A Handbook of Active Filters by D.E. Johnson, etc.

By D.E. Johnson, etc.

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Minkowski, R. , 131, 537, 1960. 2. Sabbadin, F. & Harnzaoglu, E. , 197, 363, 1981. A. 35° Outside this is an oval disc of much fainter matter, not quite symmetrical with the nucleus, with very vague traces of a ring formation on the southeast. Modern high resolution CCD images have been obtained by Louise & Pascoli (ref. 1); they infer from these, and other spectroscopic studies, that NGC 1535 consists of two isothermal shells which are approximately represented by 3axis ellipsoids. According to Sabbadin et al.

20. A. J. , 69, 495, 1989. 21. Tylenda, R. ; Astron. Astrophys. Supp. , 77, 39, 1989. 22. Zijlstra, A. ; Kapteyn Institute Preprint No. 018, 1989. 3 Extended Notes NGC40 Curtis (1918) described NGC 40 thus: The nebula resembles a truncated ring, from the ends of which extend much fainter wisps. A. 0 14 , while the total length along this axis is about 60/1. This basic description is still valid today. Curtis mentioned the existence of faint wisps beyond the main body of the nebula; one of these is particularly noteworthy, extending at a tangent in an easterly direction from the N end of the nebula.

Because planetary nebulae come in a tremendous range of sizes and surface brightness, there cannot be a single standardized drawing technique. We will have to generalize. First, one might start at low-to-medium power and sketch the position and orientation of the nebula against the stellar background. Next, switch to high power to record nebular detail. " A myth has arisen among amateur astronomers that the use of high powers is counterproductive as it "spreads the light" and reduces the object's contrast.

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