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Contains:  IC 1795, IC 1805, NGC 1027, NGC 896
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IC 1805 - The Heart Nebula in HaRGB, 


            Christophe Perroud
IC 1805 - The Heart Nebula in HaRGB
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IC 1805 - The Heart Nebula in HaRGB

Technical card

Dates:Aug. 25, 2019Sept. 3, 2019

140x90" ISO800
Astronomik 12nm Ha Clip Filter: 40x90" ISO1600

Integration: 4.5 hours

Darks: ~30

Flats: ~40

Bias: ~50

Avg. Moon age: 14.33 days

Avg. Moon phase: 26.61%

Bortle Dark-Sky Scale: 3.00

Temperature: 15.00

Basic astrometry details job: 2907850

RA center: 2h 33' 43"

DEC center: +61° 30' 57"

Pixel scale: 2.613 arcsec/pixel

Orientation: 56.260 degrees

Field radius: 2.342 degrees

Resolution: 5315x3661

Locations: Pied du Jura, Champagne, VD, Switzerland

Data source: Backyard


Very good weather and sky condition last two weeks, so I was able to shot a new target I wanted to catch since long time ago : IC 1805, the Heart Nebula in constellation Cassiopeia. This beautiful double-ionized gas region holds several nice features such as the Fish Head Nebula (NGC896) and Melotte 15, a open cluster located in the brightest central part of the nebula, home of O-type supergiant stars about 50 to 100 times the Sun’s mass.
On the right border of the heart-shaped nebula is also Mk 6, Markarian 6, a nice open cluster with less than ten bright stars. IC1805 lies some 7’500 l.y. away and spans 200 l.y.

I did 60min Ha and 210 min RGB integration (means without filter) over two nights on not-so-bad conditions : no wind, no high clouds, no dew at all. Temperature around 15°C.

This is the 2nd time I combine Ha and RGB datas to create a single image using NBRGBCombination script. I processed each image individually before combine them together and processed some small touch-up as usual. Still a lot to learn under PI but it makes so much fun ;-) I hope you will enjoy this image and do not hesitate to post any comment and suggestion ;-)



Christophe Perroud
License: None (All rights reserved)

Sky plot

Sky plot


IC 1805 - The Heart Nebula in HaRGB, 


            Christophe Perroud