{"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":"2026-08-27T22:30:23.116Z","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":"hd-79469","name":"22 θ Hya","class":"b9_5v_da1_6_blue_white_main_sequence_star","category":"star","object_type":"B9.5V+DA1.6 blue-white main-sequence star","mag":3.89,"mag_band":"V","abs_mag":1.182,"abs_mag_band":"V","distance_ly":113.48513315740772,"distance_method":"parallax","ra_deg":138.591075,"dec_deg":2.31428,"epoch_ra_deg":138.939806,"epoch_dec_deg":2.201153,"epoch_moved_arcsec":8.692,"pm_ra_mas_yr":112.57,"pm_dec_mas_yr":-306.07,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-79469","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"09144+0219","companions":[{"measured":2022,"magnitude":9.9,"components":"AB","discoverer_code":"HJ 2489","separation_arcsec":20.6,"position_angle_deg":256},{"measured":2008,"magnitude":11.6,"components":"AD","discoverer_code":"B  2674","separation_arcsec":82.4,"position_angle_deg":145},{"measured":2008,"magnitude":12.61,"components":"AC","discoverer_code":"HJ 2489","separation_arcsec":101,"position_angle_deg":298}],"spectral_type":"B9.5V+DA1.6","color_index_bv":-0.06,"luminosity_solar":29.322432823031154,"radial_velocity_km_s":-10,"spectral_type_source":"SIMBAD (2013MNRAS.435.2077H, quality C)","proper_motion_ra_mas_yr":112.57,"proper_motion_dec_mas_yr":-306.07},"designations":[{"catalog":"Bayer/Flamsteed","designation":"22 Theta Hya"},{"catalog":"HD","designation":"HD 79469"},{"catalog":"HIP","designation":"HIP 45336"},{"catalog":"HR","designation":"HR 3665"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}