{"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":"2026-09-04T03:36:48.580Z","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":"hd-197912","name":"52 Cyg","class":"k0iiia_orange_giant","category":"star","object_type":"K0IIIa orange giant","mag":4.22,"mag_band":"V","abs_mag":0.27,"abs_mag_band":"V","distance_ly":201.08290845905978,"distance_method":"parallax","ra_deg":311.41564500000004,"dec_deg":30.719715,"epoch_ra_deg":311.692142,"epoch_dec_deg":30.817348,"epoch_moved_arcsec":0.676,"pm_ra_mas_yr":-8.01,"pm_dec_mas_yr":24.04,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cygnus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-197912","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20456+3043","companions":[{"measured":2021,"magnitude":9.5,"components":null,"discoverer_code":"STF2726","separation_arcsec":5.8,"position_angle_deg":74}],"spectral_type":"K0IIIa","uncertainties":{"metallicity_fe_h":[0.112,0.112]},"color_index_bv":1.051,"luminosity_solar":67.92036326171846,"metallicity_fe_h":-0.07,"radial_velocity_km_s":-1,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":2.64,"surface_temperature_k":4740,"metallicity_fe_h_source":"Median of 3 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":-8.01,"proper_motion_dec_mas_yr":24.04,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"52 Cyg"},{"catalog":"HD","designation":"HD 197912"},{"catalog":"HIP","designation":"HIP 102453"},{"catalog":"HR","designation":"HR 7942"}],"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."}