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Contains:  27 gam Cas, IC 59, IC 63, IC59, IC63, Sh2-185, The star Navi (γCas), gamma Cas nebula
The Ghost haunting Gamma Cassiopeia, 



    
        

            Kharan
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The Ghost haunting Gamma Cassiopeia

Technical card


Dates:Sept. 13, 2020Sept. 14, 2020

Frames:
Baader Blue 2": 19x300" -30C bin 1x1
Baader Green 2": 20x300" -30C bin 1x1
ZWO Ha 7nm: 20x300" -30C bin 1x1
Baader L 2'': 21x300" -30C bin 1x1
Baader Red 2": 20x300" -30C bin 1x1

Integration: 8.3 hours

Flats: ~20

Bias: ~100

Avg. Moon age: 25.70 days

Avg. Moon phase: 15.92%


Astrometry.net job: 3850128

RA center: 0h 57' 50"

DEC center: +60° 56' 25"

Pixel scale: 1.105 arcsec/pixel

Orientation: -56.137 degrees

Field radius: 0.622 degrees


Resolution: 3226x2456

Locations: Puolivälinkangas - Oulu, Oulu, Finland

Data source: Backyard

Description

IC 59 and IC 63 (the ghost) are a combination of faint, arc-shaped emission and reflection nebulae, located about 600 light-years away in the constellation Cassiopeia. Together they are approximately 10 light-years across.

The bluish glow shinning down from the top comes from the intense radiation of the bright, hot star Gamma Cassiopeia that is located only 3 to 4 light-years from the nebulae, and which may also have shed this nebulous material into the space around it. The edges of the nebulae glow brightly from this intense radiation that is slowly evaporating and lighting up these flowing shapes of gas and dust.

Gamma Cassiopeia is with a radius of 14 times our Sun, 55,000 times more luminous, 19 times more massive, and rotates at about 300 kilometers per hour, or 150 times more rapidly than the Sun. It is known as an eruptive blue-white subgiant variable star. (Eruptive variable stars vary in brightness because of violent processes and flares in their coronae and chromospheres.)

This star is an erratic variable that reached a maximum brightness in 1937, but then unexpectedly dropped in surface temperature from 12,000°K to 8500°K. It is encircled by a surrounding gaseous disk of material thrown off by its rapid rotation, that radiates the emissions. Mass loss is apparently related to the brightness variations.

IC 63 — the brighter of the two and slightly closer to Gamma Cassiopeia than IC 59 — is a combination of an emission and reflection nebula. Unlike a reflection nebula which appears blue, the glowing hydrogen gas appears red. IC 59 is primary a refection nebula, showing much less red hydrogen, and is appearing blue of dust reflected starlight that is passing through it.

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Kharan
Kharan
License: None (All rights reserved)
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The Ghost haunting Gamma Cassiopeia, 



    
        

            Kharan