Contents  on 9 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 9 July '13

Two objects reported inside ten LD

Two asteroids are reported within ten lunar distances (LD) of our planet today. 2013 NJ4 is outbound from 4.23 to 4.81 LD and 2013 NH4 leaves ten LD, passing from 9.52 to 12.32 LD.

This report was generated at 1440 UTC with the first follow-up for 2013 NJ4 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 9 July '13

The MPC's NEO Confirmation Page has 16 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had sixteen objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 22 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 9 July '13

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been six MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-N36 - "20:20 UT" - 2013 NL10

MPEC 2013-N35 - "20:16 UT" - 2013 NJ10

MPEC 2013-N34 - "20:13 UT" - 2013 NH10

MPEC 2013-N33 - "20:09 UT" - 2013 NG10

MPEC 2013-N32 - "14:19 UT" - 2011 GD3 = 2008 GF110

<< DOU on 9 July '13 >>  MPEC 2013-N31 - "06:02 UT" - Daily Orbit Update

Observers  on 9 July '13

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-N34 -- 2013 NH10
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPECs 2013-N31 & 2013-N36 -- 2013 NW, 2013 NV, 2013 NL10, 2013 MY5, 2013 MX5, 2013 MS11, 2013 LW28, 2013 LK31, 2013 KM6, 280136, 190135
I74Baxter Garden Obs. in England, 1 in MPEC 2013-N31 -- 351331
Q68Blue Mountains Obs. in New South Wales, 2 in MPEC 2013-N31 -- 232691, 163364
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2013-N36 -- 2013 NL10
K20Danastro Obs., 1 in MPEC 2013-N31 -- 285263
J95Great Shefford Obs. in England, 2 in MPECs 2013-N34 & 2013-N36 -- 2013 NL10, 2013 NH10
K91LCOGT Sutherland A in South Africa, 1 in MPEC 2013-N33 -- 2013 NG10
5682David Tholen's team on Mauna Kea in Hawaii, 5 in MPECs 2013-N31 & 2013-N32 -- 2013 NJ4, 2013 LZ28, 2013 LX28, 2013 KM6, 2011 GD3
568_Marco Micheli on Mauna Kea in Hawaii, 3 in MPECs 2013-N33, 2013-N34 & 2013-N35 -- 2013 NJ10, 2013 NH10, 2013 NG10
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2013-N31 -- 2013 GY68, 2013 EW128
474Mt. John Obs. in New Zealand, 10 in MPEC 2013-N31 -- 2013 NX, 2013 NV, 2013 NP8, 2013 NK4, 2013 NK, 2013 NH6, 2013 MZ5, 2013 LM31, 2013 LK25, 2013 LC2
A13Naef Obs. in Switzerland, 1 in MPEC 2013-N31 -- 9950
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2013-N31, 2013-N33, 2013-N34, 2013-N35 & 2013-N36 -- 2013 NL10, 2013 NJ10, 2013 NH10, 2013 NG10, 86039, 306367
H36Sandlot Obs. in Kansas, 2 in MPECs 2013-N33 & 2013-N36 -- 2013 NL10, 2013 NG10
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPEC 2013-N31 -- 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 9 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 NJ10JPL Sentry22042063-210479.8e-08-4.16-4.200JPL: "Analysis based on 10 observations spanning 3.9570 days (2013-Jul-04.44266 to 2013-Jul-08.399649)." Diameter approximately 0.611 km. from mean, weighted H=18.7.
2013 NH6JPL Sentry14372060-206128.8e-06-3.94-3.940JPL: "Analysis based on 30 observations spanning 4.8388 days (2013-Jul-03.642839 to 2013-Jul-08.48167)." Diameter approximately 0.073 km. from mean, weighted H=23.3.
NEODyS14372060-206528.52e-06-3.95-3.950NEODyS: "Based on 30 optical observations (of which 0 are rejected as outliers) from 2013-07-03.644 to 2013-07-08.482."
2013 NWJPL Sentry14372079-209721.8e-08-6.59-6.640JPL: "Analysis based on 19 observations spanning 5.8063 days (2013-Jul-02.34438 to 2013-Jul-08.150729)." Diameter approximately 0.111 km. from mean, weighted H=22.4.
NEODyS14372097-209711.52e-08-6.75-6.750NEODyS: "Based on 19 optical observations (of which 0 are rejected as outliers) from 2013-07-02.345 to 2013-07-08.152."

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 9 July '13

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

2204Noted that JPL Sentry has posted 2013 NJ10 as an impact risk - see above
2111Grabbed MPEC 2013-N33 - 2013 NG10 - see above
Grabbed MPEC 2013-N34 - 2013 NH10 - see above
Grabbed MPEC 2013-N35 - 2013 NJ10 - see above
Grabbed MPEC 2013-N36 - 2013 NL10 - see above
1440Generated Traffic Report
1437Noted 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 updated its 2013 NW risk assessment - see above
Noted that NEODyS has updated its 2013 NW risk assessment - see above
Grabbed MPEC 2013-N31 - Daily Orbit Update - see above
Grabbed MPEC 2013-N32 - 2011 GD3 = 2008 GF110 - see above