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Rosette Nebula - Bicolor | by Alejandro Pertuz
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Rosette Nebula - Bicolor

The Rosette Nebula is a large region of ionized hydrogen located in the constellation of Monoceros, close to Orion. It lies at approximately 5000 light years from Earth and has 130 light years in diameter. The cluster in the centre is responsible of sculpting the nebula, can you spot those structures that resemble animals? I can see an elephant, a donkey and a cheetah.


This picture is a bicolor composition using H-Alpha and Oxygen-III filters. I assigned Ha to red, OIII to blue and a mixture of both channels to a synthetic green.


Exposure time:

Ha - 19x300s

OIII - 24x300s



ASI183MM Pro

TS80 Triplet Apo at 380mm of focal lenght

Baader OIII and Ha filters

NEQ6 Pro II modified mount

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Uploaded on January 26, 2019