Contents  on 30 March '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 30 March '13

Three objects reported inside ten LD

There are three asteroids reported to be within ten lunar distances (LD) of our world today. Radar target 2013 FB8 comes its closest to Earth this time around, reaching 4.22 LD at 1553 UT, while risk-listed 2013 EL89 is outbound from 4.60 to 5.06 LD and 2013 FD8 departs from inside ten LD, moving from 9.84 to 11.06 LD.

Up next, risk-listed 2010 GM23 arrives inside ten LD on April 10th.

This report was generated at 1511 UTC with follow-up in today's DOU MPEC for 2013 FB8 plus observation of distant 68216 2001 CV26 and of 2012 QG42 from last September.

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 30 March '13

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2320 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. So far The Tracking News has counted a total of two 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 30 March '13

Minor Planet Electronic Circulars

As of last check at 2320 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 30 Mar. '13 >>  MPEC 2013-F59 - "06:01 UT" - Daily Orbit Update

Observers  on 30 March '13

Nine observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 34 in MPEC 2013-F59 -- 2013 FM9, 2013 FB8, 2013 EW27, 2013 EW108, 2013 EV108, 2013 EQ4, 2013 ED28, 2013 EA, 2013 CU129, 2013 CN222, 2013 CN128, 2013 AU76, 2013 AM60, 2012 MM11, 2011 BK24, 2009 UM3, 2009 BL2, 2007 EP88, 2005 YO180, 68278, 68216, 357618, 350513, 343098, 275974, 25916, 163696, 153267, 152952, 136993, 6047, 5645, 1866, 1864
I57Elche Obs., 3 in MPEC 2013-F59 -- 68216, 22771, 5645
711McDonald Obs. in Texas, 1 in MPEC 2013-F59 -- 2013 FB8
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-F59 -- 2012 VV93
W71Rand II Obs., 1 in MPEC 2013-F59 -- 2012 QG42
E12Siding Spring Survey (SSS) in New South Wales, 6 in MPEC 2013-F59 -- 2013 FY13, 2013 CW35, 2012 MR4, 242216, 3199, 1036 Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-F59 -- 2013 EA
J84South Obs. in England, 1 in MPEC 2013-F59 -- 2013 FB8
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-F59 -- 2013 EM20
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 30 March '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS at 2321 and JPL at 2320 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 EH68NEODyS15072095-209527.44e-08-6.02-6.050NEODyS: "Based on 54 optical observations (of which 0 are rejected as outliers) from 2013-03-13.469 to 2013-03-20.289."
2013 ED28JPL Sentry1507203611.5e-05-2.52-2.520JPL: "Analysis based on 41 observations spanning 21.868 days (2013-Mar-07.21735 to 2013-Mar-29.085141)." Diameter approximately 0.170 km. from mean, weighted H=21.4.
NEODyS1507R E M O V E D-
2008 AO112JPL Sentry1729R E M O V E DJPL: Risk listing removed at 1645 UTC.

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 30 March '13

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

1729Noted that JPL Sentry has removed 2008 AO112 as an impact risk - see above
1511Generated Traffic Report
1507Noted that JPL Sentry has updated its 2013 ED28 risk assessment - see above
Noted that NEODyS has removed 2013 ED28 as an impact risk - see above
Noted that NEODyS has updated its 2013 EH68 risk assessment - see above
Grabbed MPEC 2013-F59 - Daily Orbit Update - see above