HD 189733 b was the first extrasolar planet for which a thermal map was constructed, possibly to be detected through polarimetry, to have its overall color determined (deep blue), to have a transit detected in X-ray spectrum and to have carbon dioxide detected in its atmosphere.
HD 189733 foi o primeiro planeta extrasolar para o cal se creou un mapa termal, en ser detectado con polarimetría, en ter a súa cor xeral determinada (azul profundo), en ter o tránsito detectado polo espectro dos raios X e en ter detectado dióxido de carbono na súa atmosfera.