NGC 1427A

---

title: "NGC 1427A" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["barred-irregular-galaxies", "eridanus-(constellation)", "ngc-objects", "principal-galaxies-catalogue-objects", "fornax-cluster", "eso-objects"] description: "Galaxy in the constellation Eridanus" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/NGC_1427A" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Galaxy in the constellation Eridanus ::

::data[format=table title="Infobox Galaxy"]

Field	Value
name	NGC 1427A
image	Irregular_galaxy_NGC_1427A_(captured_by_the_Hubble_Space_Telescope).jpg
caption	Hubble Space Telescope image of NGC 1427A
epoch	J2000
type	IB(s)m{{cite web
title	NASA/IPAC Extragalactic aDatabase
work	Results for NGC 1427a
url	http://nedwww.ipac.caltech.edu/
access-date	2007-04-21}}
ra
dec
dist_ly	51.9 Mly (15.9 Mpc)
z	0.006764
appmag_v	13.4
size_v	2.3 × 1.5
constellation name	Eridanus
names	ESO 358- G 049, MCG -06-09-016, FCC 235, PGC 13500
size	~23.21 kpc (estimated)
::

| name = NGC 1427A | image = Irregular_galaxy_NGC_1427A_(captured_by_the_Hubble_Space_Telescope).jpg | caption = Hubble Space Telescope image of NGC 1427A | epoch = J2000 | type = IB(s)m{{cite web | title=NASA/IPAC Extragalactic aDatabase | work=Results for NGC 1427a | url=http://nedwww.ipac.caltech.edu/ | access-date=2007-04-21}} | ra = | dec = | dist_ly = 51.9 Mly (15.9 Mpc) | z = 0.006764 | appmag_v = 13.4 | size_v = 2.3 × 1.5 | constellation name = Eridanus | notes = | names = ESO 358- G 049, MCG -06-09-016, FCC 235, PGC 13500 |size=~23.21 kpc (estimated)|h_radial_v=2028 ± 1 km/s|absmag_v=-18.62 ± 0.64}}

NGC 1427A, also known as ESO 358-49, or ESO 358-G049, is an irregular galaxy in the constellation Eridanus. Its distance modulus has been estimated using the globular cluster luminosity function to be 31.01 ± 0.21 which is about 52 Mly.{{Cite journal | last1 = Georgiev | first1 = Iskren Y. | last2 = Hilker | first2 = Michael | last3 = Puzia | first3 = Thomas H. | last4 = Chanamé | first4 = Julio | last5 = Mieske | first5 = Steffen | last6 = Goudfrooij | first6 = Paul | last7 = Reisenegger | first7 = Andreas | last8 = Infante | first8 = Leopoldo | date = June 2006 | journal = Astronomy and Astrophysics | volume = 452 | issue = 1 | pages = 141–153 | title = The old globular cluster system of the dIrr galaxy NGC 1427A in the Fornax cluster | bibcode = 2006A&A...452..141G | doi = 10.1051/0004-6361:20064880 |arxiv = astro-ph/0602263 | s2cid = 8546493

Characteristics and fate

NGC 1427A is over 20,000 light-years long and similar to the Large Magellanic Cloud. The resulting pressure is giving the galaxy its arrowhead outline and triggering the episodes of star formation.

Under the influence of galactic tides, NGC 1427A is travelling into the center of the Fornax Cluster with a velocity of approximately 600 km per second. Its distinctive arrowhead shape has been formed by this rapid, upwards movement. The interaction of NGC 1427A with Fornax gasses and galaxies during its journey will cause the disruption of the galaxy within the next billion years, an event which was common during the evolution of the Universe but has become increasingly rare.

Observations

The Hubble Space Telescope's Used Advanced Camera's for Surveys that were used to obtain images of NGC 1427A in visible (green), red, and infrared filters in January 2003. These images were then combined by the Hubble Heritage team to create the color image shown in box. Astronomers are using the data to investigate the star-formation patterns throughout the object, to verify a prediction that there should be a relation between the ages of stars and their positions within the galaxy. This will help them understand how the gravitational influence of the cluster has affected the internal workings of this galaxy, and how this galaxy has responded to passing through the cluster environment. This image was image of the day on March 4, 2005.

Background spiral galaxy

To the upper left of NGC 1427A is a background galaxy that happens to lie near Hubble's line of sight but is some 25 times further away, about 1.3 billion light-years away. In contrast to the irregularly shaped NGC 1427A, the background galaxy is a magnificent spiral, somewhat similar to our own Milky Way. Stars are forming in its symmetric pinwheel-shaped spiral arms, which can be traced into the galaxy's bright nucleus. This galaxy is, however, less dominated by very young stars than NGC 1427A, giving it an overall yellower color. At even greater distances background galaxies of various shapes and colors are scattered across the Hubble image.

References

References

1. {{cite constellation. NGC 1427A
2. "NGC 1427A".
3. "Your NED Search Results".
4. Administrator, NASA Content. (2017-02-07). "The Impending Destruction of NGC 1427A". NASA.
5. (2013-02-23). "NGC 1427A, an irregular galaxy in Eridanus". Anne's Astronomy News.
6. "APOD: 2005 March 4 - NGC 1427A: Galaxy in Motion".
7. "HubbleSite: Image - Galaxy NGC 1427A Plunges Toward the Fornax Galaxy Cluster".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::