Proteus - Voyager 2

Neptune's Second Largest moon, Proteus

Detail of Voyager 2 image showing Neptune's second largest satellite, Proteus. Proteus is about 436 x 416 x 402 km in size, of Neptune's moons only Triton is larger. The satellite orbits Neptune with a semi-major axis of 118,000 km and a period of almost 27 hours. This image was taken on 25 August 1989 at a range of 144,000 km. Proteus is about 320 km across in this image and north is at 1:30. (Voyager 2, FDS 11389.20)
Larger image: 353K

High resolution tiff file (1.0M)

Location & Time Information
Date/Time (UT): 1989-08-25 T 03:10:21
Distance/Range (km): 144,000.
Central Latitude/Longitude (deg): 4.,334.
Orbit(s): Flyby

Imaging Information
Area or Feature Type: Global View
Instrument: Narrow Angle Vidicon Camera
Instrument Resolution (pixels): 800 x 800, 8 bit
Instrument Field of View (deg): 0.424 x 0.424
Filter: clear
Illumination Incidence Angle (deg): N/A
Phase Angle (deg): 52.48
Instrument Look Direction: N/A
Surface Emission Angle (deg): N/A

Ordering Information
CD-ROM Volume: VG_0011
NASA Image ID number: FDS 11389.20
Other Image ID number: Picno 1736N2-001
NSSDC Data Set ID (Photo): NSD XD-12A
NSSDC Data Set ID (CD): 77-076-01f
Other ID:


[NASA Logo] Authors/Curators:

Dave Williams,, (301) 286-1258
Code 690.1, NASA Goddard Space Flight Center
Greenbelt, MD 20771, USA

Jay Friedlander,, (301) 286-7172
Code 612.4, NASA Goddard Space Flight Center
Greenbelt, MD 20771, USA

NASA Official: Dr. David R. Williams,

Last updated: 24 September 2015