{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T21:06:35.944Z","years_from_j2000":26.67,"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":"hd-99333","name":"HD 99333","class":"m3iii_red_giant","category":"star","object_type":"M3III red giant","mag":5.87,"mag_band":"V","abs_mag":0.19,"abs_mag_band":"V","distance_ly":446.17833699635014,"distance_method":"parallax","ra_deg":171.38793,"dec_deg":-37.747575,"epoch_ra_deg":171.712745,"epoch_dec_deg":-37.895178,"epoch_moved_arcsec":1.153,"pm_ra_mas_yr":-41.69,"pm_dec_mas_yr":-11.45,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Centaurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-99333","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"11256-3745","companions":[{"measured":2016,"magnitude":11.5,"components":null,"discoverer_code":"B   796","separation_arcsec":5.2,"position_angle_deg":58}],"spectral_type":"M3III","color_index_bv":1.503,"luminosity_solar":73.11390834834172,"radial_velocity_km_s":7,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","proper_motion_ra_mas_yr":-41.69,"proper_motion_dec_mas_yr":-11.45},"designations":[{"catalog":"HD","designation":"HD 99333"},{"catalog":"HIP","designation":"HIP 55763"},{"catalog":"HR","designation":"HR 4411"}],"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."}