Page:Philosophical Transactions - Volume 095.djvu/145

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VI. An Investigation of all the Changes of the variable Star in Sobieski's Shield, from five Year's Observations, exhibiting its proportional illuminated Parts, and its Irregularities of Rotation; with Conjectures respecting unenlightened heavenly Bodies. By Edward Pigott, Esq. In a Letter to the Right Hon. Sir Joseph Banks, K.B. P.R.S.

 

Read February 7, 1805.

 

Bath, 1802.

The object of the first part of this Paper is a further in- vestigation of the periodical and other changes of brightness of one of the variable stars I discovered in 1795, that in Sobieski's shield, an account of which the Royal Society did me the honour of publishing in their Transactions. Those determinations being deduced from a few periods made near the time of discovery, must of course remain unsatisfactory, however exact the observations themselves may be, until confirmed by an additiortal set, or by others made at a greater interval of time; for which purpose I occasionally continued keeping a journal of its changes for near five years, and am happy to find that they have answered my expectation, parti- cularly by giving us an insight into its irregularities, as will be shewn hereafter.

 

Variable Star in Sobieski's Shield.

R.A. –– 279° 91/2' S. Declination 5° 56'

${\Bigl .}{\begin{matrix}\\\end{matrix}}{\Bigr \}}$ for the end of June, 1796

S 2