Amatha Galaxy (NGC 925)
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]
| Designation | NGC 925 |
| Type | Gx (SBcd) |
| Right Ascension (J2000.0) | 02h 27m 16.8s |
| Declination (J2000.0) | +33° 34' 44" |
| Diameter | 10.5 × 5.9 arcmin |
| Photographic (blue) magnitude | 10.7 mag |
| Visual magnitude | 10.1 mag |
| Surface brightness | 14.4 mag·arcmin-2 |
| Position Angle | 102° |
| Redshift (z) | 0.001845 |
| Distance derived from z | 7.79 Mpc |
| Metric Distance | 8.570 Mpc |
| Dreyer Description | cF, cL, E, vgbM, 2 st 13 np |
| Identification, Remarks | WH III 177; h 222; GC 542; UGC 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. On 31 October it is in opposition to the Sun and crosses the meridian at local midnight. The best time to observe is June to March, when it is highest at night.
