{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T03:05:03.786Z","years_from_j2000":26.682,"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-223778","name":"HD 223778","class":"k3v_orange_dwarf","category":"star","object_type":"K3V orange dwarf","mag":6.36,"mag_band":"V","abs_mag":6.175,"abs_mag_band":"V","distance_ly":35.52136494075281,"distance_method":"parallax","ra_deg":358.10299499999996,"dec_deg":75.544588,"epoch_ra_deg":358.430834,"epoch_dec_deg":75.694333,"epoch_moved_arcsec":9.189,"pm_ra_mas_yr":341.82,"pm_dec_mas_yr":41.88,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cepheus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-223778","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23524+7533","companions":[{"measured":2016,"magnitude":11.4,"components":"AB","discoverer_code":"BU  996","separation_arcsec":2.2,"position_angle_deg":314},{"measured":2003,"magnitude":9.14,"components":"AC","discoverer_code":"BU  996","separation_arcsec":146.4,"position_angle_deg":142}],"spectral_type":"K3V","uncertainties":{"metallicity_fe_h":[0.26,0.26]},"color_index_bv":0.977,"luminosity_solar":0.2951209226666385,"metallicity_fe_h":-1.02,"radial_velocity_km_s":1.7,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":4.61,"surface_temperature_k":4754,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":341.82,"proper_motion_dec_mas_yr":41.88,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 909A"},{"catalog":"HD","designation":"HD 223778"},{"catalog":"HIP","designation":"HIP 117712"},{"catalog":"HR","designation":"HR 9038"}],"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."}