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A243598
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Decimal expansion of the fraction of the full solid angle subtended by a cone with the polar angle of 10^(-4) arcseconds.
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1
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5, 8, 7, 6, 1, 0, 7, 6, 3, 4, 7, 7, 4, 4, 7, 1, 4, 3, 7, 9, 0, 0, 7, 9, 0, 8, 9, 9, 4, 0, 6, 7, 7, 0, 0, 3, 1, 1, 3, 6, 2, 9, 8, 5, 2, 6, 1, 9, 5, 0, 6, 8, 5, 1, 9, 7, 0, 3, 7, 8, 7, 4, 8, 6, 2, 8, 5, 3, 4, 7, 6, 8, 4, 7, 7, 7, 1, 2, 6, 4, 6, 1, 7, 5, 7, 0, 8, 5, 7, 5, 6, 8, 6, 5, 2, 7, 5, 1, 2, 1, 6, 0, 9, 3, 7
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OFFSET
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-19,1
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COMMENTS
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The resolution limit of present astronomical instruments is about 200 micro arcseconds, corresponding to a solid angle cut out by a cone with polar angle of 0.0001 arcseconds. This constant, a, expresses the smallest resolvable solid angle as a fraction of the full solid angle. One might also say that at current top resolution, the full celestial sphere contains 1/a resolvable pixels.
See A234597 for more details on solid angle fractions.
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LINKS
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Center for High Angular Resolution Astronomy, CHARA
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FORMULA
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(1-cos((0.0001/60/60)*(Pi/180)))/2.
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EXAMPLE
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5.8761076347744714379007908994067700311362985261950685197...e-20
Inverse:
1.7018068118460879832481638181180323127935597506413188919...e+19
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PROG
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(PARI) (1-cos((0.0001/3600)*(Pi/180)))/2
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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