| Galaxy
aka PGC 9332, MCG 5-6-45, Uppsala 1913 RA: 02h27m16.8s Dec: +33°34'45" (Triangulum) Integrated Visual Magnitude: 10.9 Angular Diameter: 11.2' x 6.3' Mean Surface Brightness: 24.2 Mag/arc-sec² Minimum requirements to detect: 4-inch telescope under dark skies |
NGC
925 is a nearly face-on spiral galaxy in Triangulum. This galaxy
is part of the Hubble Space Telescope Key Project on the Extragalactic
Distance Scale, a long-term project dedicated to determining the Hubble
constant to within +/- 10% using Cepheid variable stars as distance indicators.
The Hubble constant defines the relationship between the distance of a
galaxy and its recession velocity due to the expansion of the Universe.
Knowing this relationship more precisely will give us a more accurate measure
of the age of the Universe. NGC 925 lies relatively nearby, with
a redshift of z=0.0019, corresponding to a recession velocity of 550 km/sec.
Visually, NGC 925 appears as a large, fuzzy oval with a gradual brightening toward the center. In my 18-inch at 250x I had difficulty getting a handle on the orientation of the brighter elongated central region and I observed a curious effect of the eye. As I moved my eye about the field testing different averted vision positions the central area actually appeared to "flip."
The field in an 6-inch f/8
at 50x. North is down and east is to the right.
| Millennium
Star Atlas Vol I Chart 122
Sky Atlas 2000 Chart 4 Uranometria 2000 Vol I Chart 93 Herald-Bobroff Astroatlas B-05 C-22 |
