NGC 7023 - Iris Nebula
The Iris Nebula, also known as NGC 7023 and Caldwell 4, is a bright reflection nebula and Caldwell object in the constellation Cepheus. NGC 7023 is actually the cluster within the nebula that is itself embedded in surrounding fields of interstellar dust. It lies 1,300 light-years away and is six light-years across.
The dominant color of the brighter reflection nebula is blue, characteristic of dust grains reflecting starlight. Central filaments of the reflection nebula glow with a faint reddish photoluminescence as some dust grains effectively convert the star's invisible ultraviolet radiation to visible red light.
The dominant color of the brighter reflection nebula is blue, characteristic of dust grains reflecting starlight. Central filaments of the reflection nebula glow with a faint reddish photoluminescence as some dust grains effectively convert the star's invisible ultraviolet radiation to visible red light.
Imaging telescopes or lenses: Takahashi FSQ130ED
Imaging cameras: QSI 6120i
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: Sequence Generator Pro SGP (for capture) PHD 2 (guiding), Astro Pixel Processor & PixInsight,
Filters: Astrodon LRGB,
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 2804 x 1828
Dates: 6th & 22nd May 2019
Frames:
Astrodon R 23 x 5'
Astrodon G 21 x 5'
Astrodon B 21 x 5'
Astrodon L 22 x 5'
Total integration = 7 hours 15 mins.
Center (RA, Dec):(315.330, 68.153)
Center (RA, hms):21h 01m 19.157s
Center (Dec, dms):+68° 09' 09.081"
Size:46.1 x 30 arcmin
Radius:0.458 deg
Pixel scale:0.986 arcsec/pixel
Orientation:Up is 268 degrees E of N
Imaging cameras: QSI 6120i
Mounts: Takahashi EM 400 Temma 2M
Guiding telescopes or lenses: Takahashi FS60CB
Guiding cameras: QHY CCD QHY 5 II
Focal Extender / Reducer: None
Software: Sequence Generator Pro SGP (for capture) PHD 2 (guiding), Astro Pixel Processor & PixInsight,
Filters: Astrodon LRGB,
Accessories: Robofocus Focuser, ATIK EFW3
Original Resolution: 2804 x 1828
Dates: 6th & 22nd May 2019
Frames:
Astrodon R 23 x 5'
Astrodon G 21 x 5'
Astrodon B 21 x 5'
Astrodon L 22 x 5'
Total integration = 7 hours 15 mins.
Center (RA, Dec):(315.330, 68.153)
Center (RA, hms):21h 01m 19.157s
Center (Dec, dms):+68° 09' 09.081"
Size:46.1 x 30 arcmin
Radius:0.458 deg
Pixel scale:0.986 arcsec/pixel
Orientation:Up is 268 degrees E of N
Sky Map
Annotated Image
