{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.678","julian_year":2026.678,"time":"2026-09-05T17:17:28.317Z","years_from_j2000":26.678,"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-72641","name":"HIP 72641","class":"f2_yellow_white_star","category":"star","object_type":"F2 yellow-white star","mag":10.18,"mag_band":"V","abs_mag":1.781,"abs_mag_band":"V","distance_ly":1560.5568327411474,"distance_method":"parallax","ra_deg":222.780075,"dec_deg":-45.892941,"epoch_ra_deg":223.227791,"epoch_dec_deg":-46.003934,"epoch_moved_arcsec":0.448,"pm_ra_mas_yr":-13.64,"pm_dec_mas_yr":-9.79,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lupus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-72641","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"age_years":975674200,"mass_solar":1.734,"radius_solar":2.008,"spectral_type":"F2","color_index_bv":0.316,"luminosity_solar":16.88884694790917,"variable_mag_max":10.115,"variable_mag_min":10.235,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2014yCat....1.2023S, quality E)","surface_gravity_log_g":4.022,"surface_temperature_k":7304,"proper_motion_ra_mas_yr":-13.64,"proper_motion_dec_mas_yr":-9.79,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":11.8338},"designations":[{"catalog":"HIP","designation":"HIP 72641"}],"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."}