{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T13:01:23.718Z","years_from_j2000":26.667,"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-223701","name":"HD 223701","class":"g5v_yellow_main_sequence_star","category":"star","object_type":"G5V yellow main-sequence star","mag":9.39,"mag_band":"V","abs_mag":4.45,"abs_mag_band":"V","distance_ly":317.2728564568725,"distance_method":"parallax","ra_deg":357.98978999999997,"dec_deg":-48.844446,"epoch_ra_deg":358.34223,"epoch_dec_deg":-48.694514,"epoch_moved_arcsec":2.39,"pm_ra_mas_yr":31.76,"pm_dec_mas_yr":83.81,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Phoenix","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-223701","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":10377456000,"mass_solar":0.978,"radius_solar":1.257,"spectral_type":"G5V","color_index_bv":0.685,"luminosity_solar":1.4454397707459268,"variable_mag_max":9.331,"variable_mag_min":9.441,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1978MSS...C02....0H, quality C)","surface_gravity_log_g":4.298,"surface_temperature_k":5747,"proper_motion_ra_mas_yr":31.76,"proper_motion_dec_mas_yr":83.81,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":1.5473},"designations":[{"catalog":"HD","designation":"HD 223701"},{"catalog":"HIP","designation":"HIP 117682"}],"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."}