| Johannes Franz Hartman | |
|---|---|
| Born | January 11, 1865 Erfurt, Saxony |
| Died | September 13, 1936 (aged 71) Göttingen. |
| 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]
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.
| 965 Angelica | November 4, 1921 |
| 1029 La Plata | April 28, 1924 |
| 1254 Erfordia | May 10, 1932 |