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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-177756","name":"16 λ Aql","class":"b8_5v_blue_white_main_sequence_star","category":"star","object_type":"B8.5V blue-white main-sequence star","mag":3.43,"mag_band":"V","abs_mag":0.536,"abs_mag_band":"V","distance_ly":123.68469540136573,"distance_method":"parallax","ra_deg":286.56225,"dec_deg":-4.882554,"epoch_ra_deg":286.918519,"epoch_dec_deg":-4.842342,"epoch_moved_arcsec":2.467,"pm_ra_mas_yr":-19.68,"pm_dec_mas_yr":-90.37,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Aquila","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/hd-177756","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"19062-0453","companions":[{"measured":2010,"magnitude":16.8,"components":"A,Ca","discoverer_code":"JNN  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Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}