LEDA 74886

{{Short description|Dwarf galaxy in the constellation Eridanus with a rectangular shape}}

{{Infobox galaxy

| name = LEDA 74886

| image = LEDA 074886.jpg

| image_size = 200px

| caption = False color image of galaxy LEDA 74886, taken by the Subaru Telescope. The contrast of this image has been adjusted to highlight the internal disk/bar like structure.

| credit = Alister Graham, Subaru Telescope, National Astronomical Observatory of Japan (NAOJ)

| epoch = J2000

| constellation name = Eridanus

| ra = {{RA|03|40|43.233}}{{cite simbad|title=6dFGS gJ034043.2-183843|access-date=20 March 2012}}

| dec = {{DEC|-18|38|43.10}}

| dist_ly = {{convert|70000|kly|kpc|abbr=on|lk=on}} {{hub|0.73}}

| group_cluster = NGC 1407

| type = S0 NED, [http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=LEDA+074886&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES LEDA 074886] (accessed 20 March 2012)

| mass = 1{{e|9}}

| names = 2MASX J03404323-1838431, 6dFGS gJ034043.2-183843

}}

LEDA 74886, also known by its 2MASX designation 2MASX J03404323-1838431, and sometimes known as the Emerald-cut Galaxy,{{cite web |last1=Major |first1=Jason |title=Rare Rectangle Galaxy Discovered |url=https://www.universetoday.com/94241/rare-rectangle-galaxy-discovered/ |website=Universe Today |publisher=www.universetoday.com |access-date=27 October 2021 |date=20 March 2012}} is a dwarf galaxy with a rare rectangular shape. It is located at a distance of about {{Convert|70000000|ly|Mpc}} in the Eridanus constellation.{{cite news|url=http://news.nationalgeographic.com/news/2012/03/120320-rectangular-galaxy-emerald-cut-diamond-subaru-space-science/|archive-url=https://web.archive.org/web/20120322055739/http://news.nationalgeographic.com/news/2012/03/120320%2Drectangular%2Dgalaxy%2Demerald%2Dcut%2Ddiamond%2Dsubaru%2Dspace%2Dscience/|url-status=dead|archive-date=March 22, 2012|title=Rare "Emerald Cut" Galaxy Found|journal=National Geographic News| author=Rachel Kaufman|date=March 20, 2012|access-date = March 21, 2012}} The galaxy was detected in a wide field of view image taken by the Subaru Telescope using the Subaru Prime Focus Camera (Suprime-Cam).{{cite news|url=http://www.asianscientist.com/in-the-lab/leda-074886-emerald-cut-diamond-shape-galaxy/|title=Astronomers Discover Galaxy That Resembles An Emerald-Cut Diamond|newspaper=Asian Scientist|date=March 20, 2012|access-date=March 21, 2012}}{{cite press release|url=http://www.naoj.org/Pressrelease/2012/03/19/index.html|title=Surprising Discovery of a Rare "Emerald-Cut" Galaxy|publisher=Subaru Telescope—National Astronomical Observatory of Japan|date=March 19, 2012|access-date=March 23, 2012}} Using the Keck Telescope, a thin disc with a side on orientation was confirmed to be lurking at the center of LEDA 74886, and spinning at a speed of 33 km/s at the orbital radius of half a kpc. LEDA 74886 has a mass of around 10⁹ M_☉ (Compared to the Milky Way's mass of about 10¹² M_☉).