| • Science | • People | • Locations | • Timeline |
| Discovery | |||||||
|---|---|---|---|---|---|---|---|
| Discovered by | S. B. Nicholson | ||||||
| Discovered in | 1938 | ||||||
| Orbital characteristics | |||||||
| Mean radius | 11,720,000 km | ||||||
| Eccentricity | 0.081-0.155 | ||||||
| Orbital period | 259.2d | ||||||
| Inclination | 29° | ||||||
| Is a satellite of | Jupiter | ||||||
| Physical characteristics | |||||||
| Mean diameter | 36 km | ||||||
| Surface area | km2 | ||||||
| Mass | 7.77×1016 kg | ||||||
| Mean densityFor other meanings of density, see density (disambiguation Density (symbol: rho Greek: rho) is a measure of mass per unit of volume. The higher an object's density, the higher its mass per volume. The average density of an object equals its total mass div | 2.6 g/cm3 | ||||||
| Surface gravityThis article covers the physics of gravitation. See also gravity (disambiguation). Gravitation is the tendency of masses to move toward each other. The first mathematical formulation of the theory of gravitation was made by Sir Isaac Newton and proved ast | 0.0013 m/s2In physics, acceleration (symbol: a is defined as the rate of change (or time derivative) of velocity. It is thus a vector quantity with dimension length/ time˛. In SI units, this is metre/second˛. To accelerate an object is to change its velocity over a | ||||||
| Rotation period | ? | ||||||
| Axial tiltAxial tilt is an astronomical term regarding the inclination angle of a planet's rotation axis in relation to its orbital plane. It is also called obliquity . A planet whose rotation axis were perpendicular to the orbital plane would have an axial tilt of | ?° | ||||||
| AlbedoNote: This article discusses the physical or planetological property of albedo. For other usage, see Albedo (disambiguation). The albedo is a measure of reflectivity of a surface or body. It is the ratio of electromagnetic radiation reflected to the amoun | 0.04 | ||||||
| Surface temp.Temperature is the physical property of a system which underlies the common notions of "hot" and "cold"; the material with the higher temperature is said to be hotter. General description The formal properties of temperature are studied in thermodynamics. |
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| Atmospheric pressureAtmospheric pressure is the pressure caused by the weight of air above any area in the Earth's atmosphere. Standard atmospheric pressure atm is discussed in the next section. Air masses are affected by the general atmospheric pressure within the mass, cre | 0 kPa | ||||||
Lysithea (pronounced "ly SITH ee a") is a moon of Jupiter. It was discovered by Seth Barnes Nicholson in 1938 at Mount Wilson Observatory and is named after the mythological Lysithea , daughter of Oceanus and one of Zeus' lovers.
Lysithea did not receive its present name until 1975; before then, it was simply known as "Jupiter X".
It belongs to the Himalia group, five moons orbiting between 11 and 13 Gm from Jupiter at an inclination of about 27.5°.