H-NGC7086
Open Cluster in Cygnus
About
An open cluster in Cygnus, about 4,200 light-years away, with an age estimated at 130 to 140 million years. William Herschel discovered it in 1788, and it is in the Herschel 400.
Imaging tips
- About 9′ across, so it fills a third to half of the frame at 2690–4490 mm on APS-C.
- One imager used a 10-inch telescope and a mono camera for LRGB, with 50, 30, 20 and 25 frames of 60 s each, on two nights.
- That imager felt the stars came out too blue and suspected the colour balance, so check star colours when you calibrate.
- It sits in a well-visited part of the sky but is rarely imaged.
- Best in July and August; it passes almost overhead, peaking near 88° from 50°N.
Facts
- Size
- 9′
- Magnitude
- 8.4
- Coordinates
- RA 21h 30.5m, Dec +51° 36′
- Framing, APS-C
- 2690–4490 mm
- Framing, full frame
- longer than 4000 mm
- Best months
- Jul, Aug
- Peak altitude
- 88° from 50°N, 73° from 35°N