Arp 31 / IC 167
| Designation(s) | Arp 31, IC 167 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), Arp, IC |
| Arp Category | Integral sign spiral galaxies |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Aries |
| Date and Time Observed | 2025-10-26 22:44:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 282.4 degrees E of N. Transparency: Fair. Seeing: Good. Total integration time was 51m 45s. Exposures 15s@225g, No Filter. Dithered and recentered in SharpCap. No guiding. |
| Description | Arp 31 is the first in the Atlas in a category for "integral sign" galaxies. Interestingly, the galaxy currently nicknamed the "integral sign" galaxy, UGC 3697, isn't one of them. Arp's remarks state, "High surface brightness irregularity is 5' N". North is roughly "right" in the image. I presume Arp is calling out the bright "kink" where the lower arm straightens out and descends vertically. In fact there are four bright bumps altogether as you travel the lower arm, and two more in the upper arm. Arp believes that galaxies regularly eject matter, so he doubtless expects these to be future ejecta. |
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