{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T09:07:05.410Z","years_from_j2000":26.68,"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-120623","name":"HD 120623","class":"f0_2iv_yellow_white_subgiant","category":"star","object_type":"F0/2IV yellow-white subgiant","mag":7.79,"mag_band":"V","abs_mag":3.11,"abs_mag_band":"V","distance_ly":281.41196272691656,"distance_method":"parallax","ra_deg":207.73719,"dec_deg":-20.984892,"epoch_ra_deg":208.107076,"epoch_dec_deg":-21.118207,"epoch_moved_arcsec":1.684,"pm_ra_mas_yr":-61.76,"pm_dec_mas_yr":-13.01,"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-120623","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":1439431300,"mass_solar":1.395,"radius_solar":1.521,"spectral_type":"F0/2IV","color_index_bv":0.377,"luminosity_solar":4.96592321450336,"radial_velocity_km_s":-25.5,"spectral_type_source":"SIMBAD (1988MSS...C04....0H, quality D)","surface_gravity_log_g":4.136,"surface_temperature_k":6814,"proper_motion_ra_mas_yr":-61.76,"proper_motion_dec_mas_yr":-13.01,"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":4.5475},"designations":[{"catalog":"HD","designation":"HD 120623"},{"catalog":"HIP","designation":"HIP 67588"}],"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."}