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Additional info for Astronomical sketching : a step-by-step introduction
1 Sketching a Comet and Its Motion I will use a telescopic sketch of comet 73P-C/Schwassmann-Wachmann 3 as an example in this tutorial. This comet was relatively bright at the time of the observation at about 6th magnitude. Its beautiful, soft glow swept across the ﬁeld of stars like the expanding wake of a speed boat on glassy water. The pseudonucleus was stellar in appearance with an elongated bright spike extending to the southwest. The ﬂowing tail was striated with varying levels of luminosity and consisted of a bright, narrow, inner portion enveloped by a shorter, fainter, outer fan.
3. The dashed circle represents how I visualized this diameter on the sketch. Step 4: Sketching the ﬁrst layer of the coma With the size and proﬁ le of the coma in mind, lightly load your blending stump with graphite (see Using a Blending Stump on page 153). Take the blending stump and begin swirling it lightly, starting at the point you marked in Step 2. Using a delicate circular motion, proceed outward from the center to deﬁne the coma’s visible diameter. 4) As you approach the outer edge of the coma, decrease the pressure on the blending stump to the lightest possible touch.
Rapid and randomized motions seem to work best, creating a uniform smooth gray tone. If you feel that the tone is too light, simply erase the area with an Art Gum eraser, clean the eraser crumbs off with your brush, and use the sponge without applying any chalk. This will allow you to produce a slightly darker gray value, using any residual chalk that has built up on the sponge. 8 eyepiece and try to duplicate them as accurately as possible in your sketch. 7) Step 6 Touch up the crater contours with the sharpened white 2B Conté Crayon.