NGC 6992 - Eastern Veil Nebula (HOO)

Located 1470 LY from us in the constellation Cygnus the Veil Nebula is a cloud of heated and ionized gas and dust.  NGC 6992 or the Eastern Veil Nebula forms a portion of the Cygnus Loop, a supernova remnant. A star 20 times more massive than the Sun exploded around 8,000 years ago to form this complex (source: Wikipedia). This is another favorite image during the summer months for astrophotographers. 

I very happy with how this image turned out as it blows my previous image captured two years ago out of the water.  The framing could have been a bit better but everything else went smoothly.  I captured 1.5 hrs of Ha on 9/16 and 1.5 hrs of OIII on 6/18 while the moon was out. My only regret was I did not get any RGB data for the star field, however, HOO star field came out better than I anticipated.  

This image was fun to process as everything I did in PI looked OK when I tried it.  In contrast, I had to do heavy processing on my image from a couple years ago and nothing seemed to look good.  I ended up combining it with the simple RGB Combination, however, I did experiment with using PixelMath and doing Ha and OIII combinations in the green and blue channels.    I did an Automatic Background Extraction, noise reduction - SNCR, Histogram Transformation, Curves and then switched to Photoshop for a couple of things and that was it.

NGC 9662 - Eastern Veil Nebula - HaOO
Location: Home Monroe, CT
Date: 9-16-18, 9-18-18
Camera: ZWO ASI1600MM-Pro
Telescope: Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Barlow: None
Focal Length: 600mm
f/7.5
Focal Reducer: Orion 0.8x Focal Reducer for Refractor Telescopes
Mount: Orion Sirius EQ
Filter Wheel: ZWO EFW 8x 1.25"
Filter: ZWO Ha, OIII
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: Ha 30 x 180s, OIII 30 x 180s
Gain: 139
Offset 21
Temp: -10 C
Post Processing: PixInsight and Photoshop
https://kurtzeppetello.smugmug.com/

IC 1396 - Elephant's Trunk Nebula

The Elephant's Trunk Nebula (IC 1396) is located in the constellation Cepheus about 2,400 light years away from Earth.  The gas and dust in and around the Elephant's Trunk are being illuminated and ionized by a very bright, massive star (HD 206267). The Elephant's Trunk appears on the right side of the wide field image and is light up on the sides. 

Although it took a while to process, I did not really have to do much in PI or PS.  I am growing very fond of this new monochrome cooled camera as images appear virtually noise free compared to what I used to capture.  I especially like how the Elephant's Trunk resembles a canyon upon close examination.  The trunk itself is a dark elongated area composed of gas and dust with many young proto-stars not visible with optical telescopes.  It is revealed by the Spitzer Telescope's infra red detectors (http://coolcosmos.ipac.caltech.edu).  The wide field image shows much of the nebulosity of the whole region as well as the colorful star field.

I believe the camera has taken my telescope to its limit, meaning I need a new telescope.  The F7.5 ED80 has been a proven workhorse and all my telescope deep sky images on Astrobin have been taken with it.  It is a very sturdy, inexpensive telescope at less than $500.  Although it is listed as an apochromatic, it is a doublet with extra-low dispersion glass on one of the lenses, still OK, just not a triplet.  I do recommend it for anyone who wants to get started in AP but you might get a better deal if you just start of with a slightly more expensive triplet if the accessories are included. 

For example, the Orion currently lists the ED80 at $479 for the optical tube only and single speed focuser.  Add in the rings, dual speed focuser, and diagonal standard on most entry level 80mm triplets and you are up to $800 or more.  The Astro-Tech AT80 currently lists at $749.  You may be able to this scope cheaper on Ebay or you get it as a package deal with the Sirius mount which includes all the extras.  Of course I did neither and opted for the more expensive way.  I suppose this little review would be better served on a buyers guide or something since most Astrobin users are far beyond the ED80.

Wide Field HaRGB

Wide Field Ha

Crop HaRGB

IC 1396 - Elephant's Trunk Nebula - HaRGB Processing in PixInsight
Location: Home Monroe, CT
Date: 9-4-18 (Ha), 9-5-18 (RGB)
Camera: ZWO ASI1600MM-Pro
Telescope: Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Barlow: None
Focal Length: 600mm
f/7.5
Focal Reducer: Orion 0.8x Focal Reducer for Refractor Telescopes
Mount: Orion Sirius EQ
Filter Wheel: ZWO EFW 8x 1.25"
Filter: ZWO Ha, R, G, B
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: 9/4-(Ha) 34 x 300s, 9/5-(R) 30 x 60, (G) 19 x 60, (B) 20 x 60
Gain: 139
Offset 21
Temp: -10 C
Processing: APT, PixInsight and Photoshop
https://kurtzeppetello.smugmug.com/

NGC 6823 (and SH2-86) - HaRGB Processing in PixInsight

NGC 6823 is an open cluster surrounded by a nebula complex Sh2-86 in the constellation of Vulpecula.  The open star cluster is about 50 light years across and lies about 6000 light years away. The center of the cluster formed about two million years ago and is dominated by bright young blue stars (source: wikipedia and Astronomy).

I captured this object last year (image) using a UHC filter (29x180s) and Canon T3i and processed it using my former method.  This new image HaRGB was captured using the ZWO ASI1600MM-Pro and processed primarily using PixInsight. 

I wrote up a comparison between two methods for producing HaRGB images below.  The two methods are as follows: method 1 - using the LRGB combination and method 2 - using PixelMath.  If you are not familiar with PixelMath I recommend watching the Harry's Astro Shed video Adding Ha to RGB which is the procedure I followed.

Creating the HaRGB Image

1) Registering, aligning, and stacking was done in PixInsight using the Batch Preprocessing function.  I followed Chuck's Astrophotography (Stack and Combine Filters in PixInsight) method to do this.

2) Automatic Background Extraction was run on the Ha channel to make the Ha image.

Ha

Method 1 - Using LRGB Function to create the HaRGB image 

For this method I did not use anyone's specific directions, it was described on numerous websites and forums.

3) An RGB Image was created using the RGB combination function.  Processing included: ABE, Color Calibration, SNCR noise reduction, HistogramTransformation,  Extract CIE Component, Reduce star size - Star Mask - Morphological Transformation, Sharpness and Saturation - Mask - Convolution.  This was only for show as the image was not used for anything.

RGB

4) The simplest HaRGB Image was created by combining the separate channel using the LRGB process and the Ha was put into the Luminosity channel at 0.5 strength.  Further processing included: ABE, Color Calibration, HistogramTransformation,  Extract CIE Component, Reduce star size - Star Mask - Morphological Transformation, Sharpness and Saturation - Mask - Convolution.

HaRGB - Simple

In my opinion this image was better than my image from last year and the star colors came out very well.  However I was not satisfied with the detail or the look so I did some more research on combining HaRGB.  Most experienced PI users do not use the LRGB process to combine Narrowband data but rather a process using the PixelMath function.  

Method 2 - Using PixelMath to create the HaRGB image 

For this method I chose Harry's Astro Shed video Adding Ha to RGB to complete the combination (http://harrysastroshed.com/pixinsight/pixinsight%20video%20html/pixinsighthomeinter.html).

3)  The original was Ha image which ABE was already run was further enhanced using the using the following script: ((Ha*100)-(R*7)/(100-7) added to RGB/K channel.  That is the Ha image (Ha) and the Red Channel (R) are merged and the unwanted Ha is subtracted out of the image.  The '7' is the filter size and the '100' is I believe the intensity which can be adjusted. I ended up using 140 for my image.

Enhanced Ha

4)  Next up was adding the Enhanced Ha image to the Red channel again using PixelMath.  I used the following script for this:  $T+(Enhanced Ha-Med(Enhanced Ha))*4 and then applying this to the Red Channel.  What you get is an Enhanced Red Channel image.  The number '4' is the scale and can be adjusted to give the optimal look.

Red Channel

Enhanced Red Channel

5)  Finally you can combine your RGB channels using the Enhanced Red Channel to make the HaRGB image.  Further processing included: HistogramTransformation,  Extract CIE Component, Reduce star size - Star Mask - Morphological Transformation, Sharpness and Saturation - Mask - Convolution.

HaRGB-v1

Finally

In my opinion this method produced a far superior image than the simple LRGB method (method 1).  The detail and sharpness are greatly enhanced using the PixelMath process (method 2).  However, I do like the star colors of the LRGB method and will attempt to add them to the image using a star mask. I did no processing in Photoshop except for file saving as I wanted  to show a comparison between HaRGB images using the LRGB method and the PixelMath method.  I will add updated versions of the final image when they become available.

Version2
For this next addition I added the Enhanced Ha the LRGB function.  Enhanced Ha was added to the luminosity channel at 0.65 intensity.

HaRGB-v2

Version 3

Toned down the red channel, minor sharpening and noise reduction in Photoshop

HaRGB-v3

Version 4
Toned down the red channel, minor sharpening and noise reduction in Photoshop

HaRGB-v4

Version 5
Added the RGB star colors using photoshop and then back to PI - PixelMath, StarMask, and Morphological Transformation.

HaRGB-v5

Comparison

NGC 6823 (and SH2-86) - HaRGB Processing in PixInsight

Location: Home Monroe, CT
Date: 8-28-18 (Ha), 8-29-18 (RGB), 8-30-18 (RGB), 9-2-18 (RGB), 9-3-18 (Ha) 

Camera: ZWO ASI1600MM-Pro
Telescope: Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Barlow: None
Focal Length: 600mm
f/7.5
Focal Reducer: Orion 0.8x Focal Reducer for Refractor Telescopes
Mount: Orion Sirius EQ
Filter Wheel: ZWO EFW 8x 1.25"
Filter: ZWO Ha, OIII, SII
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: (Ha 8/28) 44 x 180s, (Ha 9/3) 29 x 180, (R) 63 x 60, (G) 52 x 60, (B) 47 x 60

Gain: 139
Offset 21
Temp: -10 C
Processing: APT, PixInsight and Photoshop
https://kurtzeppetello.smugmug.com/