Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  NGC 7822  ·  Sh2-171
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LBN 581 (HSO), Linda
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Getting plate-solving status, please wait...
LBN 581 (HSO), Linda
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Equipment

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Acquisition details

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Description

LBN 581, also known as NGC 7822 and Cederblad 214, is an emission nebula in Cepheus. It's not one of the most popular targets but it is large, and especially in hydrogen alpha, very interesting.

The OIII and SII are very faint compared to the hydrogen alpha but still present.

Processing was straightforward:

On the h-a, oIII and sII masters:

dynamic crop

DBE

MLT (noise reduction)

Linear fit to h-a

combined:

channel combination (HSO)

histogram transformation

local histogram equalization (2 scales)

curves (contrast & color)

adv sharpening script

The biggest challenge was DBE since the field is full of nebulosity. I used only about 6 points and scrutinized the background model to make sure it looked like gradient. Actually the only significant gradient was in SII where about half the subs were captured during fairly bright moonlight.

Overall, this was a fun project and I enjoyed getting to know one off the lesser known jewels of the night sky!

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