Themisto (moon)
Outer moon of Jupiter / From Wikipedia, the free encyclopedia
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Themisto /θəˈmɪstoʊ/, also known as Jupiter XVIII, is a small prograde irregular satellite of Jupiter. It was discovered in 1975, subsequently lost, and rediscovered in 2000.
Quick Facts Discovery, Discovered by ...
![]() Rediscovery images of Themisto taken by the UH88 telescope in November 2000 | |
Discovery[1][2] | |
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Discovered by | Charles T. Kowal (1975) Elizabeth P. Roemer (1975) Scott S. Sheppard (2000) David C. Jewitt (2000) Yanga R. Fernández (2000) Eugene A. Magnier (2000) |
Discovery site | Palomar Observatory Mauna Kea Observatory (rediscovery) |
Discovery date | 30 September 1975 21 November 2000 (rediscovery) |
Designations | |
Designation | Jupiter XVIII |
Pronunciation | /θəˈmɪstoʊ/[3] |
Named after | Θεμιστώ Themistō |
S/2000 J 1 S/1975 J 1 | |
Adjectives | Themistoan /θɛməˈstoʊ.ən/[4] Themistoian /θɛməˈstoʊ.iən/ |
Orbital characteristics[5] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Observation arc | 42.54 yr (15,536 days) |
0.0494401 AU (7,396,130 km) | |
Eccentricity | 0.2522112 |
+129.95 d | |
2.39396° | |
2° 46m 13.369s / day | |
Inclination | 45.28121° (to ecliptic) |
192.64162° | |
241.25168° | |
Satellite of | Jupiter |
Group | (own group) |
Physical characteristics | |
9 km[6] 16.4 km[7] | |
Albedo | 0.04 (assumed) |
21.0[6] | |
12.9[5] 13.06±0.34 (V)[7] | |
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