{"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":"2026-08-31T20:52:15.936Z","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-217808","name":"HD 217808","class":"g3_5wa_f_yellow_star","category":"star","object_type":"G3/5wA/F yellow star","mag":9.3,"mag_band":"V","abs_mag":1.324,"abs_mag_band":"V","distance_ly":1284.0802683218405,"distance_method":"parallax","ra_deg":345.96673499999997,"dec_deg":-44.595076,"epoch_ra_deg":346.348344,"epoch_dec_deg":-44.450715,"epoch_moved_arcsec":0.97,"pm_ra_mas_yr":24.33,"pm_dec_mas_yr":-27.04,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Grus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-217808","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"spectral_type":"G3/5wA/F","uncertainties":{"metallicity_fe_h":[0.01,0.01]},"color_index_bv":0.737,"luminosity_solar":25.727642953467797,"metallicity_fe_h":-2.255,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality E)","surface_gravity_log_g":0.9,"surface_temperature_k":4700,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 1 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":24.33,"proper_motion_dec_mas_yr":-27.04,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 217808"},{"catalog":"HIP","designation":"HIP 113888"}],"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."}