Interacting Galaxies NGC 4725, NGC 4747

Object Description

NGC 4725
NGC 4725: Galaxy in Coma Berenices; 500 mm Cassegrain 5800mm f11.4; SBIG STL11K; 90-10-10-10 min LRGB; Bernese Highlands; © 2005 Radek Chromik

The galaxy NGC 4725 was discovered on April 6, 1785 by William Herschel with his 18.7 inch reflecting telescope. [277] This is a Seyfert 2 galaxy of the morphological type SABab. Distance specifications range from 12 Mpc to 17.4 Mpc. [145]

That same night, Herschel discovered the smaller, irregular galaxy NGC 4747, 24 arc minutes to the northeast. Halton Arp listed NGC 4747 in his 1966 «Atlas of Peculiar Galaxies» as Arp 159 as a disturbed galaxy with internal absorption. [199] Distances to this galaxy range from 8.2 Mpc to 24.3 Mpc. [145] It is thus in close proximity to the much larger galaxy NGC 4725. The irregular shape is due to gravitational interaction. The tidal arms can be seen on long exposure images. [430]

The spiral galaxy NGC 4712 was discovered later on March 28, 1832 by John Herschel with his 18.3 inch reflecting telescope. [277] It is much further away at a distance of about 60 Mpc. [145]

NGC 4712
NGC 4712: Section of the Sloan Digitized Sky Survey [147]
NGC 4747
NGC 4747: Section of the Sloan Digitized Sky Survey [147]
«Revised New General Catalogue and Index Catalogue», «Historically Corrected New General Catalogue», Dr. Wolfgang Steinicke, 2021 [277]
NameRADecTypeBmagVmagDimDreyer DescriptionIdentification
NGC 4712 12 49 34.1+25 28 11Gx (Sbc)13.312.82.30 × 0.9vF, pLUGC 7977, MCG 4-30-21, CGCG 129-25, KUG 1247+257A, IRAS 12471+2544
NGC 4725 12 50 26.5+25 30 00Gx (SBab/P)10.19.410.70 × 7.6vB, vL, E, vg, vsvmbMeBNUGC 7989, MCG 4-30-22, CGCG 129-27, KUG 1247+257B, IRAS 12478+2545
NGC 4747 12 51 45.4+25 46 26Gx (SBcd)13.012.43.30 × 1.3F, pL, lEUGC 8005, MCG 4-30-23, CGCG 129-28, IRAS 12492+2602, Arp 159, KUG 1249+260

Finder Chart

The galaxy NGC 4725 is located in the constellation Coma Berenices. The best observation time is January to July, when it is highest at night.

Chart NGC 4725
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

References

145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
147Aladin Lite; aladin.u-strasbg.fr/AladinLite (2020-12-23)
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
199Atlas Of Peculiar Galaxies, Halton Arp; ned.ipac.caltech.edu/level5/Arp/Arp_contents.html (2020-12-28)
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
430«Neutral hydrogen observations of the interacting galaxies NGC 4725 and NGC 4747» Wevers, B. M. H. R.; Appleton, P. N.; Davies, R. D. ; Hart, L.; Astronomy and Astrophysics, Vol. 140, p. 125-140 (1984); Bibcode:1984A&A...140..125W