{"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":"2026-08-31T20:49:19.338Z","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-203802","name":"HD 203802","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":8.1,"mag_band":"V","abs_mag":3.179,"abs_mag_band":"V","distance_ly":314.51911815981003,"distance_method":"parallax","ra_deg":320.58528,"dec_deg":57.565231,"epoch_ra_deg":320.778128,"epoch_dec_deg":57.679592,"epoch_moved_arcsec":2.175,"pm_ra_mas_yr":76.68,"pm_dec_mas_yr":27.78,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cepheus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-203802","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21223+5734","age_years":6176005400,"companions":[{"measured":2020,"magnitude":10.69,"components":"AB","discoverer_code":"A   764","separation_arcsec":1.3,"position_angle_deg":21},{"measured":2016,"magnitude":8.69,"components":"AC","discoverer_code":"POP1233","separation_arcsec":84.1,"position_angle_deg":192}],"mass_solar":1.14,"radius_solar":1.68,"spectral_type":"G5","uncertainties":{"metallicity_fe_h":[0.01,0.01]},"color_index_bv":0.56,"luminosity_solar":4.660151117021841,"metallicity_fe_h":0.14,"radial_velocity_km_s":-47,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.062,"surface_temperature_k":5970,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":76.68,"proper_motion_dec_mas_yr":27.78,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":3.1388},"designations":[{"catalog":"HD","designation":"HD 203802"},{"catalog":"HIP","designation":"HIP 105522"}],"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."}