{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.672","julian_year":2026.672,"time":"2026-09-03T13:56:56.894Z","years_from_j2000":26.672,"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-136504","name":"ε Lup","class":"b3iv_b3_v_blue_white_subgiant","category":"star","object_type":"B3IV+B3:V blue-white subgiant","mag":3.37,"mag_band":"V","abs_mag":-2.609,"abs_mag_band":"V","distance_ly":512.019524966029,"distance_method":"parallax","ra_deg":230.67031500000002,"dec_deg":-44.689622,"epoch_ra_deg":231.127677,"epoch_dec_deg":-44.785836,"epoch_moved_arcsec":0.762,"pm_ra_mas_yr":-20.25,"pm_dec_mas_yr":-20.13,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Lupus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-136504","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"15227-4441","companions":[{"measured":2010,"magnitude":5.1,"components":"Aa,Ab","discoverer_code":"RIZ  13","separation_arcsec":0.1,"position_angle_deg":25},{"measured":2024,"magnitude":5.04,"components":"AB","discoverer_code":"COP   2","separation_arcsec":0.2,"position_angle_deg":357},{"measured":2020,"magnitude":9.1,"components":"AC","discoverer_code":"DUN 182","separation_arcsec":26.2,"position_angle_deg":168},{"measured":2016,"magnitude":16.2,"components":"AD","discoverer_code":"RIZ  13","separation_arcsec":38.9,"position_angle_deg":190}],"spectral_type":"B3IV+B3:V","color_index_bv":-0.191,"luminosity_solar":962.941712971556,"radial_velocity_km_s":8,"spectral_type_source":"SIMBAD (1970MNRAS.149...75T, quality C)","surface_temperature_k":23410,"proper_motion_ra_mas_yr":-20.25,"proper_motion_dec_mas_yr":-20.13,"stellar_parameters_method":"Spectroscopic determinations compiled from the literature (PASTEL, Soubiran+ 2016)"},"designations":[{"catalog":"Bayer/Flamsteed","designation":"Epsilon Lup"},{"catalog":"HD","designation":"HD 136504"},{"catalog":"HIP","designation":"HIP 75264"},{"catalog":"HR","designation":"HR 5708"}],"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."}