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GJ 1214 is orbited by a transiting super-Earth-mass planet. It is a primarytarget for ongoing efforts to understand the emerging population ofsuper-Earth-mass planets around M dwarfs. We present new precision astrometricmeasurements, a re-analysis of HARPS radial velocity measurements, andmedium-resolution infrared spectroscopy of GJ 1214. We combine thesemeasurements with recent transit follow-up observations and new catalogphotometry to provide a comprehensive update of the star-planet properties. Thedistance is obtained with 0.6% relative uncertainty using CAPScam astrometry.The new value increases the nominal distance to the star by ~10% and issignificantly more precise than previous measurements. Updated Dopplermeasurements combined with published transit observations significantly refinethe constraints on the orbital solution. The analysis of the infrared spectrumand photometry confirm that the star is enriched in metals compared to the Sun.Using all this information, combined with empirical mass-luminosity relationsfor low mass stars, we derive updated values for the bulk properties of thestar-planet system. We also use infrared absolute fluxes to estimate thestellar radius and to re-derive the star-planet properties. Both approachesprovide very consistent values for the system. Our analysis shows indicatesthat the favoured mean density of GJ 1214b is 1.6 +/-0.6 g cm^{-3}. Weillustrate how fundamental properties of M dwarfs are of paramount importancein the proper characterization of the low mass planetary candidates orbitingthem. Given that the distance is now known to better than 1%, interferometricmeasurements of the stellar radius, additional high precision Dopplerobservations, and/or or detection of the secondary transit (occultation), arenecessary to further improve the constraints on the GJ 1214 star-planetproperties.

GJ 1214b revised. Improved trigonometric parallax, stellar parameters, orbital solution, and bulk properties for the super-Earth GJ 1214b