Arete (
minor planet designation: 197 Arete) is an
asteroid in the
asteroid belt
The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, c ...
. It has a very bright surface, even so when compared to other rocky
S-type asteroid
S-type asteroids are asteroids with a spectral type that is indicative of a siliceous (i.e. stony) mineralogical composition, hence the name. They have relatively high density. Approximately 17% of asteroids are of this type, making it the secon ...
.
It was discovered by
J. Palisa on May 21, 1879, and named after
Arete
''Arete'' (Greek: ) is a concept in ancient Greek thought that, in its most basic sense, refers to 'excellence' of any kind Liddell, H.G. & Scott, R. ''A Greek–English Lexicon'', 9th ed. (Oxford, 1940), s.v.br>—especially a person or thi ...
, the mother of
Nausicaa in
Homer
Homer (; grc, Ὅμηρος , ''Hómēros'') (born ) was a Greek poet who is credited as the author of the ''Iliad'' and the ''Odyssey'', two epic poems that are foundational works of ancient Greek literature. Homer is considered one of the ...
's ''
The Odyssey
The ''Odyssey'' (; grc, Ὀδύσσεια, Odýsseia, ) is one of two major ancient Greek epic poems attributed to Homer. It is one of the oldest extant works of literature still widely read by modern audiences. As with the ''Iliad'', th ...
''.
Every 18 years, this asteroid approaches within 0.04 AU of
4 Vesta
Vesta ( minor-planet designation: 4 Vesta) is one of the largest objects in the asteroid belt, with a mean diameter of . It was discovered by the German astronomer Heinrich Wilhelm Matthias Olbers on 29 March 1807 and is named after Vesta, t ...
. During these encounters, Vesta causes a
gravitational perturbation
In astronomy, perturbation is the complex motion of a massive body subjected to forces other than the gravitational attraction of a single other massive body. The other forces can include a third (fourth, fifth, etc.) body, resistance, as from ...
of Arete, allowing the mass of Vesta to be directly determined.
[
Photometric observations during 1984 showed a rotation period of 6.54 ± 0.02 hours and a brightness variation of 0.10 ± 0.01 in ]magnitude
Magnitude may refer to:
Mathematics
*Euclidean vector, a quantity defined by both its magnitude and its direction
*Magnitude (mathematics), the relative size of an object
*Norm (mathematics), a term for the size or length of a vector
*Order of ...
. The light curve
In astronomy, a light curve is a graph of light intensity of a celestial object or region as a function of time, typically with the magnitude of light received on the y axis and with time on the x axis. The light is usually in a particular frequ ...
shows "four well defined extrema with two asymmetric maxima".
References
External links
*
*
Background asteroids
Arete
''Arete'' (Greek: ) is a concept in ancient Greek thought that, in its most basic sense, refers to 'excellence' of any kind Liddell, H.G. & Scott, R. ''A Greek–English Lexicon'', 9th ed. (Oxford, 1940), s.v.br>—especially a person or thi ...
Arete
''Arete'' (Greek: ) is a concept in ancient Greek thought that, in its most basic sense, refers to 'excellence' of any kind Liddell, H.G. & Scott, R. ''A Greek–English Lexicon'', 9th ed. (Oxford, 1940), s.v.br>—especially a person or thi ...
S-type asteroids (Tholen)
S-type asteroids (SMASS)
18790521
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