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 19.1.

The prominent trail towards the bottom of the image comes from the 17.7 magnitude asteroid (16095) Lorenball which happened to be passing by when the image was taken.

Image information
Date and time of observation  2020-09-14 02:00 UT
Telescope 0.4m f/6.5 Dilworth-Relay
Camera Starlight Xpress Trius-PRO SX814 CCD
Filter None
Exposure 2200s in 38 subs
Centre of image RA 23h22m28.2s  Dec -5°15'05"
Image dimensions 9.5 arcmin × 7.8 arcmin