| Minorplanet: | yes |
| Background: |
|
| 104 Klymene | |
| Discoverer: | James Craig Watson |
| Discovered: | 13 September 1868 |
| Mpc Name: | (104) Klymene |
| Alt Names: | A868 RB, 1893 FA 1951 OE, 1968 OS |
| Pronounced: | [1] |
| Mp Category: | Main belt |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 3.15256AU |
| Perihelion: | 2.65525AU |
| Aphelion: | 3.6499abbr=onNaNabbr=on |
| Eccentricity: | 0.15775 |
| Period: | 5.60 yr (2044.5 d) |
| Inclination: | 2.7905° |
| Asc Node: | 41.698° |
| Arg Peri: | 32.134° |
| Mean Anomaly: | 101.498° |
| Avg Speed: | 16.67 km/s |
| Dimensions: | (±) |
| Mean Diameter: | 133 km |
| Mass: | (1.835 ± 0.880/0.495) kg |
| Density: | 1.633 ± 0.783/0.441 g/cm3 |
| Surface Grav: | m/s |
| Escape Velocity: | km/s |
| Rotation: | 8.984abbr=onNaNabbr=on |
| Spectral Type: | C |
| Abs Magnitude: | 8.58 |
| Single Temperature: | ~157 K |
| Mean Motion: | / day |
| Observation Arc: | 130.58 yr (47693 d) |
| Uncertainty: | 0 |
| Moid: | 1.66901AU |
| Jupiter Moid: | 1.63907AU |
| Tisserand: | 3.186 |
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. 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 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.
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. This asteroid is located near the region of the Themis family but itself considered a background asteroid using HCM-analysis. It is listed as a member of the Hecuba group of asteroids that orbit near the 2:1 mean-motion resonance with Jupiter.
104 Klymene has been observed to occult 6 stars between 2009 and 2023.