Messier 104 — Galaxy in Virgo

The Sombrero Galaxy is one of the most visually striking galaxies in the sky, located approximately 29.3 million light-years from Earth in the constellation Virgo, near the border with Corvus. Its distinctive appearance — a brilliant white core surrounded by a broad, dark dust lane seen nearly edge-on — gives it a remarkable resemblance to a wide-brimmed Mexican hat. M104 is classified as type SA(s)a or Sa/Sb, though its true nature is complex. It has an unusually large central bulge powered by a supermassive black hole of about one billion solar masses — one of the most massive black holes measured in any nearby galaxy. The galaxy spans approximately 50,000 light-years in diameter and possesses an extensive system of nearly 2,000 globular clusters, far more than the Milky Way's roughly 150. The prominent dust lane is a ring of gas and dust that encircles the entire galaxy within its disk plane.

Located about 11.5 degrees due west of Spica (Alpha Virginis) and 5.5 degrees northeast of Eta Corvi. At magnitude 8.0, M104 is one of the brighter Messier galaxies and can be spotted in large binoculars as a small, elongated glow. A 4-inch telescope at 100x shows the characteristic shape: a bright, bulging core with the disk extending to either side. The dark dust lane becomes visible in a 6-inch telescope under good conditions as a thin, dark line cutting across the southern edge of the bulge. An 8-inch or larger telescope at 150-200x provides a stunning view, clearly showing the sombrero profile with the dust lane sharply defined against the bright bulge. One of the most rewarding galaxies for visual observers. Best observed from March through June.

Discovered by Pierre Mechain on May 11, 1781, who described it as a faint nebula. It was not included in Messier's original 1781 catalog but was found in Messier's personal annotated copy and added as M104 by Camille Flammarion in 1921. William Herschel independently discovered it in 1784 and was the first to note the dark 'stratum' (dust lane). Vesto Slipher measured M104's large redshift in 1912 — one of the first indications that such 'nebulae' were external galaxies moving at enormous speeds.