 ngc 404 is a galaxy located about 10 million light years away in the constellation andromeda. it was discovered by william herschel in 1784, and is visible through small telescopes.mirach's ghost (ngc 404), the internet encyclopedia of science, david darling. accessed on line august 15, 2008. ngc 404 lies just beyond the local group and does not appear gravitationally bound to it. it is notable for being within 7 arc-minutes of second magnitude star mirach, making it a difficult target to observe or photograph and granting it the nickname "mirach's ghost".  == physical characteristics == ngc 404 is a very isolated dwarf lenticular galaxy, a bit more luminous and smaller than the small magellanic cloud and unlike many other early-type galaxies is very rich in neutral hydrogen, most of it concentrated on a pair of large rings around it.{{cite journal | author=del rÃ­o, m. s.; brinks, e.; cepa, j. | title=high-resolution h i observations of the galaxy ngc 404: a dwarf s0 with abundant interstellar gas | journal=the astronomical journal | year=2004 | volume=128 | issue=1 | pages=89â102 | bibcode=2004aj....128...89d | doi=10.1086/4213
Andromeda_(constellation) LINER_galaxies Lenticular_galaxies NGC_objects PGC_objects UGC_objects