Astrofriend's homepage

www.astrofriend.eu

You are here: Home> Astronomy> Astrophotography> Galaxies> NGC 4236

Search Astrofriend's homepage:

Navigation Home English News Travel Astronomy Dictionary Calculations Adapters and threads Links Astrophotos Science data Meteorite Craters Observatory Sites Projects Tutorials Equipment Articles, Seminars, Reports Historier Mörka platser Stockholm Objects seen from Sweden Vehicles 3D Printing Technique Photography Sound & Image Links About me Cookies / GDPR Contact Svenska Konst Astronomi historier Historia Sverige Nöjen i Stockholm Beg. till Salu

Galaxy NGC 4236 Caldwell 3

Object :	NGC 4236 (Caldwell 3)
Coordinates/Direction :	RA: 12h16m, DEC: +69o27'
Object size :	21.9' x 7.2'
Apparent magnitude :	10.5
Distance :	14.5 Mly
No solar mass :	-
Type :	SB
Discovered by :	William Herschel, year 1793
Find in constellation :	Draco
More to know :	Wikipedia: https://en.wikipedia.org/ wiki/ NGC_4236

NGC 4236, 2025-12-21 (Click on the image and get the full resolution one in a new window)

Date :	2025-12-21
Time (UT) :	20:16 to 22:15

Exp. time :	45x120 seconds at ISO400, dithering every 3rd image
Image process tool :	Siril, Graxpert, VeraLux, Irfanview
Processing :	flat and photo metric color calibration, dark subtraction, stretch
Weather :	Clear sky, Moon phase 3%, clear sky, Temperature +4o C

Comment :

This time I increase the sub exposure time to 120 sec in a try to get something out from the galaxy. Still it hide in the dark and I try to increase the contrast the color colapsed. Need at least 8 hour of exposure with this setup.

NGC 4236, 2025-11-17 (Click on the image and get the full resolution one in a new window)

Date :	2025-11-17
Time (UT) :	21:56 to 23:26

Exp. time :	60x60 seconds at ISO400, dithering every 3rd image
Image process tool :	Siril, Fitswork, Irfanview
Processing :	flat and photo metric color calibration
Weather :	Clear sky, Moon phase 7%, clear sky, Temperature -1o C

Comment :

On the limit to be detected, at a magnitude of 10.5 it need at least 5 hour of exposure with a f/7 telescope.

NGC 4236 multi stack, 2024-11-22 + 2024-12-10 + 2024-12-12 + 2024-12-20 + 2024 (Click on the image and get the full resolution one in a new window)

Date :	2024-11-22 + 2024-12-10 + 2024-12-12 + 2024-12-20 + 2024
Time (UT) :	- : -

Exp. time :	253x60 seconds at ISO1600, dithering every 3rd image
Image process tool :	Siril, Graxpert, VeraLux, Irfanview
Processing :	flat and photo metric color calibration, dark subtraction, stretch
Weather :	Rel Humidity -%, Moon phase 3%, Temperature ?o C

Comment :

Here are four different nights stacked together. More than 4 hours together. A little bit better.

NGC 4236, 2024-11-22

Date :	2024-11-22
Time (UT) :	21:58 to 23:14

Exp. time :	59x30 seconds at ISO400, dithering every 3rd image
Image process tool :	Siril, Fitswork, Irfanview
Processing :	flat, photo metric color calibration, crop 760x717 pixel 1:1 scale
Weather :	Moon phase 56%, clear sky, temperature -8o C

Comment :

A test on this galaxy once again, now with the Nikon camera and the FA lens. But from a Bortle 9 area this weak galaxy is hopeless.

NGC 4236, 2022-03-04 (click on the image to get a full resolution photo in a new window)

Date :	2022-03-04
Time (UT) :	23:10 to 23:05

Exp. time :	30x30 seconds at ISO1600, dithering mode
Image process tool :	Siril, Fitswork, Irfanview
Processing :	level, cal bias dark flat, dithering
Weather :	clear sky

Comment :

More test on the roof balcony, much better view from here compare to our balcony. The hole Western hemisphere is open for me. Most important I can view objects at high latitude. Now with more photos to stack and later at night I got a more darker sky and the galaxy is easier to see.

NGC 4236, 2022-01-21 (click on the image to get a full resolution photo in a new window)

Date :	2022-01-21
Time (UT) :	18:56 to 19:14

Exp. time :	8x30 seconds at ISO1600, dithering mode
Image process tool :	Siril, Fitswork, Irfanview
Processing :	level, cal bias dark flat, dithering
Weather :	clear sky

Comment :

Just a few images to stack to see if there is any trace of the galaxy, and yes you can see it but not more.

Go Back to content

Go Back

Advertisement / Annons:

Page best viewed with screen set to 1024x768 or higher. The pictures that are labeled Lars Karlsson, text and web page designs are © Copyright 2002 - 2026 by Lars Karlsson. All rights reserved. They may not be reproduced, published, copied or transmitted in any form, including electronically on the Internet or World Wide Web, without written permission of the author.

Home: http://www.astrofriend.eu/