Galaxies NGC 7253A, NGC 7253B

NGC 7253A/B
NGC 7253A/B: Pair of galaxies in Pegasus; 500 mm Cassegrain f/7.2; SBIG STL11K; 280-40-40-40 min LRGB; Bernese Highlands; © 2015 Radek Chromik


The galaxy NGC 7253 was visually discovered on September 9, 1863 by the German astronomer Albert Marth with a 48 inch reflecting telescope. [277] According to the description «very faint, rather elongated» in John LE Dreyer's «New General Catalogue of Nebulae and Clusters of Stars» [313] 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. [199]

Physical Properties

«Catalogue of Principal Galaxies (PGC)», Paturel et al. 1989 [144]
NameRA [hms]Dec [dms]mTypeDim [']Btot [mag]HRV [km/s]PA [°]
UGC 1198122 18 32.4+29 14 38D1.4 x 1.115.06412170
NGC 7253A22 19 28.9+29 23 11SB M1.7 x .514.4458771
NGC 7253B22 19 28.9+29 23 11S M1.6 x .515.04493126

Finder Chart

The galaxy pair NGC 7253A/B is located in the constellation Pegasus. The best observation time is June to November, when it is highest at night.

Chart NGC 7253
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]


144Catalogue of Principal Galaxies (PGC); Paturel G., Fouque P., Bottinelli L., Gouguenheim L.; Astron. Astrophys. Suppl. Ser. 80, 299 (1989); (2021-02-18)
149SkySafari 6 Pro, Simulation Curriculum;
160The STScI Digitized Sky Survey;
199Atlas Of Peculiar Galaxies, Halton Arp; (2020-12-28)
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; (2021-02-17)
313«A New General Catalogue of Nebulae and Clusters of Stars, being the Catalogue of the late Sir John F.W. Herschel, Bart., revised, corrected, and enlarged» Dreyer, J. L. E. (1888); Memoirs of the Royal Astronomical Society. 49: 1–237; Bibcode:1888MmRAS..49....1D