NGC 4725 in the Coma I Group, LRGB, 4 Apr 2020 (David Dearden)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: NGC 4712 · NGC 4725 · NGC 4747

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NGC 4725 in the Coma I Group, LRGB, 4 Apr 2020

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NGC 4725 in the Coma I Group, LRGB, 4 Apr 2020

40 ± 6 MLy

I had a clear night that enabled me to capture C/2019 Y4 ATLAS, but as the Moon sank lower this target presented itself; my last try was in 2016 so I was sure I could do better than then. This galaxy has one of the more interesting shapes I’ve observed, a single spiral arm extending from a more central ring. This really looks like a tidal stream to me. The smaller galaxy to the lower right, NGC 4747, also has a nice tidal stream; it almost looks like a cosmic skid mark on the sky. There was a goodly amount of background sky fog in this image, which I have mostly darkened out. I haven’t compared with enough other images to decide whether or not it might be real.

Date: 3-4 Apr 2020

Subject: NGC 4725 and vicinity

Scope: AT8IN+High Point Scientific Coma Corrector

Filters: ZWO 31 mm diameter unmounted L, R, G, B

Mount: EQ-6 (EQMOD 2.000j)+PEC

Guiding: Orion Thin Off-axis Guider + ASI120MM-mini +PHD 2.6.7 (Win 10 ASCOM)

Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21

Acquisition: Sequence Generator Pro 3.1.0.457

Exposure: 20x180 R, 20x180 G, 60x180 L, 20x180 B

Stacking: Deep Sky Stacker 4.2.3 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5 (see above!).

Processing: StarTools 1.6.392 beta: Software binned L 2x2, cropped, wiped, developed, HDR (reveal all), untrack denoised (grain equalization). Combined R, G, & B in StarTools. Software binned L 2x2, cropped, wiped, developed, HDR (reveal all), color with a lot of saturation boost, untrack denoised (grain removal). Applied L to color in Photoshop. Several rounds of levels and curves, and several of deep space noise reduction. AstroFrame.

Image the Universe
ZWO ASI1600MM/QHY163M

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Status	Advanced success
Started	...
Astrometry.net job	3387145
PixInsight job	9WVCZC2A620Z6909L1IJNQA9MG38PRRJ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	12h50m43s.64
RA (top/left)	12h48m18s.26
RA (top/right)	12h53m05s.32
RA (bottom/right)	12h53m09s.97
RA (bottom/left)	12h48m20s.93

Dec (center)	+25°37′43″.7
Dec (top/left)	+25°13′16″.10
Dec (top/right)	+25°12′11″.6
Dec (bottom/right)	+26°02′00″.1
Dec (bottom/left)	+26°03′07″.3

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NGC 4725 in the Coma I Group, LRGB, 4 Apr 2020

NGC 4725 in the Coma I Group, LRGB, 4 Apr 2020

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NGC 4725 in the Coma I Group, LRGB, 4 Apr 2020

NGC 4725 in the Coma I Group, LRGB, 4 Apr 2020

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