{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T17:42:54.823Z","years_from_j2000":26.654,"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":"mebsuta","name":"Mebsuta","class":"g8ib_yellow_supergiant","category":"star","object_type":"G8Ib yellow supergiant","mag":3.06,"mag_band":"V","abs_mag":-4.007,"abs_mag_band":"V","distance_ly":844.9648476849466,"distance_method":"parallax","ra_deg":100.98303,"dec_deg":25.131124,"epoch_ra_deg":101.395865,"epoch_dec_deg":25.104297,"epoch_moved_arcsec":0.376,"pm_ra_mas_yr":-5.93,"pm_dec_mas_yr":-12.81,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Gemini","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/mebsuta","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"06439+2508","companions":[{"measured":2017,"magnitude":9.64,"components":null,"discoverer_code":"S   533","separation_arcsec":109.9,"position_angle_deg":95}],"spectral_type":"G8Ib","color_index_bv":1.377,"luminosity_solar":3489.7956743787418,"radial_velocity_km_s":10,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","proper_motion_ra_mas_yr":-5.93,"proper_motion_dec_mas_yr":-12.81},"designations":[{"catalog":"Bayer/Flamsteed","designation":"27 Epsilon Gem"},{"catalog":"Common name","designation":"Mebsuta"},{"catalog":"HD","designation":"HD 48329"},{"catalog":"HIP","designation":"HIP 32246"},{"catalog":"HR","designation":"HR 2473"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T16:03:54.983Z","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."}