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Planetary Nebula
Messier 97, Owl Nebula


Object : M97, Owl Nebula
Coordinates/Direction : center of image, RA 11h15m, Dec +54 55'
Object size : 202" by 196"
Object magnitude : 9.9
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Owl Nebula

M97 2023-10-13, crop

M97 Owl Nebula, 2023 (Click on image to get one in full resolution in a new window)
Date : 2023-10-13
Time (UT) : 00:07 - 01:17
Mount : SkyWatcher HEQ5 controlled by Astroberry
Guide : Ekos internal guider in dithering mode, 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 degree, before cropping
Filter : none
camera : Canon 6D, controlled by Astroberry software
Film/CCD : Raw
Exp. time : 44x60 seconds, iso1600
Image process tool : Siril, Gimp, Irfanview
Processing : cal bias, flat and astro metric color calibration
Weather : Thin clouds 25% during night
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
Comment : Planetary nebulas are small objects, a few arc minutes wide. It's preferable to have long focal lengths, 2000 mm or so. In this case I use my 300 mm lens. Other exciting objects can be identified on this plate solved image: M97 Astrometry.

M97 2023-10-13, crop & Zoom 2x

M97 Owl Nebula, 2023
Date : 2023-10-13
Time (UT) : 00:07 - 01:17
Comment : Zoom in at 2x on the cropped image and crank up the color saturation. The color is easy to see but very noisy. A 3 hour exposure had been better. Planetary nebulas is the left over from an exploded star, the stars particles are like a big cloud where the once was. Compare with photos below taken with different focal lenghts.

M97 2020-01-22, TS130 910 mm

M97 TS130 910mm f/7, 2020
Date : 2020-01-22
Time (UT) : 20:32 - 22:40
Mount : EQ6 Synscan and EQMOD controlled
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Altair 3" field flattener 1x
Field (FOV) : 2.25x1.5 degree, before cropping
Filter : none
camera : Canon EOS 6D, controlled by APT software
Film/CCD : Raw
Exp. time : 60 x 60 seconds + 16 x 120 seconds at ISO1600 (HDR)
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Flat calibrated, high contrast, gamma 5, level, color, noise filter
Weather : Clear sky
Site : Stockholm, Sweden, Hagsätra. Bortle class 9
Comment : This night the sky was darker than what I normally have. See how the noise goes down. This is the whole field that the telescope deliver to a full frame camera, 3 x 2 degrees, as you see the planetary nebula is very small. The image consist of two different exposures times to achieve a better dynamic, HDR photo.

M97 2020-01-22, Zoom in

M97 TS130 910mm f/7, 2020
Date : 2020-01-22
Time (UT) : 20:32 - 22:40
Comment : Zoom in on the M97 Planetary Nebula and the galaxy M108. The back ground is much better this time, less light pollution and a noise filter applied in the image process.

M97 2019-01-20, TS130 910 mm

M97 TS130 910mm f/7
Date : 2019-01-20
Time (UT) : --
Mount : EQ6 Synscan and EQMOD controlled
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Altair 3" field flattener 1x
Field (FOV) : 2.25x1.5 degree, before cropping
Filter : none
camera : Canon EOS 6D, controlled by APT software
Film/CCD : Raw
Exp. time : 228x30 second ISO1600
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : crop 1:1, resize, stretch, flatten
Weather : Clear sky
Site : Stockholm, Sweden, Hagsätra. Bortle class 9
Comment : New test, this time I reduce the sub image exposure to 30 second and took 228 photos of the object. It looks very noisy, better to try ISO 1600 or ISO3200 next time which give lower readout noise, but will also reduce the dynamic range a lot. A telescope with a focal length of 2000 mm had also been good.

M97 2017-12-21, TS130 910 mm

M97 TS130 910mm f/7
Date : 2017-12-21
Time (UT) : --
Mount : EQ6 Synscan and EQMOD controlled
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Altair 3" field flattener 1x
Field (FOV) : 2.25x1.5 degree, before cropping
Filter : none
camera : Canon EOS 6D, controlled by APT software
Film/CCD : Raw
Exp. time : 65x60 second ISO800 + 21x60 second ISO1600 (HDR)
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : crop 1:1, resize, stretch, flatten
Weather : a bit foggy but otherwise clear
Site : Stockholm, Sweden, Hagsätra. Bortle class 9
Comment : My first image with my new setup with the 3" field flattener. Not very big success with the cleaning of the sensor, no flat field calibration at this stage.
A planetary nebula is the left over from an old stellar explosion. The galaxy upper right corner is M108.

M97 2017-12-21, TS130 910 mm

M97 TS130 910mm f/7 crop
Comment : With a noise filter and flatten of the background it looks like this

M97, TS130 682 mm, test with three different lenses, test 1.

M97 TS130 683mm f/5.3
Date : 2015-11-21
Time (UT) : --
Mount : EQ6 Synscan and EQMOD controlled
Lens/telescope : TS130, 910 mm f/7 (682 mm, f/5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
Field (FOV) : 3x2 degree, before cropping
Filter : none
camera : Canon EOS 6D, controlled by APT software
Film/CCD : Raw
Exp. time : 22x60 second, ISO800
Image process tool : Fitswork, Irfanview
Processing : crop, resize, stretch, flatten
Weather : clear
Site : Stockholm, Sweden, Hagsätra. Bortle class 9
Comment : Three test photos with three different lenses and telescope. shot from my balcony, very light polluted sky.
A planetary nebula is the left over from an old stellar explosion. The galaxy upper right corner is M108.

M97, Pentax 500 mm, test with three different lenses, test 2.

M97 Pentax 500mm f/4.5
Date : 2013-11-28
Time (UT) : --
Lens/telescope : Pentax 500mm f/4.5
Field (FOV) : 4.1x2.7 degree, before cropping
camera : Canon EOS 5D
Film/CCD : Raw
Exp. time : 30x60 second, ISO1000

M97, Pentax 165 mm, test with three different lenses, test 3.

M97 Pentax 165mm f/2.8
Date : 2013-11-25
Time (UT) : --
Lens/telescope : Pentax 165mm f/2.8
Field (FOV) : 12x8 degree, before cropping
camera : Canon EOS 5D
Film/CCD : Raw
Exp. time : 25x30 second, ISO1000
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