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Helix nebula Bi Colour
The Helix nebula (NGC 7293), is a large planetary nebula located in the constellation Aquarius. The estimated distance is about 700 light-years.
2 versions
HOO is just a bi colour narrow band composition where HA is red and OIII is green and blue.
The other image is a composition of HA and OIII to make a green channel.
Skywatcher 72ED
HEQ5 Pro Beltmod
ZWO1600mm with filters
HA 22 x 15min 330
OIII 24 x 15min 360
Total 11.5hr
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