def hourangle_2_degree(ra_hours, dec_hours, obstime='J2000'):
    """given the coordinate of the target in hours units
    (e.g. 10:58:59.072 +46:40:25.23) this will retour them
    in degree"""
    from astropy.coordinates import SkyCoord
    from astropy import units as u
    c = SkyCoord('%s %s' % (ra_hours, dec_hours), unit=(u.hourangle, u.deg),
        obstime=obstime)
    return c.ra.value, c.dec.value
