{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T07:24:21.065Z","years_from_j2000":26.672,"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-47020","name":"HD 47020","class":"a3v_white_main_sequence_star","category":"star","object_type":"A3V white main-sequence star","mag":6.44,"mag_band":"V","abs_mag":1.009,"abs_mag_band":"V","distance_ly":397.7516165021012,"distance_method":"parallax","ra_deg":99.36370500000001,"dec_deg":24.590851,"epoch_ra_deg":99.775314,"epoch_dec_deg":24.568284,"epoch_moved_arcsec":0.125,"pm_ra_mas_yr":-3.94,"pm_dec_mas_yr":2.55,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Gemini","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-47020","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06375+2435","age_years":333740700,"companions":[{"measured":2012,"magnitude":10.38,"components":null,"discoverer_code":"HDS 910","separation_arcsec":0.5,"position_angle_deg":241}],"mass_solar":2.847,"radius_solar":3.401,"spectral_type":"A3V","color_index_bv":0.101,"luminosity_solar":34.387452222912714,"radial_velocity_km_s":-2,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.743,"surface_temperature_k":10090,"proper_motion_ra_mas_yr":-3.94,"proper_motion_dec_mas_yr":2.55,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":100.9326},"designations":[{"catalog":"HD","designation":"HD 47020"},{"catalog":"HIP","designation":"HIP 31650"},{"catalog":"HR","designation":"HR 2417"}],"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."}