Nereid, or Neptune II


Nereid is the third largest largest satellite of Neptune and the second easiest to image, Triton being in first place in both categories. Proteus is somewhat larger but orbits much closer to Neptune and is therefore very difficult to image from the Earth because it is lost in the glare from the planet. When this image was taken Nereid was at magnitude 18.75.

The greatly over-exposed disk of Neptune appears at the lower right of this image. Triton is visible but is also over-exposed and its image merges with that of Neptune; it is the bump on the top of Neptune's image.

Image information
Date and time of observation  2018-11-27 21:35 UT
Telescope 0.4m f/6.5 Dilworth-Relay
Filter None
Exposure 4918s
Centre of image RA 23h00m46.5s  Dec -7°23'46"
Image dimensions 11.8 arcmin × 5.7 arcmin