{"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":"2026-09-04T05:47:00.652Z","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-195050","name":"40 Cyg","class":"a3v_white_main_sequence_star","category":"star","object_type":"A3V white main-sequence star","mag":5.63,"mag_band":"V","abs_mag":1.076,"abs_mag_band":"V","distance_ly":265.5995753788311,"distance_method":"parallax","ra_deg":306.892755,"dec_deg":38.440332,"epoch_ra_deg":307.140626,"epoch_dec_deg":38.52793,"epoch_moved_arcsec":2.184,"pm_ra_mas_yr":-22.98,"pm_dec_mas_yr":-78.6,"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-195050","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20276+3926","age_years":570709650,"companions":[{"measured":2015,"magnitude":8.4,"components":null,"discoverer_code":"GUL   3","separation_arcsec":0.5,"position_angle_deg":335}],"mass_solar":2.222,"radius_solar":2.526,"spectral_type":"A3V","color_index_bv":0.072,"luminosity_solar":32.329575336809405,"radial_velocity_km_s":0.4,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":3.868,"surface_temperature_k":8828,"proper_motion_ra_mas_yr":-22.98,"proper_motion_dec_mas_yr":-78.6,"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":34.5975},"designations":[{"catalog":"Bayer/Flamsteed","designation":"40 Cyg"},{"catalog":"HD","designation":"HD 195050"},{"catalog":"HIP","designation":"HIP 100907"},{"catalog":"HR","designation":"HR 7826"}],"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."}