Sh2-86
HII Region in Vulpecula
About
A large emission nebula in Vulpecula, about 6,000 light-years away, that surrounds the young open cluster NGC 6823. Sources give its width as about 40′. Light from the cluster's stars is pushing the gas outward into pillar-like columns.
Imaging tips
- At 810–1350 mm on APS-C (1240–2060 mm full frame) the nebula spans a large part of the frame, and NGC 6823 sits only 4.3′ away at its heart.
- Sources give about 40′ across, so a wide field is needed; M27 sits about 3° away, east of it, if you plan a wider mosaic.
- One imager built a luminance layer from 140 minutes of Hα (7 × 20 minutes) and added 30 minutes each of red, green and blue.
- Sources differ on the name NGC 6820: Wikipedia applies it to the whole nebula, while two imagers' pages use it for a small flaring patch near the cluster.
- Best in July; it peaks near 63° altitude from 50°N.
Facts
- Size
- 30′
- Magnitude
- —
- Coordinates
- RA 19h 43.2m, Dec +23° 15′
- Framing, APS-C
- 810–1350 mm
- Framing, full frame
- 1240–2060 mm
- Best months
- Jul
- Peak altitude
- 63° from 50°N, 78° from 35°N
Nearby
- H-NGC6823 · 4.3′ away