NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?) (Alex Woronow)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: NGC 4485 · NGC 4490 · PGC 2184099 · PGC 2185016 · PGC 2185391 · PGC 2185640 · PGC 2186780 · PGC 2187250

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NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?)

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NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?)

NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?)

OTA: CDK 17
Camera: SBIG STXL11002
Observatory: Owned by Barnard Miller, NM
Date of Capture: May 21
Date of Processing: May 24

Exposures Used:
R: 15 x 1200 sec
G: 16 x "
B: 8 x "
H: 20 x 1200 sec
Total Exposure time: 19.7 hours
Image Width: 25' 52"

Processing Tools:
1.   Commercial: PixInsight, Topaz, Radiant Photo, 3DLUT Creator
2.   Pixinsight Addons: NoiseXTerminator, BlurXTerminator, StarXTerminator
3.   My Scripts: AC_Restar, Subframe Weighting Tool (Excel w/ J. Hunt), ColorTweaker

Target Description:
NGC 4490 is described as a "barred Spiral" galaxy. Frankly, I cannot even tell if it presents edge- or face-on. It is severely gravitationally tidally distorted as it begins a merger spiral with its smaller companion galaxy NGC 4485, which lies to the left of the central galaxy in this image. Below NGC 4490 in this image lies a faint grouping of stars of considerable breadth. This, most likely, is a gravitational tail caused by the two-galaxy interaction. It has the appearance of being partially hidden behind NGC 4490…what do you think? Regardless of what or where it is, few images of this system reveal this feature.

Processing Description:
Although many luminance subs were provided, and luminance can reduce noise, AI noise reduction does nose-reduction better. Therefore, more than 8 hours of L subs were not used. However, the blue subs were not completed when my subscription to this scope expired, so I had to make do with about half as many as there were red and green subs.

Target Statistics:
Distance: 25.1M ly
Apparent Magnitude: 9.8
Pixel Resolution: 0.9"
Pixel Span at Target: 1E14 km

Alex Woronow

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Status	Advanced success
Started	...
Astrometry.net job	9839936
PixInsight job	EOZSS1822RS0TDUZIYU6ZL3EKE4TYPWL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h30m33s.899
RA (top/left)	12h29m11s.766
RA (top/right)	12h29m41s.374
RA (bottom/right)	12h31m56s.173
RA (bottom/left)	12h31m27s.334

Dec (center)	+41°38′45″.55
Dec (top/left)	+41°48′38″.17
Dec (top/right)	+41°23′24″.25
Dec (bottom/right)	+41°28′51″.18
Dec (bottom/left)	+41°54′07″.62

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NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?)

NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?)

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NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?)

NGC 4490 With a Seldom Revealed Gravitational Tail—Maybe(?)

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