Johannes Franz Hartmann

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Johannes Franz Hartman
Johannes Franz Hartmann.jpg
Born (1865-01-11)January 11, 1865
Erfurt, Saxony
Died September 13, 1936(1936-09-13) (aged 71)
Citizenship German
Nationality German
Fields Mineralogist
Institutions Astrophysical Institute Potsdam
Alma mater University of Leipzig
Known for Discovering interstellar medium.

Johannes Franz Hartmann (January 11, 1865 – September 13, 1936) was a German physicist and astronomer. In 1904, while studying the spectroscopy of Delta Orionis he noticed that most of the spectrum had a shift, except the calcium lines, which he interpreted as indicating the presence of interstellar medium[1][2]

He was the director of the Observatorio Astronómico de La Plata from November 1922 to May 1934. He oriented the work of the observatory towards astrophysics. He discovered three asteroids.

Asteroids discovered: 3
965 Angelica November 4, 1921
1029 La Plata April 28, 1924
1254 Erfordia May 10, 1932

His doctorate was from the University of Leipzig in 1891 on lunar eclipses.[3]

See also[edit]


  1. ^ Asimov, Asimov's Biographical Encyclopedia of Science and Technology 2nd Revised edition
  2. ^ Hartmann, J. (1904). "Investigations on the spectrum and orbit of delta Orionis". Astrophysical Journal 19: 268–286. Bibcode:1904ApJ....19..268H. doi:10.1086/141112. 
  3. ^ Hockey, Thomas (2009). The Biographical Encyclopedia of Astronomers. Springer Publishing. ISBN 978-0-387-31022-0. Retrieved August 22, 2012. 

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