Heart and Soul in Cassiopeia

This time I used two old data sets of IC 1805 and IC 1848, one from when the camera has not been modified yet and one from last summer, both under fair skies.

(1) 41×2 min, ISO 1600, Canon EF 200mm f2.8L II USM at F/3.5, Canon 1100D unmod, EQ3 (see article)
(2) 8×3 min, ISO 1600, Canon EF 200mm f2.8L II USM at F/4, Canon 1100D mod, HEQ5 (see article)

I reduced the stars with my own program.

Galaxies Maffei 1 and Maffei 2 are also in the frame, the yellow patches on the bottom. Both galaxies are in the zone of avoidance, ie in the plane of the Milky Way where the dust adds up to be almost opaque. Wiki says 99.5% of the light of Maffei 2 is obscured. In a crop below I emphasize these objects with infrared data from WISE. The dust is mostly transparent at infrared wavelengths.

raw sample, Canon 1100D pre mod, November 2015

raw sample, Canon 1100D pre mod, November 2015

stack of the two data sets

stack of the two data sets

Curves, colors

Curves, colors

The healing mask produced by my program

The healing mask produced by my program

 
(1): No star reduction
(2): Full star reduction
 
 
(1): No star reduction
(2): Full star reduction
 
 
Top (displayed with ... opacity, slide to change): Full star reduction
Bottom: No star reduction
 
Maffei 2 and Maffei 1

Maffei 2 and Maffei 1

The marked region cropped. Maffei 2 is the deep yellow/orange patch on the left, Maffei 1 is the yellow is on the right

The marked region cropped. Maffei 2 is the deep yellow/orange patch on the left, Maffei 1 is the yellow is on the right

Infrared data from WISE. Maffei 2 is the spiral galaxy, Maffei 1 is the elliptical one

Infrared data from WISE. Maffei 2 is the spiral galaxy, Maffei 1 is the elliptical one

My data combined with the WISE infrared data of the galaxies Maffei 2 and Maffei 1 – I kept only the galaxies, removed the star field

My data combined with the WISE infrared data of the galaxies Maffei 2 and Maffei 1 – I kept only the galaxies, removed the star field

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