{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T21:21:22.235Z","years_from_j2000":26.665,"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":"tarf","name":"Tarf","class":"k4iiiba0_5_orange_giant","category":"star","object_type":"K4IIIBa0.5: orange giant","mag":3.53,"mag_band":"V","abs_mag":-1.313,"abs_mag_band":"V","distance_ly":303.4014257125794,"distance_method":"parallax","ra_deg":124.12884000000001,"dec_deg":9.185545,"epoch_ra_deg":124.492543,"epoch_dec_deg":9.102856,"epoch_moved_arcsec":1.8,"pm_ra_mas_yr":-46.8,"pm_dec_mas_yr":-48.65,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Cancer","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/tarf","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"08165+0911","companions":[{"measured":2018,"magnitude":14.3,"components":"AB","discoverer_code":"BU 1065","separation_arcsec":29.4,"position_angle_deg":294},{"measured":2018,"magnitude":14.2,"components":"AC","discoverer_code":"DAL  42","separation_arcsec":70.2,"position_angle_deg":39}],"spectral_type":"K4IIIBa0.5:","color_index_bv":1.481,"luminosity_solar":291.87708481971424,"radial_velocity_km_s":22,"spectral_type_source":"SIMBAD (1989ApJS...71..245K, quality C)","proper_motion_ra_mas_yr":-46.8,"proper_motion_dec_mas_yr":-48.65},"designations":[{"catalog":"Bayer/Flamsteed","designation":"17 Beta Cnc"},{"catalog":"Common name","designation":"Tarf"},{"catalog":"Exoplanet host","designation":"β Cnc"},{"catalog":"HD","designation":"HD 69267"},{"catalog":"HIP","designation":"HIP 40526"},{"catalog":"HR","designation":"HR 3249"}],"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."}