File:Butterfly nebula.jpg
Original file (8,283 × 5,606 pixels, file size: 27 MB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionButterfly nebula.jpg |
English: sh2-108 is often called the Gamma Cygni (Sadr) nebula or even Sadr region because of the foreground appearance of the supergiant star. However, this is an optical illusion: this nebula lies far beyond Gamma Cygni/Sadr in the depths of the Cygnus X complex of star formation regions. Sadr itself lies at a distance of ~1500 light years.
The small open cluster of stars above Sadr in the top middle is NGC6910. This cluster however may be located within the nebula itself, as it is at a similar distance of ~3700 light years beyond the galactic Great Rift (the dark band of interstellar clouds of cosmic dust obscuring the middle of the Milky Way, including the stellar association Cygnus OB9, whose core cluster comprises NGC6910). Apparently the dust in front dims the light from the open cluster by more than one magnitude. Still, this 2.2 magnitude object resembling a butterfly shape (and is sometimes also called that) shows off a number of both emission and dark nebulae. This is my first image after a long hiatus, since 2022 was very busy for me. Thankfully, sh2-108 was a relatively straight-forward target, very bright even though I put in some good time on it which helps with noise control and also weighting of images. Even though I've been busy with sciencing the past summer, the weather was not cooperative: there was lot of rain and clouds and the seeing was terrible. So having a lot of exposures helps with improving quality. I avoided doing this target in the past because there's a much larger context that is beautiful and maybe best done with a wide field lens or as a composite but given my time availability, I chose to do the path of least resistance here. The first image (A) is a Ha only image (https://www.astrobin.com/nm6fwk). The second (B) is the PixInsight processed image, quite minimal, using the Ha for the L image. I tried a composite L from the mono S2, Ha, and O3 data but Sadr really showed up brightly (due to the O3 signal) and decided this was the better route. I also further processed the PixInsight image in TopazStudio 2 (C - minimal and D). As usual, the processing in C and D looks aesthetically great from far away but if you zoom in, you can see the compromises made to achieve the better look. |
Date | |
Source | Own work |
Author | Ram samudrala |
Camera location | 43° 16′ 12″ N, 79° 01′ 12″ W | View this and other nearby images on: OpenStreetMap | 43.270000; -79.020000 |
---|
Total integration: 1942 minutes/32.4 hours (98 x 300s or 11.43h for Ha + 96 x 300s or 11.20h for O3 + 84 x 300s or 9.80h for S2).
Cameras: QHY294M (11mp mono) CMOS cooled to -15 degrees C. Telescopes: Stellarvue SV70T triplet apochromat refractor @ f/4.8. Reducers: SFFR70-APO (0.8x). Mount: Paramount MyT. Filters: 1.25" Astrodon 5nm Ha, 3nm O3, and 3nm S2. Software: TheSkyX Pro, SharpCap, PixInsight, Topaz Studio 2.
Also includes NGC6910.
Licensing
[edit]- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This file was uploaded as part of Wiki Science Competition 2023. |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 08:57, 15 December 2023 | 8,283 × 5,606 (27 MB) | Ram samudrala (talk | contribs) | Uploaded own work with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Horizontal resolution | 72 dpi |
---|---|
Vertical resolution | 72 dpi |
Software used | Topaz Labs |