204 Kallisto

204 Kallisto
Discovery
Discovered by	Johann Palisa
Discovery date	8 October 1879
Designations
MPC designation	(204) Kallisto
Pronunciation	/kəˈlɪstoʊ/
Named after	Callisto
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	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°
Argument of perihelion	55.4125°
Physical characteristics
Dimensions	48.57±1.2 km; 50.36 ± 1.69 km
Mass	(0.60 ± 1.81) × 1018 kg
Rotation period	19.489 h (0.8120 d)
Geometric albedo	0.2082±0.010
Spectral type	S
Absolute magnitude (H)	8.89

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.

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[]

^ Noah Webster (1884) A Practical Dictionary of the English Language
^ ^a ^b "204 Kallisto". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
^ ^a ^b Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
^ ^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.

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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
204 Kallisto at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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[1] Noah Webster (1884) A Practical Dictionary of the English Language

[jpldata-2] "204 Kallisto". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[Carry2012-3] Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.

[Pilcher2010-4] 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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