 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° 13 33.398 / day |
| Inclination | 8.28673° |
| Longitude of ascending node | 205.123° |
| Argument of perihelion | 55.4125° |
| Physical characteristics | |
| Dimensions | 48.57±1.2 km 50.36 ± 1.69 km |
| Mass | (0.60 ± 1.81) × 10 kg |
| Synodic rotation period | 19.489 h (0.8120 d) |
| Geometric albedo | 0.2082±0.010 |
| 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 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.
References
- Noah Webster (1884) A Practical Dictionary of the English Language
- ^ "204 Kallisto". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
- ^ Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456. See Table 1.
- ^ Pilcher, Frederick (January 2010), "Rotational Period Determination for 23 Thalia, 204 Kallisto and 207 Hedda, and Notes on 161 Athor and 215", The Minor Planet Bulletin, 37 (1): 21−23, Bibcode:2010MPBu...37...21P.
External links
- The Asteroid Orbital Elements Database
- Minor Planet Discovery Circumstances
- Asteroid Light-curve Parameters
- Asteroid Albedo Compilation
- 204 Kallisto at AstDyS-2, Asteroids—Dynamic Site
- 204 Kallisto at the JPL Small-Body Database
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