AT ARA
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		Common Name: AT ARA Other Names: RA: Dec Constellation: Distance: Magnitude: Telescope: Meade LX200GPS 14 inch Camera: SBig ST-8 Filters: C Exposure: Date: Software acquisition: acquired with ccdsoft Processing Software: Maxim DL, Photometry tool Where: Warrumbungle Observatory, Coonabarabran, NSW, Australia Lat: 31 16 35.05 S, Long 149 11 33.99 E, Elevation 547 metres Notes: AT ARA is a Dwarf Nova. This is a white dwarf and late type M star in orbit around their common centre of gravity. The Late type star (secondary star) has filled its Roche lobe and there is a matter transfer throught the inner lagrangian point to an accretion disk around the white dwarf. A hot spot or shock front exists where the matter hits the disk. Every 90 days the system becomes unstable and the system brightens by several magnitudes - dwarf nova. The binary is edge onto our view so one can observe the 2 stars eclipsing as well as elements from the hot disk. The orbital period of this system is 1 hour 47 minutes and 28 seconds.
			Average of curves