Thalassa
Neptune IV - 1989N5
Thalassa appears to be about 80 kilometers (50 miles)
in diameter. It orbits Neptune in 7 hours, 30 minutes about
25,200 kilometers (15,700 miles) above the cloud tops.
It is irregularly
shaped and shows no sign of any geological modification. Thalassa circles
the planet in the same
direction as Neptune rotates. The above image has been slightly smeared
so that Thalassa appears highly elongated.
| Thalassa Statistics
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| Discovered by | Voyager 2
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| Date of discovery | 1989
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| Mass (kg) | ?
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| Equatorial radius (km) | 40
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| Equatorial radius (Earth = 1) | 6.2716e-03
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| Mean density (gm/cm^3) | ?
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| Mean distance from Neptune (km) | 50,000
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| Rotational period (days) | ?
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| Orbital period (days) | 0.311485
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| Mean orbital velocity (km/sec) | 11.68
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| Orbital eccentricity | 0.0002
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| Orbital inclination (degrees) | 0.21
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| Visual geometric albedo | 0.06
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| Magnitude (Vo) | 23.8
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Neptune
Naiad
Despina
Copyright © 1997 by Calvin J. Hamilton.
All rights reserved.