{"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":"2026-09-05T17:52:30.714Z","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-81346","name":"HIP 81346","class":"g0_yellow_star","category":"star","object_type":"G0 yellow star","mag":9.8,"mag_band":"V","abs_mag":3.355,"abs_mag_band":"V","distance_ly":634.5453867573673,"distance_method":"parallax","ra_deg":249.19911000000002,"dec_deg":-5.160304,"epoch_ra_deg":249.555886,"epoch_dec_deg":-5.215072,"epoch_moved_arcsec":0.178,"pm_ra_mas_yr":-3.08,"pm_dec_mas_yr":5.9,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-81346","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"16368-0510","age_years":620901200,"companions":[{"measured":2016,"magnitude":12.38,"components":null,"discoverer_code":"BU  819","separation_arcsec":1.5,"position_angle_deg":241}],"mass_solar":2.502,"radius_solar":7.57,"spectral_type":"G0","color_index_bv":0.711,"luminosity_solar":3.9627803425543933,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (quality D)","surface_gravity_log_g":2.877,"surface_temperature_k":5055,"proper_motion_ra_mas_yr":-3.08,"proper_motion_dec_mas_yr":5.9,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":34.7472},"designations":[{"catalog":"HIP","designation":"HIP 81346"}],"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."}