Messier 97 — Planetary Nebula in Ursa Major

The Owl Nebula is a planetary nebula in the constellation Ursa Major, located approximately 2,030 light-years from Earth. It gets its popular name from two dark circular patches within the nebula that resemble the eyes of an owl when viewed through a telescope. M97 is one of the most complex planetary nebulae known, with a three-dimensional structure consisting of three concentric shells of expelled material. The central star is a white dwarf with a surface temperature of about 123,000 K and a luminosity approximately 41 times that of the Sun. The nebula spans about 1.8 light-years across and has an apparent diameter of roughly 3.4 arcminutes. Its estimated age is about 8,000 years.

Located in Ursa Major, about 2.3 degrees southeast of Merak (Beta Ursae Majoris), the bottom-right star of the Big Dipper's bowl. At magnitude 9.9 with low surface brightness, M97 is one of the fainter Messier objects and requires dark skies. A 4-inch telescope shows a faint, round, ghostly disk. An 8-inch telescope with an OIII filter significantly improves contrast and may begin to reveal the two dark 'eye' spots with averted vision. A 12-inch or larger telescope under excellent conditions shows the owl face clearly. Located just 48 arcminutes from M108 (an edge-on galaxy), the pair makes a fine combination in a wide-field eyepiece. Best observed from January through June.

Discovered by Pierre Mechain on February 16, 1781. Charles Messier observed it the same year and described it as a faint nebula near Beta Ursae Majoris. The 'Owl' nickname was given by Lord Rosse in 1848, who sketched the two dark patches through his 72-inch telescope at Birr Castle. William Huggins used spectroscopy in 1866 to confirm its gaseous nature, helping establish that planetary nebulae are clouds of gas rather than unresolved star clusters.