NGC 925, Amatha Galaxy

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 September 13, 1784 by the German-British astronomer William Herschel with his self-made 18.7 inch f/12.8 reflecting telescope in Bath, 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]

«Catalogue of Principal Galaxies (PGC)», Paturel et al. 1989 [144]
DesignationsPGC 9332: NGC 925, UGC 1913, MCG 5-6-45, CGCG 504-85, IRAS 2243+3321, KARA 105
Right Ascension (J2000.0)02h 27m 16.8s
Declination (J2000.0)+33° 34' 42"
Morphological TypeSB
Dimensions10.9' x 6.2'
Visual Magnitude10.6 mag
Radial Velocity (HRV)554 km/s
Position Angle102°

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 NGC 925
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

References

144Catalogue of Principal Galaxies (PGC); Paturel G., Fouque P., Bottinelli L., Gouguenheim L.; Astron. Astrophys. Suppl. Ser. 80, 299 (1989); cdsarc.unistra.fr/viz-bin/cat/VII/119 (2021-02-18)
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
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