Hendrik C. van de Hulst

In this Dutch name, the surname is Van de Hulst, not Hulst.

In this article, Dutch capitalization is used for tussenvoegsels in Dutch family names. The first letter in Van de Hulst is capitalized unless it is preceded by a name, initial or title of nobility.

Hendrik Christoffel "Henk" van de Hulst (19 November 1918 – 31 July 2000) was a Dutch astronomer.

Hendrik C. van de Hulst
Hendrik C. van de Hulst in 1977
Born	(1918-11-19)19 November 1918 Utrecht, the Netherlands
Died	31 July 2000(2000-07-31) (aged 81) Leiden, the Netherlands
Known for	21 cm hyperfine line Anomalous diffraction theory
Awards	Henry Draper Medal (1955) Eddington Medal (1955) Rumford Medal (1964) Bruce Medal (1978) Karl Schwarzschild Medal (1995)
Scientific career
Fields	Astronomy
Institutions	University of Leiden
Thesis	Optics of spherical particles (1946)
Doctoral advisor	Marcel Minnaert[1]
Doctoral students	26,[2] including Johan Bleeker, Elly Dekker,[3] Harm Habing, Vincent Icke, Alexander Ollongren, Tim de Zeeuw

In 1944, while a student in Utrecht,^[4] he predicted the existence of the 21 cm hyperfine line of neutral interstellar hydrogen. After this line was discovered, he participated, with Jan Oort and Lex Muller, in the effort to use radio astronomy to map out the neutral hydrogen in our galaxy, which first revealed its spiral structure. Motivated by the scattering in cosmic dust, Van de Hulst studied light scattering by spherical particles and wrote his doctoral thesis on the topic,^[1] subsequently formulating the anomalous diffraction theory.^[5]

He spent most of his career at Leiden University, retiring in 1984. He published widely in astronomy, and dealt with the solar corona, and interstellar clouds. After 1960 he was a leader in international space research projects.^[6]

In 1956 he became member of the Royal Netherlands Academy of Arts and Sciences.^[7]

Books

• van de Hulst, H.C., Light Scattering by Small Particles, New York, (Wiley, 1957; Dover, 1981), ISBN 0-486-64228-3.^[8]
• van de Hulst, H.C., Multiple Light Scattering, New York, Academic Press, 1980, ISBN 978-0-12-710701-1.^[8]

Honors

Awards

• Henry Draper Medal of the National Academy of Sciences (1955)^[9]
• Eddington Medal of the Royal Astronomical Society (1955)
• Rumford Medal of the Royal Society (1964)
• Bruce Medal of the Astronomical Society of the Pacific (1978)^[10]
• Karl Schwarzschild Medal of the Astronomische Gesellschaft (1995)

Named after him

• Asteroid 2413 van de Hulst
• van de Hulst approximation

Honors

• elected to the American Philosophical Society (1960)^[11]
• elected to the American Academy of Arts and Sciences (1960)^[12]
• elected to the United States National Academy of Sciences (1977)^[13]

See also

• List of textbooks in electromagnetism