{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T10:31:00.402Z","years_from_j2000":26.675,"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-224983","name":"HD 224983","class":"k0_orange_star","category":"star","object_type":"K0 orange star","mag":8.48,"mag_band":"V","abs_mag":6.01,"abs_mag_band":"V","distance_ly":101.73306655551802,"distance_method":"parallax","ra_deg":0.58977,"dec_deg":11.006236,"epoch_ra_deg":0.933786,"epoch_dec_deg":11.155443,"epoch_moved_arcsec":1.155,"pm_ra_mas_yr":-2.65,"pm_dec_mas_yr":-43.21,"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-224983","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00024+1100","age_years":11796440000,"companions":[{"measured":2016,"magnitude":13.4,"components":null,"discoverer_code":"KPP4405","separation_arcsec":4.7,"position_angle_deg":103}],"mass_solar":0.821,"radius_solar":0.864,"spectral_type":"K0","color_index_bv":0.888,"luminosity_solar":0.34355794789987454,"metallicity_fe_h":0.12,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.504,"surface_temperature_k":5090,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":-2.65,"proper_motion_dec_mas_yr":-43.21,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.448},"designations":[{"catalog":"HD","designation":"HD 224983"},{"catalog":"HIP","designation":"HIP 184"}],"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."}