{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T19:04:40.283Z","years_from_j2000":26.665,"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-202128","name":"HD 202128","class":"a7vn_white_main_sequence_star","category":"star","object_type":"A7Vn white main-sequence star","mag":6.27,"mag_band":"V","abs_mag":1.556,"abs_mag_band":"V","distance_ly":285.8512771840191,"distance_method":"parallax","ra_deg":318.369945,"dec_deg":15.982395,"epoch_ra_deg":318.685242,"epoch_dec_deg":16.092672,"epoch_moved_arcsec":1.138,"pm_ra_mas_yr":36,"pm_dec_mas_yr":-22.94,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pegasus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-202128","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"21135+1559","companions":[{"measured":2014,"magnitude":7.13,"components":"AB","discoverer_code":"HU  767","separation_arcsec":0.1,"position_angle_deg":183},{"measured":2015,"magnitude":null,"components":"AC","discoverer_code":"HU  767","separation_arcsec":2.2,"position_angle_deg":284}],"spectral_type":"A7Vn","color_index_bv":0.238,"luminosity_solar":20.77782097504266,"radial_velocity_km_s":-30,"spectral_type_source":"SIMBAD (quality C)","surface_temperature_k":8511,"proper_motion_ra_mas_yr":36,"proper_motion_dec_mas_yr":-22.94,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 202128"},{"catalog":"HIP","designation":"HIP 104771"},{"catalog":"HR","designation":"HR 8116"}],"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."}