The Elephant's Trunk nebula is a concentration of interstellar gas and dust within the much larger ionized gas region IC 1396 located in the constellation Cepheus about 2,400 light years away from Earth.
This cosmic elephant's trunk is over 20 light-years long. The false-color view was recorded through narrow band filters that transmit the light from hydrogen (in green), sulfur (in red), and oxygen (in blue) atoms in the region. The resulting composite highlights the bright swept-back ridges that outline pockets of cool interstellar dust and gas. Such embedded, dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within the obscuring cosmic dust.
[description text adapted from wikipedia and NASA APOD].
All sub exposures were acquired from my backyard on Sept, 24-27 2013.
- 17 x 30m Ha (5nm)
- 20 x 30m OIII (3nm)
- 26 x 30m SII (3nm)
Total exposure time: 31.5 hours
Equipment:
Main Camera: QSI 583 WSG
Guide Camera: SXV Lodestar (on OAG)
Mount: Astro-Physics Mach 1
Scope: Explore Scientific 102 f/7 (FL: 696mm)
Image Aquisition software MaximDL
Registed, Calibrated and Stacked in MaximDL
Post Processed with PixInsight 1.8 and Photoshop CS6
Astrometry annotations:
Center (RA, Dec):(323.892, 57.475)
Center (RA, hms):21h 35m 34.133s
Center (Dec, dms):+57° 28' 28.609"
Size:1.47 x 1.11 deg
Radius:0.923 deg
Pixel scale:1.6 arcsec/pixel
Up is -4.32 degrees E of N
![Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light years away. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.
[Description from wikipedia]
Ha: 20 x 30m (5nm)
OIII: 16 x 30m (3nm)
total exposure time: 18 hours.
Main Camera: QSI 583 WSG
Guide Camera: SXV Lodestar (on OAG)
Mount: Astro-Physics Mach 1
Scope: Celestron Edge HD 8" (FL: 2032mm)
Adaptive Optics Unit: SXV-AO-LF
Image Aquisition software MaximDL
Registed, Calibrated and Stacked in MaximDL
Post Processed with PixInsight 1.8 and Photoshop CS6](https://photos.smugmug.com/Astrophotography/Nebulae-in-Color-Narrowband/i-gkVXBvB/0/ac501638/S/NGC%206888%20HaOIII-S.jpg)
![[Description adapted from NASA APOD: the Crab is now known to be a supernova remnant, an expanding cloud of debris from the explosion of a massive star. The violent birth of the Crab was witnessed by astronomers in the year 1054. Roughly 10 light-years across today, the nebula is still expanding at a rate of over 1,000 kilometers per second]
This is a bicolor-rendition in the same style as NGC6888 (linked below in the comments).
I have mapped Ha to Red, OIII to blue and created a synthetic green channel mixing the two (15% OIII + 85% Ha).
Ha: 20 x 30m (5nm)
OIII: 20 x 30m (3nm)
total exposure time: 20 hours.
Main Camera: QSI 583 WSG
Guide Camera: SXV Lodestar (on OAG)
Mount: Astro-Physics Mach 1
Scope: Celestron Edge HD 8" (FL: 2032mm)
Adaptive Optics Unit: SXV-AO-LF
Image Aquisition software MaximDL
Registed, Calibrated and Stacked in MaximDL
Post Processed with PixInsight 1.8 and Photoshop CS6](https://photos.smugmug.com/Astrophotography/Nebulae-in-Color-Narrowband/i-4BrHh5h/0/e1c163fe/S/M1_RGB5-S.jpg)
![The Elephant's Trunk nebula is a concentration of interstellar gas and dust within the much larger ionized gas region IC 1396 located in the constellation Cepheus about 2,400 light years away from Earth.
This cosmic elephant's trunk is over 20 light-years long. The false-color view was recorded through narrow band filters that transmit the light from hydrogen (in green), sulfur (in red), and oxygen (in blue) atoms in the region. The resulting composite highlights the bright swept-back ridges that outline pockets of cool interstellar dust and gas. Such embedded, dark, tendril-shaped clouds contain the raw material for star formation and hide protostars within the obscuring cosmic dust.
[description text adapted from wikipedia and NASA APOD].
All sub exposures were acquired from my backyard on Sept, 24-27 2013.
- 17 x 30m Ha (5nm)
- 20 x 30m OIII (3nm)
- 26 x 30m SII (3nm)
Total exposure time: 31.5 hours
Equipment:
Main Camera: QSI 583 WSG
Guide Camera: SXV Lodestar (on OAG)
Mount: Astro-Physics Mach 1
Scope: Explore Scientific 102 f/7 (FL: 696mm)
Image Aquisition software MaximDL
Registed, Calibrated and Stacked in MaximDL
Post Processed with PixInsight 1.8 and Photoshop CS6
Astrometry annotations:
Center (RA, Dec):(323.892, 57.475)
Center (RA, hms):21h 35m 34.133s
Center (Dec, dms):+57° 28' 28.609"
Size:1.47 x 1.11 deg
Radius:0.923 deg
Pixel scale:1.6 arcsec/pixel
Up is -4.32 degrees E of N](https://photos.smugmug.com/Astrophotography/Nebulae-in-Color-Narrowband/i-WSvb44x/0/d55a30cd/S/IC1396%20-%20SHO-S.jpg)
![Perhaps an unconventional look for the bubble.
The reddish tones are due to the hydrogen, while the white/blue wispy stuff is sulphur.
NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star.
The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow
[description lifted from wikipedia.org]
Ha acquired on Oct 13 and 14, 2013 from my backyard
SII acquired on Oct 30 and 31.
Ha: 28 x 30m
SII : 28 x 30m
Total exposure time: 28 hours
Main Camera: QSI 583 WSG
Guide Camera: SXV Lodestar (on OAG)
Mount: Astro-Physics Mach 1
Scope: Celestron EdgeHD 8" (FL: 2032 mm)
SXV Adaptive Optics
Image Aquisition software MaximDL
Registed, Calibrated and Stacked in MaximDL
Post Processed with PixInsight 1.8 and Photoshop CS6](https://photos.smugmug.com/Astrophotography/Nebulae-in-Color-Narrowband/i-SQ58x2M/0/f9c97032/S/NGC%207635%20bubble%20nebula%20HaSII-S.jpg)
![A closeup of the "bubble nebula" (NGC 7635) in narrowband reveals a few cool features, one of which is a milky "plume" especially prominent in the SII channel.
I have since replaced my duotone version of the bubble (linked here: www.flickr.com/photos/dmal/10637590174/) to better show the plume inside the bubble
NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot, 8.7 magnitude young central star.
The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow
[description lifted from wikipedia.org]
Ha acquired on Oct 13 and 14, 2013 from my backyard
SII acquired on Oct 30 and 31.
OIII acquired in the first week of November 2013.
Ha: 28 x 30m
SII : 28 x 30m
OIII: 30 x 30m
Total exposure time: 43 hours
Main Camera: QSI 583 WSG
Guide Camera: SXV Lodestar (on OAG)
Mount: Astro-Physics Mach 1
Scope: Celestron EdgeHD 8" (FL: 2032 mm)
SXV Adaptive Optics
Image Aquisition software MaximDL
Registed, Calibrated and Stacked in MaximDL
Post Processed with PixInsight 1.8 and Photoshop CS6](https://photos.smugmug.com/Astrophotography/Nebulae-in-Color-Narrowband/i-DxRHG6P/0/08926b57/S/NGC%207635%20bubble%20nebula%20closeup%20SHO-S.jpg)
