{"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":"2026-09-04T13:02:39.552Z","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-163029","name":"HD 163029","class":"k0v_k3v_orange_dwarf","category":"star","object_type":"K0V+K3V orange dwarf","mag":8.19,"mag_band":"V","abs_mag":5.185,"abs_mag_band":"V","distance_ly":130.15009327684473,"distance_method":"parallax","ra_deg":269.38187999999997,"dec_deg":-57.664222,"epoch_ra_deg":269.96292,"epoch_dec_deg":-57.668315,"epoch_moved_arcsec":3.722,"pm_ra_mas_yr":55.04,"pm_dec_mas_yr":-128.22,"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-163029","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"17575-5740","age_years":3946200100,"companions":[{"measured":2025,"magnitude":9.44,"components":"AB","discoverer_code":"HJ 4992","separation_arcsec":2.3,"position_angle_deg":50},{"measured":2015,"magnitude":13.87,"components":"AC","discoverer_code":"UC 3454","separation_arcsec":111.9,"position_angle_deg":351}],"mass_solar":0.916,"radius_solar":0.865,"spectral_type":"K0V+K3V","color_index_bv":0.74,"luminosity_solar":0.734513868157115,"radial_velocity_km_s":0,"spectral_type_source":"SIMBAD (1984ApJS...55..657C, quality C)","surface_gravity_log_g":4.468,"surface_temperature_k":5417,"proper_motion_ra_mas_yr":55.04,"proper_motion_dec_mas_yr":-128.22,"stellar_parameters_method":"Gaia DR3 model fit (GSP-Phot, FLAME; RUWE ≤ 1.4)","bolometric_luminosity_solar":0.5727},"designations":[{"catalog":"HD","designation":"HD 163029"},{"catalog":"HIP","designation":"HIP 87914"}],"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."}