{"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":"2026-09-02T14:22:49.609Z","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":"hip-75434","name":"HIP 75434","class":"b0_5ivn_blue_white_subgiant","category":"star","object_type":"B0.5IVn blue-white subgiant","mag":9.71,"mag_band":"V","abs_mag":1.93,"abs_mag_band":"V","distance_ly":1173.2242817252074,"distance_method":"parallax","ra_deg":231.169305,"dec_deg":-63.633838,"epoch_ra_deg":231.746702,"epoch_dec_deg":-63.728823,"epoch_moved_arcsec":0.205,"pm_ra_mas_yr":-4.45,"pm_dec_mas_yr":-6.27,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Triangulum Australe","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-75434","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"radius_solar":8.142,"spectral_type":"B0.5IVn","color_index_bv":0.184,"luminosity_solar":14.723125024327187,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1977ApJS...35..111G, quality C)","surface_gravity_log_g":3.535,"surface_temperature_k":19540,"proper_motion_ra_mas_yr":-4.45,"proper_motion_dec_mas_yr":-6.27,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate"},"designations":[{"catalog":"HIP","designation":"HIP 75434"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}