158 Koronis

Orbital characteristics [ftp://ftp.lowell.edu/pub/elgb/astorb.html 1]
Orbit Orbit In physics, an orbit is the gravitationally curved path of an object around a point in space, for example the orbit of a planet around the center of a star system, such as the Solar System...  type	Main belt Asteroid belt The asteroid belt is the region of the Solar System located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets...  (Koronis Koronis family ]The Koronis family is a family of asteroids in the main belt between Mars and Jupiter. They are thought to have been formed at least two billion years ago in a catastrophic collision between two larger bodies. The largest known is about in diameter. The Koronis family travels in a cluster along... )
Semimajor axis	2.867 AU Astronomical unit An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....
Perihelion distance	2.705 AU Astronomical unit An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....
Aphelion distance	3.030 AU Astronomical unit An astronomical unit is a unit of length equal to about or approximately the mean Earth–Sun distance....
Orbital period Orbital period The orbital period is the time taken for a given object to make one complete orbit about another object.When mentioned without further qualification in astronomy this refers to the sidereal period of an astronomical object, which is calculated with respect to the stars.There are several kinds of...	4.86 years
Inclination Inclination Inclination in general is the angle between a reference plane and another plane or axis of direction.-Orbits:The inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit...	1.00°
Eccentricity	0.057
Physical characteristics [ftp://ftp.lowell.edu/pub/elgb/astorb.html 1]
Diameter Diameter In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle...	35.4 km
Rotation period Rotation period The rotation period of an astronomical object is the time it takes to complete one revolution around its axis of rotation relative to the background stars...	14.218 hours
Spectral class	S S-type asteroid S-type asteroids are of a stony composition, hence the name. Approximately 17% of asteroids are of this type, making it the second most common after the C-type.-Characteristics:...
Abs. magnitude Absolute magnitude Absolute magnitude is the measure of a celestial object's intrinsic brightness. it is also the apparent magnitude a star would have if it were 32.6 light years away from Earth...	9.27
Albedo Albedo Albedo , or reflection coefficient, is the diffuse reflectivity or reflecting power of a surface. It is defined as the ratio of reflected radiation from the surface to incident radiation upon it...  4	0.277
History 2
Discoverer	V. Knorre Viktor Knorre Viktor Knorre was a Russian astronomer of German ethnic origin.-Biography and family background:Viktor Knorre was born into a three-generation astronomer family... , 1876

158 Koronis kəˈroʊnɨs is a main-belt

Asteroid belt

The asteroid belt is the region of the Solar System located roughly between the orbits of the planets Mars and Jupiter. It is occupied by numerous irregularly shaped bodies called asteroids or minor planets...

, S-type asteroid

S-type asteroid

S-type asteroids are of a stony composition, hence the name. Approximately 17% of asteroids are of this type, making it the second most common after the C-type.-Characteristics:...

.

It was discovered by Viktor Knorre

Viktor Knorre

Viktor Knorre was a Russian astronomer of German ethnic origin.-Biography and family background:Viktor Knorre was born into a three-generation astronomer family...

 on January 4, 1876, from the Berlin observatory

Observatory

An observatory is a location used for observing terrestrial or celestial events. Astronomy, climatology/meteorology, geology, oceanography and volcanology are examples of disciplines for which observatories have been constructed...

. It was the first of his four asteroid discoveries.

The asteroid itself may not be spectacular, but the Koronidian family of asteroids

Koronis family

]The Koronis family is a family of asteroids in the main belt between Mars and Jupiter. They are thought to have been formed at least two billion years ago in a catastrophic collision between two larger bodies. The largest known is about in diameter. The Koronis family travels in a cluster along...

 named after it is one of the most important. One member of the family, 243 Ida

243 Ida

243 Ida is an asteroid in the Koronis family of the asteroid belt. It was discovered on 29 September 1884 by Johann Palisa and named after a nymph from Greek mythology. Later telescopic observations categorized Ida as an S-type asteroid, the most numerous type in the inner asteroid belt. On 28...

, has been visited by spacecraft

Spacecraft

A spacecraft or spaceship is a craft or machine designed for spaceflight. Spacecraft are used for a variety of purposes, including communications, earth observation, meteorology, navigation, planetary exploration and transportation of humans and cargo....

, and gives some idea of how the other asteroids in the family may look.

Based on a model constructed from the lightcurve, the shape of Koronis resembles that of Ida, although it is a bit larger. http://www.astro.helsinki.fi/~kaselain/asteroids.html