{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T18:54:15.661Z","years_from_j2000":26.673,"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-212330","name":"HD 212330","class":"g2iv_v_yellow_subgiant","category":"star","object_type":"G2IV-V yellow subgiant","mag":5.31,"mag_band":"V","abs_mag":3.745,"abs_mag_band":"V","distance_ly":67.06884057540482,"distance_method":"parallax","ra_deg":336.23457,"dec_deg":-57.797415,"epoch_ra_deg":336.679047,"epoch_dec_deg":-57.663733,"epoch_moved_arcsec":10.065,"pm_ra_mas_yr":180.71,"pm_dec_mas_yr":-331.27,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Tucana","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-212330","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"22249-5748","companions":[{"measured":2022,"magnitude":13.6,"components":"Aa,Ab","discoverer_code":"GKM9516","separation_arcsec":0.9,"position_angle_deg":245},{"measured":2016,"magnitude":13,"components":"AB","discoverer_code":"I   383","separation_arcsec":23.6,"position_angle_deg":248},{"measured":2010,"magnitude":13.26,"components":"AC","discoverer_code":"I   383","separation_arcsec":82.7,"position_angle_deg":262}],"spectral_type":"G2IV-V","uncertainties":{"metallicity_fe_h":[0.094,0.094]},"color_index_bv":0.665,"luminosity_solar":2.7669416454115106,"metallicity_fe_h":-0.02,"radial_velocity_km_s":7.8,"spectral_type_source":"SIMBAD (2006AJ....132..161G, quality C)","surface_gravity_log_g":4.14,"surface_temperature_k":5653,"metallicity_fe_h_source":"Median of 8 spectroscopic determinations in 11 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":180.71,"proper_motion_dec_mas_yr":-331.27,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Gliese","designation":"Gl 857"},{"catalog":"HD","designation":"HD 212330"},{"catalog":"HIP","designation":"HIP 110649"},{"catalog":"HR","designation":"HR 8531"}],"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."}