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要 galatea ( 海衛六 / 卡拉提爾 ) 既少少資料

要 galatea ( 海衛六 / 卡拉提爾 ) 既少少資料



粒野係gas form/liquid form/solid form?





1 Answer

  • 1 decade ago
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    Galatea (moon)

    From Wikipedia, the free encyclopedia

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    Galatea as seen by Voyager 2

    (smearing has caused excessive elongation)


    Discovered by Stephen P. Synnott[1] and Voyager Imaging Team

    Discovered in July 1989

    Orbital characteristics[2]

    Epoch 18 August 1989

    Semi-major axis 61 953 ± 1 km

    Eccentricity 0.00004 ± 0.00009

    Orbital period 0.42874431 ± 0.00000001 d

    Inclination 0.052 ± 0.011° (to Neptune equator)

    0.06° (to local Laplace plane)

    Is a satellite of Neptune

    Physical characteristics

    Dimensions 204×184×144 km (±~10 km)[

    Mean radius 88 ± 4 km[5]

    Mass 2.12 ± 0.08 × 1018 kg

    Mean density 0.75 ± 0.1 g/cm3

    Rotation period assumed synchronous

    Axial tilt ~zero presumably

    Albedo (geometric) 0.08

    Surface temp. ~51 K mean (estimate)

    Atmosphere none

    There is also an asteroid called 74 Galatea.

    Galatea inside of a faint ring arc near Neptune.Galatea (pronounced /ˈɡæləˈtiːə/ GAL-ə-TEE-ə, or as in Greek Γαλάτεια), also known as Neptune VI, is the fourth closest inner satellite of Neptune. It is named after Galatea, one of the Nereids of Greek legend.

    Galatea was discovered in late July, 1989 from the images taken by the Voyager 2 probe. It was given the temporary designation S/1989 N 4[7] The discovery was announced (IAUC 4824) on August 2, 1989, but the text only talks of "10 frames taken over 5 days", giving a discovery date of sometime before July 28. The name was given on 16 September 1991

    It is irregularly shaped and shows no sign of any geological modification. It is likely that it is a rubble pile re-accreted from fragments of Neptune's original satellites, which were smashed up by perturbations from Triton soon after that moon's capture into a very eccentric initial orbit.[9]

    Galatea's orbit lies below Neptune's synchronous orbit radius, so it is slowly spiralling inward due to tidal deceleration and may eventually impact Neptune's atmosphere, or break up into a planetary ring upon passing its Roche limit due to tidal stretching.

    Source(s): wiki.english
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