OF THE ROGER N. CLARK
OF THE ROGER N. CLARK
OF THE ROGER N. CLARK
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M96 (NGC 3368), GALAXY IN LEO<br />
R.A. 10h 46.8m, Dec. 1]0 49' (2000.0)<br />
Technical. M96 is an Sa-type spiral galaxy<br />
in the Leo Cluster of Galaxies , which includes<br />
M95, M65, M66, and M105. The<br />
group is around 30 million light-years distant.<br />
As with all type -Sa galaxies, a large<br />
central bulge dominates tightly wound spiral<br />
arms. M96 has a faint outer ring about 6<br />
arc-minutes in diameter.<br />
VISUAL ASTRONOMY <strong>OF</strong> <strong>THE</strong> DEEP SKY<br />
-<br />
Visual. M96 has a total magnitude of 1 0<br />
'<br />
2<br />
and a diameter f 6 by 4 arc-minutes, for a<br />
mean surface brightness of 22.3<br />
per square arc-second. Most of<br />
magnitudes<br />
the light<br />
concentrated in the central bulge,<br />
i<br />
however s<br />
and the surface brightness there is much<br />
higher. Through the 8-inch in good skies a<br />
dark lane was easily seen at medium pow :rs.<br />
I did not know it existed before making the<br />
observation. The lane is not visible in telescopes<br />
smaller than 4 inches.<br />
A VISUAL ATLAS <strong>OF</strong> DEEP-SKY OBJECTS<br />
---5' ---<br />
Photograph 0] M96. South is up. (Courtesy Evered<br />
Kreimer, The Messier Album.)<br />
Scale: 1.2 arc-min/cm<br />
8-inch fi ll.5 Cassegrain<br />
12.4mm Erfle (188X)<br />
Drawing 0] M96.<br />
Viewing Distance (cm)<br />
25 X: 115 200 X: 14<br />
50x :57 300x: 10<br />
100 X :29<br />
400 X : 7<br />
air mass: l.09, faintest star: 14.3 at zenith 188x'<br />
no tracking<br />
2/1 2/83 10:10-10:30 UT at Waianae ranch '<br />
Hawaii; R. Clark<br />
"<br />
128<br />
129
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