{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T04:15:53.960Z","years_from_j2000":26.663,"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-103246","name":"HD 103246","class":"f8_yellow_white_star","category":"star","object_type":"F8 yellow-white star","mag":6.77,"mag_band":"V","abs_mag":2.946,"abs_mag_band":"V","distance_ly":189.73625423467203,"distance_method":"parallax","ra_deg":178.4298,"dec_deg":73.756064,"epoch_ra_deg":178.792804,"epoch_dec_deg":73.605837,"epoch_moved_arcsec":3.401,"pm_ra_mas_yr":-48.29,"pm_dec_mas_yr":-118.06,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-103246","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11537+7345","companions":[{"measured":2025,"magnitude":8.32,"components":"AB","discoverer_code":"BU  794","separation_arcsec":0.5,"position_angle_deg":80},{"measured":2015,"magnitude":16.5,"components":"AB,C","discoverer_code":"BU  794","separation_arcsec":5.7,"position_angle_deg":81},{"measured":2015,"magnitude":14.7,"components":"AB,D","discoverer_code":"BU  794","separation_arcsec":37,"position_angle_deg":59}],"spectral_type":"F8","uncertainties":{"metallicity_fe_h":[0.08,0.08]},"color_index_bv":0.574,"luminosity_solar":5.7756384639453335,"metallicity_fe_h":0.22,"radial_velocity_km_s":-35.7,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.22,"surface_temperature_k":6172,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-48.29,"proper_motion_dec_mas_yr":-118.06,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 103246"},{"catalog":"HIP","designation":"HIP 57994"}],"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."}