{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:41:57.827Z","years_from_j2000":26.654,"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":"saiph","name":"Saiph","class":"b0_5ia_blue_white_supergiant","category":"star","object_type":"B0.5Ia blue-white supergiant","mag":2.07,"mag_band":"V","abs_mag":-4.418,"abs_mag_band":"V","distance_ly":647.1356752499889,"distance_method":"parallax","ra_deg":86.939115,"dec_deg":-9.669605,"epoch_ra_deg":87.257673,"epoch_dec_deg":-9.65974,"epoch_moved_arcsec":0.052,"pm_ra_mas_yr":1.55,"pm_dec_mas_yr":-1.2,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Orion","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/saiph","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wikidata_id":"Q14028","also_known_as":["Kappa Orionis","κ Ori","κ Orionis"],"spectral_type":"B0.5Ia","color_index_bv":-0.168,"luminosity_solar":5095.654806081146,"wikipedia_article":"Saiph","radial_velocity_km_s":21,"spectral_type_source":"SIMBAD (2024A&A...690A.176N, quality C)","proper_motion_ra_mas_yr":1.55,"proper_motion_dec_mas_yr":-1.2},"designations":[{"catalog":"Bayer/Flamsteed","designation":"53 Kappa Ori"},{"catalog":"Common name","designation":"Saiph"},{"catalog":"HD","designation":"HD 38771"},{"catalog":"HIP","designation":"HIP 27366"},{"catalog":"HR","designation":"HR 2004"},{"catalog":"IRAS","designation":"IRAS 05453-0941"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}