{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T19:45:11.172Z","years_from_j2000":26.684,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"hd-285742","name":"HD 285742","class":"m2_red_star","category":"star","object_type":"M2 red star","mag":10.31,"mag_band":"V","abs_mag":6.704,"abs_mag_band":"V","distance_ly":171.66132009436552,"distance_method":"parallax","ra_deg":66.251715,"dec_deg":16.986579,"epoch_ra_deg":66.638415,"epoch_dec_deg":17.048267,"epoch_moved_arcsec":2.668,"pm_ra_mas_yr":96.17,"pm_dec_mas_yr":-27.39,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-285742","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"M2","color_index_bv":1.04,"luminosity_solar":0.1813009167017021,"radial_velocity_km_s":43,"surface_temperature_k":4718,"proper_motion_ra_mas_yr":96.17,"proper_motion_dec_mas_yr":-27.39,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"GJ 3281"},{"catalog":"HD","designation":"HD 285742"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}