Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  NGC 4145  ·  NGC 4151  ·  NGC 4156
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NGC4151 & NGC4145, 


            Mathieu Guinot
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NGC4151 & NGC4145

Getting plate-solving status, please wait...
NGC4151 & NGC4145, 


            Mathieu Guinot
Powered byPixInsight

NGC4151 & NGC4145

Imaging Telescopes Or Lenses
GSO RC8" Carbon
Imaging Cameras
Zwo asi294mm pro
Avalon Instruments LINEAR
Antlia Ha 3.5nm 36mm · Antlia 36mm LRGB
ZWO EFW 36mm 7 Positions · OAG · Astro-Physics Inc 0.6x Focal Reducer
Photoshop CS5 · PixInsight 1.8.6
Guiding Telescopes Or Lenses
GSO RC8" Carbon
Guiding Cameras

Acquisition details

March 1, 2021 ·  March 28, 2021 ·  March 29, 2021 ·  March 30, 2021 ·  April 3, 2021
Antlia B 36mm: 60x120" (2h) bin 2x2
Antlia G 36mm: 60x120" (2h) bin 2x2
Antlia Ha 3.5nm 36mm: 108x300" (9h) bin 2x2
Antlia L 36mm: 318x120" (10h 36') (gain: 120.00) -15C bin 2x2
Antlia R 36mm: 60x120" (2h) bin 2x2
25h 36'
Avg. Moon age:
17.01 days
Avg. Moon phase:
Bortle Dark-Sky Scale:
Mean FWHM:

RA center: 12h10m11s.264

DEC center: +39°3557.98

Pixel scale: 0.912 arcsec/pixel

Orientation: 87.120 degrees

Field radius: 0.554 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 3571x2525

Locations: Home, Amiens, Somme, France

Data source: Backyard


Hi all!

Here is a couple of galaxies in the Hunting Dogs constellation: NGC 4151 on the left (nicknamed the Eye of Sauron by amateur astronomers because of its particular shape) and NGC 4145 on the right, located respectively 45 and 46 million light years.

NGC4151 is a Seyfert-type spiral with a very bright core but extremely weak and difficult to image arms, especially in city, visible here as a diffuse ring surrounding the heart of the galaxy.

Exposures through a hydrogen filter made it possible to highlight the brightest regions of nebulae in these two galaxies, especially interesting on NGC 4145.

The small spiral galaxy NGC 4156 just next to the Eye of Sauron is located more than 300 million light years away! its apparent size is only 1 arc minute but the details it shows are still very pretty. It seems to be interacting with another small galaxy that it joins by a star trail that is barely visible, but present.

A multitude of other small and distant galaxies and clusters of galaxies populate the sky background of this very rich area, more visible on the full resolution version than on Facebook.

25h30 of acquisitions in Amiens (Bortle 7 sky) in March 2021 with RC8 telescope on Avalon Linear mount + ASI294mm camera.

L: 318x120s with focal reducer APx0.67 (1050mm)

RGB: 60x120s each

Halpha: 69x300s for NGC4151 and 39x300s for NGC4145 without focal reducer (1600mm)

Hope you like this cosmic couple, clear sky to everyone!


Sky plot

Sky plot


NGC4151 & NGC4145, 


            Mathieu Guinot