{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T18:49:24.711Z","years_from_j2000":26.667,"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-197488","name":"HD 197488","class":"g2v_yellow_main_sequence_star","category":"star","object_type":"G2V yellow main-sequence star","mag":7.59,"mag_band":"V","abs_mag":3.922,"abs_mag_band":"V","distance_ly":176.58725986702152,"distance_method":"parallax","ra_deg":310.58466,"dec_deg":45.823458,"epoch_ra_deg":310.809686,"epoch_dec_deg":45.917769,"epoch_moved_arcsec":5.241,"pm_ra_mas_yr":-56.03,"pm_dec_mas_yr":-188.36,"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-197488","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20423+4549","age_years":8025144000,"companions":[{"measured":2015,"magnitude":10.58,"components":"AB","discoverer_code":"STT 411","separation_arcsec":31.8,"position_angle_deg":349},{"measured":2015,"magnitude":12.2,"components":"AF","discoverer_code":"BKO 158","separation_arcsec":41,"position_angle_deg":143},{"measured":2015,"magnitude":10.23,"components":"AC","discoverer_code":"WAL 132","separation_arcsec":71.2,"position_angle_deg":357}],"mass_solar":1.061,"radius_solar":1.481,"spectral_type":"G2V","color_index_bv":0.613,"luminosity_solar":2.350715115938292,"radial_velocity_km_s":9.4,"spectral_type_source":"SIMBAD (quality C)","surface_gravity_log_g":4.193,"surface_temperature_k":5865,"proper_motion_ra_mas_yr":-56.03,"proper_motion_dec_mas_yr":-188.36,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.3269},"designations":[{"catalog":"HD","designation":"HD 197488"},{"catalog":"HIP","designation":"HIP 102189"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}