V486 Ophiuchi / V486 Oph
Light curve of the long period variable V486 Ophiuchi / V486 Oph.
This star is a field star of the eclipsing binary V3288 Oph, which I have been observing for a number of years and can be found here on this website.
This star is a field star of the eclipsing binary V3288 Oph, which I have been observing for a number of years and can be found here on this website.
The following light curve and phase diagrams were constructed from photometry of images taken with two different systems, the Open University 14 inch Schmidt-Cassegrain COAST MkII telescope prior to 2021 July 8, and subsequently with the replacement COAST Mk III telescope, a 17 inch/42 cm aperture CDK17 Corrected Dall-Kirkham. All images used a V filter, and all photometry used the same comparison and check stars.
The GCVS lists this as an L type variable but does not give a period, while the AAVSO VSX also lists it as an L type variable but gives a period of 200.73567 days(!). [Both accessed 2023 December 9.]
The closest best fit period to this period for my data alone is 186 days, see below.
The closest best fit period to this period for my data alone is 186 days, see below.
The ASAS-SN Variable Stars Database gives a period of about 102 days for its own data set. Plotting my own data with the best fit period closest to this, which is 107 days, generates the following phase diagram.
Notwithstanding the questionable precision of some catalogues (to less than one second), there is some doubt over this star's period. While V3288 Oph remains in my observing program then this variable will also be followed.
[This page updated 2023 December 9]