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Observation by Graeme Coates: NGC2359 - Thor's Helmet (RGB+HOO)

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Graeme Coates


Graeme Coates


2020 Feb 01 - 00:00


2021 Apr 21 - 11:29



Planetarium overlay


Canis Major

Field centre

RA: 07h18m
Dec: -13°13'
Position angle: +90°11'

Field size

2°29' × 1°51'

  • Skywatcher Esprit 80ED
  • MI-250
  • STF-8300M
  • Chroma + Baader Filters




Target name

NGC2359 - Thor's Helmet


NGC2359 - Thor's Helmet (RGB+HOO)

About this image

This data was taken in Feb 2020 and I've been having a go at this data for some time now, but frequently landing up going back to square one - here is an RGB+HOO rendition of a well known nebula in Canis Major - NGC2359 or Thor's Helmet.

The nebula surrounds the massive, hot star WR7 - a Wolf-Rayet star that is sweeping up the interstellar medium wth the strong stellar outflows. The nebula is very bright in the [OIII] wavelengths as well as H-Alpha. In addition, in this wide field view, extended fainter hydrogen emission is also apparent. Also, to the above-right of NGC2359 is the smaller faint planetary nebula PHR J0719-1222.

The open cluster Haffner 6 sits above (east), and Berkeley 36 is below (to the west).

Taken from EEYE - Feb 2020. This is an RGB image, with HOO data brought into the image using PI's Pixelmath. There was very little SII data - it was swamped by HA/OIII so didn't really bring anything to the image.

Image capture: Paul Tribe, Graeme Coates

Processing: Graeme Coates


Baader Planetarium B 36mm: 14x600" -20C bin 1x1
Baader Planetarium G 36mm: 14x600" -20C bin 1x1
Baader Planetarium R 36mm: 15x600" -20C bin 1x1
Chroma Ha 3nm: 50x900" -20C bin 1x1
Chroma OIII 3nm: 34x900" -20C bin 1x1

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