Barnard's Comet, formally designated as C/1891 T1, is a faint non-periodic comet that was observed through telescopes in late 1891. It is one of 16 comets discovered by Edward Emerson Barnard.
Orbit
William Wallace Campbell published the first orbital calculations for the comet, using positions obtained from the Lick Observatory between 3–5 October 1891.[6] These were further refined by Campbell himself a year later,[7] alongside other astronomers, Elizabeth B. Davis,[8]Adolf Berberich and R. Froebe, where they determined a perihelion date of 13 November 1891.
In 1894, while also working out the ephemerides for 489P/Denning (1894 I), John Russell Hind improved C/1891 T1's orbit by using positions obtained from the Cordoba Observatory between 20 October and 4 December 1891, resulting in a revised perihelion date of 14 November 1891.[9]Henry A. Peck provided the comet's definitive orbit in 1903, where he determined two different trajectories, an elliptical orbit with an orbital period of approximately 54,400 years, and a parabolic trajectory. However, the residuals for the elliptical orbit solution were rather large, thus the latter parabolic trajectory is favored for the comet.[3]
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