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Hemisphere:  Northern
Getting plate-solving status, please wait...
The E-Nebula, 


            Kurt Zeppetello
The E-Nebula
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Imaging telescopes or lenses: Astro-Tech AT115EDT f/7

Imaging cameras: ZWO ASI 1600MM-Cool

Mounts: Orion Sirius EQ-G (HEQ5)

Guiding telescopes or lenses: Agena 50mm Guide Scope with Helical Focuser

Guiding cameras: QHY-5-L-II-M Planatary & Autoguider

Focal reducers: Astro-Tech 0.8x reducer/field flattener

Software: Adobe photoshop  ·  Pleiades Astrophoto PixInsight  ·  AstroPhotography Tools APT capture software  ·  Astronomy Tools - PS  ·  PHD Guiding

Filters: ZWO B 1.25" optimized for ASI1600  ·  ZWO G 1.25" optimized for ASI1600  ·  ZWO R 1.25" optimized for ASI1600  ·  ZWO L 1.25" optimized for ASI1600

Accessory: ZWO EAF Electronic Focuser  ·  ZWO 8x 1.25" Filter Wheel (EFW)

Dates:Aug. 25, 2019Aug. 26, 2019Aug. 29, 2019

ZWO B 1.25" optimized for ASI1600: 57x60" (gain: 139.00) -10C bin 1x1
ZWO G 1.25" optimized for ASI1600: 57x60" (gain: 139.00) -10C bin 1x1
ZWO L 1.25" optimized for ASI1600: 104x60" (gain: 139.00) -10C bin 1x1
ZWO R 1.25" optimized for ASI1600: 61x60" (gain: 139.00) -10C bin 1x1

Integration: 4.7 hours

Darks: ~12

Flats: ~15

Bias: ~20

Avg. Moon age: 25.84 days

Avg. Moon phase: 17.64%

Bortle Dark-Sky Scale: 5.00

Temperature: 15.25 job: 2904417

RA center: 19h 40' 43"

DEC center: +10° 47' 6"

Pixel scale: 1.203 arcsec/pixel

Orientation: 352.384 degrees

Field radius: 0.952 degrees

Resolution: 4593x3372

Locations: Happy Frog Observatory, Monroe, Connecticut, United States

Data source: Backyard


The E-Nebula is a pair of dark nebula (B142 and B143) in the constellation of Aquila. E.E. Barnard described and designated these two nebula as B143 (northern region resembling a square with a missing side) and B142 (southern region). These two nebula together form a giant "E" in space with an apparent size equivalent to that of a full moon and is some 2000 light-years from Earth. The interstellar cloud that makes up the nebula stands out well against the heavy star field and like all molecular clouds can reach temperatures low enough where different types of stable molecules can exist. I can't get over all the stars in this region and this is after some tar reduction. Most of them appear yellowish but I suspect they are being masked a bit by the vast amount of gas and dust.

This image would have been a lot easier to process had I just collected more RGB data in place of the luminosity data. The luminosity looked good on its own but when I combined it with the RGB the stars seemed more bloated. However, the luminosity did enhance the dark nebula slightly and reduced the noise a bit. I created an RGB mask for the stars and combined the luminosity to the rest of the image. I am OK with how it turned out but if I were doing this again I would just collect more RGB and skip the luminosity altogether.



Kurt Zeppetello
License: None (All rights reserved)

Sky plot

Sky plot


The E-Nebula, 


            Kurt Zeppetello

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Imaged with APT