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OF THE ROGER N. CLARK

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VISUAL ASTRONOMY <strong>OF</strong> <strong>THE</strong> DEEP SKY<br />

NGC 6494 (M23) RA=17 56 .9 Oec=-19 01<br />

• < 7 .5<br />

• 7 .5-8.5<br />

• 8.5-9.5<br />

• 9.5-10.5<br />

• 10.5- 11.5<br />

• 11.5-12.5<br />

• 12.5-13.5<br />

. 13.5-14.5<br />

• 14.5-15.5<br />

Viewing distance<br />

25x: 64 100x:<br />

50x: 32 200x:<br />

>15.5 Sca 1 e= 2.1 3 arc-min<br />

APP ENDIX B: STAR CLUSTERS FOR FINDING YOUR LIMITING MAGNITUDE<br />

--<br />

NGC 6 4 94 (M23) RA= 17 56 .9 Oec=-19 01 (2000 .0)<br />

•<br />

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Viewing distance<br />

25x: 64 100x:<br />

50x: 32 200x:<br />

in cm<br />

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>15.5 Sca 1e= 2. 1 3 arc-min / cm<br />

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