| Object: M109 (NGC 3992) | Date: 2019 February 24 |
| Type: Spiral galaxy | |
| Constellation: Ursa Major | Time & altitude: 22.15 UT 60º |
| Catalogue data: | Seeing (5 high): 3/5 |
| R.A: 11h 58m | Transparency (5 high): 4/5 |
| Dec: 53º 23 | Telescope: 0.5m f4.1 Dob. |
| Magnitude 9.8 | Eyepiece 8mm Ethos x260 |
| Size (mins) 8×5 | Filters: None |
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Notes: There is very little detail visible in this low-surface brightness galaxy. It has a round non-stellar nucleus set in a slightly oval core. The halo is very faint and it does not gain in brightness towards the centre. There are no details within it, no mottling. The W edge seems better defined than elsewhere. The halo is a 2:1 oval with the long axis NE-SW. There is a 12m star in the halo just N of the nucleus. |
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