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Messier 1, Crab Nebula

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

M1 2023-10-16

M1 Crab Nebula, 2023 (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) : 6.8x4.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o 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: 20o-90o, 165o-185o, La: 20o-55o
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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