NEO 2014 EC as seen from Siding Springs Observatory from 1:00 am 7 March 5:35 am (14:00 - 18:35 UT 6Mar). The crosses mark the position of the asteroid every 5 minutes, the large rectangle is the field of view of T12 and the small that of T9. click to embiggen.
Near Earth Asteroid 2014 EC will come close to Earth on 21:29 UT 6 March at distance of 0.0004 AU (around 0.2 Earth-Moon distances). It has an estimated diameter of 10m. The asteroid is currently magnitude 16.9, and will be mag 13.0 at closest approach. However, none of the iTelescopes will get to see closest approach, and only the Southern scopse really see anything. Before astronomical twilight the asteroid is magnitude 14:00.
60 second exposures may be reasonable in the latter stages but there will be substantial trailing, shorter exposures may be too dim.
NEO 2014 EC is visible for a reasonable time from the southern iTelescopes as it passes through Sextans. The asteroid is visible from start of astronomical twilight in the evening of the 6 March local time until end of astronomical twilight on the 7th (local time). It is moving very fast (starting at 19.12" and finishing at 595.72"/min), and is outside the reach of the tracking capability of the iTelescopes. You will need to use a topocentric ephemeris and camp out on the asteroid track.
There is a substantial parallax effect (> 1 degree), so unless your planetarium program is able to cope with close parallax (most can't), you will need to work from topocentric coordinates. For topocentric ephemerides go to http://www.minorplanetcenter.net/iau/MPEph/MPEph.html
MPC Siding Spring Code62.
You will need to use unguided exposures. Choose a point where the asteroid will pass and aim at that. Remember that it takes time for the iTelescopes scopes to get to tracking position. T12 can take up to 5 minutes (depending on there being reliable stars in the field for tracking, check your logs to see what the average slew time is), so offset you initial position by around 4 minutes or so (this will be a significant distance) so the asteroid will be in field. The asteroid will cross the T12 FOV in about 10 minutes.