1778 Alfvén, also designated , is a carbonaceous Themistian
asteroid
An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the Solar System#Inner Solar System, inner Solar System or is co-orbital with Jupiter (Trojan asteroids). As ...
from the outer region of the
asteroid belt
The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies called asteroids ...
, approximately 20 kilometers in diameter.
It was discovered on 26 September 1960, by astronomers
Cornelis van Houten
Cornelis Johannes "Kees" van Houten (18 February 1920 – 24 August 2002) was a Dutch astronomer.
Early life and education
Born in The Hague, he spent his entire career at Leiden University except for a brief period (1954–1956) as a research a ...
,
Ingrid van Houten-Groeneveld
Ingrid van Houten-Groeneveld (; ; 21 October 1921 – 30 March 2015) was a Dutch astronomer.
Background
In a jointly credited trio with Tom Gehrels and her husband Cornelis Johannes van Houten, she was the discoverer of many thousands of as ...
and
Tom Gehrels
Anton M.J. "Tom" Gehrels (February 21, 1925 – July 11, 2011) was a Dutch–American astronomer, Professor of Planetary Sciences, and Astronomer at the University of Arizona, Tucson.
Biography
Youth and education
Gehrels was born at Ha ...
at the U.S.
Palomar Observatory
The Palomar Observatory is an astronomical research observatory in the Palomar Mountains of San Diego County, California, United States. It is owned and operated by the California Institute of Technology (Caltech). Research time at the observat ...
, in California. It was later named after Swedish Nobelist
Hannes Alfvén
Hannes Olof Gösta Alfvén (; 30 May 1908 – 2 April 1995) was a Swedish electrical engineer, plasma physicist and winner of the 1970 Nobel Prize in Physics for his work on magnetohydrodynamics (MHD). He described the class of MHD waves now ...
.
Orbit and classification
The dark
C-type asteroid
C-type (carbonaceous ) asteroids are the most common variety, forming around 75% of known asteroids. They are volatile-rich and distinguished by a very low albedo because their composition includes a large amount of carbon, in addition to rocks ...
is a member of the
Themis family
The Themis family (''adj. Themistian''; ) is a family of carbonaceous asteroids located in the outer portion of the asteroid belt, at a mean distance of 3.13 AU from the Sun. It is one of the largest families with over 4700 known members, and c ...
, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. ''Alfvén'' orbits the Sun in the