{"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":"2026-09-03T06:50:27.246Z","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-209693","name":"HD 209693","class":"g5ib_ii_yellow_supergiant","category":"star","object_type":"G5Ib-II yellow supergiant","mag":6.36,"mag_band":"V","abs_mag":-0.913,"abs_mag_band":"V","distance_ly":929.2204985841352,"distance_method":"parallax","ra_deg":331.143825,"dec_deg":32.941744,"epoch_ra_deg":331.439968,"epoch_dec_deg":33.071693,"epoch_moved_arcsec":0.265,"pm_ra_mas_yr":6.11,"pm_dec_mas_yr":-7.82,"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-209693","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22046+3256","companions":[{"measured":2015,"magnitude":11.3,"components":null,"discoverer_code":"HJ  953","separation_arcsec":20.6,"position_angle_deg":107}],"spectral_type":"G5Ib-II","uncertainties":{"metallicity_fe_h":[0.025,0.025]},"color_index_bv":1.121,"luminosity_solar":201.9296069798118,"metallicity_fe_h":0.075,"radial_velocity_km_s":-22,"spectral_type_source":"SIMBAD (2001AJ....121.2148G, quality C)","surface_gravity_log_g":2.28,"surface_temperature_k":5170,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 2 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":6.11,"proper_motion_dec_mas_yr":-7.82,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"HD","designation":"HD 209693"},{"catalog":"HIP","designation":"HIP 108969"},{"catalog":"HR","designation":"HR 8412"}],"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."}