Contents  on 3 April '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 3 April '13

Two objects reported inside ten LD

Two asteroids are reported moving within ten lunar distances (LD) of our planet today. Radar target 2013 FB8 is outbound from 7.24 to 8.73 LD and risk-listed 2013 EL89 leaves ten LD, passing from 9.31 to 11.09 LD. Next known to be on approach is risk-listed 2010 GM23, which arrives inside ten LD on April 10th.

This report was generated at 1403 UTC, noting that radar observation of 2012 DA14 from mid-February was posted yesterday.

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 3 April '13

The MPC's NEO Confirmation Page has 11 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, eight were "one nighters." So far The Tracking News has counted a total of 21 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 3 April '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-G11 - "19:25 UT" - 2009 KE3

MPEC 2013-G10 - "18:18 UT" - 2013 GJ

MPEC 2013-G09 - "18:15 UT" - 2013 GH

MPEC 2013-G08 - "18:11 UT" - 2013 GG

MPEC 2013-G07 - "18:07 UT" - 2013 GF

<< DOU on 3 Apr. '13 >>  MPEC 2013-G06 - "06:02 UT" - Daily Orbit Update

Observers  on 3 April '13

Eighteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2013-G06, 2013-G07, 2013-G08, 2013-G09, 2013-G10 & 2013-G11 -- 2013 GJ, 2013 GH, 2013 GG, 2013 GF, 2013 FW13, 2013 FQ10, 2013 FA8, 2013 EW27, 2013 EW108, 2013 EV108, 2013 EO4, 2013 EO126, 2013 EN89, 2013 EL28, 2013 EH68, 2013 EC28, 2013 EA, 2012 VL94, 2009 KE3
703Catalina Sky Survey (CSS) in Arizona, 9 in MPEC 2013-G06 -- 2013 FQ10, 2011 YQ10, 2009 SC15, 68278, 357028, 354952, 161998, 11284, 8567
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2013-G06 & 2013-G09 -- 2013 GH, 2013 EW108, 2013 DM1
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2013-G06 -- 2013 EV108, 2013 EO126
C73Galati Obs. in Romania, 7 in MPEC 2013-G06 -- 2013 EV108, 2013 EO126, 40267, 350988, 274855, 152952, 7888
J95Great Shefford Obs. in England, 3 in MPECs 2013-G07, 2013-G08 & 2013-G09 -- 2013 GH, 2013 GG, 2013 GF
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-G09 -- 2013 GH
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-G06 -- 2013 FQ10
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2013-G06, 2013-G07, 2013-G08 & 2013-G09 -- 2013 GH, 2013 GG, 2013 GF, 2012 QC8, 2010 CE55
J93Mt. Tuffley Obs. in England, 2 in MPEC 2013-G06 -- 5645, 1036
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-G06, 2013-G07 & 2013-G08 -- 2013 GG, 2013 GF, 2010 CE55
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-G07 -- 2013 GF
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2013-G06 & 2013-G10 -- 2013 GJ, 2013 FY13
691Spacewatch 0.9m telescope in Arizona, 6 in MPECs 2013-G06, 2013-G07 & 2013-G09 -- 2013 GH, 2013 GF, 2013 FZ7, 2013 FW13, 2013 FA8, 2013 EC28
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-G07 & 2013-G08 -- 2013 GG, 2013 GF
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-G06 -- 2013 EV89
718Wiggins Obs. in Utah, 2 in MPEC 2013-G06 -- 2013 EV108, 2013 EO126
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2013-G06 -- 2008 SE85, 6047
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 April '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 FW13JPL Sentry1357R E M O V E DJPL: Risk listing removed at 0954 UTC.
2013 EH68NEODyS13572095-209513.5e-08-6.34-6.340NEODyS: "Based on 57 optical observations (of which 0 are rejected as outliers) from 2013-03-13.469 to 2013-04-01.203."

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 3 April '13

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

2359Grabbed MPEC 2013-G11 - 2009 KE3 - see above
1901Grabbed MPEC 2013-G07 - 2013 GF - see above
Grabbed MPEC 2013-G08 - 2013 GG - see above
Grabbed MPEC 2013-G09 - 2013 GH - see above
Grabbed MPEC 2013-G10 - 2013 GJ - see above
1403Generated Traffic Report
1357Noted that NEODyS has updated its 2013 EH68 risk assessment - see above
Noted that JPL Sentry has removed 2013 FW13 as an impact risk - see above
Grabbed MPEC 2013-G06 - Daily Orbit Update - see above