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Contains:  NGC 1491
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NGC 1491 in Perseus H_HS_O_OH, 





    
        

            Pat Rodgers
NGC 1491 in Perseus H_HS_O_OH

NGC 1491 in Perseus H_HS_O_OH

Technical card

Resolution: 965x710

Dates:Dec. 27, 2017Oct. 22, 2018Oct. 27, 2018Oct. 28, 2018

Frames:
Baader Ha 1.25" 7nm: 35x120" -15C bin 1x1
Baader Ha 1.25" 7nm: 40x600" -15C bin 1x1
Baader OIII 1.25" 8.5nm: 15x600" -15C bin 1x1
Baader S2 1.25" 8nm: 16x600" -15C bin 1x1

Integration: 13.0 hours

Darks: ~29

Flats: ~31

Bias: ~149

Avg. Moon age: 14.37 days

Avg. Moon phase: 82.73%

Bortle Dark-Sky Scale: 6.00

Temperature: 5.57

Astrometry.net job: 2367065

RA center: 60.904 degrees

DEC center: 51.334 degrees

Pixel scale: 1.328 arcsec/pixel

Orientation: 127.711 degrees

Field radius: 0.221 degrees

Locations: Un-stable Observatory, back garden., Huddersfield, West Yorkshire, United Kingdom

Data source: Backyard

Description

NGC 1491( Sh2-206) lies very close to Sh2_205 if you have a good fov these two objects in Perseus make for a good image. The Ha and SII are blended into the red channel (50/50), green is 100% OIII and the blue is a blend of OIII and Ha (85/15) a method from J P Metsavainio. The OIII and SII are still noisy but I'll gather more subs for thesefilters as the moon allows, as it is this is now eight hours worth over a few different nights. Perseus rises high enough for me after midnight atm.

Rev A: The 4 hours Ha with a STF applied. This is used as the Luminance for the coloured image.

I had taken 4 hours of Ha back in Dec 2017 on this and 70 minutes OIII and SII. It was at a different rotation to the recent data. I've integrated both sets now. It results in a heavy crop of the area surrounding Mt Everest ( looks like the mountain poking above the clouds to me.) I only used 2 hours of the Ha though mist or Ice had effected some of the subs.

Comments

Author

Pat_Rodgers
Pat Rodgers
License: None (All rights reserved)
1682
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Revisions

  • NGC 1491 in Perseus H_HS_O_OH, 





    
        

            Pat Rodgers
    Original
  • NGC 1491 in Perseus H_HS_O_OH, 





    
        

            Pat Rodgers
    B
  • NGC 1491 in Perseus H_HS_O_OH, 





    
        

            Pat Rodgers
    C
  • Final
    NGC 1491 in Perseus H_HS_O_OH, 





    
        

            Pat Rodgers
    D
  • NGC 1491 in Perseus H_HS_O_OH, 





    
        

            Pat Rodgers
    E

B

The H HS_O_OH eight hours wip.

C

A blend of B and a SHO combination.

D

The heavily cropped 2017/18 data. I re-registered the subs to this orientation as the bright core looks like Everest poking through the clouds to my eye. The Ha stack was de-convoluted and added as a Luminance, so a H-HS HO O

E

Just showing how much the two rotation needed to be cropped out.

Sky plot

Sky plot

Histogram

NGC 1491 in Perseus H_HS_O_OH, 





    
        

            Pat Rodgers

In these public groups

UK Astro-Imaging
Fast Newtonians