{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T18:18:00.553Z","years_from_j2000":26.673,"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-170286","name":"HD 170286","class":"k2iii_ivcnii_orange_giant","category":"star","object_type":"K2III/IVCNII orange giant","mag":7.72,"mag_band":"V","abs_mag":1.798,"abs_mag_band":"V","distance_ly":498.71006166054195,"distance_method":"parallax","ra_deg":278.76237,"dec_deg":-71.324075,"epoch_ra_deg":279.543432,"epoch_dec_deg":-71.303027,"epoch_moved_arcsec":1.764,"pm_ra_mas_yr":-20.21,"pm_dec_mas_yr":-62.99,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pavo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-170286","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18350-7119","companions":[{"measured":2015,"magnitude":14.4,"components":"AB","discoverer_code":"UC 3619","separation_arcsec":28.1,"position_angle_deg":246},{"measured":2015,"magnitude":15.8,"components":"AC","discoverer_code":"UC 3619","separation_arcsec":36,"position_angle_deg":243}],"spectral_type":"K2III/IVCNII","color_index_bv":1.191,"luminosity_solar":16.62646796893536,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1975MSS...C01....0H, quality D)","proper_motion_ra_mas_yr":-20.21,"proper_motion_dec_mas_yr":-62.99},"designations":[{"catalog":"HD","designation":"HD 170286"},{"catalog":"HIP","designation":"HIP 91107"}],"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."}