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NGC 2359- Thor's Helmet



NGC 2359 (Thor's Helmet): in Canis Major

RA = 7 hrs 18 min; Dec = -13 deg 13 min

Date & Site:

Combined data from 3/12/2010 and 2/17/2012; Little Blair Valley, CA

Conditions: calm; 45 degrees; average seeing


Telescope: Takahashi FSQ 106 (fl=540mm F5)
Mount: Losmandy G-11 with Gemini
Camera: ST-10XME; CFW10 with Astrodon 3nm Ha filter; Internal autoguiding


Exposures: 60 min each of OIII and SII (3/12/10) combined with 120 min Ha (3nm) and 30 min each of blue and green (2/17/12)

Narrowband data color mapped using Hubble palette (red=SII; green = Ha; blue=OIII)

FOV = 96 x 65 arc minutes

This emission nebula is located in the constellation Canis Major. The nebula is approximately 15,000 light-years away and 30 light years in diameter. An extremely hot giant Wolf-Rayet star (center of blue bubble area) ignites hydrogen and oxygen gas surrounding the star. Interaction with a large molecular cloud creates a bow shock (similar to the Bubble nebula) producing the round object resembling a helmet.

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