the two lately discovered celestial Bodies . 227 
orbits of these new stars, they move in ellipses which are not 
very excentric. 
Nor are the situations of the planes of their orbits so much 
unlike those of the planets, that we should think it necessary 
to bring them under the third article of comets, which leaves 
them quite unlimited. 
In the fourth article, relating to the direction of their motion, 
these stars agree with planets, rather than with comets. 
The fifth article, which refers to the atmosphere of comets, 
seems to point out these stars as belonging to that class; it 
will, however, on a more particular examination, appear that 
the difference is far too considerable to allow us to call them 
comets. 
The following account of the size of the comas of the smallest 
comets I have observed, will shew that they are beyond com- 
parison larger than those of our new stars. 
Nov. 22, 1781. Mr. Pigott’s comet had a coma of 5 or 6 f 
in diameter. 
Nov. 2 9, 1783. Another of Mr. Pigott's comets had a coma 
of 8' in diameter. 
Dec. 22, 1788. My sister's comet had a coma of 5 or 6 ' in 
diameter. 
Jan. 9, 1790. Another of her comets was surrounded by 
haziness of 5 or 6 ' in diameter. 
Jan. 18, 1790. Mr. Mechain's comet had a coma of 5 or 6 ‘ 
in diameter. 
Nov. 7, 1795. My sister's comet had a coma of 5 or 6 ' in 
diameter. 
Sept. 8, 1799. Mr. Stephen Lee's comet had a coma of not 
less than io' in diameter, and also a small tail of 15' in length. 
