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Saturday, February 26, 2011

LDN1622, "Boogie Man Nebula", finalized

LDN 1622, a dark nebula in Orion
Ra 05h 55m 11s Dec +02° 00′ 00"

Note. Part of the "Parnad's Loop" visible at background of  LDN 1622.
Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.

At the same night, February 25 ,I shot rest of the lights for Sh2-216 at previous post, I was able to finalize O-III and S-II channels for LDN 1622. 
Since this object stays low at here 65N, there is way too little data for a great image. I leave this as it is due the weather. While shooting data, the transparency was bad and that ate out signal very badly. Due that, no HST-palette version this time.

LDN 1622, "Boogie Man Nebula", in Orion is a silhouette of dark nebula at lower half of the image. At background, there is part of the "Parnad's Loop", a large cloud of hydrogen surrounding the nebula complex at Belt and Sword of Orion. LDN 1622 is much closer, than a more famous Orion nebulae, about 500 light years.
This target is very difficult to shoot, since it doesn't rise high, up here 65N. Maximum elevation is only about 27 degrees, at the end of the imaging session, the elevation is only 14 degrees above horizon. I actually had to stop imaging for a while, to avoid a chimney at top of the opposite building. Transparency was poor at the time the data was collected.

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack. 
Levels, curves and color combine in PS CS3.

Tokina AT-X 300mm f2.8 @ f2.8
Platform and guiding, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guider, Lodestar
Image Scale, 3,79 arc seconds/pixel

Baader H-alpha 7nm 12x1200s, binned 1x1
Baader O-III 8,5nm 6x600s, binned 2x2
Baader S-II 8nm 5x600s, binned 2x2

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