H-NGC6934
Globular Cluster in Delphinus
About
A globular cluster in Delphinus, about 52,000 light-years away and roughly 90 light-years across. William Herschel found it in 1785. Its stars include dozens of RR Lyrae variables, and its orbit is unusually stretched. It is also in the Herschel 400 list.
Imaging tips
- At roughly 6′ across it is too small to frame: use a long focal length and a fine pixel scale.
- A globular cluster, so broadband filters suit it; a 6-hour luminance-plus-RGB set at 1,120 mm shows it filling only a small part of the frame.
- A plain, round cluster with no standout detail; a 32-minute stack at 1,600 mm already records it, with the stars as the interest.
- Best around July and August; it peaks near 47° from 50°N.
Facts
- Size
- 6′
- Magnitude
- 8.9
- Coordinates
- RA 20h 34.3m, Dec +7° 24′
- Framing, APS-C
- longer than 4000 mm
- Framing, full frame
- longer than 4000 mm
- Best months
- Jul, Aug
- Peak altitude
- 47° from 50°N, 62° from 35°N