Sinope (moon)

Sinope
Central body	Jupiter
Properties of the orbit
Major semi-axis	23,939,000 km
Periapsis	17,966,000 km
Apoapsis	29,912,000 km
eccentricity	0.2495
Orbit inclination	158.109 °
Orbital time	758.9 d
Mean orbital velocity	2.29 km / s
Physical Properties
Albedo	0.04
Apparent brightness	18.1 mag
Medium diameter	38 km
Dimensions	~ 7.77 × 10 16 kg
surface	5000 km 2
Medium density	2.6 (?) G / cm 3
Acceleration of gravity on the surface	~ 0.014 m / s 2
Escape speed	~ 23.1 m / s
discovery
Explorer	SB Nicholson
Date of discovery	July 1, 1914

Sinope (also Jupiter IX) is one of the outermost known moons of the planet Jupiter .

discovery

Sinope was discovered on July 1, 1914 by the astronomer Seth Barnes Nicholson at the Lick Observatory .

The moon was named after Sinope , a nymph from Greek mythology who was courted by Zeus and kidnapped by Apollo .

It did not get its official name until 1975 , before it was simply referred to as Jupiter moon IX , since it was the ninth moon discovered near Jupiter.

Orbit data

Sinope orbits Jupiter at a mean distance of 23,939,000 km in 758 days, 21 hours and 36 minutes. The track has an eccentricity of 0.2495. With an inclination of 158.109 ° the orbit is retrograde, that is, the moon moves around the planet against the direction of rotation of Jupiter.

Sinope is attributed to the Pasiphae group due to its railway characteristics .

Physical data

Sinope has a mean diameter of about 38 km. Its density is estimated at 2.6 g / cm³. It is probably made up mainly of silicate rock. Sinope has a very dark surface with an albedo of 0.04, i.e. that is, only 4% of the incident sunlight is reflected. Its apparent brightness is 18.1 ^m .

Web links

• Seth B. Nicholson: "Discovery of the Ninth Satellite of Jupiter", in: Publications of the Astronomical Society of the Pacific , Vol. 26 (1914), No. 155, p. 197-198. (Discovery)
• IAUC 2846: Satellites of Jupiter October 7, 1975 (designation)

before	Jupiter moons	after that
Pasiphae	Sinope	Lysithea