Encyclopedia of the Solar System 2nd ed

TABLE

4

Physical and Orbital Properties of the Satellites of the Planets and Dwarf Planets

Semimajor

Orbital

Orbital Inclination

Orbital Period

Mean Radius

Density

Year of

Discovered

Name

Axis 10

3

km

Eccentricity

degrees

days

Km

Mass (10

23

g)

g cm

−^3

Discovery

By

U26 Mab

97.74

0.0025

0.13

—

6

—

—

2003

Showalter and Lissauer

U27Cupid

74.39

0.0

—

—

8

—

—

2003

Showalter and Lissauer

NeptuneN3 Naiad

48.23

0.0004

4.746

0.294

33

—

—

1989

Voyager 2

N4 Thalassa

50.08

0.0002

0.209

0.311

41

—

—

1989

Voyager 2

N5 Despina

52.53

0.0002

0.064

0.335

75

—

—

1989

Voyager 2

N6 Galatea

61.95

0.0000

0.062

0.429

88

—

—

1989

Voyager 2

N7 Larissa

73.55

0.0014

0.205

0.555

97

—

—

1989

Voyager 2

N8 Proteus

117.65

0.0005

0.026

1.122

210

—

—

1989

Voyager 2

N1 Triton

354.8

0.0000

156.834

5.877

1,353.4

214.0

2.061

1846

Lassell

N2 Nereid

5,513.4

0.7512

7.232

360.14

170

—

—

1949

Kuiper

S/2002 N1

15,728.

0.5711

134.10

1879.71

31

—

—

2002

Holman et al.

S/2002 N2

22,422.

0.2931

48.51

2914.07

22

—

—

2002

Holman et al.

S/2002 N3

23,571.

0.4237

34.74

3167.85

21

—

—

2002

Holman et al.

S/2003 N1

46,695.

0.4499

137.39

9115.91

30

—

—

2003

Jewitt et al.

S/2002 N4

48,387.

0.4945

132.58

9373.99

20

—

—

2002

Holman et al.

PlutoP1 Charon

19.40

0.0076

96.16

6.3872

593

16.

1.8

1978

Christy

P2 Nix

48.68

0.0

96.

25.4

40–65

—

—

2005

Weaver et al.

P3 Hydra

64.78

0.0

96.

39.0

30–55

—

—

2005

Weaver et al.

ErisDysnomia

33.

—

—

∼

14

.

200

—

—

2005

Brown et al.

916