204 Kallisto

204 Kallisto
	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°
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
Synodic rotation period	19.489 h (0.8120 d)
Geometric albedo	0.2082±0.010
Spectral type	S
Absolute magnitude (H)	8.89

Last updated August 04, 2025

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
1 2 "204 Kallisto". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 12 May 2016.
1 2 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.
1 2 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 viewer · Orbit parameters · Physical parameters

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

[jpldata-2] 1 2 "204 Kallisto". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 12 May 2016.

[Carry2012-3] 1 2 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.

[Pilcher2010-4] 1 2 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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