{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T20:17:08.423Z","years_from_j2000":26.676,"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-158306","name":"HD 158306","class":"f3_5iii_iv_yellow_white_giant","category":"star","object_type":"F3/5III/IV yellow-white giant","mag":6.94,"mag_band":"V","abs_mag":2.384,"abs_mag_band":"V","distance_ly":265.81614321363503,"distance_method":"parallax","ra_deg":262.641315,"dec_deg":-43.22607,"epoch_ra_deg":263.125081,"epoch_dec_deg":-43.247068,"epoch_moved_arcsec":1.303,"pm_ra_mas_yr":40.44,"pm_dec_mas_yr":-27.4,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Scorpius","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-158306","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17306-4314","age_years":1711293100,"companions":[{"measured":2015,"magnitude":12,"components":null,"discoverer_code":"B  2410","separation_arcsec":13.5,"position_angle_deg":272}],"mass_solar":1.58,"radius_solar":2.166,"spectral_type":"F3/5III/IV","color_index_bv":0.393,"luminosity_solar":9.69170083947291,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality E)","surface_gravity_log_g":3.888,"surface_temperature_k":6740,"proper_motion_ra_mas_yr":40.44,"proper_motion_dec_mas_yr":-27.4,"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":8.7513},"designations":[{"catalog":"HD","designation":"HD 158306"},{"catalog":"HIP","designation":"HIP 85682"}],"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."}