{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T19:00:48.397Z","years_from_j2000":26.665,"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":"misam","name":"Misam","class":"g9_5iiib_yellow_giant","category":"star","object_type":"G9.5IIIb yellow giant","mag":3.79,"mag_band":"V","abs_mag":1.097,"abs_mag_band":"V","distance_ly":112.73986583432497,"distance_method":"parallax","ra_deg":47.37387,"dec_deg":44.857544,"epoch_ra_deg":47.828104,"epoch_dec_deg":44.958982,"epoch_moved_arcsec":5.969,"pm_ra_mas_yr":173.01,"pm_dec_mas_yr":-142.05,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Perseus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/misam","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"03095+4451","companions":[{"measured":2009,"magnitude":13.5,"components":"AB","discoverer_code":"ES 2596","separation_arcsec":44.1,"position_angle_deg":319}],"spectral_type":"G9.5IIIb","uncertainties":{"metallicity_fe_h":[0.067,0.067]},"color_index_bv":0.98,"luminosity_solar":31.71027438947892,"metallicity_fe_h":0.08,"radial_velocity_km_s":29,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","surface_gravity_log_g":2.96,"surface_temperature_k":4933,"metallicity_fe_h_source":"Median of 10 spectroscopic determinations in 15 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":173.01,"proper_motion_dec_mas_yr":-142.05,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"27 Kappa Per"},{"catalog":"Common name","designation":"Misam"},{"catalog":"HD","designation":"HD 19476"},{"catalog":"HIP","designation":"HIP 14668"},{"catalog":"HR","designation":"HR 941"}],"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."}