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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | October 8, 1879 |
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Designations
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| Named after | Callisto |
| Alternate name(s) | n/a |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 468.456 Gm (3.131 AU) |
| Perihelion | 331.062 Gm (2.213 AU) |
| Semi-major axis | 399.759 Gm (2.672 AU) |
| Eccentricity | 0.172 |
| Orbital period | 1595.51 d (4.37 a) |
| Average orbital speed | 18.22 km/s |
| Mean anomaly | 2.235° |
| Inclination | 8.272° |
| Longitude of ascending node | 205.217° |
| Argument of perihelion | 55.712° |
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Physical characteristics
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| Dimensions | 49.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 14.10 h |
| Albedo | 0.208 |
| Temperature | unknown |
| Spectral type | S |
| Absolute magnitude (H) | 8.89 |
204 Kallisto is a fairly typical, although sizeable Main belt asteroid. It is classified as an S-type asteroid. Like other asteroids of its type, it is light in colour.
It was discovered by Johann Palisa on October 8, 1879 in Pola.
The asteroid was named after the same nymph Callisto in Greek mythology as Jupiter's moon Callisto.
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