204 Kallisto

204 Kallisto
Discovery
Discovered by	Johann Palisa
Discovery date	8 October 1879
Designations
MPC designation	(204) Kallisto
Pronunciation	/kəˈlɪstoʊ/[1]
Named after	Callisto
Minor planet category	Main belt
Adjectives	Kallistoan /kælɪˈstoʊən/
Orbital characteristics[2]
	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[2]; 50.36 ± 1.69 km[3]
Mass	(0.60 ± 1.81) × 1018 kg[3]
Rotation period	19.489 h (0.8120 d)[4]
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
"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, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. 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
- 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.