Johannes Franz Hartmann

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.[2][3]

Johannes Franz Hartman
Johannes Franz Hartmann.jpg
Born(1865-01-11)January 11, 1865
DiedSeptember 13, 1936(1936-09-13) (aged 71)
Alma materUniversity of Leipzig
Known forDiscovering interstellar medium
Scientific career
InstitutionsAstrophysical Observatory Potsdam
Doctoral advisorHeinrich Bruns
Minor planets discovered: 3 [1]
965 Angelica November 4, 1921 MPC
1029 La Plata April 28, 1924 MPC
1254 Erfordia May 10, 1932 MPC

He was the director of the La Plata Astronomical Observatory, Argentina, from November 1922 to May 1934, and was also known under the name Juan Hartmann. He oriented the work of the observatory towards astrophysics and discovered the three asteroids of the main-belt, 965 Angelica, 1029 La Plata and 1254 Erfordia at La Plata between 1921 and 1932.[1]

His doctorate was from the University of Leipzig in 1891 on lunar eclipses.[4]

The lunar crater Hartmann on the far side of the Moon was named in his honor. Note, however, that the asteroid 3341 Hartmann was named after William K. Hartmann and is unrelated to him.[5]

See alsoEdit


  1. ^ a b "Minor Planet Discoverers (by number)". Minor Planet Center. 23 May 2016. Retrieved 3 June 2016.
  2. ^ Asimov, Asimov's Biographical Encyclopedia of Science and Technology 2nd Revised edition
  3. ^ 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.
  4. ^ Hockey, Thomas (2009). The Biographical Encyclopedia of Astronomers. Springer Publishing. ISBN 978-0-387-31022-0. Retrieved 22 August 2012.
  5. ^ Schmadel, Lutz D. (2007). "(3341) Hartmann". Dictionary of Minor Planet Names – (3341) Hartmann. Springer Berlin Heidelberg. p. 278. doi:10.1007/978-3-540-29925-7_3342. ISBN 978-3-540-00238-3.

External linksEdit