Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  57 Cyg  ·  60 Cyg  ·  62 Cyg  ·  62 ksi Cyg  ·  B352  ·  B353  ·  B355  ·  B358  ·  NGC 6989  ·  NGC 6996  ·  NGC 6997  ·  NGC 7000  ·  North America Nebula  ·  The star 57 Cyg  ·  The star 60 Cyg  ·  The star ξ Cyg
Getting plate-solving status, please wait...
North America Nebula SII, Ha, OIII, JDAstroPhoto
Powered byPixInsight

North America Nebula SII, Ha, OIII

Getting plate-solving status, please wait...
North America Nebula SII, Ha, OIII, JDAstroPhoto
Powered byPixInsight

North America Nebula SII, Ha, OIII

Equipment

Loading...

Acquisition details

Loading...

Description

Episode 1 and 2:
In episode 1 we explored our first star birthing area, the Pelican Nebula.  We were awe struck by the weird dog face peering over the Pelican’s beak.  In episode 2 we ventured beyond our galaxy into intergalactic space 23 million light years away, and 23 million light years in the past.  We were struck by the nothingness of intergalactic space, until we came upon the Whirlpool galaxy interacting with a neighboring galaxy NGC 5195.
The North America Nebula, Episode 3:
I invite you to join me back to the familiarity of our own galaxy, the Milky Way galaxy.  As we move away from the Pelican Nebula, we encounter the North America Nebula which is 3,000 light years from earth.  Once again, we are viewing light that originated 3,000 years ago, so we are viewing into the past. The North America Nebula is a large emission nebula over 100 by 120 arcminutes in size.  To give you a comparison, it spans the equivalent of 10 full moons in the sky.  The Nebula size extends 90 light years to 140 light years.  Just like the Pelican Nebula you can see Herbig-Haro objects, i.e. tunnels of gas in the image emitted by young stars birthed in the Nebula.  These tunnels of gas are moving at hundreds of kilometers per second and the collisions of matter glow as a result.  Because of the enormous scale of the nebula gas, we do not notice any changes in the gasses from earth, even though they are moving hundreds of kilometers per second. The North America Nebula contains all three Nebula emissions, SII, Ha and OIII.  One of the main stars that ionizes the Nebula’s gasses and causes the Nebula’s glow, is a massive binary star HD199579 (Miro’s Diamond).  Can you find HD199579 (Miro’s Diamond)? Hints: Look for a large star within the Oxygen III region (Blue) region in the Nebula towards the right side.  It is binary star, with a very large star and a very small star on its left side, very close, almost touching.  Make sure you are looking at the image in full resolution.  Binary stars are in orbit around each other.
Acquisition:
7/26/2022, 7/28/2022, 7/29/2022, 8/01/2022, 8/02/2022, 8/05/2022, 8/06/2022
All subs (lights) were 15 minute acquisitions.  
ChromaSII, Ionized Sulfur, i.e. Sulfur atom that has lost 1 electron, 672.4nm bandpass 3nm width - 27 Frames, 15 minutes each, 6 hours 45 minutes = RED
Chroma Ha, Hydrogen Alpha, Occurs when a hydrogen electron falls from its third to second lowest energy level, 656.3nm bandpass 3nm width - 23 Frames, 15 minutes each, 5 hours 45 minutes = GREEN
Chroma OIII, Doubly ionized oxygen, i.e. Oxygen atom that has lost 2 electrons, 500.7nm bandpass 3nm width - 22 Frames, 15 minutes each, 5 hours 30 minutes = BLUE
Total Imaging Time = 18 hours
No guiding, Polar aligned with  a 60 point sky model.

Calibration:
20 – 15 minute Darks, SII, Ha, OIII
150 Flats  SII, Ha, OIII
125 Dark Flats  SII, Ha, OIII
Image Rendering:
Hubble Pallet:
Red - SII
Green - Ha
Blue - OIII
I used 2 parallel paths to render this image, ensuring the stars are portrayed with an accurate color rendition.  I used PixInsight Photogrammetric Color Calibration for narrow band filtering to keep the star colors accurate and isolated and isolated the stars using StarNet2, ensuring accurate star color rendering.These images were combined over 7 nights.  Each image was a 15 minute exposure with either a SII, Ha or OIII filter.  The process involves calibrating, registering, star aligning and stacking these images, until you have 3 master images.  One for each filter.  The signal for the images increases by the square root of the number of images.  For example, if you stack 9 images, you increased the Signal (as compared to one image) by 3 times. The measured signal for the final 3 images, SII, Ha and OIII was 40 decibels (db) each.

Comments

Sky plot

Sky plot

Histogram

North America Nebula SII, Ha, OIII, JDAstroPhoto

In these public groups

SDAA AISIG Group