{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T18:19:09.177Z","years_from_j2000":26.676,"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-100451","name":"HIP 100451","class":"a5_white_star","category":"star","object_type":"A5 white star","mag":9.2,"mag_band":"V","abs_mag":4.992,"abs_mag_band":"V","distance_ly":226.49733956712618,"distance_method":"parallax","ra_deg":305.55555000000004,"dec_deg":16.372997,"epoch_ra_deg":305.863504,"epoch_dec_deg":16.458425,"epoch_moved_arcsec":0.064,"pm_ra_mas_yr":0.49,"pm_dec_mas_yr":2.33,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Delphinus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hip-100451","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20222+1623","age_years":965592600,"companions":[{"measured":2019,"magnitude":10.6,"components":"BC","discoverer_code":"STF2670","separation_arcsec":15.9,"position_angle_deg":77}],"mass_solar":1.905,"radius_solar":2.458,"spectral_type":"A5","color_index_bv":0.249,"luminosity_solar":0.8774047879567531,"variable_mag_max":9.14,"variable_mag_min":9.31,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1951BSD...C04....0S, quality E)","surface_gravity_log_g":3.899,"surface_temperature_k":7678,"proper_motion_ra_mas_yr":0.49,"proper_motion_dec_mas_yr":2.33,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4) — low confidence: above 7,500 K GSP-Phot's temperature and extinction are degenerate; Gaia's classifier calls the source a binary, which GSP-Phot fitted as one star","bolometric_luminosity_solar":18.9396},"designations":[{"catalog":"HIP","designation":"HIP 100451"}],"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."}