Metis

Metis is a small and irregularly shaped moon named after a Titaness who was a consort of Jupiter. Metis and Jupiter's next moon, Adrastea, lie within Jupiter's main ring and may be the source of material for the ring. Metis was discovered in images from Voyager 1, but little is known about it. It was not until 1996, when Galileo took a fuzzy image of the moon, that Metis was seen as anything more than a point of light. The image on page 69 is one of the best ever taken of Metis.This composite image shows, from left, Jupiter's moons Thebe, Amalthea, and Metis, on approximately the same scale.

JUPITER'S MOONS

Moon

Radius (miles [km]) Orbital eccentricity

Year discovered

Small inner satellites

1. Metis

14 (22)

0.001

1979

2. Adrastea

5 (8)

0.002

1979

3. Amalthea

85 X 51

X 47 (135 X 82 X 75)

0.003

1892

4. Thebe

Galilean satellites

0.018

1979

5. Io

1,134 (1,822)

0.000

1610

6. Europa

975 (1,561)

0.000

1610

7. Ganymede

1,645 (2,631)

0.001

1610

8. Callisto

1,506 (2,411)

0.007

1610

Themisto prograde group

9. Themisto

Himalia prograde group

0.242

2000

10. Leda

6 (9)

0.164

1974

11. Himalia

58 (93)

0.162

1904

12. Lysithea

12 (19)

0.112

1938

13. Elara

24 (39)

0.217

1905

14. S/2000 J11

Ananke retrograde group

0.248

2000

15. Euporie

5.2 (8.3)

0.144

2001

16. Orthosie

5.2 (8.3)

0.281

2001

17. Euanthe

5 (8)

0.232

2001

18. Thyone

5 (8)

0.229

2001

19. Harpalyke

4.8 (7.6)

0.226

2000

20. Hermippe

4.8 (7.8)

0.210

2001

21. Praxidike

4.8 (7.5)

0.230

2000

22. Iocaste

4.6 (7.3)

0.216

2000

23. Ananke

8.8 (14)

0.244

1951

Moon

Radius (miles [km])

Orbital eccentricity

Year discovered

Carme retrograde group

24. S/2002 J1

1 (1.5)

0.259

2002

25. Pasithee

0.6 (1)

0.267

2001

26. Chaldene

1.3 (2)

0.251

2000

27. Kale

0.6 (1)

0.260

2001

28. Isonoe

1.3 (2)

0.246

2000

29. Aitne

1 (1.5)

0.264

2001

30. Erinome

1 (1.5)

0.266

2000

31. Taygete

1.5 (2.5)

0.252

2000

32. Carme

15 (23)

0.253

1938

33. Kalyke

1.5 (2.5)

0.245

2000

Pasiphae retrograde group

34. Eurydome

2 (3)

0.276

2001

35. Autonoe

1.3 (2)

0.334

2001

36. Sponde

0.6 (1)

0.312

2001

37. Pasiphae

18 (29)

0.409

1908

38. Magaclite

2 (3)

0.421

2000

39. Sinope

12 (19)

0.250

1914

40. Calirrhoe

2 (3.5)

0.283

1999

Moons without well-

determined orbits

41. S/2003 J1

1.3 (2)

0.345

2003

42. S/2003 J2

0.6 (1)

0.380

2003

43. S/2003 J3

0.6 (1)

0.241

2003

44. S/2003 J4

0.6 (1)

0.204

2003

45. S/2003 J5

1.3 (2)

0.210

2003

46. S/2003 J6

1.3 (2)

0.157

2003

47. S/2003 J7

1.3 (2)

0.405

2003

48. S/2003 J8

1 (1.5)

0.264

2003

49. S/2003 J9

0.3 (0.5)

0.269

2003

(continues)

JUPITER'S MOONS

(continued)

Moon

Radius (miles [km])

Orbital eccentricity

Year discovered

50. S/2003 JI0

0.6 (1)

0.214

2003

51. S/2003 Jll

0.6 (1)

0.223

2003

52. S/2003 J12

0.3 (0.5)

0.376

2003

53. S/2003 J13

0.6 (1)

0.412

2003

54. S/2003 J14

0.6 (1)

0.222

2003

55. S/2003 J15

0.6 (1)

0.110

2003

56. S/2003 J16

0.6 (1)

0.270

2003

57. S/2003 J17

0.6 (1)

0.190

2003

58. S/2003 J18

0.6 (1)

0.119

2003

59. S/2003 J19

0.6 (1)

0.334

2003

60. S/2003 J20

1 (1.5)

0.295

2003

61. S/2003 J21

0.6 (1)

0.208

2003

62. S/2003 J22

0.6 (1)

0.233

2003

63. S/2003 J23

0.6 (1)

0.309

2003

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