97 Klotho

Klotho (minor planet designation: 97 Klotho) is a fairly large main-belt asteroid. While it is an M-type, its radar albedo is too low to allow a nickel-iron composition. Klotho is similar to 21 Lutetia and 22 Kalliope in that all three are M-types of unknown composition. Klotho was found by Ernst Tempel on February 17, 1868. It was his fifth and final asteroid discovery. It is named after Klotho or Clotho, one of the three Moirai, or Fates, in Greek mythology.

97 Klotho

A three-dimensional model of 97 Klotho based on its light curve.
Discovery
Discovered by	Ernst Wilhelm Tempel
Discovery date	17 February 1868
Designations
MPC designation	(97) Klotho
Pronunciation	/ˈkloʊθoʊ/[1]
Named after	Clotho
Minor planet category	Main belt
Adjectives	Klothoian /kloʊˈθoʊ.iən/
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	145.72 yr (53224 d)
Aphelion	3.3534 AU (501.66 Gm)
Perihelion	1.99073 AU (297.809 Gm)
Semi-major axis	2.67206 AU (399.734 Gm)
Eccentricity	0.25498
Orbital period (sidereal)	4.37 yr (1595.4 d)
Average orbital speed	17.93 km/s
Mean anomaly	85.0170°
Mean motion	0° 13m 32.336s / day
Inclination	11.783°
Longitude of ascending node	159.705°
Argument of perihelion	268.687°
Physical characteristics
Dimensions	82.83±4.5 km[2] 84.79 ± 3.13 km[3]
Mass	(1.33 ± 0.13) × 1018 kg[3]
Mean density	4.16 ± 0.62 g/cm3[3]
Synodic rotation period	35.15 h (1.465 d)[2] 10.927 h[4]
Geometric albedo	0.2285±0.027[2] 0.229 [5]
Spectral type	M (Tholen) X (Bus) Xc (DeMeo et al)[6]
Absolute magnitude (H)	7.63

13-cm radar observations of this asteroid from the Arecibo Observatory between 1980 and 1985 were used to produce a diameter estimate of 108 km.^[7]

In 1990, the asteroid was observed for four nights from the Collurania-Teramo Observatory in Italy, producing an asymmetric light curve that showed a rotation period of 10.927 ± 0.001 hours and a brightness variation of 0.17 ± 0.02 in magnitude. This period confirms a value independently determined in 1971.^[4]