Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  34 P Cyg  ·  36 Cyg  ·  37 gam Cyg  ·  40 Cyg  ·  B343  ·  B344  ·  B347  ·  Crescent nebula  ·  HD190700  ·  HD190771  ·  HD190863  ·  HD191024  ·  HD191045  ·  HD191176  ·  HD191225  ·  HD191257  ·  HD191290  ·  HD191395  ·  HD191396  ·  HD191397  ·  HD191424  ·  HD191472  ·  HD191703  ·  HD192003  ·  HD192020  ·  HD192041  ·  HD192102  ·  HD192163  ·  HD192182  ·  HD192224  ·  And 829 more.
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Sadr Region Widefield - Butterfly and Crescent Nebulae, Gabriel R. Santos (grsotnas)
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Sadr Region Widefield - Butterfly and Crescent Nebulae

Getting plate-solving status, please wait...
Sadr Region Widefield - Butterfly and Crescent Nebulae, Gabriel R. Santos (grsotnas)
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Sadr Region Widefield - Butterfly and Crescent Nebulae

Equipment

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Acquisition details

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Description

An image of challenges: First of all, imaging a beautiful emission nebulous region as this one.... with an Ha blocking, unmodded DSLR. Second, the surrounding starfield is so dense, that bringing up the nebulosity is a really difficult task. Finally, the elevation of this object never rises above 30º from my location - I had to deal with some LP gradients during processing. Overall, though, I was somewhat surprised with this image- far from perfect, far from my best. But a nice capture of this beautiful region.

*Please check the full image 2400px - resized from original 6000px)*

Constructive criticism, comments and suggestions are more than welcome in the comments section. Thank's for taking your time to look at this image.

Taken from Rural Skies (Bortle 3-4; NELM ~6.2; SQM ~21.3*calculated), from Cristina, MG, Brazil (22ºS latitude).

Date and Time: September 16, 2017

Camera: Canon EOS T5 (unmodded), at ISO 800

Lens: Tamron 70-200mm f/2.8, operated at 200mm f/3.5

Mount: Sky-Watcher HEQ5, tracking, guided

Guiding: Starguider 50mm Guidescope + ASI120mm + PHD2; ~1.7" RMS

Exposure Detail: 20x240s (total 80min)

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Sadr Region Widefield - Butterfly and Crescent Nebulae, Gabriel R. Santos (grsotnas)