{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T13:50:45.933Z","years_from_j2000":26.664,"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":"ain","name":"Ain","class":"g9_5iiicn0_5_yellow_giant","category":"star","object_type":"G9.5IIICN0.5 yellow giant","mag":3.53,"mag_band":"V","abs_mag":0.266,"abs_mag_band":"V","distance_ly":146.6529536765565,"distance_method":"parallax","ra_deg":67.154145,"dec_deg":19.180431,"epoch_ra_deg":67.546702,"epoch_dec_deg":19.239856,"epoch_moved_arcsec":3.023,"pm_ra_mas_yr":107.23,"pm_dec_mas_yr":-36.77,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Taurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ain","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"04286+1911","companions":[{"measured":2005,"magnitude":6,"components":"Aa,Ab","discoverer_code":"WSI  53","separation_arcsec":0.2,"position_angle_deg":108},{"measured":2015,"magnitude":10.6,"components":"AB","discoverer_code":"BUP  61","separation_arcsec":190.4,"position_angle_deg":269}],"wikidata_id":"Q405857","spectral_type":"G9.5IIICN0.5","color_index_bv":1.014,"luminosity_solar":68.17105263058534,"wikipedia_article":"Epsilon Tauri","radial_velocity_km_s":39,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","proper_motion_ra_mas_yr":107.23,"proper_motion_dec_mas_yr":-36.77},"designations":[{"catalog":"Bayer/Flamsteed","designation":"74 Epsilon Tau"},{"catalog":"Common name","designation":"Ain"},{"catalog":"Exoplanet host","designation":"ε Tau"},{"catalog":"HD","designation":"HD 28305"},{"catalog":"HIP","designation":"HIP 20889"},{"catalog":"HR","designation":"HR 1409"},{"catalog":"IRAS","designation":"IRAS 04256+1904"}],"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."}