Brief Biography And Popular Account of the Unparalleled Discoveries of T. J. J. See ..
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C. Pickering has derived a value of 21.0 magnitude for the faintest stars, by the system of photographic magnitudes in use at the Harvard College Observatory. Obviously there is some un- certainity in this value, but it probably is not extreme.
In answer to an inquiry as to the possibility of getting still fainter stars by prolonging the exposure. Professor Adams assures me that it can be easily done, the only limit being the brightness of the background of the sky ; but that with the clear air... of Mt. Wil- son this would not be reached till the exposure had extended over many hours. He adds that it takes about three times the expos- ure to obtain a star one magnitude fainter. From the data here supplied it seems certain that stars as faint as 21.0 magnitude may be photographed at Mt. Wilson, with the 60-inch reflector, and that by prolonging the exposure several additional hours or through whole nights, stars of 22.0 magnitude probably could be obtained.
It is therefore well established that stars 17 magnitudes fainter than the 225 helium stars, with average magnitude of 4.14, recently investigated at Lick Observatory, may now be photographed with more than one instrument; and the value of A = 2,512 used in our calculations is amply justified.
What to read after Brief Biography And Popular Account of the Unparalleled Discoveries of T. J. J. See ..?
You can find similar books in the "Read Also" column, or choose other free books by Webb, W. L. (William Larkin), B. 1856 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
C. Pickering has derived a value of 21.0 magnitude for the faintest stars, by the system of photographic magnitudes in use at the Harvard College Observatory. Obviously there is some un- certainity in this value, but it probably is not extreme.
In answer to an inquiry as to the possibility of getting still fainter stars by prolonging the exposure. Professor Adams assures me that it can be easily done, the only limit being the brightness of the background of the sky ; but that with the clear air... of Mt. Wil- son this would not be reached till the exposure had extended over many hours. He adds that it takes about three times the expos- ure to obtain a star one magnitude fainter. From the data here supplied it seems certain that stars as faint as 21.0 magnitude may be photographed at Mt. Wilson, with the 60-inch reflector, and that by prolonging the exposure several additional hours or through whole nights, stars of 22.0 magnitude probably could be obtained.
It is therefore well established that stars 17 magnitudes fainter than the 225 helium stars, with average magnitude of 4.14, recently investigated at Lick Observatory, may now be photographed with more than one instrument; and the value of A = 2,512 used in our calculations is amply justified.
What to read after Brief Biography And Popular Account of the Unparalleled Discoveries of T. J. J. See ..?
You can find similar books in the "Read Also" column, or choose other free books by Webb, W. L. (William Larkin), B. 1856 to read onlineMoreLess
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