Thor’s Helmet, NGC 2359

Thor’s Helmet in Canis Major is about 15,000 light years distant. A large bright star near the helmet’s center has created this interstellar bubble by the force of its “stellar wind”. However, this star, known as a Wolf-Rayet star, may go supernova in the relatively near astronomical future. In the meantime, we can continue to enjoy images of NGC 2359. This image was created by first assembling a simple RGB from the 2 hours/channel RGB data. The H-alpha data was layered over the red in Photoshop’s lighten mode; the same with the OIII data for the green and blue channels. This allowed us to create an image with RGB stars but enhanced nebula detail from the H-alpha and OIII data. Then a composite (H-alpha+OIII) layer was pasted over the (R+Ha)(G+OIII)(B+OIII) image. The opacity of the composite layer was reduced somewhat to allow the RGB stars to shine through. The star appearance was kept relatively subdued, so as not to detract from the nebula.

Credit:

SSRO/PROMPT/CTIO

About the Image

Id:noaoann10014a
Type:Observation
Release date:June 8, 2010
Related announcements:noaoann10014
Size:2826 x 2040 px

About the Object

Name:NGC 2359, Thor’s Helmet
Constellation:Canis Major
Category:Nebulae

Image Formats

Large JPEG
1.1 MB
Screensize JPEG
218.9 KB

Zoomable


Wallpapers

1024x768
256.2 KB
1280x1024
349.3 KB
1600x1200
457.6 KB
1920x1200
513.0 KB
2048x1536
667.2 KB

Coordinates

Position (RA):7 18 34.10
Position (Dec):-13° 20' 47.05"
Field of view:19.16 x 13.83 arcminutes
Orientation:North is 90.0° left of vertical


Colors & filters

BandWavelengthTelescope
Optical
OIII
502 nmPROMPT-1
CCD
Optical
B
435 nmPROMPT-1
CCD
Optical
G
475 nmPROMPT-1
CCD
Optical
OIII
502 nmPROMPT-1
CCD
Optical
H-alpha
656 nmPROMPT-1
CCD
Optical
R
625 nmPROMPT-1
CCD