H-NGC7331
Galaxy in Pegasus
About
An unbarred spiral galaxy in Pegasus, about 44 million light-years away, often compared to our own Milky Way. The bulge at its centre spins against the rotation of the disk around it. Five supernovae have been recorded in it.
Imaging tips
- It spans about 11′ by 4′, so it fills a third to half of an APS-C frame at roughly 2,200–3,670 mm; full frame needs 3,380–5,630 mm.
- Broadband imaging only. At 22.2 mag/arcsec² the outer disk is faint, so plan for many hours of luminance and a dark sky.
- Small, much more distant galaxies (NGC 7335, 7336, 7337, 7340, 300–350 million light-years away) lie behind and around it in a wider field.
- Rises high in the sky for northern observers, best in August and September.
Facts
- Size
- 11′ × 4′
- Magnitude
- 9.5
- Coordinates
- RA 22h 37.1m, Dec +34° 25′
- Framing, APS-C
- 2200–3670 mm
- Framing, full frame
- 3380–5630 mm
- Best months
- Aug, Sep
- Peak altitude
- 74° from 50°N, 89° from 35°N