{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.671","julian_year":2026.671,"time":"2026-09-03T03:59:05.415Z","years_from_j2000":26.671,"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-81955","name":"HIP 81955","class":"f5_yellow_white_star","category":"star","object_type":"F5 yellow-white star","mag":10.53,"mag_band":"V","abs_mag":4.072,"abs_mag_band":"V","distance_ly":638.2707449036479,"distance_method":"parallax","ra_deg":251.135265,"dec_deg":-50.899575,"epoch_ra_deg":251.65278,"epoch_dec_deg":-50.949653,"epoch_moved_arcsec":0.769,"pm_ra_mas_yr":-8.34,"pm_dec_mas_yr":-27.6,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ara","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-81955","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16445-5054","age_years":2860955200,"companions":[{"measured":2000,"magnitude":15,"components":null,"discoverer_code":"SKF1037","separation_arcsec":2.8,"position_angle_deg":92}],"mass_solar":1.24,"radius_solar":1.413,"spectral_type":"F5","color_index_bv":0.462,"luminosity_solar":2.0473872763416394,"variable_mag_max":10.461,"variable_mag_min":10.591,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (2014yCat....1.2023S, quality E)","surface_gravity_log_g":4.201,"surface_temperature_k":6362,"proper_motion_ra_mas_yr":-8.34,"proper_motion_dec_mas_yr":-27.6,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":2.9833},"designations":[{"catalog":"HIP","designation":"HIP 81955"}],"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."}