Johannes Franz Hartmann on:
[Wikipedia]
[Google]
[Amazon]
Johannes Franz Hartmann (11 January 1865 – 13 September 1936) was a German 
Lista de cientificos
1865 births 1936 deaths 19th-century German astronomers Discoverers of asteroids * 20th-century German physicists 20th-century German astronomers German expatriates in Argentina 19th-century German physicists {{Germany-astronomer-stub
physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe.
Physicists generally are interested in the root or ultimate ca ...
and astronomer
An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either o ...
. In 1904, while studying the spectroscopy of Delta Orionis
Mintaka , designation Delta Orionis (δ Orionis, abbreviated Delta Ori, δ Ori) and 34 Orionis (34 Ori), is a multiple star system some 1,200 light-years from the Sun in the constellation of Orion. Together with Alnitak (Zeta O ...
he noticed that most of the spectrum had a shift, except the calcium
Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar t ...
lines, which he interpreted as indicating the presence of interstellar medium. Asimov, '' Asimov's Biographical Encyclopedia of Science and Technology'' 2nd Revised edition
He was the director of the La Plata Astronomical Observatory
The La Plata Astronomical Observatory ( es, Observatorio Astronómico de La Plata) is an observatory located in the city of La Plata, capital of the province of Buenos Aires, Argentina. Its IAU code is 839.
History
La Plata was a planned ci ...
, 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
Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. As one of the founders of the discipline said, Astrophysics "seeks to ascertain the nature of the he ...
and discovered the three asteroid
An asteroid is a minor planet of the Solar System#Inner solar system, inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic o ...
s of the main-belt, 965 Angelica
965 Angelica ('' prov. designation:'' ''or'' ), is a large background asteroid from the outer regions of the asteroid belt, approximately in diameter. It was discovered on 4 November 1921, by astronomer Johannes F. Hartmann at the La Plata A ...
, 1029 La Plata
1029 La Plata, provisional designation , is a stony Koronis asteroid from the outer regions of the asteroid belt, approximately in diameter. It was discovered on 28 April 1924, by German astronomer Johannes Hartmann at the La Plata Astronomical ...
and 1254 Erfordia
1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of ''unit length'' is a line segment of length ...
at La Plata between 1921 and 1932.
His doctorate was from the University of Leipzig
Leipzig University (german: Universität Leipzig), in Leipzig in Saxony, Germany, is one of the world's oldest universities and the second-oldest university (by consecutive years of existence) in Germany. The university was founded on 2 Decemb ...
in 1891 on lunar eclipses.
The lunar crater ''Hartmann Hartmann is a Germanic and Ashkenazi Jewish surname. It is less frequently used as a male given name. The name originates from the Germanic word, "hart", which translates in English to "hardy", "hard", or "tough" and "Mann", a suffix meaning "man", ...
'' 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.
See also
* Hartman mask, a tool to help focusing telescopeReferences
External links
*Lista de cientificos
1865 births 1936 deaths 19th-century German astronomers Discoverers of asteroids * 20th-century German physicists 20th-century German astronomers German expatriates in Argentina 19th-century German physicists {{Germany-astronomer-stub