| Designation(s) | Arp 76, M90, NGC 4569, IC 3583 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), Arp, IC, Messier, NGC |
| Arp Category | Spiral galaxies with small high surface brightness companions on arms |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Virgo |
| Date and Time Observed | 2024-03-13 13:32:42 |
| Instrument | 8" EdgeHD SCT |
| Camera | ASI294mc-Pro |
| Image Details | Up is 272.6 degrees E of N. Transparency: Good. Seeing: Good. Total integration time was 36m. Exposures 30s@375g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding.. |
| Description | The seventh of 9 entries added to the Messier catalog on March 8, 1781, also (#40) credited to Messier. "Nebula without star, in Virgo: its light is as faint as the preceding, No. 89." Halton Arp selected M90 for his Atlas of Peculiar Galaxies, categorizing "high surface companions on arms" as the peculiarity <--> Final observation of a very successful evening, completed around 1 AM. As expected for a Messier object, compared to most Arp galaxies, it is very bright. As Arp comments, IC 3583 is indeed a high surface brightness companion, though relatively distant from M90 compared to some other Arp "companions". Interactions are evident in the expansion and curvature towards IC 3583 of the NW arm, as well as a subtle dust lane that appears to connect them. This is much more evident in the inverted image compared to the color one. |
| Related Observations | M90 (2) |
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