{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T09:51:49.120Z","years_from_j2000":26.672,"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-152303","name":"HD 152303","class":"f4v_yellow_white_main_sequence_star","category":"star","object_type":"F4V yellow-white main-sequence star","mag":5.99,"mag_band":"V","abs_mag":3.202,"abs_mag_band":"V","distance_ly":117.74604007589926,"distance_method":"parallax","ra_deg":250.7757,"dec_deg":77.513973,"epoch_ra_deg":250.489506,"epoch_dec_deg":77.463763,"epoch_moved_arcsec":5.708,"pm_ra_mas_yr":56.38,"pm_dec_mas_yr":206.46,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ursa Minor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-152303","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16431+7731","age_years":2381626000,"companions":[{"measured":2016,"magnitude":10.2,"components":"AB","discoverer_code":"KU    1","separation_arcsec":2.4,"position_angle_deg":175},{"measured":2020,"magnitude":11.54,"components":"AC","discoverer_code":"KU    1","separation_arcsec":102.5,"position_angle_deg":13}],"mass_solar":1.331,"radius_solar":1.585,"spectral_type":"F4V","color_index_bv":0.43,"luminosity_solar":4.562469770768502,"radial_velocity_km_s":7,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":4.117,"surface_temperature_k":6521,"proper_motion_ra_mas_yr":56.38,"proper_motion_dec_mas_yr":206.46,"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":4.0711},"designations":[{"catalog":"HD","designation":"HD 152303"},{"catalog":"HIP","designation":"HIP 81854"},{"catalog":"HR","designation":"HR 6267"}],"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."}