and the Solar System in the event of a collision is currently unknown. Before the galaxies merge, there is a small chance that the Solar System could be ejected from the Milky Way or join the Andromeda Galaxy. Amateur observation Under most viewing conditions, the Andromeda Galaxy is one of the most distant objects that can be seen with the naked eye (M33 and M81 can be seen under very dark skies). The galaxy is commonly located in the sky about the constellations Cassiopeia and Pegasus. Andromeda is best seen during autumn nights in the Northern Hemisphere when it passes high overhead, reaching its highest point around midnight in October, and two hours earlier each successive month. In the early evening, it rises in the east in September and sets in the west in February. From the Southern Hemisphere the Andromeda Galaxy is visible between October and December, best viewed from as far north as possible. Binoculars can reveal some larger structures of the galaxy and its two brightest satellite galaxies, M32 and M110. An amateur telescope can reveal Andromeda's disk, some of its brightest globular clusters, dark dust lanes, and the large star cloud NGC 206. Discovery of the M31 [OIII] emission arc STROTTNER-DRECHSLER-SAINTY OBJECT 1, or SDSO-1, a previously unnoticed object nearby and possibly associated with Andromeda Galaxy, was discovered by an amateur astrophotography team composed of Marcel Drechsler, Xavier Strottner, and Yann Sainty, aided by Bray Falls. The discovery was announced on January 9, 2023. The long filamentary [O III] emission nebulosity object has been "hiding in plain sight" next to one of the most heavily photographed objects in space. It was previously unseen because it is very dim, and requires [O III] filters to photograph. It is not detected in Hα and has no obvious emissions in X-ray, UV, optical, radio, and IR surveys. "The [OIII] emission arc appears very bright in the images - but it is an extremely faint object that can only be adequately visualized by special subtraction techniques, since the signal in the unprocessed condition is almost completely outshone by the light from the galactic halo of M31." See also List of Messier objects List of galaxies New General Catalogue Notes References External links StarDate: M31 Fact Sheet Messier 31, SEDS Messier pages Astronomy Picture of the Day A Giant Globular Cluster in M31 1998 October 17. M31: The Andromeda Galaxy 2004