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Ibbo

IC63 Bi- colour

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Tweedledee

That looks superb Steve. :2thumbsup:


Your image inspired me to search out some interesting info about it...


The brightest star in the image is 6th mag HD6130, 1500 light years from us and about half a degree from the nebula. Gamma Cassiopiea is just outside the top left of the image. If you imagine the brighter parts of IC63 as an arrow, it points almost directly at Gamma about a third of a degree away. Gamma Cass is actually only several light years away from the nebula, but 600 Ly from us and is responsible for the nebulas visibility. IC63 is an example of a reflection and emission nebula. Gamma Cassiopieas light is both reflected from the interior and emitted by the ionised hydrogen around the brighter edges of the nebula excited by the shock wave from the stars intense outbursts. It is also highly likely that IC63 and nearby IC59, which is not in the image, actually originated from one of Gamma Cassiopieas ancient outbursts. This star is roughly 15 times the diameter and mass of our sun and is 50,000 times as luminous. It is known as an eruptive variable and rotates 150 times faster than our sun, a colossal 300 miles per second at its surface giving it a very pronounced equatorial bulge. From time to time at erratic intervals, it throws off gaseous material. In about 1935 it last underwent an eruptive cycle when it brightened by a third of a magnitude, then rapidly dropped to mag 3.4. Since then it has been brightening gradually and is now nearly back to its usual 2nd magnitude.


My new book "The Deep Sky Observer's Guide" say's that IC63 is visible faintly in a 12" to 14" scope as an elongated 8' x 4' patch of nebulosity if viewed with a UHC filter and 2nd mag Gamma is kept out of the field, but I'm sure it will also need a really dark sky. Apparently a 16" to 18" scope is required to see it as a fan shape.

Edited by Tweedledee

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Stephen

That is a great image Steve I like the detail

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