On the evening of December 4th, I went outside to throw out the trash, not expecting to see much in overcast sky. I looked up, and my eyes widened! I quickly grabbed my phone, and took this picture – 6 seconds handheld (thank you image stabilizing).
Not only was there a Moon dog, the Full Moon was bright enough for my wife Nancy and I to see color! You can see most of Auriga on the left, and Aldebaran on the right.
Right place , right time!
A moon dog (or moondog) or mock moon, also called a paraselene (plural paraselenae or paraselenes) in meteorology, is an atmospheric optical phenomenon that consists of a bright spot to one or both sides of the Moon. They are exactly analogous to sun dogs.
A member of the halo family, moon dogs are caused by the refraction of moonlight by hexagonal-plate-shaped ice crystals in cirrus clouds or cirrostratus clouds. They typically appear as a pair of faint patches of light, at around 22° to the left and right of the Moon, and at the same altitude above the horizon as the Moon. They may also appear alongside 22° halos.
Moon dogs are rarer than sun dogs because the Moon must be bright, about quarter moon or more, for the moon dogs to be observed. Moon dogs show little color to the unaided human eye because their light is not bright enough to activate the eye’s cone cells.
