Hemisphere:  Southern  ·  Constellation: Eridanus (Eri)  ·  Contains:  IC 2118  ·  NGC 1788  ·  Part of the constellation Eridanus (Eri)  ·  The star 62Eri  ·  The star 63Eri  ·  The star 66Eri  ·  The star 68Eri  ·  The star Cursa (βEri)  ·  The star Rigel (βOri)  ·  The star λEri  ·  The star ψEri  ·  Witch Head nebula
Witch Head Nebula IC 2118 and Rigel, 



    
        

            Johnson Lo
Witch Head Nebula IC 2118 and Rigel
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Witch Head Nebula IC 2118 and Rigel

Witch Head Nebula IC 2118 and Rigel, 



    
        

            Johnson Lo
Witch Head Nebula IC 2118 and Rigel
Powered byPixInsight

Witch Head Nebula IC 2118 and Rigel

Technical card

Imaging telescopes or lenses: Borg 55FL

Imaging cameras: Sony A7S

Mounts: Kenko Skymemo S

Guiding telescopes or lenses: QHYCCD miniGuideScope

Guiding cameras: QHY5L-II-M

Focal reducers: Borg 7880

Software: Adobe Photoshop CS6  ·  PixInsight 1.8

Accessory: QHYCCD Polemaster


Dates:Aug. 25, 2017Aug. 27, 2017

Frames:STC Astro-Multispectra Clip Filter: 63x120" (2h 6') ISO3200

Integration: 2h 6'

Avg. Moon age: 4.78 days

Avg. Moon phase: 24.20%


Basic astrometry details

Astrometry.net job: 2091767

RA center: 5h 5' 41"

DEC center: -6° 48' 36"

Pixel scale: 8.411 arcsec/pixel

Orientation: 185.583 degrees

Field radius: 4.955 degrees


Resolution: 1245x2048

Locations: Xiao Fengkou Parking, Taichung, Taiwan

Description

Witch Head Nebula (IC 211

Constellation: Eridanus

Type: Reflection Nebula

Distance: 900 light years

It is an extremely faint reflection nebula believed to be an ancient supernova remnant or gas cloud illuminated by nearby supergiant star Rigel in Orion. The nature of the dust particles, reflecting blue light better than red, is a factor in giving the Witch Head its blue color (Wikipedia).

The data was obtained on a 3,000M high mountain in Central Taiwan. However, because of summer time, the object was only available for less than an hour before sunrise. Also, Rigel was extremely bright which caused internal reflection in my widefield telescope. I'm looking forward to my next trip to Taiwan to obtain data again.

Comments

Revisions

  • Witch Head Nebula IC 2118 and Rigel, 



    
        

            Johnson Lo
    Original
  • Final
    Witch Head Nebula IC 2118 and Rigel, 



    
        

            Johnson Lo
    B

B

Description: Further stretched background to show faint galaxies and HA region.

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Sky plot

Sky plot

Histogram

Witch Head Nebula IC 2118 and Rigel, 



    
        

            Johnson Lo