{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T05:19:30.013Z","years_from_j2000":26.682,"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-123453","name":"HD 123453","class":"g8_k0_v_a_f_yellow_main_sequence_star","category":"star","object_type":"G8/K0(V)+A/F yellow main-sequence star","mag":7.61,"mag_band":"V","abs_mag":3.617,"abs_mag_band":"V","distance_ly":205.12985679376914,"distance_method":"parallax","ra_deg":212.01708000000002,"dec_deg":-12.928373,"epoch_ra_deg":212.380157,"epoch_dec_deg":-13.056994,"epoch_moved_arcsec":4.319,"pm_ra_mas_yr":117.39,"pm_dec_mas_yr":-111.47,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-123453","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"14081-1256","age_years":4974660000,"companions":[{"measured":2020,"magnitude":9.02,"components":null,"discoverer_code":"STF1802","separation_arcsec":6,"position_angle_deg":276}],"mass_solar":1.123,"radius_solar":1.322,"spectral_type":"G8/K0(V)+A/F","color_index_bv":0.62,"luminosity_solar":3.113149665447022,"radial_velocity_km_s":14.1,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality E)","surface_gravity_log_g":4.166,"surface_temperature_k":6050,"proper_motion_ra_mas_yr":117.39,"proper_motion_dec_mas_yr":-111.47,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":2.1084},"designations":[{"catalog":"HD","designation":"HD 123453"},{"catalog":"HIP","designation":"HIP 69054"}],"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."}