V5668 Sagittarii

It was discovered by John Seach of Chatsworth Island, New South Wales, Australia on 15 March 2015 with a DSLR patrol camera.

[4] The light curve for this event is very similar to the DQ Herculis intermediate polar, and it shows a coincident oscillation in X-ray flux with a period of 71±2 s due to rotation of the white dwarf.

The white dwarf and its companion star are surrounded by a dusty shell of ejected material.

[9] In 2016 Banerjee et al. showed that 107 days after the nova outburst, its dust-dominated SED was well approximated by an 850 K blackbody spectrum.

The angular diameter of the dust shell was estimated to be 42 milliarcsec which, along with the time since outburst and the measured expansion velocity of 530 km/sec, allowed the distance, 1.54 kpc, to be calculated.

The light curve of V5668 Sagittarii, plotted from AAVSO data
The location of V5668 Sagittarii (circled in red)