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Updated: May 16, 2025
The orbit in 42 Comæ Berenicis is a very small one, so that even when the components are at their greatest distance apart they can not be separated by a five-or six-inch glass.
The binary 42 Comæ Berenicis is too close for ordinary telescopes, but it is highly interesting as an intermediate between those pairs which the telescope is able to separate and those like beta Aurigæ which no magnifying power can divide, but which reveal the fact that they are double by the periodical splitting of their spectral lines.
Here the magnitudes are both six, distance 0.65", p. 3°. Hall assigns a period of forty years to this star. The assemblage of close binaries in this neighborhood is very curious. Only a few degrees away we find one that is still more remarkable, the star gamma. What has previously been said about 42 Comæ Berenicis applies in a measure to this star also.
In memory of Berenice and Ptolemy, he named his son by Antigone, Ptolemy, and having built a city in the peninsula of Epirus, called it Berenicis.
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