Iapetus is named after a Titan in Greek mythology and was discovered by Cassini in 1671. It is the third largest satellite of Saturn and is 1492km in diameter. Iapetus is unusual in that one hemisphere is much darker than the other so its magnitude varies betwen 10.2 and 11.9 The image here shows its entire darker hemisphere at a magnitude measured to be 11.82.
| Date and times of observation | 2020-08-11 22:48 UT |
| Telescope | 0.4m f/6.5 Dilworth-Relay |
| Camera | Starlight Xpress Trius-PRO SX814 CCD |
| Filter | None |
| Exposure | 85s in 4 subs, average stacked |
| Centre of image | RA 19h54m53.0s Dec -21°02'47" |
| Image dimensions | 15.0 arcmin × 9.2 arcmin |