LD

There is one asteroid reported moving within ten lunar distances (LD) of our planet today. 2013 NJ4 is departing, traveling from 5.60 to 6.52 LD.

This report was generated at 1408 UTC with observation of departed 2009 FE reported in today's DOU MPEC.

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 11 July '13

The MPC's NEO Confirmation Page has 7 listings

When last checked at 2315 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had seven objects listed. So far The Tracking News has counted a total of twelve 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 11 July '13

Minor Planet Electronic Circulars

As of last check at 2315 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-N41 - "20:50 UT" - 2013 NP11

MPEC 2013-N40 - "20:46 UT" - 2013 NO11

MPEC 2013-N39 - "11:04 UT" - 2003 HG2

<< DOU on 11 July '13 >>  MPEC 2013-N38 - "06:02 UT" - Daily Orbit Update

Observers  on 11 July '13

Thirteen observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-N41 -- 2013 NP11
H21Astronomical Research Obs. Westfield in Illinois, 12 in MPEC 2013-N38 -- 2013 NV, 2013 MY6, 2013 MR6, 2013 ML3, 2013 LM31, 2013 LK31, 2013 LH25, 2013 LF16, 2013 KJ6, 2013 JK22, 2008 HD3, 142555
C77Bernezzo Obs. in Italy, 2 in MPEC 2013-N38 -- 2006 NL, 340666
448Desert Moon Obs. in New Mexico, 5 in MPEC 2013-N38 -- 2013 MY6, 2013 LH16, 2009 FE, 2006 YN, 189865
J95Great Shefford Obs. in England, 1 in MPEC 2013-N41 -- 2013 NP11
K91LCOGT Sutherland A in South Africa, 4 in MPECs 2013-N38, 2013-N40 & 2013-N41 -- 2013 NW, 2013 NP11, 2013 NO11, 2013 NH6
C01Lohrmann Obs. in Germany, 6 in MPEC 2013-N38 -- 363790, 359592, 355256, 354952, 163249, 162269
5682David Tholen's team on Mauna Kea in Hawaii, 3 in MPECs 2013-N38, 2013-N39 & 2013-N41 -- 2013 NP11, 2013 JN7, 2003 HG2
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-N40 -- 2013 NO11
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-N38 -- 2013 JT22
C91Montevenere Obs., 1 in MPEC 2013-N38 -- 285263
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2013-N40 & 2013-N41 -- 2013 NP11, 2013 NO11
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-N40 -- 2013 NO11
673!program code "!" (10) via Table Mtn. Obs. in southern California, 1 in MPEC 2013-N38 -- 2013 LM31
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 July '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2315 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 NH6JPL Sentry14042060-206136.9e-06-4.03-4.040JPL: "Analysis based on 33 observations spanning 7.2252 days (2013-Jul-03.642839 to 2013-Jul-10.86801)." Diameter approximately 0.074 km. from mean, weighted H=23.3.
NEODyS14042060-206536.94e-06-4.04-4.040NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2013-07-03.644 to 2013-07-10.869."
2013 NWNEODyS1404R E M O V E D-
JPL Sentry1404R E M O V E DJPL: Risk listing removed at 0949 UTC.
2013 ML3JPL Sentry1404210944.8e-07-5.38-5.620JPL: "Analysis based on 155 observations spanning 20.954 days (2013-Jun-19.27039 to 2013-Jul-10.224207)." Diameter approximately 0.120 km. from mean, weighted H=22.3.
NEODyS14042109-210921.7e-06-4.83-4.890NEODyS: "Based on 157 optical observations (of which 6 are rejected as outliers) from 2013-06-19.271 to 2013-07-10.225."

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 11 July '13

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

2100Grabbed MPEC 2013-N40 - 2013 NO11 - see above
Grabbed MPEC 2013-N41 - 2013 NP11 - see above
1408Generated Traffic Report
1404Noted 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 JPL Sentry has updated its 2013 NH6 risk assessment - see above
Noted that NEODyS has updated its 2013 NH6 risk assessment - see above
Noted that JPL Sentry has removed 2013 NW as an impact risk - see above
Noted that NEODyS has removed 2013 NW as an impact risk - see above
Grabbed MPEC 2013-N38 - Daily Orbit Update - see above
Grabbed MPEC 2013-N39 - 2003 HG2 - see above