Hemisphere:  Southern  ·  Constellation: Scorpius (Sco)
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The Dark Tower, 



    
        

            Todd
The Dark Tower
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The Dark Tower

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)
Getting plate-solving status, please wait...
The Dark Tower, 



    
        

            Todd
The Dark Tower
Powered byPixInsight

The Dark Tower

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Technical card

Imaging telescopes or lenses: Skywatcher 100ED F9 APO Skywwtcher ED100

Imaging cameras: ZWO ASI1600MM Pro

Mounts: SkyWatcher EQ6R Pro

Guiding telescopes or lenses: ZWO 30F4 Guidescope

Guiding cameras: QHYCCD QHY5L-II-M

Focal reducers: Skywatcher 0.85x Focal Reducer 100ED

Software: Pixinsight 1.8  ·  GIMP

Filters: ZWO OIII 36mm  ·  ZWO Ha 36mm  ·  ZWO B 36mm  ·  ZWO G 36mm  ·  ZWO R 36mm


Dates:May 29, 2020

Frames:
ZWO B 36mm: 20x300" (1h 40') (gain: 75.00) bin 1x1
ZWO G 36mm: 10x300" (50') (gain: 75.00) bin 1x1
ZWO Ha 36mm: 20x600" (3h 20') (gain: 200.00) bin 1x1
ZWO OIII 36mm: 16x600" (2h 40') (gain: 200.00) bin 1x1
ZWO R 36mm: 10x300" (50') (gain: 75.00) bin 1x1

Integration: 9h 20'

Darks: 20

Flats: 20

Avg. Moon age: 6.71 days

Avg. Moon phase: 42.88%

Bortle Dark-Sky Scale: 5.00


Basic astrometry details

Astrometry.net job: 3618504

RA center: 16h 46' 42"

DEC center: -41° 12' 18"

Pixel scale: 1.000 arcsec/pixel

Orientation: 246.028 degrees

Field radius: 0.525 degrees


Resolution: 2694x2652

Data source: Backyard

Description

My first Cometary Globule "birthday candle" to celebrate 1 year in astrophotography. Imaged in 9.4hrs all last night.

Just west of the #PrawnNebula lies the #OpenCluster of OB type stars, #NGC6231 (not pictured).

Forces from the #stars in this cluster are making themselves known in the nebulosity lying 100 light years away (about a full field of view "above" the field shown), shoving the mostly hydrogen gas and dust away in streams resembling the tail of a comet, or in this case, a dark tower.

100 light years!

Check out the reflection nebulae inside the tower.

Didn't even try to remove the haloes, apparently I'm needing to save up for a different set of filters. If it were only my real birthday haha!

Nebulosity is a HOO/RGB blend

Stars are HaRGB

Update 21/6/20

Nebulosity now LRGBH(S)OO, with added exposure in RGB, Oiii and the inclusion of Sii.

Ha 20x 600s

Oiii 20x 600s

Sii 28x 600s

R 25x 300s

G 25x 300s

B 25x 300s

Luminance created from an SHO version.

Comments

Revisions

  • The Dark Tower, 



    
        

            Todd
    Original
  • Final
    The Dark Tower, 



    
        

            Todd
    B

B

Description: Added to RGB and Oiii exposure, and collected Sii exposure also. Made a false luminance from an SHO version I'll upload separately. Nebulosity is now LRGBHOO and stars still RGB.

Uploaded: ...

Sky plot

Sky plot

Histogram

The Dark Tower, 



    
        

            Todd