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Contains:  NGC 7023
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Iris and the Ghost (NGC 7023 to vdB 141 area), 





    
        

            snakagawa
Iris and the Ghost (NGC 7023 to vdB 141 area)

Iris and the Ghost (NGC 7023 to vdB 141 area)

Technical card

Resolution: 1920x1160

Astrometry.net job: 698753

RA center: 317.585 degrees

DEC center: 68.090 degrees

Pixel scale: 5.542 arcsec/pixel

Orientation: 4.100 degrees

Field radius: 1.727 degrees

Description

This is my last image from C8 Fastar+Hyperstar combination, before the corrector plate got smashed during day-time collimation.... (sad)

C8 Faster (black)+ Hyperstar 3; SXVR-M25C at -15 deg C
An aperture mask was used to improve FWHM (F/2.1 increasing to F/2.66 [F/3 effective])
10min x 29
2min x 15

Slightly cropped near the bottom and the left for collimation errors.

A Hyperstar used with a large CCD chip (such as in M25c) results in strong light fall off which is difficult to correct with flats. The aperture mask improved this, making about 2/3 of the center field (linear) more or less flat. However, the fall off near the edge was still quite severe, the intensity dropping to ~50% of the field center. The original flats were adjusted slightly on ImagesPlus to reducer errors.

Comments

Author

snakagawa
snakagawa
License: None (All rights reserved)
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Iris and the Ghost (NGC 7023 to vdB 141 area), 





    
        

            snakagawa