MM Hya observation at SAAO Date: Thu, 17 May 2001 22:45:33 +0200 (SAST) From: Brian Warner <warner@artemisia.ast.uct.ac.za> Subject: Outburst of MM Hya Patrick Woudt and I have been observing the current outburst of MM Hya with high speed photometry on the 1.0-m reflector at the South African Astronomical Observatory. On 15 May it had a double humped profile with a poorly determined period of about 80 mins (and almost all the power in the first harmonic). Last night (May 16) it had a very low modulation (about 0.1 mag range) at a period of about 80 mins (we only observed it for that length of time). Tonight superhumps with a peak-to-peak range of about 0.3 mag have appeared. Our preliminary superhump period is 84.60 mins, which is 2.0% longer than the orbital period of 82.93 mins given by Misselt and Shafter (AJ 109, 1757, 1995). If anyone else is observing this outburst (we are unlikely to observe it further) we would be happy to combine observations. Regards, Brian Warner