| Object: ARP 18 (NGC 4088) | Date: 2015 May 13 |
| Peculiarity: Spiral with detached segments. | |
| Constellation: Ursa Major | Time & altitude: 00.00 UT 59º |
| Catalogue data: | Seeing (5 high): 3/5 |
| R.A: 12h 06m | Transparency (5 high): 3/5 |
| Dec: +50º 32 | Telescope: 0.5m f4.1 Dob. |
| Magnitude: 10.5 | Eyepiece: 17mm Ethos x120 8mm Ethos x260 |
| Galaxy size (mins): 5.8 x2.3 | Filters: None. |
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Notes: A gem! More impressive than M109 lying 3º to the N. The 17mm eyepiece gives the better view. Elongated NE-SW. Lots of structure suggests an inclined spiral with a warped disk. There is a large core surrounded by dark lanes and mottling all through the halo. The detachment of the ‘detached segment’ was not really seen however. NGC 4085 (13.0m, 3’ x 1’) is easily visible in the same field 11’ S of 4088 but surprisingly is not part of the Arp Atlas object. It is like a ghost or reflection of 4088. It is an irregular tapered patch elongated EW and narrowing to the E. |
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