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Object: ARP 81 (NGC 6621 & NGC 6622) |
Date: 2015 August 22
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| Peculiarity: Spiral: large high surface-brightness component on arm. | |
| Constellation: Draco | Time & altitude: 23.20 UT 61º |
| Catalogue data: | Seeing (5 high): 3/5 |
| R.A: 18h 13m | Transparency (5 high): 3/5 |
| Dec: +68º 22 | Telescope: 0.5m f4.1 Dob. |
| Magnitudes: 13.6 & 16.0 | Eyepiece: 8mm Ethos x260 |
| Galaxy sizes: 2 x 1 & 0.5 x 0.4 | Filters: None. |
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Notes: This object is aligned NW-SE. The NW component (NGC 6621) is easily the larger and brighter. The most striking feature is a clear diagonal separation between the two components, a bit like the main dust lane crossing M82. A haze seen a little distance S on the same NW-SE axis in fact seems to be due to four unresolved stars when I compare to a CCD image. Arp’s filament on the NE side was not seen. |
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