Contents  on 10 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 10 March '13

Three objects reported inside ten LD

Three asteroids are reported to be not just within a radius of ten lunar distances (LD) from Earth today but, as with yesterday and the day before, all three are inside Earth's Hill sphere. Radar target intruder 2013 EC20 comes its closest to the Moon this time around, 0.77 LD at 0536 UT, and exits the Earth-Moon system at 1031 UT. 2013 EN20 comes its closest to Earth on this passage, reaching 1.2 LD at about 1504 UTC (uncertainty: +/- 21 minutes). And radar target 2013 ET exits Earth's Hill sphere, passing from 2.86 to 4.72 LD.

Headed our way next, risk-listed radar target 2010 EO88 arrives inside ten LD on March 15th and risk-listed 2013 ES11 arrives on March 19th.

This report was generated at 1629 UTC with follow-up in today's DOU MPEC for 2013 ET and distant 136617 1994 CC.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. 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 10 March '13

The MPC's NEO Confirmation Page has 12 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had twelve objects listed. Of these, nine were "one nighters." So far The Tracking News has counted a total of eighteen 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 10 March '13

Minor Planet Electronic Circulars

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

MPEC 2013-E45 - "11:42 UT" - 2013 EL28

MPEC 2013-E44 - "11:37 UT" - 2013 EK28

<< DOU on 10 Mar. '13 >>  MPEC 2013-E43 - "06:05 UT" - Daily Orbit Update

Observers  on 10 March '13

Ten observers appear in today's MPECs.

CodeObserver / observatory
A50Andrushivka Obs. in the Ukraine, 1 in MPEC 2013-E43 -- 276732
493Calar Alto Obs. in Spain, 1 in MPEC 2013-E43 -- 2101
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2013-E43 & 2013-E44 -- 2013 EM20, 2013 EK28, 2012 VV93, 2012 TF53
H75Indian Hill North Obs. in Ohio, 1 in MPEC 2013-E43 -- 2013 EC28
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2013-E43 -- 1999 HA2, 137199
A13Naef Obs. in Switzerland, 2 in MPEC 2013-E43 -- 2013 CX129, 68278
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2013-E43, 2013-E44 & 2013-E45 -- 2013 EL28, 2013 EK28, 2012 TJ146, 136617
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-E45 -- 2013 EL28
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2013-E45 -- 2013 EL28
J08Zonalunar Obs. in Spain, 1 in MPEC 2013-E43 -- 2013 ET
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 10 March '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 EL28JPL Sentry16272018-2110534.0e-08-5.90-6.030JPL: "Analysis based on 8 observations spanning 1.5801 days (2013-Mar-08.60533 to 2013-Mar-10.1854)." Diameter approximately 0.110 km. from mean, weighted H=22.4.
2013 ED28NEODyS16272019-2040128.05e-06-2.69-3.290NEODyS: "Based on 21 optical observations (of which 0 are rejected as outliers) from 2013-03-07.218 to 2013-03-09.061."
JPL Sentry00572019-2110491.3e-05-2.43-2.860JPL: "Analysis based on 21 observations spanning 1.8427 days (2013-Mar-07.21735 to 2013-Mar-09.060005)." Diameter approximately 0.172 km. from mean, weighted H=21.5.
2013 EV27NEODyS16272038-2102111.46e-05-5.56-5.640NEODyS: "Based on 9 optical observations (of which 0 are rejected as outliers) from 2013-03-05.417 to 2013-03-09.186."

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 10 March '13

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

1629Generated Traffic Report
1627Noted that NEODyS has posted 2013 ED28 as an impact risk - see above
Noted that JPL Sentry has posted 2013 EL28 as an impact risk - see above
Noted that NEODyS has posted 2013 EV27 as an impact risk - see above
Grabbed MPEC 2013-E43 - Daily Orbit Update - see above
Grabbed MPEC 2013-E44 - 2013 EK28 - see above
Grabbed MPEC 2013-E45 - 2013 EL28 - see above
0057Noted that JPL Sentry has posted 2013 ED28 as an impact risk - see above