MBCAA Observatory

CK Aqr time keeping. Evidence for a ternary

Observed: 2005-20

Michel Bonnardeau
12 Feb 2021


Photometric measurements of the contact binary system CK Aqr are presented. 49 times of minimum were obtained between 2005 and 2020. Along with already published observations, this allows the derivation of an improved ephemeris. The resulting O-C diagram shows oscillations which are interpreted as the light time travel effect due to a third component, with a period of 8.2 years.

Plublished in OEJV issue 209 (30.12.2020): the article, with a photometry file and a ToM file.

Local copy (may not be available on-line).

Technical notes

Telescope and camera configuration.

Computer and software configuration.

Data processing.

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