def coords_to_vizier(ra, dec, search_radius):
    """
    Get vizier search url for objects within search_radius of ra, dec coordinates.
    Include radius from search target, sort by radius from search target.
    http://vizier.u-strasbg.fr/doc/asu-summary.htx
    Args:
        ra (float): right ascension in degrees
        dec (float): declination in degrees
        search_radius (float): search radius around ra, dec in arcseconds

    Returns:
        (str): vizier url for objects at ra, dec
    """
    return 'http://vizier.u-strasbg.fr/viz-bin/VizieR?&-c={},{}&-c.rs={}&-out.add=_r&-sort=_r'.format(
        ra, dec, search_radius)