A Supernova Remnant in Cepheus - CTA1 (M.J. Post)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

A Supernova Remnant in Cepheus - CTA1, M.J. Post

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A Supernova Remnant in Cepheus - CTA1

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A Supernova Remnant in Cepheus - CTA1

The CTA1 supernova remnant is extremely faint, so I gathered 3.5 hours each through H-alpha, OIII, and SII filters with the RASA f/2.2 scope at DSNM. Here's the result, dominated by OIII emissions (teal-colored) in this HOO(S) false-color rendition. SII comes in second, and H-alpha a distant third for both extent and depth of signals. Field of view is about 2.9 x 2.2 degrees.

A rare gamma-ray pulsar, dark at visible and other wavelengths, is associated with this remnant. Its position is just left of frame center, but of course it is invisible. Its period of rotation is 0.317 milliseconds, slow for young neutron stars but normal for older ones. Still, that's not a bad rate of spin for a body 10 km in diameter with density one billion tons per cubic cm! Both the remnant and the pulsar are estimated to be about 13,000 years old.

Also in this frame is NGC 40, the Bowtie Nebula - the bright, compact structure embedded in the southeast section of the ~ circular SN remnant (lower left). It is extremely bright, so I was pleasantly surprised that it did not saturate any of my narrowband images, making it possible to pull out some of its structure. Zoom in a take a peek.

CTA1 is also known as G119.5+10.2.

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A Supernova Remnant in Cepheus - CTA1

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