{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T23:42:30.702Z","years_from_j2000":26.668,"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-64917","name":"HD 64917","class":"a_3_v_white_star","category":"star","object_type":"A(3)(V) white star","mag":7.72,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":119.09504999999999,"dec_deg":4.254114,"epoch_ra_deg":119.448719,"epoch_dec_deg":4.183042,"epoch_moved_arcsec":0.099,"pm_ra_mas_yr":-3.64,"pm_dec_mas_yr":-0.74,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Canis Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-64917","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"07564+0415","companions":[{"measured":2015,"magnitude":12.84,"components":null,"discoverer_code":"BAL2798","separation_arcsec":19.3,"position_angle_deg":195}],"spectral_type":"A(3)(V)","color_index_bv":0.14,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality E)","proper_motion_ra_mas_yr":-3.64,"proper_motion_dec_mas_yr":-0.74},"designations":[{"catalog":"HD","designation":"HD 64917"},{"catalog":"HIP","designation":"HIP 38793"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}