Thor's Helmet Nebula (NGC 2259)
A bright nebula that surrounds, and has been blown off by
the Wolf-Rayet star GSC 5407:3417 –
the brightest star visible within the nebulosity. Although similar in nature
to the Bubble Nebula, interactions
with a nearby large molecular cloud are thought to have contributed to the
more complex shape and curved bow_shock
structure of Thor's Helmet. It measures some 30 light-years across and lies
in the constellation Canis Major.
||8' × 8'
||about 15,000 light-years
||R.A. 07h 18m 36.0s
Dec: -13° 12' 00"
AND STAR CLUSTERS