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" ... magnitudes are related by the formula mT = C— 5 log d. The constant C, expressing the magnitude for a given diameter, or the diameter for a given magnitude, increases smoothly throughout the sequence. When the values of C are reduced to that for... "
The Observatory - Page 98
1927
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N.G.C. 6822: A Remote Stellar System

Edwin Hubble - 1925 - 556 pages
...the nebulae can be reduced to a standard type, and then a single formula expresses the relation for all nebulae from the Magellanic Clouds to the faintest that can be classified. When the minor diameter is used, the value of C is approximately constant throughout the entire sequence....
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The Astrophysical Journal, Volume 64

1926 - 416 pages
...the nebulae can be reduced to a standard type and then a single formula expresses the relation for all nebulae from the Magellanic Clouds to the faintest that can be classified. When the minor diameter is used, the value of C is approximately constant throughout the entire sequence....
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The Observatory, Volume 50

1927 - 430 pages
...interest from Mr. Hubble on Extra Galaetic Nebulat appears in the December number of the Attrophysical Journal. Those within reach of this Journal should...expressing a relation between all nebulae from the Magellanie clouds to the faintest that can be classified, which suggests that the nebulae are all of...
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Annual Report of the Director - Mount Wilson Observatory

Mount Wilson Observatory - 1917 - 616 pages
...sequence. When the values of C are reduced to that for a given type, a single formula represents all the nebulae from the Magellanic Clouds to the faintest that can be classified with the 100-inch reflector. Nuclear magnitudes as measured by Hopmann lead to the same results. It...
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