Visible now to the naked eye. Look north after dinner (if you live in the Eastern USA). At about 3 fist widths up from the horizon you will see Casseiopia (looks like a W on its side or a stylized 3). Now look down and slightly to the right and you will see a bright star about 1 fist width at arms length below Casseiopia, that is a star called Mirfak in Persius. That star forms a triangle with two other stars, a small triangle. The one on the left, is Comet 17P/Holmes. It is currently between the orbits of Mars and Jupiter. It suffered an 'outburst' a few days ago and brightened from magnitude 17 to magnitude 2.9 (500,000 times brighter). This image was taken using a 80mm telescope, 40 x 10 second exposures stacked using Nebulosity from Stark Labs. It does actually look green through a telescope. The reason it looks round and not comet shape is that the tail is pointing directly away from us. It is NOT heading for us so panic ye not. Enjoy, and Clear Dark Skies to all.