Sh2-249
HII Region in Gemini
About
A faint cloud of glowing hydrogen in Gemini, about 5,200 light-years away. It is a separate emission nebula from IC 443, the Jellyfish Nebula, a supernova remnant about 5,000 light-years away that shares the same patch of sky.
Imaging tips
- At 300–500 mm on APS-C (460–770 mm full frame) the nebula, about 80′ across, takes up much of the frame.
- It is an emission nebula, so Hα or other narrowband data suits it better than plain RGB.
- Cr89 lies about 74′ away, nearby rather than in the same field.
- Best in December and January; it peaks near 63° altitude from 50°N.
Facts
- Size
- 80′
- Magnitude
- —
- Coordinates
- RA 6h 22.6m, Dec +22° 59′
- Framing, APS-C
- 300–500 mm
- Framing, full frame
- 460–770 mm
- Best months
- Jan, Dec
- Peak altitude
- 63° from 50°N, 78° from 35°N
Nearby
- Cr89 · 74.2′ away