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Contains:  NGC 1491
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NGC1491, 





    
        

            dheilman
NGC1491

NGC1491

Technical card

Resolution: 5587x4470

Dates:Jan. 1, 2019Jan. 11, 2019Jan. 15, 2019Jan. 17, 2019Jan. 25, 2019

Frames:
Astrodon HA - 3nm: 56x300" bin 1x1
Astrodon OIII 3 nm: 57x300" bin 1x1
Astrodon SII 5nm: 67x300" bin 1x1

Integration: 15.0 hours

Darks: ~50

Flats: ~50

Bias: ~100

Avg. Moon age: 13.78 days

Avg. Moon phase: 52.61%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2596459

RA center: 60.995 degrees

DEC center: 51.238 degrees

Pixel scale: 0.560 arcsec/pixel

Orientation: 171.276 degrees

Field radius: 0.557 degrees

Data source: Backyard

Description

NGC1491 is an emission nebula in Perseus, also designated SH2-206 and LBN 704. This nebula has a very low surface brightness but an extremely bright core resulting in a very broad dynamic range - and a tough one to process. A young, blue O4 star (BD +50 ° 886) is illuminating the nebula, although intervening gas and dust give the star a reddish appearance when photographed or viewed visually (Coe, SR 2007).

I wanted to push this to get as much of the nebula structure as possible but given the low signal strength of the HII regions, especially in the periphery of the target, I had to tolerate some serious noise. In the end, I chose to leave the noise in favor of brighter outer regions.

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dheilman
dheilman
License: None (All rights reserved)
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NGC1491, 





    
        

            dheilman