H-NGC2841 — Tiger's Eye Galaxy
Galaxy in Ursa Major
About
A tightly wound, unbarred spiral in Ursa Major, the prototype of the flocculent class, with patchy, broken arms. It lies about 46 million light-years away and spans roughly 150,000 light-years. Its disk warps about 98,000 light-years out, perhaps from infalling matter, and four supernovae have been seen in it since 1912. It is in the Herschel 400.
Imaging tips
- About 8′ × 4′: 3030–5050 mm on APS-C frames it, so it needs a long focal length.
- Surface brightness is 21.6 mag/arcsec², and its arms are patchy, so broadband data in long totals suit it; one imager logged 31 hours.
- That 31-hour image used an 8-inch Ritchey-Chrétien, a luminance filter plus RGB filters.
- Another imager used a one-shot colour camera behind only a UV/IR cut filter.
- Best around January and February; it passes almost overhead, near 89°, from 50°N.
Facts
- Size
- 8′ × 4′
- Magnitude
- 9.2
- Coordinates
- RA 9h 22.0m, Dec +50° 59′
- Framing, APS-C
- 3030–5050 mm
- Framing, full frame
- longer than 4000 mm
- Best months
- Jan, Feb
- Peak altitude
- 89° from 50°N, 74° from 35°N