{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T17:54:42.665Z","years_from_j2000":26.667,"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-720","name":"κ² Scl","class":"k2iii_orange_giant","category":"star","object_type":"K2III orange giant","mag":5.41,"mag_band":"V","abs_mag":-1.521,"abs_mag_band":"V","distance_ly":793.5678210588312,"distance_method":"parallax","ra_deg":2.8934100000000003,"dec_deg":-27.799737,"epoch_ra_deg":3.234453,"epoch_dec_deg":-27.650236,"epoch_moved_arcsec":0.472,"pm_ra_mas_yr":4.61,"pm_dec_mas_yr":17.09,"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-720","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"00116-2748","companions":[{"measured":2010,"magnitude":21,"components":null,"discoverer_code":"LDS2099","separation_arcsec":44.2,"position_angle_deg":289}],"spectral_type":"K2III","color_index_bv":1.346,"luminosity_solar":353.50861336199705,"metallicity_fe_h":-0.12,"radial_velocity_km_s":-6,"spectral_type_source":"SIMBAD (1982MSS...C03....0H, quality C)","surface_gravity_log_g":2.02,"surface_temperature_k":4160,"metallicity_fe_h_source":"One spectroscopic determination, compiled from the literature (PASTEL, Soubiran+ 2016)","proper_motion_ra_mas_yr":4.61,"proper_motion_dec_mas_yr":17.09,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Kappa2 Scl"},{"catalog":"HD","designation":"HD 720"},{"catalog":"HIP","designation":"HIP 930"},{"catalog":"HR","designation":"HR 34"}],"source":{"id":"hyg","name":"HYG Database v4.1","url":"https://github.com/astronexus/HYG-Database","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}