Klymene (minor planet designation: 104 Klymene) is a large, dark Themistian asteroid that was discovered by J. C. Watson on September 13, 1868, and named after one of the many Clymenes in Greek mythology.[6] It is orbiting the Sun with a period of 5.60 years and an eccentricity of 0.16. The orbital plane is inclined by 2.8° to the plane of the ecliptic. It is classified as a C-type asteroid, indicating it probably has a carbonaceous composition. The spectra indicates the presence of aqueous-altered minerals on the surface[7] based upon a sharp feature at a wavelength of 3 μm, and, as of 2015, is the only member of the Themis family found to show this absorption.[8]
Discovery | |
---|---|
Discovered by | James Craig Watson |
Discovery date | 13 September 1868 |
Designations | |
(104) Klymene | |
Pronunciation | /ˈklɪmɪniː/[1] |
A868 RB, 1893 FA 1951 OE, 1968 OS[2] | |
Main belt | |
Orbital characteristics[3] | |
Epoch 31 July 2016 (JD 2457600.5) | |
Uncertainty parameter 0 | |
Observation arc | 130.58 yr (47693 d) |
Aphelion | 3.6499 AU (546.02 Gm) |
Perihelion | 2.65525 AU (397.220 Gm) |
3.15256 AU (471.616 Gm) | |
Eccentricity | 0.15775 |
5.60 yr (2044.5 d) | |
Average orbital speed | 16.67 km/s |
101.498° | |
0° 10m 33.888s / day | |
Inclination | 2.7905° |
41.698° | |
32.134° | |
Earth MOID | 1.66901 AU (249.680 Gm) |
Jupiter MOID | 1.63907 AU (245.201 Gm) |
TJupiter | 3.186 |
Physical characteristics | |
Dimensions | 163 km × 103 km (± 3 km × 5 km)[4] |
Mean diameter | 136.553±1.554 km[3] 133 km[4] |
Mass | (1.835 ± 0.880/0.495)×1018 kg[5] |
Mean density | 1.633 ± 0.783/0.441 g/cm3[5][a] |
Equatorial surface gravity | 0.0263 m/s2 |
Equatorial escape velocity | 0.0599 km/s |
8.984 h (0.3743 d)[3] | |
0.052±0.006[3] | |
Temperature | ~157 K |
C | |
8.58[3] | |
Based upon measurements made using adaptive optics at the W. M. Keck Observatory, this object may have a bi-lobed shape with a length of 163 ± 3 km and width of 103 ± 5 km, for an average dimension of 133 km.[4] This asteroid is located near the region of the Themis family but itself considered a background asteroid using HCM-analysis.[9] It is listed as a member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter.[10]
104 Klymene has been observed to occult 6 stars between 2009 and 2023.