Hemisphere:  Northern  ·  Constellation: Perseus (Per)
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California Nebula Detail, 


            Steve Milne
California Nebula Detail
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Technical card

Imaging telescopes or lenses: TEC-140

Imaging cameras: QSI 690 WSG-8

Mounts: 10 Micron GM2000 HPS II UP

Guiding telescopes or lenses: TEC-140

Guiding cameras: Starlight Xpress Lodestar X2

Focal reducers: TEC Field Flattener

Software: Sequence Generator Pro  ·  Adobe Photoshop 6 CS  ·  Open PHD PHD 2.5  ·  Pixinsight 1.8

Filters: Astrodon OIII 3nm  ·  Astrodon SII 3nm  ·  Ha 3nm

Dates:Jan. 19, 2021

Ha 3nm: 27x1200" bin 1x1
Astrodon OIII 3nm: 21x1200" bin 1x1
Astrodon SII 3nm: 21x1200" bin 1x1

Integration: 23.0 hours

Avg. Moon age: 6.15 days

Avg. Moon phase: 36.99%

Basic astrometry details

Astrometry.net job: 4213529

RA center: 4h 0' 56"

DEC center: +36° 32' 38"

Pixel scale: 0.744 arcsec/pixel

Orientation: 179.819 degrees

Field radius: 0.442 degrees

Resolution: 2672x3344

Locations: E-EyE, Fregenal de la Sierra, Extremadura, Spain

Data source: Own remote observatory

Remote source: e-EyE Extremadura


The California Nebula is a large emission nebula that is around 1,000 light years away in the constellation of Perseus. The nebula has an elongated shape that resembles that of California, hence the nomenclature.

The gasses in the nebula are excited by the star Xi Persei (Menkib).

The nebula occupies around 2.5° of the night sky. We photographed a small section of the nebula (around 0.7° x 0.56°) between 22 November 2020 and 19 January 2021.

Capture details are as follows:

Telescope: TEC 140
Camera: QSI 690
Filters: Astrodon
Mount: 10 Micron GM2000HPS

SII: 21 x 1200s
Ha: 27 x 1200s
OIII: 21 x 1200s

A total of 23 hours exposure.

Data: Steve Milne & Barry Wilson
Processing: Steve Milne