Abstract
OBSERVATIONS OF PROXIMA.—Union Observatory Circular, No. 70, contains some interesting notes on this star by Mr. Innes and Dr. van den Bos. The colour is orange or orange-red, the spectrum probably K, the visual magnitude 11–2, the photographic 13.0. The parallax is given as 0″90, which is larger than that deduced from the assumption that parallaxes and proper motions are proportional when compared with α-Centauri. Dr. van den Bos makes the interesting, but rather improbable, suggestion that the sun, Proxima, and α-Centauri form a straight-line solution of the three body problem. The parallax of the centre of gravity of the system would be 1″14. It is satisfactory that Dr. Alden will investigate the parallax of Proxima with the Yale Telescope at Johannesburg.
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Our Astronomical Column. Nature 119, 25 (1927). https://doi.org/10.1038/119025a0
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DOI: https://doi.org/10.1038/119025a0