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^ abHerschel, John Frederick William; South (1824), “Observations of the Apparent Distances and Positions of 380 Double and Triple Stars, Made in the Years 1821, 1822, and 1823, and Compared with Those of Other Astronomers; Together with an Account of Such Changes as Appear to Have Taken Place in Them Since Their First Discovery. Also a Description of a Five-Feet Equatorial Instrument Employed in the Observations”, Philosophical Transactions of the Royal Society of London114: 322-323, Bibcode: 1824RSPT..114R...1H
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^ abESA (1997), The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission, ESA SP Series, 1200, Noordwijk, Netherlands: ESA Publications Division, Bibcode: 1997ESASP1200.....E, ISBN9290923997