The Medusa Nebula is a faint and large planetary nebula which can be found in the constelation Gemini, close to Canis Minor.

It lies at a distance of 1.500 light years, has a diameter of about 4 light years and is considered a very old planetary nebula.
It has such a low surface brightness that it was only discovered in 1955.

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Image data

Object info
Name SH2-274 – The Medusa Nebula
Type Planetary nebula
Constellation Gemini
Right ascension 07h 29m 02s
Declination +13° 14′ 48″
Distance 1.500 ly
Other designations Abell 21
Image info
Image date Apr. 02, 2014
Light frames RGB (each) unbinned, 7nm Ha unbinned (Luminance)
Total integration info n/a
Dark frames info n/a
Flat frames info n/a
Bias frames info n/a
Software used CCDOps, CCDSoft, Maxim DL, Photoshop CS4
Processing CCDOPS was used for focussing. Image Acquisition was done using CCDSoft.
All separate frames were calibrated, aligned and stacked in MaxIm DL5 Pro.
Photoshop CS4 was used for further processing – curves adjustment, levels adjustment, etc.
Noel Carboni’s toolset was used as well (Local Contrast Enhancement, Deep Space Noise Reduction)
Equipment info
Telescope Orion Optics SPX 10″ Newton
Corrector Televue 2″ Paracorr coma corrector (FL: 1.380mm f/5.43)
Mount Losmandy G-11 Gemini
Camera SBIG ST-8300M
Guide camera Astrolumina ALccd5-II (Mono)
Guide scope Celestron 60/700 Achromat
Autoguide software PHD Guiding
Filters Baader 2″ 7nm Ha, Baader 2″ RGB + IDAS LPS-P2
Location Landgraaf, The Netherlands
Image comments

Object definately needs more integration time, especially in H-alpha.