NGC3718 and Hickson 56 in Ursa Major

This object was on my astroimaging target list since I remember. I am perfectly aware that imaging galaxies under suburban sky is pretty demanding task. I also know, that one clear night would be probably too less to achieve good outcome at such location. But at the end of March several clear nights have come, with both good transparency and good seeing. So I said to myself now or never, and took NGC3718 with NGC3729 and Hickson 56 group to the field of view of my imaging setup.

NGC3718 and Hickson 59
NGC3718/3729 pair and Hickson 56 group

NGC3718 (Arp 214) is a prominent galaxy classified as peculiar barred spiral. Its spiral arms are quite warped due to gravitational interactions with its close neighbor to the left – NGC3729. This latter object is barred spiral as well that lies about 150,000 light years away from NGC3718. This galaxy pair is about 50 million light year away from us and it is member of Ursa Major Cluster, that contains also M109 galaxy for example.

The group of five smaller galaxies below is Hickson 56 (Arp 322) galaxy group. These are about eight time more distant objects than NGC3718/3729 pair. Four of them appear to be interacting, fifth (Hickson 56A) is an edge on spiral galaxy.

The faintest captured objects here are about 23.5-24 mag. Most of them are rather distant galaxies, than Milky Way stars.

NGC3718/3729 pair and Hickson 56 - annotated
NGC3718/3729 pair and Hickson 56 – annotated

This small, distant faint fuzzies are usually best visible on inverted and stretched image.

NGC3718/3729 pair and Hickson 56 - full resolution inverted
NGC3718/3729 pair and Hickson 56 – full resolution inverted

Direct link to large version https://astrojolo.com/wp-content/uploads/2020/03/N3718tot_inv.jpg

Image technical data:
Date:       15-23 March, 2020
Location:   Nieborowice, Poland
Telescope:  Meade ACF 10"
Corrector:  AP CCDT67
Camera:     QHY163M, gain 100
Mount:      SW EQ6
Guiding:    Evostar 72 + ASI290MM
Exposure:   LRGB 460x2 minutes
Conditions: seeing good, transparency average

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