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Galaxy NGC 2403 Caldwell 7

Object :	NGC 2403
Coordinates/Direction :	RA: 07h36m, DEC: +65o36'
Object size :	22' x 12'
Apparent magnitude :	8.9
Distance :	9.65 Mly
No solar mass :	-
Type :	SAB
Discovered by :	William Herschel, year 1788
Find in constellation :	Camelopardalis
More to know :	Wikipedia: https://en.wikipedia.org/ wiki/ NGC 2403

NGC 2403, 2025-11-17 (Click on the image and get the full resolution one in a new window)

Date :	2025-11-17
Time (UT) :	20:05 - 21:02

Exp. time :	59x60 seconds, iso400, dithering every 3rd
Image process tool :	Siril, Gimp, Irfanview
Processing :	flat, photometric color calibration
Weather :	Clear sky, Moon Phase 3%, Temperature 0o C

Comment :

A weak galaxy that need a lot more of exposure, at least three hours.

NGC 2403, 2024-09-14 (Click on the image and get the full resolution one in a new window)

Date :	2024-09-14
Time (UT) :	22:04 - 23:06

Exp. time :	59x60 seconds, iso400, dithering every 3th
Image process tool :	Siril, Gimp, Irfanview
Processing :	flat, photometric color calibration
Weather :	clear sky, temperature +14o C

Comment :

One more image with the Nikon D800 camera and the Pentax FA lens.

NGC 2403 long exposure, 2023-10-04 to 2023-10-12 (Click on the image and get the full resolution one in a new window)

Date :	2023-10-04 to 2023-10-12
Time (UT) :	-

Exp. time :	154x60 seconds, iso1600, dithering mode
Image process tool :	Siril, Gimp, Irfanview
Processing :	crop, resize, level, cal dark, bias, flat, photometric color calibration
Weather :	clear sky

Comment :

A new attempt with 2.5 hours exposure from three nights to bring the noise down. Better but far from okay.

NGC 2403 2023-10-05 (Click on the image and get the full resolution one in a new window)

Date :	2023-10-05
Time (UT) :	21:07 to 22:22

Exp. time :	60x60 seconds, iso1600, dithering mode
Image process tool :	Siril, Gimp, Irfanview
Processing :	crop, resize, level, cal dark, bias, flat, photometric color calibration
Weather :	clear sky

Comment :

A new attempt at a night without the Moon. I really need my bigger refractor for this object. There ore other objects, even smaller to examine in the full resolution image. Have a look here at the plate solved image: NGC 2403 Astrometry plate solved.

NGC 2403 2023-09-30 (Click on the image and get the full resolution one in a new window)

Date :	2023-09-30
Time (UT) :	20:31 to 21:46

Exp. time :	60x60 seconds, iso1600, dithering mode
Image process tool :	Siril, Gimp, Irfanview
Processing :	cal bias, flat, photometric color calibration
Weather :	clear sky, Moon

Comment :

Last September the spiral galaxy NGC 2403 was in correct position for a photo. It's an outlaying member to the M81 group. It's a small galaxy for my wide angle optic of 300 mm.

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