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.

204 Kallisto
Orbital diagram
Discovery
Discovered byJohann Palisa
Discovery date8 October 1879
Designations
(204) Kallisto
Pronunciation/kəˈlɪst/[1]
Named after
Callisto
A879 TA
Main belt
AdjectivesKallistoan /kælɪˈstən/
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc136.52 yr (49863 d)
Aphelion3.13704 AU (469.295 Gm)
Perihelion2.20244 AU (329.480 Gm)
2.66974 AU (399.387 Gm)
Eccentricity0.17504
4.36 yr (1593.3 d)
18.22 km/s
230.567°
0° 13m 33.398s / day
Inclination8.28673°
205.123°
55.4125°
Physical characteristics
Dimensions48.57±1.2 km[2]
50.36 ± 1.69 km[3]
Mass(0.60 ± 1.81) × 1018 kg[3]
19.489 h (0.8120 d)[4]
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.[4]

References

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  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b "204 Kallisto". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
  3. ^ a b 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.
  4. ^ a b 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.
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