{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T08:37:43.720Z","years_from_j2000":26.672,"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-2913","name":"51 Psc","class":"b9_5v_blue_white_main_sequence_star","category":"star","object_type":"B9.5V blue-white main-sequence star","mag":5.69,"mag_band":"V","abs_mag":1.148,"abs_mag_band":"V","distance_ly":264.09436369566833,"distance_method":"parallax","ra_deg":8.099084999999999,"dec_deg":6.955463,"epoch_ra_deg":8.445843,"epoch_dec_deg":7.103752,"epoch_moved_arcsec":1.228,"pm_ra_mas_yr":45.91,"pm_dec_mas_yr":3.54,"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-2913","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00324+0657","companions":[{"measured":2022,"magnitude":7.99,"components":"Aa,Ab","discoverer_code":"MCA   1","separation_arcsec":0.2,"position_angle_deg":288},{"measured":1975,"magnitude":9.5,"components":"Aa,Ac","discoverer_code":"OCC9069","separation_arcsec":0.2,"position_angle_deg":-1},{"measured":2018,"magnitude":9.52,"components":"AB","discoverer_code":"STF  36","separation_arcsec":27,"position_angle_deg":84},{"measured":2011,"magnitude":13.1,"components":"AD","discoverer_code":"GMC  10","separation_arcsec":77.7,"position_angle_deg":309},{"measured":2011,"magnitude":9.94,"components":"AC","discoverer_code":"STF  36","separation_arcsec":174,"position_angle_deg":226}],"spectral_type":"B9.5V","color_index_bv":-0.014,"luminosity_solar":30.255198038723073,"radial_velocity_km_s":17,"spectral_type_source":"SIMBAD (2007A&A...463..671R, quality D)","surface_temperature_k":10691,"proper_motion_ra_mas_yr":45.91,"proper_motion_dec_mas_yr":3.54,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"51 Psc"},{"catalog":"HD","designation":"HD 2913"},{"catalog":"HIP","designation":"HIP 2548"},{"catalog":"HR","designation":"HR 132"}],"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."}