Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 281
Getting plate-solving status, please wait...
NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís
NGC281 (The Pac-man Nebula)

NGC281 (The Pac-man Nebula)

Technical card

Resolution: 2957x2777

Dates:Nov. 29, 2017

Frames:
ZWO Ha 36mm: 10x300" (gain: 139.00) -20C bin 1x1
ZWO OIII 36mm: 9x300" (gain: 139.00) -20C bin 1x1
ZWO SII 36mm: 9x300" (gain: 139.00) -20C bin 1x1

Integration: 2.3 hours

Darks: ~16

Flats: ~25

Bias: ~110

Avg. Moon age: 10.14 days

Avg. Moon phase: 77.69%

Bortle Dark-Sky Scale: 5.00

Temperature: 32.00

Astrometry.net job: 1862365

RA center: 0h 53' 9"

DEC center: +56° 38' 16"

Pixel scale: 1.039 arcsec/pixel

Orientation: 297.390 degrees

Field radius: 0.585

Locations: Backyard, Milford, MA, United States

Description

My first attempt at The Pac-man Nebula in Hubble palette. Definitely needs more time, will probably gather more data this week, but I like to see what I can get out of the subs I have.

I also would like to capture just the stars in RGB, because I really don't like the unnatural star color I get with narrowband. I'm sure there is a way to do it in PixInsight, the only question is how many days will it take to figure it out :)

Comments

Author

Ejsboston
Eric Solís
License: None (All rights reserved)
931
Like

Revisions

  • NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís
    Original
  • NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís
    B
  • NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís
    C
  • NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís
    D
  • NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís
    E
  • Final
    NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís
    F

B

I changed the color combination to: R = 0.5 x SII + 0.5 x Ha G = 0.9 x Ha + 0.1 x OIII B = 1.0 x OIII I like the hue and internal contrast of the result. Also, I saturated the colors less this time to make the result less iridescent.

C

Slight curves adjustment

D

A very nice new color combination that was graciously suggested by the awesome and very helpful Ruben Barbosa! R: 75% SII + 25%Ha G: 33% SII + 33% Ha + 33%OII B: 100% OIII I used Ha alone as a pseudo-luminance because the data quality for the other filters was much lower and introduced too much noise when mixed with Ha for pseudo-luminance. Thanks again to Ruben for the tips! Input like this is what makes AstroBin such a fantastic community, especially for someone like me who is still daunted by the complexities of the image processing! And doubly for those of us moving to narrow band from a DSLR!

E

Similar to D, except with more noise reduction and increased contrast between nebula and background. Again, many thanks to Ruben for his suggestions with the processing of this image!

F

Slight background reduction from E.

Sky plot

Sky plot

Histogram

NGC281 (The Pac-man Nebula), 





    
        

            Eric Solís