{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T07:31:55.585Z","years_from_j2000":26.674,"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-50880","name":"HIP 50880","class":"gwl_yellow_star","category":"star","object_type":"Gwl yellow star","mag":10.76,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":155.83986000000002,"dec_deg":-37.410949,"epoch_ra_deg":156.135222,"epoch_dec_deg":-37.546839,"epoch_moved_arcsec":1.634,"pm_ra_mas_yr":-50.76,"pm_dec_mas_yr":-34.27,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Antlia","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-50880","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":1784318200,"mass_solar":1.725,"radius_solar":3.401,"spectral_type":"Gwl","variable_mag_max":10.659,"variable_mag_min":10.839,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1972POAN....2...59S, quality E)","surface_gravity_log_g":3.504,"surface_temperature_k":5836,"proper_motion_ra_mas_yr":-50.76,"proper_motion_dec_mas_yr":-34.27,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":12.824},"designations":[{"catalog":"HIP","designation":"HIP 50880"}],"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."}