Nature February 1st 1877
The Binary Star Gamma Centaurus
While awaiting further measures of this fine double star, it
may be remarked that admitting the measures of Sir John Herschel in
1835/36 to require an alteration of 180
degrees, in order to render them comparable with those of Captain Jacob and Mr
Powell, the latest published angle measured by the latter observer in 1860,
indicates a motion in retrograde direction of upwards of 160 degrees between
1835/36 and 1860, the distance having increased by about 0.4 seconds.
The star will be in all probability one of comparatively
short period, and as such, deserves attention at the hands of southern
observers. The alteration of 180 degrees in Sir John Herschel’s measures is
quite justified by the near equality of the stars.
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