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eJAAVSO

Precision of Parabolic Elements

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Emilia P. Belserene

Maria Mitchell Observatory, Nantucket, MA 02554

 

Received: 14 August 1989

 

Abstract

 

Formulae are given for a least-square parabola on an O-C diagram, with calculation of the

parabolic elements and their mean errors. The formulae are applied to TY Sct, an eleven-day

classical Cepheid. The resulting rate or change of period is +0.000032 day per year +-0.000016.

 

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