{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T14:38:52.660Z","years_from_j2000":26.675,"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-16560","name":"HD 16560","class":"g8iii_iv_yellow_giant","category":"star","object_type":"G8III/IV yellow giant","mag":8.46,"mag_band":"V","abs_mag":3.595,"abs_mag_band":"V","distance_ly":306.5380715970813,"distance_method":"parallax","ra_deg":39.82743,"dec_deg":-1.901001,"epoch_ra_deg":40.168987,"epoch_dec_deg":-1.785008,"epoch_moved_arcsec":1.761,"pm_ra_mas_yr":65.97,"pm_dec_mas_yr":-2.1,"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/hd-16560","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"02393-0154","companions":[{"measured":2020,"magnitude":10.45,"components":"AB","discoverer_code":"STF 290","separation_arcsec":10.1,"position_angle_deg":221},{"measured":2015,"magnitude":14.5,"components":"AC","discoverer_code":"STF 290","separation_arcsec":13.1,"position_angle_deg":154}],"spectral_type":"G8III/IV","color_index_bv":0.759,"luminosity_solar":3.1768740706497707,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1999MSS...C05....0H, quality D)","proper_motion_ra_mas_yr":65.97,"proper_motion_dec_mas_yr":-2.1},"designations":[{"catalog":"HD","designation":"HD 16560"},{"catalog":"HIP","designation":"HIP 12376"}],"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."}