{"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":"2026-09-07T02:34:35.489Z","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-222941","name":"HD 222941","class":"g5_yellow_star","category":"star","object_type":"G5 yellow star","mag":8.66,"mag_band":"V","abs_mag":5.315,"abs_mag_band":"V","distance_ly":152.1963074722303,"distance_method":"parallax","ra_deg":356.30826,"dec_deg":8.230839,"epoch_ra_deg":356.652159,"epoch_dec_deg":8.379924,"epoch_moved_arcsec":4.769,"pm_ra_mas_yr":178.53,"pm_dec_mas_yr":-8.55,"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-222941","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"23452+0814","age_years":12646463000,"companions":[{"measured":2017,"magnitude":13.5,"components":"Aa,Ab","discoverer_code":"WSI  95","separation_arcsec":1.2,"position_angle_deg":14},{"measured":2021,"magnitude":11.56,"components":"AB","discoverer_code":"STF3035","separation_arcsec":28.1,"position_angle_deg":311}],"mass_solar":0.89,"radius_solar":1.023,"spectral_type":"G5","color_index_bv":0.761,"luminosity_solar":0.6516283940608423,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1993yCat.3135....0C, quality E)","surface_gravity_log_g":4.358,"surface_temperature_k":5542,"proper_motion_ra_mas_yr":178.53,"proper_motion_dec_mas_yr":-8.55,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.8874},"designations":[{"catalog":"HD","designation":"HD 222941"},{"catalog":"HIP","designation":"HIP 117164"}],"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."}