{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.683","julian_year":2026.683,"time":"2026-09-07T13:09:24.193Z","years_from_j2000":26.683,"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-152339","name":"HD 152339","class":"b9iii_blue_white_giant","category":"star","object_type":"B9III blue-white giant","mag":6.72,"mag_band":"V","abs_mag":-1.308,"abs_mag_band":"V","distance_ly":1315.1466632993604,"distance_method":"parallax","ra_deg":254.97798,"dec_deg":-73.422484,"epoch_ra_deg":255.8071,"epoch_dec_deg":-73.462524,"epoch_moved_arcsec":0.324,"pm_ra_mas_yr":-1.73,"pm_dec_mas_yr":-12,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Apus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-152339","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16599-7325","companions":[{"measured":2016,"magnitude":8.43,"components":null,"discoverer_code":"I   100","separation_arcsec":0.8,"position_angle_deg":174}],"spectral_type":"B9III","color_index_bv":-0.069,"luminosity_solar":290.53603143031484,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality C)","proper_motion_ra_mas_yr":-1.73,"proper_motion_dec_mas_yr":-12},"designations":[{"catalog":"HD","designation":"HD 152339"},{"catalog":"HIP","designation":"HIP 83173"}],"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."}