{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T21:50:40.383Z","years_from_j2000":26.665,"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-89445","name":"HD 89445","class":"f0iii_yellow_white_giant","category":"star","object_type":"F0III yellow-white giant","mag":8.39,"mag_band":"V","abs_mag":1.76,"abs_mag_band":"V","distance_ly":691.0092527113121,"distance_method":"parallax","ra_deg":154.40991,"dec_deg":-59.354893,"epoch_ra_deg":154.641418,"epoch_dec_deg":-59.488853,"epoch_moved_arcsec":0.262,"pm_ra_mas_yr":-8.82,"pm_dec_mas_yr":-4.35,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Carina","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-89445","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":1227652700,"mass_solar":1.881,"radius_solar":3.245,"spectral_type":"F0III","color_index_bv":0.407,"luminosity_solar":17.218685749860068,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality C)","surface_gravity_log_g":3.621,"surface_temperature_k":6825,"proper_motion_ra_mas_yr":-8.82,"proper_motion_dec_mas_yr":-4.35,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":19.0235},"designations":[{"catalog":"HD","designation":"HD 89445"},{"catalog":"HIP","designation":"HIP 50416"}],"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."}