"Credit: ESA/ISO, [Instrument = CAM,LWS,PHT,SWS], PI"
Where the 'Instrument' is simply the instrument that performed the observation and the PI is the person for whom the observation was performed.
We would also appreciate it if you could send a copy of your publication to us and refer to our home (or science) page in your article (or caption).
For example, compare the suggested short credit that we have attached to the following image to the one that is on the gallery page.
And for a printed article please add the extra line;