Hemisphere:  Northern  ·  Constellation: Gemini (Gem)
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Abell 21. Medusa Nebula, 



    
        

            Vlad Onoprienko
Abell 21. Medusa Nebula
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Abell 21. Medusa Nebula

Technical card

Imaging telescopes or lenses: 9" MK "Santel"

Imaging cameras: QSI 640i

Mounts: Sky-Watcher EQ6 Pro

Focal reducers: 0,58x STF

Filters: Baader L  ·  Astrodon O-III 3nm  ·  Baader Planerarium 7 nm H-Alpha  ·  Baader RGB Filters

Accessory: Starlight Xpress Off Axis Guider  ·  Starlight Xpress Lodestar  ·  Starlight Xpress Fliter Wheel


Dates:Jan. 1, 2015

Frames:
Baader Planerarium 7 nm H-Alpha: 40x1800" bin 2x2
Baader L: 15x720" bin 1x1
Astrodon O-III 3nm: 22x1800" bin 2x2
Baader RGB Filters: 70x300" bin 2x2

Integration: 39.8 hours

Avg. Moon age: 11.20 days

Avg. Moon phase: 86.28%


Basic astrometry details

Astrometry.net job: 1799282

RA center: 7h 28' 51"

DEC center: +13° 20' 27"

Pixel scale: 0.896 arcsec/pixel

Orientation: 4.130 degrees

Field radius: 0.341 degrees


Resolution: 1984x1896

Data source: Traveller

Description

Data obtained in January-February 2015.
L - 180 min.
Ha – 1200 min.
OIII - 660 min.
R – 115 min.
G – 120 min.
B – 115 min.

(L+Ha+OIII):(R+Ha):(G+OIII):(B+OIII).
Total 40 hours.
Narrowband images were obtained in the red zone.

Comments

Sky plot

Sky plot

Histogram

Abell 21. Medusa Nebula, 



    
        

            Vlad Onoprienko