NGC 7253

Also Known as: Arp 278, UGC 11984 & 11985, PGC 68572 & 68573

Object Type: Galaxies

Constellation: Pegasus

Distance from Earth: 200 million light years

Apparent Magnitude: 13.2 and 14.3

Coordinates: RA 22H 19M 28.9S DEC 29deg 23min 30.0sec

Actual Size: 135,000 light years & 71,400 light years

Apparent Dimensions: 1.7 arc-minutes x 0.8 arc-minutes & 1.6 arc-minutes x 0.5 arc-minutes

Discovered by: The galaxy NGC 7253 was visually discovered on 9 September 1863 by the German astronomer Albert Marth with a 48 inch reflecting telescope.
According to the description «very faint, rather elongated» in John LE Dreyer's «New General Catalogue of Nebulae and Clusters of Stars» He did not seem to have recognized both galaxies at that time, especially since the extragalactic nature of these nebulae was still completely unknown at that time.
Halton Arp divided his «Atlas of Peculiar Galaxies», published in 1966, into groups based on purely morphological criteria. The pair of galaxies here received the designation Arp 278 (APG 278) as a pair of interacting galaxies.

Description: NGC 7253 is a pair of spiral galaxies in the constellation Pegasus.
It is listed in Halton Arp's Atlas of Peculiar Galaxies as Arp 278, as an example of gravitationally interacting galaxies.
Of the pair, the galaxy to the north is known individually as NGC 7253A. Its velocity relative to the cosmic microwave background is 4,235 ± 24 km/s, which corresponds to a Hubble distance of 62.5 ± 4.4 Mpc (~204 million light-years).
The other galaxy in the pair is known individually as NGC 7253B. Its velocity relative to the cosmic microwave background is 4,165 ± 24 km/s, which corresponds to a Hubble distance of 61.4 ± 4.3 Mpc (~200 million light-years). With a surface brightness equal to 14.06 Mag/arcsec2, NGC 7253B can be described as a low surface brightness galaxy.

Click Below Image(s) for Full Size:

NGC 7253 is a Galaxy Pair in the Pegasus constellation. NGC 7253 is situated north of the celestial equator and, as such, it is more easily visible from the northern hemisphere.

Platesolve

NGC 7253 Galaxies wide field

NGC 7253 Galaxies

Imaging Details
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