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Hi Orestis,
Whenever this situation arises again and you draw what you see at the eyepiece, which is a great thing to do, record the time. That is, record your local time and convert that to UTC Universal time.
To help you do that there is a terrific little application called Als Clock that you can down load from, I think, the resources section of IIS.
Having done this it is then possible to positively identify what ever features you have drawn.
Depending on the time last night you could have seen, Europa's shadow and Ganymede or Ganymede and its shadow.
If you check the solar system images forum you will see images of Jupiter from last night by Stuart and myself with Ganymede and its shadow transiting Jupiter.
Regards
Trevor
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