Edvard Hugo von Zeipel (8 February 1873 – 8 June 1959) was a
Swedish
Swedish or ' may refer to:
Anything from or related to Sweden, a country in Northern Europe. Or, specifically:
* Swedish language, a North Germanic language spoken primarily in Sweden and Finland
** Swedish alphabet, the official alphabet used by ...
astronomer, with the specialist fields of study of
celestial mechanics,
astrophotography, and
theoretical astrophysics. He worked at the
Stockholm Observatory from 1897 to 1900, participated in scientific expeditions to
Spitzbergen
Svalbard ( , ), also known as Spitsbergen, or Spitzbergen, is a Norwegian archipelago in the Arctic Ocean. North of mainland Europe, it is about midway between the northern coast of Norway and the North Pole. The islands of the group range ...
in 1898, 1901, and 1902, then worked at the
Pulkovo Observatory from 1901 to 1902, the
Paris observatory
The Paris Observatory (french: Observatoire de Paris ), a research institution of the Paris Sciences et Lettres University, is the foremost astronomical observatory of France, and one of the largest astronomical centers in the world. Its histor ...
from 1904 to 1906, and the
Uppsala Astronomical Observatory from 1911. He proved a key theorem about the
Painlevé conjecture
In physics, the Painlevé conjecture is a theorem about singularities among the solutions to the ''n''-body problem: there are noncollision singularities for ''n'' ≥ 4.
The theorem was proven for ''n'' ≥ 5 in 1988 ...
.
Von Zeipel specialized in 'celestial mechanics, especially distribution of stars and globular star clusters, asteroid motions, and problems of radiation equilibrium. "
In 1930, von Zeipel was awarded the
A. Cressy Morrison Prize from the
New York Academy of Sciences for his theory that "the stars like the Sun were recurrent novae."
Named after von Zeipel
*The crater
Von Zeipel on the
Moon is named after him.
*
8870 von Zeipel
__NOTOC__
Year 887 ( DCCCLXXXVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.
Events
By place
Europe
* November 17 – East Frankish magnates revolt against the inept emperor ...
is an
asteroid
An asteroid is a minor planet of the 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 or icy bodies with no atmosphere.
...
discovered on March 6, 1992. It is also named after him.
*
Von Zeipel theorem, linking stellar
radiative flux
Radiative flux, also known as radiative flux density or radiation flux (or sometimes power flux density), is the amount of Power (physics), power radiated through a given area, in the form of photons or other elementary particles, typically measure ...
to local effective gravity.
References
External links
Hugo von Zeipel
in ''Nordisk familjebok, 33 (1922), col. 711. (in Swedish)
1873 births
1959 deaths
People from Haninge Municipality
20th-century Swedish astronomers
19th-century Swedish astronomers
Members of the Royal Society of Sciences in Uppsala
{{Europe-astronomer-stub