{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T00:07:10.612Z","years_from_j2000":26.671,"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-196606","name":"48 Cyg","class":"b8iiin_blue_white_giant","category":"star","object_type":"B8IIIn blue-white giant","mag":6.32,"mag_band":"V","abs_mag":-0.77,"abs_mag_band":"V","distance_ly":853.8124917432687,"distance_method":"parallax","ra_deg":309.38241,"dec_deg":31.57254,"epoch_ra_deg":309.654622,"epoch_dec_deg":31.66588,"epoch_moved_arcsec":0.24,"pm_ra_mas_yr":8.98,"pm_dec_mas_yr":-0.63,"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-196606","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20375+3134","companions":[{"measured":2015,"magnitude":13.52,"components":"AC","discoverer_code":"STFA 53","separation_arcsec":71.3,"position_angle_deg":0},{"measured":2012,"magnitude":14,"components":"AH","discoverer_code":"FYM 138","separation_arcsec":111,"position_angle_deg":89},{"measured":2012,"magnitude":6.54,"components":"AB","discoverer_code":"STFA 53","separation_arcsec":182.7,"position_angle_deg":177}],"mass_solar":3.792,"radius_solar":4.117,"spectral_type":"B8IIIn","color_index_bv":-0.089,"luminosity_solar":177.010895831742,"radial_velocity_km_s":-19,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.719,"surface_temperature_k":12345,"proper_motion_ra_mas_yr":8.98,"proper_motion_dec_mas_yr":-0.63,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate","bolometric_luminosity_solar":319.718},"designations":[{"catalog":"Bayer/Flamsteed","designation":"48 Cyg"},{"catalog":"HD","designation":"HD 196606"},{"catalog":"HIP","designation":"HIP 101765"},{"catalog":"HR","designation":"HR 7885"}],"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."}