Amatha Galaxy (NGC 925)

NGC 925
NGC 925: Galaxy in Triangulum; 500 mm Cassegrain f/7.2; SBIG STL11K; 120-50-50-50 min LRGB; Bernese Highlands; © 2011 Radek Chromik

History

The galaxy was discovered on 13 September 1784 by the German-British astronomer William Herschel with his self-made 18.7 inch f/12.8 reflecting telescope in Slough, England. He recorded it as III 177, Class III standing for very faint nebulae. He noted: «Very faint, considerably large, irregularly round, resolvable, 2 or 3' in diameter.» [463] John L. E. Dreyer entered the galaxy as NGC 925 in his «New General Catalogue of Nebulae and Clusters of Stars» published in 1888. [313]

Physical Properties

The galaxy NGC 925 is an H-II galaxy of the morphological type SAB(s)d and has a redshift of z ≈ 0.00185, which corresponds to a distance of about 7 Mpc to 10 Mpc. It belongs to the NGC 1023 Galaxy Group. [145]

Revised+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
DesignationNGC 925
TypeGx (SBcd)
Right Ascension02h 27m 16.8s
Declination+33° 34' 44"
Diameter10.5 × 5.9 arcmin
Photographic (blue) magnitude10.7 mag
Visual magnitude10.1 mag
Surface brightness14.4 mag·arcmin-2
Position angle102°
Redshift0.001845
Distance derived from z7.79 Mpc
Metric Distance8.570 Mpc
Dreyer DescriptioncF, cL, E, vgbM, 2 st 13 np
Identification, RemarksUGC 1913, MCG 5-6-45, CGCG 504-85, IRAS 02243+3321, KARA 105, KUG 0224+333

Finder Chart

The galaxy is located in the Triangulum constellation. The best time to observe is July to February, when it is highest at night.

Chart Amatha Galaxy (NGC 925)
Amatha Galaxy (NGC 925) in constellation Triangulum. Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

More Objects Nearby (±15°)

References

145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/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
463«Catalogue of one thousand new nebulae and clusters of stars» William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1786; DOI:10.1098/rstl.1786.0027