Supernova Remnant HB3 in Cassiopeia (M.J. Post)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas)

Supernova Remnant HB3 in Cassiopeia, M.J. Post

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Supernova Remnant HB3 in Cassiopeia

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Supernova Remnant HB3 in Cassiopeia

For reference, the Fish Head Nebula is just off screen lower left, and field of view is about 1.6 x 1.9 degrees. I should have included more of the SNR to the north, but didn't know it extended higher until is was too late. I took 3.5 hours of data at each of the three popular narrowband wavelengths (H-alpha, OIII, and SII).

I was surprised to see how much signal and detail appeared through the SII filter. So instead of constructing a more traditional HOO image I tried SOO, with H mixed at a small percentage into the green and blue channels together with O. The small bright object top left is a planetary nebula IPHASX, strong in O and H light but invisible in S light.

HB3 (G132.7+1.3) was first determined to be a supernova remnant via radio astronomy in 1953, but I can find no explanation for the designation HB3, no doubt a slight to astronomer HB. The progenitor star for this event was most likely a Wolf-Rayet star of about 34 solar masses, and the implosion occurred nearly 50,000 years ago. The center of this remnant is about 9000 light years distant, and its size is 230 x 320 light years. According to Wikipedia it is responsible for several active, often-studied star-forming regions: W3, W4, and W5.

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Supernova Remnant HB3 in Cassiopeia

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