Arp’s Peculiar Galaxies
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Arp observations 91-94 of 94 total to date.
| Thumbnail | Title/link | Arp Category | Date Observed | Observer Description |
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Arp 331 / NGC 383 | Chains of galaxies | 2023-12-06 22:00:06 | This is a very rich galaxy-field. Besides the galaxy cluster that Arp labels, I counted 12 additional galaxies by eye. The Astrometry.net annotation is so cluttered that it's very challenging to read. Included as part of Arp 331 are NGC 383 (central galaxy), 379, 380, 382, 384, 385, 386, and 388. Additional galaxies within the field of view include: NGC 370, 373, 374, 375, 392, 397, 398, 399, 400, 402, 403 plus IC 1614, 1618, 1619. This means the annotation found at least 2 galaxies I didn't count by eye, presumably the IC galaxies (IC 1614 is 17th magnitude). This observation was part of the December 2023 Cloudy Nights EAA Challenge, which is why I observed it when I did. |
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Arp 333 / NGC 1024 | Miscellaneous galaxies | 2024-12-25 23:23:00 | This is an enigmatic cluster of 3 galaxies, showcased by NGC 1024. Arp included NGC 1024 in his Atlas, and classified it as miscellaneous/unique for the thin spiral arms connecting to dwarf galaxies? at its periphery (bottom left and mid-left in the comparison image). NGC 1029 is likely gravitationally bound to 1024, but 1028 is substantially further away as suggested by its smaller size, and confirmed by a much higher red-shift. |
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Arp 336 / Helix Galaxy | Miscellaneous galaxies | 2022-12-20 20:30:13 | This was captured very early in my EAA career... I'd had less than 30 days of successful captures. This is a relatively small target which tested the limit of my reduced C9.25 SCT, particularly because I was observing from a not terribly rigid deck the required 10s exposures in SharpCap. By appearances, this is a very conventional spiral galaxy with the exception of the bulge below and to the right. It does not seem to be a merger, as the disk is not distorted. It does appear to be an exchange of materials from one part of the disk to another. I presume Arp didn't know what to make of it either since he categorized it as miscellaneous. |
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Arp 337 / Cigar Galaxy / M82 | Miscellaneous galaxies | 2024-02-19 20:23:00 | This is another very bright and familiar target, though most of my experience has been wide field captures of the M81 Group. The broad outlines of the galaxy are immediately obvious, but the details of venting and the disruption of the galactic center emerge much more slowly. |