Named in honor of Henk C. van de Hulst {1918–2000}, husband of Wil van de Hulst (see 2412) and astrophysicist at the Leiden Observatory. A leader in the development of radioastronomy in the Netherlands, van de Hulst predicted the interstellar hydrogen 21cm line. He has made contributions to the theory of light scattering by small particles, about which topic he wrote two books. He is active in promoting international cooperation in space research. (M 11640) _ _.