{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T13:30:55.324Z","years_from_j2000":26.681,"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":"baten-kaitos","name":"Baten Kaitos","class":"k0_5iii_orange_giant","category":"star","object_type":"K0.5III orange giant","mag":3.74,"mag_band":"V","abs_mag":-0.548,"abs_mag_band":"V","distance_ly":234.98295004618265,"distance_method":"parallax","ra_deg":27.86514,"dec_deg":-10.335038,"epoch_ra_deg":28.197275,"epoch_dec_deg":-10.202228,"epoch_moved_arcsec":1.449,"pm_ra_mas_yr":38.78,"pm_dec_mas_yr":-38.04,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/baten-kaitos","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"01515-1020","companions":[{"measured":1979,"magnitude":null,"components":"Aa,Ab","discoverer_code":"BNU   1","separation_arcsec":0.1,"position_angle_deg":172},{"measured":2011,"magnitude":10.15,"components":"AB","discoverer_code":"BUP  26","separation_arcsec":188.6,"position_angle_deg":40}],"spectral_type":"K0.5III","uncertainties":{"metallicity_fe_h":[0.04,0.04]},"color_index_bv":1.136,"luminosity_solar":144.27796231294775,"metallicity_fe_h":-0.09,"radial_velocity_km_s":9,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality B)","surface_gravity_log_g":2.3,"surface_temperature_k":4600,"metallicity_fe_h_source":"Median of 2 spectroscopic determinations in 3 papers, compiled from the literature (PASTEL, Soubiran+ 2016); the error bar is the scatter between them","proper_motion_ra_mas_yr":38.78,"proper_motion_dec_mas_yr":-38.04,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"55 Zeta Cet"},{"catalog":"Common name","designation":"Baten Kaitos"},{"catalog":"HD","designation":"HD 11353"},{"catalog":"HIP","designation":"HIP 8645"},{"catalog":"HR","designation":"HR 539"}],"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."}