Here are the astronomical events occurring in the month of June: (All times are given in UTC format)
- June 1: The ISS will reach full illumination, which means Northern Hemisphere observers will be able to see it many times.
- June 4: Io and Ganymede will cause a double-transit on Jupiter, which will occur from 4:54 to 6:13.
- June 5: Venus reaches greatest eastern elongation for 2015. It will be at most 45 degrees from when the sun at 16:00.
- June 10: Asteroid 424 Gratia will occult a +6.1 magnitude star. It will occur at approximately 15:10 in Northwest Australia.
- June 15: The Moon will occult Mercury at approximately 2:26. It’s best seen at the South Indian Ocean.
- June 15: The Moon will occult Aldebaran during the day approximately 11:33. It’s best seen in the high Arctic.
- June 16: Comet C/2014 Q1 PanSTARRS may become visible with the naked eye.
- June 21: The summer solstice will happen at 10:51. Northern Hemisphere observers will experience the longest day of the year.
- June 24: Mercury reaches its greatest morning elongation at 22.5 degrees west of the sun. This will take place at 17:00.