H-NGC7217
Galaxy in Pegasus
About
A galaxy in Pegasus roughly 50 million light-years away, with several rings of stars around its nucleus. Some of its stars orbit in the opposite direction to the rest, a sign of a past merger, and it now has no major companions. It is in the Herschel 400.
Imaging tips
- Only about 4′ × 3′, so it is too small to frame: use a long focal length and a fine pixel scale.
- At 21.4 mag/arcsec² the surface brightness is moderate, and a galaxy needs broadband data.
- One imager with a 14-inch f/10 scope took 4 × 10 minutes of luminance, plus RGB; his page describes the spiral-looking filaments fading and then turning blue further out.
- Best around August and September; it peaks near 71° from 50°N.
Facts
- Size
- 4′ × 3′
- Magnitude
- 10.1
- Coordinates
- RA 22h 7.9m, Dec +31° 22′
- Framing, APS-C
- longer than 4000 mm
- Framing, full frame
- longer than 4000 mm
- Best months
- Aug, Sep
- Peak altitude
- 71° from 50°N, 86° from 35°N