| Object: ARP 224 (NGC 3921) | Date: 2017 April 20 |
| Peculiarity: Amorphous spiral arms. | |
| Constellation: Ursa Major | Time & altitude: 00.40 UT 65º |
| Catalogue data: | Seeing (5 high): 3/5 |
| R.A: 11h 51m | Transparency (5 high): 2 to 3/5 |
| Dec: 55º 05 | Telescope: 0.5m f4.1 Dob. |
| Magnitude: 12.5 (but see notes) | Eyepieces: 17mm Ethos x120 8mm Ethos x260 |
| Galaxy size (mins): 2.1 x 1.3 | Filters: None. |
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Notes: Sky transparency fluctuating, apparently due to thin patches of high-level haze drifting through. A difficult object. Megastar lists the magnitude as 13.1. Seen as a round mist brightening moderately toward the centre but with without a nucleus. There is a fainter fan of luminosity extending to the S. No structure is visible. NGC 3916 (14.7m) is nearby to the N, a thin splinter of light. The view was slightly better in the 17mm eyepiece than in the 8mm. |
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