IC 410 - Tadpole Nebula (Walter Koprolin)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: IC 410 · NGC 1893 · The star 16Aur · The star 19Aur

IC 410 - Tadpole Nebula, Walter Koprolin

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IC 410 - Tadpole Nebula

Link: https://nightsky.at/Photo/Neb/IC410_WN.php

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IC 410 - Tadpole Nebula

Link: https://nightsky.at/Photo/Neb/IC410_WN.php

Around New Year's Eve 2019/20 I used five clear nights for taking Hα and [OIII]-filtered exposures of IC 410, the Tadpole Nebula, with my 4.9" Wright-Newtonian telescope in my backyard in Vienna, Austria. Conditions varied from windy to calm and humid, with air temperatures between -3 and +3 degrees Celsius. Transparency was not always good, I had to discard many sub-optimal exposures when either thin clouds passed through or the object was too low in the light-polluted sky or guiding errors resulted in trailed stars. Nonetheless, I acquired 10 hours of usable Hα exposures and 5 hours of [OIII], enough for a decent image. I did not attempt [SII] exposures.

Processing steps: File selection and bias/dark/flat calibration, star alignment and image integration, noise reduction, deconvolution, non-linearization, star-background separation, local contrast enhancement, color synthesis using tone mapping, color correction, star size reduction, re-adding of the stars

Tonemap composition:

Red = Hα

Green = [OIII]

Blue = [OIII] + 15% Hα to compensate for missing Hβ

Master Luminance composition:

L = Hα + 30% [OIII]

Some color-tweaking was required after tone mapping because the result was too greenish. The nebula's center glows bright in [OIII] light, colored blue, while the Tadpoles, which protrude into the center from the upper left, and all of the nebula's outskirts are dominated by red-colored Hα emission. Red structures in the upper right corner belong to the neighboring Flaming Star Nebula IC 405.

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Status	Basic success
Started	...
Astrometry.net job	3197027
PixInsight job	n/a
PixInsight queue size	n/a
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IC 410 - Tadpole Nebula

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