This weeks light curve is of the star 2MASS J20175844+3756006 (MGAB-V3395). It is in our field around the bright star P Cyg and a member of the open cluster Dolidze 40. For clarity we show only our V and I-Band data.

Based on archival data from ZTF and ASAS-SN, Gabriel Murawski identified the object as a long period eclipsing binary (see the VSX details for this). The period is 227 days and the secondary eclipse occurs at 0.6 in phase, indicating an eccentric binary. The main eclipses are also clearly visible in our data, even if we do not yet have a good sampling for this field.

The eclipses are relatively long (Primary: 21% of the period, i.e. 48days; Secondary: 8% of the period, i.e. 18days) and show a complex structure. The star does have a significant infrared excess as well. This could hint that the eclipses are caused not just by the binary stars, but also by their accretion disks. This potentially makes the object very interesting as it would enable the detailed study of those disks. The next eclipse should occur in November/December this year and we will aim to follow this field with highest priority for HOYS during this time.