| Object: ARP 7 (MCG-3-23-9) | Date: 2016 April 6 |
| Peculiarity: Spiral with split arm. | |
| Constellation: Hydra | Time & altitude: 21.15 UT 19º |
| Catalogue data: | Seeing (5 high): 4/5 |
| R.A: 8h 50m | Transparency (5 high): 4/5 |
| Dec: -16º 35 | Telescope: 0.5m f4.1 Dob. |
| Magnitude: 14.5 | Eyepiece: 8mm Ethos x260 |
| Galaxy size (mins): 1.3 x 1 | Filters: None |
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Notes: Megastar 5.0 mis-identifies this galaxy as MCG+3-23-9 and takes you into Cancer. Use the MCG number. Seen 90 minutes after meridian transit and so low in the sky. Arp 7 was easily visible despite being 14.5m. It must be very high surface brightness. There is a stellar core set in an even, slightly oval halo aligned NW-SE. Compare the visibility of this object with Arp 263 seen the same evening. |
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