Contents  on 11 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 11 May '13

One object reported inside ten LD

One asteroid is reported to be inside ten lunar distances (LD) of Earth today. 2013 JR7 is outbound from 9.24 to 9.64 LD.

We reported earlier that no other asteroids were presently known to be coming this close until late July, but then we noticed that new observations of 2009 FE from May 8th reported here (among "other asteroidal objects") have led to an improved orbit calculation that brings it just within ten LD during 2-5 June. It is a fairly good size rock, on the order of 185 meters wide.

This report was updated at 1834 UTC with the return of 2009 FE. Today's first traffic report was generated at 1456 UTC with follow-up in today's DOU MPEC for 2013 JF1.

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 May '13

The MPC's NEO Confirmation Page has 62 listings

When last checked at 2329 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 62 objects listed. Of these, 28 were "one nighters." So far The Tracking News has counted a total of 63 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 May '13

Minor Planet Electronic Circulars

As of last check at 2329 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 11 May '13 >>  MPEC 2013-J41 - "06:04 UT" - Daily Orbit Update

MPEC 2013-J40 - "02:50 UT" - Comet C/2013 J3 (McNaught)

Observers  on 11 May '13

Fourteen observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-J40 -- C/2013 J3
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPEC 2013-J41 -- 2013 JP4, 2013 JO4, 2013 JF1, 2013 JE1, 2013 GZ79, 2013 GY73, 2013 GV68, 2013 GU79, 2013 GU38, 2013 GE84, 2013 GC34, 2013 CN222, 2001 WJ2, 141765, 3551
I47Auger Obs. in Argentina, 1 in MPEC 2013-J40 -- C/2013 J3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-J40 -- C/2013 J3
I39Cruz del Sur Obs. in Argentina, 1 in MPEC 2013-J40 -- C/2013 J3
K93LCOGT Sutherland C in South Africa, 1 in MPEC 2013-J40 -- C/2013 J3
130Lumezzane Obs. in Italy, 5 in MPEC 2013-J41 -- 2013 FY13, 2000 WL63, 360191, 357005, 163249
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-J41 -- 2008 GB110
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPEC 2013-J41 -- 2013 JP4, 2013 HR11, 2013 EL28, 2011 WU95, 2008 TF4, 136874
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-J41 -- 2013 JN7
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2013-J40 & 2013-J41 -- C/2013 J3, 4015
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-J41 -- 2004 GD28, 88710
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-J41 -- 2013 GG69
Q621program code 1 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-J40 -- C/2013 J3
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 May '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2330 and JPL at 2329 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 JM14NEODyS14552021-2087223.68e-09-6.32-6.590NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2013-05-09.350 to 2013-05-10.396."

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 May '13

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

1834Updated Traffic Report
1455Noted that NEODyS has posted 2013 JM14 as an impact risk - see above
Grabbed MPEC 2013-J41 - Daily Orbit Update - see above
0434Grabbed MPEC 2013-J40 - Comet C/2013 J3 (McNaught) - see above