{"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":"2026-09-03T16:02:55.377Z","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-340345","name":"HD 340345","class":"m1v_red_dwarf","category":"star","object_type":"M1V red dwarf","mag":9.69,"mag_band":"V","abs_mag":7.806,"abs_mag_band":"V","distance_ly":77.67479366599788,"distance_method":"parallax","ra_deg":307.544475,"dec_deg":26.84279,"epoch_ra_deg":307.826478,"epoch_dec_deg":26.931397,"epoch_moved_arcsec":5.575,"pm_ra_mas_yr":-163.45,"pm_dec_mas_yr":-130.3,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Vulpecula","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-340345","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"20302+2651","companions":[{"measured":2018,"magnitude":10.63,"components":"AB","discoverer_code":"WOR   9","separation_arcsec":0.6,"position_angle_deg":223},{"measured":2023,"magnitude":12.67,"components":"AC","discoverer_code":"BUP 213","separation_arcsec":9.9,"position_angle_deg":324},{"measured":2016,"magnitude":null,"components":"AG","discoverer_code":"BUP 213","separation_arcsec":9.9,"position_angle_deg":317},{"measured":2023,"magnitude":13.1,"components":"AF","discoverer_code":"LMP  45","separation_arcsec":42.4,"position_angle_deg":253},{"measured":2023,"magnitude":11,"components":"AD","discoverer_code":"BUP 213","separation_arcsec":92.2,"position_angle_deg":282}],"spectral_type":"M1V","color_index_bv":1.34,"luminosity_solar":0.06570523909635537,"variable_mag_max":9.638,"variable_mag_min":9.748,"radial_velocity_km_s":17.1,"spectral_type_source":"SIMBAD (1974ApJS...28....1J, quality C)","proper_motion_ra_mas_yr":-163.45,"proper_motion_dec_mas_yr":-130.3},"designations":[{"catalog":"HD","designation":"HD 340345"},{"catalog":"HIP","designation":"HIP 101150"}],"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."}