Nebula
Messier 1, Crab Nebula

Object :	M1, Crab Nebula
Coordinates/Direction :	RA: 05h34m, DEC: +22^o00'
Object size :	7' x 5'
Object magnitude :	8.4
More to know :	Wikipedia: https://en.wikipedia.org/ wiki/ Crab Nebula

M1 2023-10-16

(click on the image to get one in full resolution)

Date :	2023-10-16
Time (UT) :	21:33 to 22:12

Mount :

SkyWatcher HEQ5, belt modified, low rider

Guide :

QHY5 camera with 200 mm f/3.5 lens

Lens/telescope :	Pentax 645 300 mm ED f/4 (medium format lens)
Corrector/Barlow :	-
Field (FOV) :	6.8x4.5^o (full frame) before crop

camera :	Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature:	About 6^o C above surrounding temperature
Film/CCD :	Raw, Cr2
Filter :	none

Control system:

Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux)

Exp. time :	28x60 seconds, iso1600, dithering mode
Image process tool :	Siril, Gimp, Irfanview
Processing :	cal bias, flat astrometric color cal
Weather :	clear

Site :

Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20^o-90^o, 165^o-185^o, La: 20^o-55^o

Comment :

The first object on Messier's list, the Crab Nebula. It has a diameter of 11 ly but at a distance of 6500 ly it looks very small even in a big telescope. What we see is a gas cloud after a star that exploded 1054 observed by Chinese astronomers. Surrounding objects can be seen on this plate solved image: M1 Crab nebula Astrometry. Later I will use my bigger refractor and take new images, then some details shoud be visible.

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Nebula Messier 1, Crab Nebula

M1 2023-10-16

Nebula
Messier 1, Crab Nebula