Between Saturday June 25th and Sunday June 26th the waning gibbous Moon will pass close by the outermost of the 8 known planets, Neptune. Depending on your longitude you may see an occultation of Neptune by the Moon. From my location of about 94o west the Moon will pass by Neptune coming as close as around 5o as this graphic shows.
However observers viewing from the western side of Europe will either see the occultation or see a very close conjunction between the Moon, the star Lambda Aquarii, and Neptune.
Neptune has an apparent magnitude of nearly 8.0 making it not visible to the naked eye, but certainly within the reach of even moderate sized telescopes.
Click here to go to the Qué tal in the Current Skies web site for more observing information for this month.