{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T16:18:10.501Z","years_from_j2000":26.686,"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":"hip-31931","name":"HIP 31931","class":"orange_star","category":"star","object_type":"Orange star","mag":10.35,"mag_band":"V","abs_mag":7.097,"abs_mag_band":"V","distance_ly":145.865938337126,"distance_method":"parallax","ra_deg":100.09503000000001,"dec_deg":-82.380046,"epoch_ra_deg":99.329133,"epoch_dec_deg":-82.400908,"epoch_moved_arcsec":7.721,"pm_ra_mas_yr":-65.82,"pm_dec_mas_yr":281.74,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Mensa","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-31931","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06404-8223","age_years":13004432000,"companions":[{"measured":2021,"magnitude":14.81,"components":null,"discoverer_code":"KPP2879","separation_arcsec":1.6,"position_angle_deg":114}],"mass_solar":0.721,"radius_solar":0.757,"color_index_bv":1.086,"luminosity_solar":0.12624087614670473,"radial_velocity_km_s":0,"surface_gravity_log_g":4.553,"surface_temperature_k":4590,"proper_motion_ra_mas_yr":-65.82,"proper_motion_dec_mas_yr":281.74,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.2105},"designations":[{"catalog":"HIP","designation":"HIP 31931"}],"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."}