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Abell 6 and HFG1 in Cassiopea, 


            Valts Treibergs
Abell 6 and HFG1 in Cassiopea

Abell 6 and HFG1 in Cassiopea

Technical card

Resolution: 2648x1961

Dates:Sept. 6, 2018Sept. 7, 2018Sept. 8, 2018

Astronomik CLS-CCD 2": 16x300" -30C bin 1x1
Astronomik Ha-CCD 12nm 2": 22x300" -30C bin 1x1
Astronomik Hb-CCD 12nm 2": 20x60" -30C bin 1x1
Astronomik O3-CCD 12nm 2": 36x300" -30C bin 1x1

Integration: 6.5 hours

Flats: ~15

Bias: ~15

Avg. Moon age: 26.97 days

Avg. Moon phase: 8.08%

Bortle Dark-Sky Scale: 2.00 job: 2255054

RA center: 3h 1' 21"

DEC center: +64° 40' 19"

Pixel scale: 1.751 arcsec/pixel

Orientation: 195.118 degrees

Field radius: 0.801

Locations: MAS Long Lake Conservation Center, Palisade, MN, United States

Data source: Traveller


Abell 6 (PK 136 +04.1) is a typical faint bubble-like planetary nebula on the left. Both lie in Cassiopeia.

HFG1 (Heckathorn-Fesen-Gull 1) is a larger and older planetary nebula first uncovered in 1982. The interesting thing of this nebula is that it shows a leading edge shock wave ahead of the bubble as it plows through the interstellar dust. Even deeper images in Ha wavelengths actually show a comet-like tail. I barely could detect that in my Ha stack if I stretched it a lot.

Subs: 16x5min CLS (luminance), 20x1min Hb, 22x5min Ha, and 36x5min O3. 6.5 hours total exposure over 3 nights at LLCC. At least 2 hours of subs were thrown out due to the variable sky and windy conditions.

Captured with APT and processed in Pixinsight


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Valts Treibergs
License: Attribution-NonCommercial-ShareAlike Creative Commons

Sky plot

Sky plot


Abell 6 and HFG1 in Cassiopea, 


            Valts Treibergs

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Narrowband imaging