{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T05:16:00.827Z","years_from_j2000":26.68,"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":"guniibuu","name":"Guniibuu","class":"k2v_k1v_orange_dwarf","category":"star","object_type":"K2V+K1V orange dwarf","mag":4.33,"mag_band":"V","abs_mag":5.464,"abs_mag_band":"V","distance_ly":19.351836359067537,"distance_method":"parallax","ra_deg":258.83754,"dec_deg":-26.602829,"epoch_ra_deg":259.251197,"epoch_dec_deg":-26.641983,"epoch_moved_arcsec":33.033,"pm_ra_mas_yr":-473.69,"pm_dec_mas_yr":-1143.93,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/guniibuu","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17153-2636","age_years":6304093000,"companions":[{"measured":2016,"magnitude":7.8,"components":"BD","discoverer_code":"SHJ 243","separation_arcsec":295,"position_angle_deg":341}],"mass_solar":0.815,"radius_solar":0.768,"spectral_type":"K2V+K1V","color_index_bv":0.855,"luminosity_solar":0.5680675741067719,"radial_velocity_km_s":0.9,"spectral_type_source":"SIMBAD (2006A&A...460..695T, quality C)","surface_gravity_log_g":4.538,"surface_temperature_k":4997,"proper_motion_ra_mas_yr":-473.69,"proper_motion_dec_mas_yr":-1143.93,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.3344},"designations":[{"catalog":"Bayer/Flamsteed","designation":"36 Oph"},{"catalog":"Common name","designation":"Guniibuu"},{"catalog":"Gliese","designation":"Gl 663A"},{"catalog":"HD","designation":"HD 155885"},{"catalog":"HIP","designation":"HIP 84405"},{"catalog":"HR","designation":"HR 6401"}],"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."}