It was almost midnight last night when the first spooky apparition was picked up by one of UKIRT's thermal infrared security cameras and triggered the motion sensor. It had been a cold, dark and quiet night up until then but suddenly the software sent out a burst of images capturing our warm friend ghosting across the field of view.
A second later it had drifted to the right, its unearthly body and eerie limbs glowing brightly in infrared light.
And before you could say "Is it Halloween yet?" it was gone.