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The Horsehead Nebula / Barnard 33, 


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The Horsehead Nebula / Barnard 33

Imaging telescopes or lenses: Sky-Watcher Esprit 120ED Super APO Triplet

Imaging cameras: ZWO ASI 071MC PRO

Mounts: Orion Atlas Pro AZ/EQ  ·  SkyWatcher Pillar pier

Guiding telescopes or lenses: Sky-Watcher Evoguide 50 APO Refractor

Guiding cameras: ZWO ASI290mini monochrome

Software: Topaz Labs Topaz DeNoise 2.0.0  ·  N.I.N.A. 1.10  ·  Ascom EQMOD  ·  PixInsight  ·  Photoshop cc2018  ·  PHD 2

Filters: IDAS D2 lightpollution suppression 2" filter

Accessory: QHYCCD Polemaster  ·  Startech Industrial Hub 7 Ports  ·  AstroZap Dew Heater  ·  Pegasus Astro pocket powerbox  ·  skywatcher field flattener

Dates:Feb. 13, 2021

Frames: 35x180" (gain: 90.00) -15C bin 1x1

Integration: 1.8 hours

Darks: ~15

Flats: ~20

Flat darks: ~20

Avg. Moon age: 1.68 days

Avg. Moon phase: 3.16%

Bortle Dark-Sky Scale: 6.00

Temperature: -15.00

Astrometry.net job: 4258528

RA center: 5h 41' 2"

DEC center: -2° 26' 58"

Pixel scale: 1.151 arcsec/pixel

Orientation: -23.576 degrees

Field radius: 0.905 degrees

Resolution: 4685x3181

Locations: Home, Gothenburg, Sweden

Data source: Backyard


February and the end of January are often quite generous and bring some clear skies, like this year.
But it have been very cold, -17C, -18C for the most. I missed two clear nights due to technical problems, one was my fault and one was the cold (I changed filter and maybe some humidity came in between the filter and the camera, so after 15 subframes it started to developed a frost-line from the bottom to the middle of the frame (probably on the filter), the day after I dried up it with a hairdryer and the problem did not uppare again).
By the way, last clear night, (the 13 February), I was taking subs of the Leo Triplet after this object and noticed that the dew-heaters were not working and frost built up on both the telescope's and guidescope's lenses and on the dew-heater straps too.
I use a Pegasus pocket power box and Astrozap straps and never had this problem before. The temperature had dropped to -17, maybe too cold for them? Let me know if you too have had a similar problem.

Anyway, I managed to take 35 subframes of this beautiful object before it disappeared behind trees (the object is low on the horizon from my location and I have trees to the south with a narrow "window" between them.)
Clear skies to everyone and stay safe!



  • The Horsehead Nebula / Barnard 33, 


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    The Horsehead Nebula / Barnard 33, 



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The Horsehead Nebula / Barnard 33,