386 Siegena

386 Siegena is a very large main-belt asteroid. It is classified as a C-type asteroid and is probably composed of primitive carbonaceous material.

386 Siegena

A three-dimensional model of 386 Siegena based on its light curve
Discovery
Discovered by	Max Wolf
Discovery date	1 March 1894
Designations
MPC designation	(386) Siegena
Pronunciation	/ˈsiːɡənə/ SEE-gə-nə[1]
Named after	Siegen
Alternative designations	1894 AY
Minor planet category	Main belt
Adjectives	Siegenian /siːˈɡɛniən/ see-GHEN-ee-ən[2]
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	122.08 yr (44590 d)
Aphelion	3.38983 AU (507.111 Gm)
Perihelion	2.40159 AU (359.273 Gm)
Semi-major axis	2.89571 AU (433.192 Gm)
Eccentricity	0.17064
Orbital period (sidereal)	4.93 yr (1799.8 d)
Mean anomaly	66.7510°
Mean motion	0° 12m 0.068s / day
Inclination	20.2568°
Longitude of ascending node	166.886°
Argument of perihelion	219.478°
Physical characteristics
Dimensions	165.01±2.7 km[3] 170.35 ± 8.40 km[4]
Mass	(8.14 ± 1.58) × 1018 kg[4]
Mean density	3.14 ± 0.76 g/cm3[4]
Synodic rotation period	9.763 h (0.4068 d)
Geometric albedo	0.0692±0.002
Spectral type	C
Absolute magnitude (H)	7.43

It was discovered by Max Wolf on March 1, 1894, in Heidelberg.

During 1999, the asteroid was observed occulting a star. The resulting chords provided a diameter estimate of 174 km.^[5]