Sinope, or Jupiter IX


Sinope is a small outer satellite of Jupiter which takes almost two years to orbit the planet in a retrograde direction. It is only 38 km in diameter, making it the eleventh largest Jovian satellite. Sinope was magnitude 18.0 at the time of observation.

When these images was taken Jupiter and its satellites were located within a dense portion of the Milky Way in Ophiuchus, which explains why there are so many stars of comparable or greater brightness in the image. The two somewhat brighter stars either side of Sinope are separated by only 12.5 arcseconds, so the fainter of the pair is about 4 arcseconds away from the satellite and the other is around 8 arcseconds.

Image information
Date and times of observation  2019-06-20 03:15 UT
Telescope 0.4m f/6.5 Dilworth-Relay
Filter None
Exposure 10s+8×60s median-stacked
Centre of image RA 17h12m12.2s  Dec -22°48'44"
Image dimensions 3.5 arcmin × 3.5 arcmin