Koen, ChrisMaxted, P.F.L.2013-12-022013-12-022006Koen, C. & Maxted, P. (2006). Photometry of the magnetic white dwarf SDSS 121209.31+013627.7. Monthly Notices of the Royal Astronomical Society, 371(4): 1675-16800035-8711http://hdl.handle.net/10566/890The results of 27 h of time series photometry of SDSS 121209.31+013627.7 are presented. The binary period established from spectroscopy is confirmed and refined to 0.061 412 d (88.43 min). The photometric variations are dominated by a brightening of about 16 mmag, lasting a little less than half a binary cycle. The amplitude is approximately the same in V, R and white light. A secondary small brightness increase during each cycle may also be present. We speculate that SDSS 121209.31+013627.7 may be a polar in a low state.en© 2006 copyright Oxford University Press. This file may be freely used for educational purposes, as long as it is not altered in any way. Acknowledgement of the authors and the source is required.Binaries: closeStars: individual: SDSS 121209.31+013627.7Stars: low-mass, brown dwarfsStars: variables: otherArticle