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The Asteroid Redirect Mission (ARM) under development by NASA is beingplanned to collect a multi-meter boulder from a near-Earth asteroid (NEA), andto bring it to the cis-lunar space in the mid-2020's for future study andexploitation by a crewed mission. The MarcoPolo-M5 project is being proposed in2016 for the M5 mission opportunity by ESA, to bring back to Earth a samplefrom a very primitive D-type NEA.  We aim to further characterize the physical properties of two optimal targetsfor sample return space missions, the low-DeltaV NEAs (341843) 2008 EV5 and(52381) 1993 HA. 2008 EV5 is the baseline target of ARM, but only one spectrumof this object exists in the literature. 1993 HA is a very favourable targetfor a space mission based on its dynamical properties: here we intend to assessif it is a suitable target for MarcoPolo-M5.  We obtained visible spectroscopy of 2008 EV5 with the FORS2 instrument atESO-VLT, at different rotational phases. We also obtained visible andnear-infrared spectroscopy of 1993 HA, using the EFOSC2 and SOfI instruments atESO-NTT. Visible photometry of 1993 HA was carried out within the IMPACTONproject at the Observatorio Astronomico do Sertao de Itaparica (Brazil).  Our new observations are in agreement with the C-type classification of 2008EV5. We obtained five visible spectra which do not show any variability withinthe limits of noise, suggesting a homogeneous surface. We obtained the firstever spectroscopic dataset for 1993 HA, finding a featureless, red-slopedbehaviour typical of D-types. We found that the synodic rotation period of 1993HA is 4.107+-0.002 h. The derived lightcurve also suggests an elongated shape(axis ratio a/b>=1.71). At this stage 1993 HA does indeed seem to be the mostfavourable target for MarcoPolo-M5, though future observations are necessary tostudy it further.

astronomy and astrophysics

An investigation of the low-DeltaV near-Earth asteroids (341843) 2008  EV5 and (52381) 1993 HA. Two suitable targets for the ARM and MarcoPolo-M5  space missions