{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-07T03:06:13.298Z","years_from_j2000":26.682,"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-3163","name":"HIP 3163","class":"a3_white_star","category":"star","object_type":"A3 white star","mag":9.56,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":10.080345000000001,"dec_deg":24.049742,"epoch_ra_deg":10.435823,"epoch_dec_deg":24.197332,"epoch_moved_arcsec":1.067,"pm_ra_mas_yr":39.98,"pm_dec_mas_yr":-0.04,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Andromeda","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-3163","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00403+2403","age_years":1615446600,"companions":[{"measured":2015,"magnitude":11.13,"components":"BC","discoverer_code":"BU 1348","separation_arcsec":33,"position_angle_deg":247}],"mass_solar":1.482,"radius_solar":1.768,"spectral_type":"A3","color_index_bv":0.34,"radial_velocity_km_s":0,"surface_gravity_log_g":4.042,"surface_temperature_k":6864,"proper_motion_ra_mas_yr":39.98,"proper_motion_dec_mas_yr":-0.04,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":6.2871},"designations":[{"catalog":"HIP","designation":"HIP 3163"}],"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."}