LEDA 74886 explained

LEDA 74886
Credit:	Alister Graham, Subaru Telescope, National Astronomical Observatory of Japan (NAOJ)
Epoch:	J2000
Constellation Name:	Eridanus
Ra:	^[1]
Dist Ly:	70000abbr=onNaNabbr=on
Group Cluster:	NGC 1407
Type:	S0 ^[2]
Mass:	1
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,^[3] is a dwarf galaxy with a rare rectangular shape. It is located at a distance of about 70000000ly in the Eridanus constellation.^[4] The galaxy was detected in a wide field of view image taken by the Subaru Telescope using the Subaru Prime Focus Camera (Suprime-Cam).^{[5] [6]} 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_☉).

Location

LEDA 74886 is located in the celestial sphere at a right ascension (

\alpha ) of, and a declination (\delta ) of (J2000). It is located within the Galactic corona of NGC 1407, a massive spherical galaxy which is located approximately 163,000 ly (50 kpc) to the northwest of LEDA 74886.^[7]

See also

• SDSS J074018.17+282756.3 is a spiral galaxy with arms that have a somewhat squarish-looking interior, but is distinct from LEDA 74886, because LEDA 74886 has no apparent spiral structure and a boxy like exterior form.^[7]
• Sextans A, a member of the local group, has a box like form due to its expanding shell of young blue stars, but it has a much lower mass and density, and includes a central disc which LEDA 74886 does not include.^[7]
• NGC 4488

Notes and References

1. 6dFGS gJ034043.2-183843. 20 March 2012.
2. NED, LEDA 074886 (accessed 20 March 2012)
3. Web site: Major . Jason . Rare Rectangle Galaxy Discovered . . www.universetoday.com . 27 October 2021 . 20 March 2012.
4. News: Rare "Emerald Cut" Galaxy Found. https://web.archive.org/web/20120322055739/http://news.nationalgeographic.com/news/2012/03/120320%2Drectangular%2Dgalaxy%2Demerald%2Dcut%2Ddiamond%2Dsubaru%2Dspace%2Dscience/. dead. March 22, 2012. National Geographic News. Rachel Kaufman. March 20, 2012. March 21, 2012.
5. News: Astronomers Discover Galaxy That Resembles An Emerald-Cut Diamond. Asian Scientist. March 20, 2012. March 21, 2012.
6. Surprising Discovery of a Rare "Emerald-Cut" Galaxy. Subaru Telescope—National Astronomical Observatory of Japan. March 19, 2012. March 23, 2012.
7. 1203.3608. The Astrophysical Journal. 750. 2. 121. March 19, 2012. Graham. Alister W.. Spitler. Lee R.. Forbes. Duncan A.. Lisker. Thorsten. Moore. Ben. Janz. Joachim. Leda 074886: A Remarkable Rectangular-Looking Galaxy . 10.1088/0004-637X/750/2/121. 2012ApJ...750..121G . 28425342 .