{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T08:12:57.679Z","years_from_j2000":26.666,"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-71973","name":"HD 71973","class":"a2m_white_star","category":"star","object_type":"A2m white star","mag":6.31,"mag_band":"V","abs_mag":1.915,"abs_mag_band":"V","distance_ly":246.90103024433017,"distance_method":"parallax","ra_deg":129.203205,"dec_deg":74.723677,"epoch_ra_deg":129.972489,"epoch_dec_deg":74.630086,"epoch_moved_arcsec":0.638,"pm_ra_mas_yr":-16.05,"pm_dec_mas_yr":-17.74,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Camelopardalis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-71973","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08368+7443","age_years":1196175600,"companions":[{"measured":2016,"magnitude":9.7,"components":null,"discoverer_code":"STT 192","separation_arcsec":1.4,"position_angle_deg":234}],"mass_solar":1.761,"radius_solar":2.317,"spectral_type":"A2m","color_index_bv":0.308,"luminosity_solar":14.92794409578996,"radial_velocity_km_s":-6,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.865,"surface_temperature_k":7288,"proper_motion_ra_mas_yr":-16.05,"proper_motion_dec_mas_yr":-17.74,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":13.7064},"designations":[{"catalog":"HD","designation":"HD 71973"},{"catalog":"HIP","designation":"HIP 42249"},{"catalog":"HR","designation":"HR 3352"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}