{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T09:19:19.659Z","years_from_j2000":26.666,"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-5641","name":"HD 5641","class":"a2v_white_main_sequence_star","category":"star","object_type":"A2V white main-sequence star","mag":6.47,"mag_band":"V","abs_mag":0.905,"abs_mag_band":"V","distance_ly":423.0303665570374,"distance_method":"parallax","ra_deg":14.578725,"dec_deg":21.404495,"epoch_ra_deg":14.936728,"epoch_dec_deg":21.549589,"epoch_moved_arcsec":0.274,"pm_ra_mas_yr":-9.65,"pm_dec_mas_yr":-3.49,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-5641","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00583+2124","companions":[{"measured":2017,"magnitude":8.77,"components":null,"discoverer_code":"BU  302","separation_arcsec":0.3,"position_angle_deg":231}],"spectral_type":"A2V","color_index_bv":0.089,"luminosity_solar":37.84425847170932,"radial_velocity_km_s":-6,"spectral_type_source":"SIMBAD (2007A&A...463..671R, quality D)","surface_temperature_k":8974,"proper_motion_ra_mas_yr":-9.65,"proper_motion_dec_mas_yr":-3.49,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 5641"},{"catalog":"HIP","designation":"HIP 4558"},{"catalog":"HR","designation":"HR 277"}],"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."}