{"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":"2026-09-05T17:36:42.070Z","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":"hd-224990","name":"ζ Scl","class":"b5iv_blue_white_subgiant","category":"star","object_type":"B5IV blue-white subgiant","mag":5.04,"mag_band":"V","abs_mag":-0.899,"abs_mag_band":"V","distance_ly":502.5521837900452,"distance_method":"parallax","ra_deg":0.583005,"dec_deg":-29.720414,"epoch_ra_deg":0.927433,"epoch_dec_deg":-29.570753,"epoch_moved_arcsec":0.454,"pm_ra_mas_yr":9.66,"pm_dec_mas_yr":14,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Sculptor","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-224990","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00023-2943","companions":[{"measured":1927,"magnitude":13,"components":null,"discoverer_code":"B   631","separation_arcsec":3,"position_angle_deg":330}],"spectral_type":"B5IV","color_index_bv":-0.15,"luminosity_solar":199.34254564980927,"radial_velocity_km_s":8.6,"spectral_type_source":"SIMBAD (2020A&A...639A..81B, quality C)","surface_temperature_k":16100,"proper_motion_ra_mas_yr":9.66,"proper_motion_dec_mas_yr":14,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Zeta Scl"},{"catalog":"HD","designation":"HD 224990"},{"catalog":"HIP","designation":"HIP 183"},{"catalog":"HR","designation":"HR 9091"}],"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."}