204 Kallisto
Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 8 October 1879 |
| Designations | |
| (204) Kallisto | |
| Pronunciation | /kəˈlɪstoʊ/ |
Named after | Callisto |
| A879 TA | |
| Main belt | |
| Adjectives | Kallistoan /kælɪˈstoʊən/ |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 136.52 yr (49863 d) |
| Aphelion | 3.13704 AU (469.295 Gm) |
| Perihelion | 2.20244 AU (329.480 Gm) |
| 2.66974 AU (399.387 Gm) | |
| Eccentricity | 0.17504 |
| 4.36 yr (1593.3 d) | |
Average orbital speed | 18.22 km/s |
| 230.567° | |
| 0° 13m 33.398s / day | |
| Inclination | 8.28673° |
| 205.123° | |
| 55.4125° | |
| Physical characteristics | |
| Dimensions | 48.57±1.2 km 50.36 ± 1.69 km |
| Mass | (0.60 ± 1.81) × 1018 kg |
| 19.489 h (0.8120 d) | |
| 0.2082±0.010 | |
| S | |
| 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 8 October 1879, in Pola, and was named after the same nymph Callisto in Greek mythology as Jupiter's moon Callisto.
Photometric measurements during 2009 produced a lightcurve that indicated a sidereal rotation period of 19.489±0.002 h with a variation amplitude of 0.18±0.02 magnitudes. This result conflicted with previous determinations of the period, so the latter were ruled out.