{"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":"2026-09-03T07:41:59.978Z","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-186203","name":"47 χ Aql","class":"g2ib_b5_5_yellow_supergiant","category":"star","object_type":"G2Ib+B5.5 yellow supergiant","mag":5.28,"mag_band":"V","abs_mag":-1.81,"abs_mag_band":"V","distance_ly":853.8124917432687,"distance_method":"parallax","ra_deg":295.641705,"dec_deg":11.826583,"epoch_ra_deg":295.957304,"epoch_dec_deg":11.889497,"epoch_moved_arcsec":0.294,"pm_ra_mas_yr":3.43,"pm_dec_mas_yr":-10.49,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquila","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-186203","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19426+1150","companions":[{"measured":2021,"magnitude":6.57,"components":"AB","discoverer_code":"STT 380","separation_arcsec":0.4,"position_angle_deg":75},{"measured":2015,"magnitude":12.4,"components":"AC","discoverer_code":"STT 380","separation_arcsec":81,"position_angle_deg":47},{"measured":2011,"magnitude":12.6,"components":"AD","discoverer_code":"DAM 309","separation_arcsec":102.1,"position_angle_deg":137},{"measured":2011,"magnitude":11.52,"components":"AE","discoverer_code":"J  1858","separation_arcsec":132.1,"position_angle_deg":273}],"spectral_type":"G2Ib+B5.5","color_index_bv":0.575,"luminosity_solar":461.31757456037957,"radial_velocity_km_s":-22,"spectral_type_source":"SIMBAD (2002ApJS..143..513G, quality D)","surface_temperature_k":6203,"proper_motion_ra_mas_yr":3.43,"proper_motion_dec_mas_yr":-10.49,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"47 Chi Aql"},{"catalog":"HD","designation":"HD 186203"},{"catalog":"HIP","designation":"HIP 96957"},{"catalog":"HR","designation":"HR 7497"}],"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."}