Stephen Hovell observes superoutburst of dwarf nova NSV 35

The far southern dwarf nova NSV 35 in Tucana (00:06:33.51, –69:00:33.7) was classified as a U Geminorum-type variable (UG, quite often called dwarf novae) with a range of 14.1 – 16.5 V.

On 2017/10/15 10:13:00 UTC Stephen Hovell observed NSV 35 through his 28” reflector “Kororia” and estimated it at magnitude 13.3. This was significantly brighter than all previous observations including his 15.1 estimates on 2017/07/28 18:07:00 UTC and 2017/09/14 10:48:00 UTC.

Subsequent estimates by Stephen and Rod Stubbings and CCD observations by AAVSO members Franz-Josef Hambsch and Gordon Myers (Figure 1) confirmed the superoutburst which peaked at 12.469V on 2017/10/18 09:48:10 UTC. The CCD time series showed superhumps with period of about 0.08d (Figure 2).

NSV 35 is now recorded in AAVSO’s Variable Star Index (VSX) as a SU Ursae Majoris-type variable (UGSU), with a range of 12.7 – 16.5V and a period of 0.079d (114 min).

Congratulations Stephen, your perseverance has been rewarded. Observers are strongly urged to monitor NSV 35 for future superoutbursts.

Figure 1. Recent Visual (open circles) and V (green squares) observations of NSV 35 from AAVSO’s Enhanced Light Curve Generator (LCG).
Figure 1. Recent Visual (open circles) and V (green squares) observations of NSV 35 from AAVSO’s Enhanced Light Curve Generator (LCG).
Figure 2. CCD time series by Gordon Myers showing superhumps.
Figure 2. CCD time series by Gordon Myers showing superhumps.

 

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