Hemisphere:  Northern  ·  Contains:  M 97  ·  M97  ·  NGC 3587  ·  Owl nebula  ·  PK148+57.1
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Exafilter Owl Nebula, 


            Edoardo Luca Radi...
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Exafilter Owl Nebula

Imaging telescopes or lenses: C9.25

Imaging cameras: SBIG ST-2000XM

Guiding cameras: 10Micron HPS System

Focal reducers: Astro-Physics Telecompressor CCDT67

Software: Pixinsight

Filters: Baader Planetarium OIII 8.5nm  ·  Baader Planetarium Ha 7nm  ·  Baader Planetarium Baader B  ·  Baader Planetarium Baader g  ·  Baader Planetarium Baader R  ·  Baader Planetarium Hb 8.5 nm

Dates:March 30, 2019

Baader Planetarium Baader B: 21x180" bin 1x1
Baader Planetarium Baader R: 21x180" bin 1x1
Baader Planetarium Baader g: 21x180" bin 1x1
Baader Planetarium Ha 7nm: 32x300" bin 1x1
Baader Planetarium Hb 8.5 nm: 30x300" bin 1x1
Baader Planetarium OIII 8.5nm: 31x300" bin 1x1

Integration: 10.9 hours

Avg. Moon age: 24.23 days

Avg. Moon phase: 28.57%

Mean SQM: 18.50

Astrometry.net job: 2677012

RA center: 11h 14' 46"

DEC center: +55° 1' 7"

Pixel scale: 0.895 arcsec/pixel

Orientation: 164.013 degrees

Field radius: 0.226 degrees

Resolution: 1460x1094

Locations: Castenedolo, Castenedolo, Italy

Data source: Backyard


Imaging from highly light-polluted skies is always a challenge.
RGB imaging is nearly impossible, narrow band imaging cannot reproduce "true" colors of objects...

... or not?

With the right technique one can get narrowband data from selected objects (emission nebulae) and recover star colors from broad band RGB images.

This image comes from the composition of 6 filters: RGB for star colors, H alpha, OIII and H beta for the nebula.

Unfortunately, due to the high Light Pollution, it was impossible to get better data for the dimmer object, but i'm quite happy of the result under a 18.5 mag/arcsec SQM sky



Edoardo Luca Radi...
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


Exafilter Owl Nebula, 


            Edoardo Luca Radi...

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Imagers of Italy
Narrowband imaging