Page 605 - 89 history of astronomy_opt
P. 605
has been done by S. W. Burnham,[14] at
the Lick Observatory. The shortest period
ˆ
he found was eleven years (I Pegasi). In the
case of some of these binaries the parallax
has been measured, from which it appears
that in four of the surest cases the orbits are
about the size of the orbit of Uranus, these
being probably among the smallest stellar
orbits.
605
