{"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":"2026-09-05T12:33:14.183Z","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-138800","name":"κ² Aps","class":"b7iii_iv_blue_white_giant","category":"star","object_type":"B7III/IV blue-white giant","mag":5.64,"mag_band":"V","abs_mag":-1.254,"abs_mag_band":"V","distance_ly":780.2782532923848,"distance_method":"parallax","ra_deg":235.08897000000002,"dec_deg":-73.446685,"epoch_ra_deg":235.844023,"epoch_dec_deg":-73.533494,"epoch_moved_arcsec":0.649,"pm_ra_mas_yr":-12.76,"pm_dec_mas_yr":-20.73,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Apus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-138800","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"15404-7327","companions":[{"measured":2016,"magnitude":13.5,"components":"AC","discoverer_code":"HDO 249","separation_arcsec":26.9,"position_angle_deg":3},{"measured":2016,"magnitude":12.94,"components":"AB","discoverer_code":"HDO 249","separation_arcsec":32.6,"position_angle_deg":130},{"measured":2016,"magnitude":10.8,"components":"AD","discoverer_code":"SKF2659","separation_arcsec":178.3,"position_angle_deg":267}],"spectral_type":"B7III/IV","color_index_bv":-0.04,"luminosity_solar":276.43943712203344,"radial_velocity_km_s":-19,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality D)","proper_motion_ra_mas_yr":-12.76,"proper_motion_dec_mas_yr":-20.73},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Kappa2 Aps"},{"catalog":"HD","designation":"HD 138800"},{"catalog":"HIP","designation":"HIP 76750"},{"catalog":"HR","designation":"HR 5782"}],"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."}