{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T04:42:58.344Z","years_from_j2000":26.674,"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":"sualocin","name":"Sualocin","class":"b9iv_blue_white_subgiant","category":"star","object_type":"B9IV blue-white subgiant","mag":3.77,"mag_band":"V","abs_mag":-0.685,"abs_mag_band":"V","distance_ly":253.81815470294688,"distance_method":"parallax","ra_deg":309.909525,"dec_deg":15.912072,"epoch_ra_deg":310.220882,"epoch_dec_deg":16.006607,"epoch_moved_arcsec":1.459,"pm_ra_mas_yr":54.14,"pm_dec_mas_yr":7.91,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Delphinus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/sualocin","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20396+1555","companions":[{"measured":2024,"magnitude":6.43,"components":"Aa,Ab","discoverer_code":"WCK   2","separation_arcsec":0.2,"position_angle_deg":224},{"measured":2015,"magnitude":13.4,"components":"AB","discoverer_code":"BU  298","separation_arcsec":35.5,"position_angle_deg":233},{"measured":2015,"magnitude":12.9,"components":"AD","discoverer_code":"BU  298","separation_arcsec":45.4,"position_angle_deg":160},{"measured":2017,"magnitude":11.9,"components":"AC","discoverer_code":"HJ 1554","separation_arcsec":48.4,"position_angle_deg":277},{"measured":2015,"magnitude":12.6,"components":"AE","discoverer_code":"BU  298","separation_arcsec":57.2,"position_angle_deg":304},{"measured":2015,"magnitude":10.7,"components":"AF","discoverer_code":"BU  298","separation_arcsec":72.2,"position_angle_deg":118}],"wikidata_id":"Q13527","also_known_as":["Alpha Delphini"],"spectral_type":"B9IV","color_index_bv":-0.057,"luminosity_solar":163.68165214278085,"wikipedia_article":"Alpha Delphini","radial_velocity_km_s":-3,"spectral_type_source":"SIMBAD (1973ARA&A..11...29M, quality B)","surface_temperature_k":11110,"proper_motion_ra_mas_yr":54.14,"proper_motion_dec_mas_yr":7.91,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"9 Alpha Del"},{"catalog":"Common name","designation":"Sualocin"},{"catalog":"HD","designation":"HD 196867"},{"catalog":"HIP","designation":"HIP 101958"},{"catalog":"HR","designation":"HR 7906"},{"catalog":"IRAS","designation":"IRAS 20373+1544"},{"catalog":"IRAS","designation":"IRAS F20373+1544"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}