Hemisphere:  Northern  ·  Constellation: Gemini (Gem)  ·  Contains:  NGC 2395  ·  NGC2395  ·  PK205+14.1  ·  Sh2-274
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Abell 21 in HO, 


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Abell 21 in HO

Imaging telescopes or lenses: Sky-Watcher QUATTRO-10CF 10" f/4 Newton Carbon

Imaging cameras: ZWO ASI 294MC Pro (cooled)

Guiding telescopes or lenses: Guidescope 60mm f=240mm

Guiding cameras: Datyson T7C Guidecam

Software: APP  ·  Noiseware Community Edition  ·  APT  ·  PHD2 Guiding

Filters: Optolong L-eNhance 2"

Accessory: GPU Optics Pal Gyulai CC

Dates:Feb. 13, 2021

Frames:Optolong L-eNhance 2": 72x300" (gain: 120.00) -10C bin 1x1

Integration: 6.0 hours

Darks: ~25

Flats: ~33

Flat darks: ~33

Avg. Moon age: 1.68 days

Avg. Moon phase: 3.16%

Bortle Dark-Sky Scale: 4.00

Temperature: -2.00

Astrometry.net job: 4230050

RA center: 7h 29' 1"

DEC center: +13° 14' 22"

Pixel scale: 0.959 arcsec/pixel

Orientation: 9.037 degrees

Field radius: 0.667 degrees

Resolution: 4136x2814

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Abell 21 or sh 2-274 is a nice planetary nebula in Gemini.

The first clear and moonless night this year was reserved for this target as I wanted to collect some data with my ASI 294MC and the Optolong L-eNhanced filter.
I managed to get 72x300 sec subs.
Surprisingly for me, there is a OIII-Signal (albeit very faint).

Some RGB-data will follow when the clouds go away ;-)