Księżyce Neptuna

Artykuł zawiera podstawowe dane dotyczące wszystkich odkrytych naturalnych satelitów Neptuna (stan na 2018 rok).

NumerNazwaZdjęciePółoś wielka
[tys. km][1]
Nachylenie orbity
Mimośród orbity[1]Okres obiegu
Wielkość gwiazdowa
Rok odkrycia[2]
IIINajadaNaiad Voyager.png48,24,740,0000,29424,1581989
VIGalateaGalatea moon.jpg62,00,0540,0000,42922,01581989
VIILarissaLarissa 1.jpg73,50,2010,0010,55521,51921989
VIIIProteuszProteus (Voyager 2).jpg117,60,0390,0001,12220,04161989
ITrytonTriton moon mosaic Voyager 2 (large).jpg354,8156,80,0005,8813,027061846
IXHalimede15 728134,10,2911879,724,5612002
XISao22 42248,510,2832914,125,4402002
XIILaomedea23 57134,740,4343167,925,4402002
XPsamathe46 695137,40,4629115,925,6382003
XIIINeso48 387132,60,4249374,024,6602002


  1. Wartości powyżej 90° oznaczają, że satelita porusza się ruchem wstecznym.


  1. a b c d e f Scott S. Sheppard: Neptune Moons (ang.). [dostęp 2018-12-12].
  2. Planetary Satellite Discovery Circumstances (ang.). Jet Propulsion Laboratory, 2018-10-02. [dostęp 2018-12-12].

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Naiad Voyager.png
Naiad as seen by en:Voyager 2. The image is smeared due to the combination of long exposure needed at this distance from the Sun, and the rapid relative motion of the moon and Voyager. Hence, the moon appears more elongated than in reality. Subsequently the brightness was processed and the image cropped somewhat
Triton moon mosaic Voyager 2 (large).jpg
Global Color Mosaic of Triton, taken by Voyager 2 in 1989
Solar System XXX.png
This is a revised version of Solar_System_XXIX.png.
Despina as seen by Voyager 2. There is significant horizontal smearing due to the combination of long exposure needed at this distance from the Sun, and the rapid relative motion of the moon and Voyager.
Proteus (Voyager 2).jpg
Proteus is the second largest moon of Neptune behind the mysterious Triton. Proteus was discovered only in 1989 by the Voyager 2 spacecraft. This is unusual since Neptune has a smaller moon - Nereid - which was discovered 33 years earlier from Earth. The reason Proteus was not discovered sooner is that its surface is very dark and it orbits much closer to Neptune. Proteus has an odd box-like shape and were it even slightly more massive, its own gravity would cause it to reform itself into a sphere.

Original NASA caption: This image of Neptune's satellite 1989N1 was obtained on Aug. 25, 1989 from a range of 146,000 kilometers (91,000 miles). The resolution is about 2.7 kilometers (1.7 miles) per line pair.

The satellite, seen here about half illuminated, has an average radius of some 200 kilometers (120 miles). It is dark (albedo 6 percent) and spectrally grey. Hints of crater-like forms and groove-like lineations can be discerned. The apparent graininess of the image is caused by the short exposure necessary to avoid significant smear.
Larissa 1.jpg

Image:Larissa.jpg cropped and cut down to show only one image.

The photojournal caption for the original image:

These Voyager 2 images of satellite 1989N2 at a resolution of 4.2 kilometers (2.6 miles) per pixel reveal it to be and irregularly shaped, dark object. The satellite appears to have several craters 30 to 50 kilometers (18.5 to 31 miles) across. The irregular outline suggests that this moon has remained cold and rigid throughout much of its history. It is about 210 by 190 kilometers (130 by 118 miles), about half the size of 1989N1. It has a low albedo surface reflecting about 5 percent of the incident light. The Voyager Mission is conducted by JPL for NASA's Office of Space Science and Applications.
Galatea moon.jpg
Galatea as seen by Voyager 2. The image is smeared due to the combination of long exposure needed at this distance from the Sun, and the rapid relative motion of Galatea and Voyager. Hence, Galatea appears more elongated than in reality.
Neptune - Voyager 2 (29347980845) flatten crop.jpg
Uploader's notes: The original NASA/Cowart PNG image has been modified by flattening (combining layers), cropping and converting to JPEG format.

Original caption released with image:
Voyager 2 Narrow Angle Camera image of Neptune taken on August 20, 1989 as the spacecraft approached the planet for a flyby on August 25. The Great Dark Spot, flanked by cirrus clouds, is at center. A smaller dark storm, Dark Spot Jr., is rotating into view at bottom left. Additionally, a patch of white cirrus clouds to its north, named "Scooter" for its rapid motion relative to other features, is visible.

This image was constructed using orange, green and synthetic violet (50/50 blend of green filter and UV filter images) taken between 626 and 643 UT.

Image Credit: NASA / JPL / Voyager-ISS / Justin Cowart
Rhea true color.jpg
Cassini color image of Rhea, showing the wispy trailing hemisphere.