{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T13:10:08.894Z","years_from_j2000":26.664,"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":"grumium","name":"Grumium","class":"k2iii_orange_giant","category":"star","object_type":"K2III orange giant","mag":3.73,"mag_band":"V","abs_mag":1.04,"abs_mag_band":"V","distance_ly":112.54547663320578,"distance_method":"parallax","ra_deg":268.38201,"dec_deg":56.872643,"epoch_ra_deg":268.498428,"epoch_dec_deg":56.866835,"epoch_moved_arcsec":3.257,"pm_ra_mas_yr":93.65,"pm_dec_mas_yr":78.44,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Draco","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/grumium","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17535+5652","companions":[{"measured":2016,"magnitude":13.08,"components":null,"discoverer_code":"LDS1457","separation_arcsec":315.7,"position_angle_deg":290}],"spectral_type":"K2III","uncertainties":{"metallicity_fe_h":[0.097,0.097]},"color_index_bv":1.177,"luminosity_solar":33.419504002611426,"metallicity_fe_h":0.02,"radial_velocity_km_s":-26,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":2.56,"surface_temperature_k":4472,"metallicity_fe_h_source":"Median of 6 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":93.65,"proper_motion_dec_mas_yr":78.44,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"32 Xi Dra"},{"catalog":"Common name","designation":"Grumium"},{"catalog":"HD","designation":"HD 163588"},{"catalog":"HIP","designation":"HIP 87585"},{"catalog":"HR","designation":"HR 6688"}],"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."}