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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":"corot-22","name":"CoRoT-22","class":"g3_v_yellow_star","category":"star","object_type":"G3 V yellow star","mag":13.82,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":2045.5158153607738,"distance_method":"NASA Exoplanet Archive sy_dist (TICv8, 2019AJ....158..138S)","ra_deg":280.6671392,"dec_deg":6.2191669,"epoch_ra_deg":280.995045,"epoch_dec_deg":6.244978,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Serpens","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/corot-22","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"wds_id":"18427+0613","companions":[{"measured":2015,"magnitude":19.6,"components":"AB","discoverer_code":"CRT  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