Jupiter’s 4 major satellites Io, Europa, Ganymede and Callisto are easy to see even with binoculars. After that it gets tricky, the next brightest is Amalthea at magnitude 14.1 which is already beyond what I can see with my telescope and it’s also very close to Jupiter. On 21/11/12 I imaged the next 2 which are Himalia (J6, magnitude 14.9) and Elara (J7, magnitude 16.6). I also tried Pasiphae and got it but the scope had dewed up so another image is needed.
Compare this with a map from Guide 9 (a superb program). The map goes to about magnitude 17
Also Elara taken at f3.3 with LX200 and HX516
Finally Pasiphae J8 which was magnitude 17.0 when I took this photo. Pasiphae is about 20km wide and 624 million km from Earth. If that seems a long way then the galaxy PGC15841 is 220 million light years away, which according to Google is 2000 million, million, million km. Looks like magnitude 17.0 is as low I can go.
