{"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":"2026-08-31T21:10:43.690Z","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-364","name":"HD 364","class":"k1iii_orange_giant","category":"star","object_type":"K1III orange giant","mag":8.22,"mag_band":"V","abs_mag":2.185,"abs_mag_band":"V","distance_ly":525.2115719755382,"distance_method":"parallax","ra_deg":2.077725,"dec_deg":-32.700965,"epoch_ra_deg":2.420041,"epoch_dec_deg":-32.551914,"epoch_moved_arcsec":2.312,"pm_ra_mas_yr":69.69,"pm_dec_mas_yr":-51.57,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sculptor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-364","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00083-3242","age_years":834300760,"companions":[{"measured":1991,"magnitude":11.71,"components":null,"discoverer_code":"RST2233","separation_arcsec":1,"position_angle_deg":219}],"mass_solar":2.248,"radius_solar":7.198,"spectral_type":"K1III","color_index_bv":1.064,"luminosity_solar":11.641260294104908,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_gravity_log_g":3.013,"surface_temperature_k":5063,"proper_motion_ra_mas_yr":69.69,"proper_motion_dec_mas_yr":-51.57,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":26.1035},"designations":[{"catalog":"HD","designation":"HD 364"},{"catalog":"HIP","designation":"HIP 673"}],"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."}