1500 Jyväskylä ('), provisional designation , is a stony Florian
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.
...
from the inner regions of the
asteroid belt, approximately 7 kilometers in diameter. It was discovered on 16 October 1938, by Finnish astronomer
Yrjö Väisälä at the
Turku Observatory
Turku ( ; ; sv, Åbo, ) is a city and former capital on the southwest coast of Finland at the mouth of the Aura River, in the region of Finland Proper (''Varsinais-Suomi'') and the former Turku and Pori Province (''Turun ja Porin lääni''; ...
in Southwest Finland.
It was named for the Finnish town
Jyväskylä.
Classification and orbit
''Jyväskylä'' is a member of the
Flora family, a large collisional group of
stony asteroids. It orbits the Sun in the
inner
Interior may refer to:
Arts and media
* ''Interior'' (Degas) (also known as ''The Rape''), painting by Edgar Degas
* ''Interior'' (play), 1895 play by Belgian playwright Maurice Maeterlinck
* ''The Interior'' (novel), by Lisa See
* Interior de ...
main-belt at a distance of 1.8–2.7
AU once every 3 years and 4 months (1,227 days). Its orbit has an
eccentricity of 0.19 and an
inclination
Orbital inclination measures the tilt of an object's orbit around a celestial body. It is expressed as the angle between a Plane of reference, reference plane and the orbital plane or Axis of rotation, axis of direction of the orbiting object ...
of 7
° with respect to the
ecliptic.
The body's
observation arc
In observational astronomy, the observation arc (or arc length) of a Solar System body is the time period between its earliest and latest observations, used for tracing the body's path. It is usually given in days or years. The term is mostly use ...
begins at Turku, 3 weeks prior to its official discovery observation.
Physical characteristics
In 2016, a modeled
lightcurve was derived from data contained in the Lowell photometric database. Light-curve analysis gave it a
rotation period
The rotation period of a celestial object (e.g., star, gas giant, planet, moon, asteroid) may refer to its sidereal rotation period, i.e. the time that the object takes to complete a single revolution around its axis of rotation relative to the ...
of 8.8275 hours and a spin axis of (123°, −75.0°) in
ecliptic coordinates ().
According to the survey carried out by NASA's
Wide-field Infrared Survey Explorer
Wide-field Infrared Survey Explorer (WISE, observatory code C51, Explorer 92 and SMEX-6) is a NASA infrared astronomy space telescope in the Explorers Program. It was launched in December 2009, and placed in hibernation mode in February 2011, ...
with its subsequent
NEOWISE mission, the asteroid measures between 7.39 and 8.095 kilometers in diameter, and its surface has an
albedo
Albedo (; ) is the measure of the diffuse reflection of sunlight, solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body ...
between 0.161 and 0.31.
The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.24 – derived from
8 Flora
Flora (minor planet designation: 8 Flora) is a large, bright main-belt asteroid. It is the innermost ''large'' asteroid: no asteroid closer to the Sun has a diameter above 25 kilometres (20% that of Flora), and not until 20-km 149 Medusa was dis ...
, the largest member and namesake of this family – and calculates a diameter of 6.63 kilometers, using an
absolute magnitude
Absolute magnitude () is a measure of the luminosity of a celestial object on an inverse Logarithmic scale, logarithmic Magnitude (astronomy), astronomical magnitude scale. An object's absolute magnitude is defined to be equal to the apparent mag ...
of 13.06.
Naming
This
minor planet
According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet. Before 2006, the IAU officially used the term ''minor ...
was named for the Finnish town
Jyväskylä.
It is the largest city in the region of
Central Finland and on the
Finnish Lakeland
Finnish Lakeland or Finnish lake district ( fi, Järvi-Suomi, "Lake Finland", sv, Insjöfinland) is the largest of the four landscape regions into which the geography of Finland is divided.
The hilly, forest-covered landscape of the lake plate ...
. The official was published by the
Minor Planet Center
The Minor Planet Center (MPC) is the official body for observing and reporting on minor planets under the auspices of the International Astronomical Union (IAU). Founded in 1947, it operates at the Smithsonian Astrophysical Observatory.
Function
...
on 20 February 1976 ().
References
External links
Asteroid Lightcurve Database (LCDB) query form
)
Dictionary of Minor Planet Names Google books
– Observatoire de Genève, Raoul Behrend
– Minor Planet Center
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{{DEFAULTSORT:Jyvaskyla
001500
Discoveries by Yrjö Väisälä
Named minor planets
001500
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