204 Kallisto
Kallisto (minor planet designation: 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.
Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 8 October 1879 |
| Designations | |
MPC designation | (204) Kallisto |
| Pronunciation | /kəˈlɪstoʊ/ |
Named after | Callisto |
Alternative designations | A879 TA |
Minor planet category | 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) |
Semi-major axis | 2.66974 AU (399.387 Gm) |
| Eccentricity | 0.17504 |
Orbital period (sidereal) | 4.36 yr (1593.3 d) |
Average orbital speed | 18.22 km/s |
Mean anomaly | 230.567° |
Mean motion | 0° 13m 33.398s / day |
| Inclination | 8.28673° |
Longitude of ascending node | 205.123° |
| 55.4125° | |
| Physical characteristics | |
| Dimensions | 48.57±1.2 km 50.36 ± 1.69 km |
| Mass | (0.60 ± 1.81) × 1018 kg |
Synodic rotation period | 19.489 h (0.8120 d) |
| 0.2082±0.010 | |
| S | |
| 8.89 | |
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.
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