(15963) Koeberl

Asteroid (15963) Koeberl
Properties of the orbit ( animation ) Epoch: April 27, 2019 ( JD 2,458,600.5)
Orbit type	Middle main belt asteroid
Asteroid family	Eunomia family
Major semi-axis	2.6779 AU
eccentricity	0.1756
Perihelion - aphelion	2.2078 AU - 3.1480 AU
Inclination of the orbit plane	13.2638 °
Length of the ascending node	150.8117 °
Argument of the periapsis	243.9823 °
Time of passage of the perihelion	15th October 2018
Sidereal period	4.38 a
Mean orbital velocity	18.12 km / s
Physical Properties
Medium diameter	8.590 (± 0.340) km
Albedo	0.166 (± 0.022)
Absolute brightness	13.1 mag
history
Explorer	Eric Walter Elst
Date of discovery	February 6, 1998
Another name	1998 CY ₃ , 1978 PH ₁ , 1987 RX ₂ , 1999 JL ₁₅
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(15963) Koeberl is an asteroid of the central main belt that was discovered on February 6, 1998 by the Belgian astronomer Eric Walter Elst at the La Silla Observatory of the European Southern Observatory in Chile ( IAU code 809). Unconfirmed sightings of the asteroid had already been made on August 8, 1978 (1978 PH ₁ ) and on September 1, 1987 (1987 RX ₂ ) at the Crimean observatory in Nautschnyj .

The asteroid belongs to the Eunomia family, a group named after (15) Eunomia , to which probably five percent of the asteroids in the main belt belong. The timeless (non- osculating ) orbital elements of (15963) Koeberl are almost identical to those of three smaller (assuming the absolute brightness of 15.0, 15.5 and 16.4 compared to 13.1) asteroids: (133581) 2003 UC ₅₅ , (139333) 2001 KD ₄₇ and (174371) 2002 UZ ₃₁ .

The mean diameter of the asteroid was calculated to be 8.590 (± 0.340) km , the albedo as 0.166 (± 0.022).

(15963) Koeberl was named on June 13, 2006 after the Austrian geochemist Christian Köberl .

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