{"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":"2026-08-27T17:05:52.474Z","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":"denebola","name":"Denebola","class":"a3va_white_main_sequence_star","category":"star","object_type":"A3Va white main-sequence star","mag":2.14,"mag_band":"V","abs_mag":1.933,"abs_mag_band":"V","distance_ly":35.87687539246406,"distance_method":"parallax","ra_deg":177.26494499999998,"dec_deg":14.57206,"epoch_ra_deg":177.607398,"epoch_dec_deg":14.422027,"epoch_moved_arcsec":13.642,"pm_ra_mas_yr":-499.02,"pm_dec_mas_yr":-113.78,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/denebola","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11491+1434","companions":[{"measured":2021,"magnitude":15.7,"components":"AB","discoverer_code":"BU  604","separation_arcsec":39.1,"position_angle_deg":346},{"measured":2014,"magnitude":13.2,"components":"AC","discoverer_code":"BU  604","separation_arcsec":101.2,"position_angle_deg":25},{"measured":2022,"magnitude":8.49,"components":"AD","discoverer_code":"BU  604","separation_arcsec":235.8,"position_angle_deg":194}],"wikidata_id":"Q13015","also_known_as":["bet Leo","β Leo","β Leonis"],"spectral_type":"A3Va","color_index_bv":0.09,"luminosity_solar":14.682499678319866,"wikipedia_article":"Denebola","radial_velocity_km_s":-0.2,"spectral_type_source":"SIMBAD (2009ApJ...694.1085V, quality C)","proper_motion_ra_mas_yr":-499.02,"proper_motion_dec_mas_yr":-113.78},"designations":[{"catalog":"Bayer/Flamsteed","designation":"94 Beta Leo"},{"catalog":"Common name","designation":"Denebola"},{"catalog":"Gliese","designation":"GJ 448"},{"catalog":"Gliese","designation":"GJ 448.0"},{"catalog":"Gliese","designation":"Gl 448"},{"catalog":"HD","designation":"HD 102647"},{"catalog":"HIP","designation":"HIP 57632"},{"catalog":"HR","designation":"HR 4534"},{"catalog":"IRAS","designation":"IRAS 11464+1451"}],"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."}