V1028 Cyg (SU UMa-type dwarf nova) is reported to be undergoing a rare outburst as indicated by the following observations extracted from vsnet-obs reports.
1996 Aug. 5.051 <15.6 M. Biesmans
5.984 <15.1 M. Biesmans
7.048 <15.6 M. Biesmans
7.899 13.6 M. Biesmans
7.90 14.0 J. Pietz
The last reported outburst of V1028 Cyg occurred on 1995 July 28 (cf. vsnet-alert #166, 168). The discovery of superhumps during that outburst led to the present classification of this dwarf nova. Below is an extract from vsnet-alert 175, whose stress on the importance of detailed observations also applies to the present outburst.
> From the current (1995 July - Aug.) observations, we may now adopt 0.0626 > day as a superhump period of V1028 Cyg. This short superhump period can > be comparable to those of T Leo, VY Aqr and AQ Eri, all of which show > relatively infrequent (super)outburst activity. The low outburst frequency > of V1028 Cyg seems to consistent with what is expected from the observed > superhump period. Both T Leo and VY Aqr are known to show "double maxima", > so close monitoring of V1028 Cyg even after the end of present superoutburst > is recommended. > The origin of discordant period observed at the earliest stage of outburst > (i.e. longer period superhumps) is not still understood.Regards,
Dear Colleagues,
We, Ouda team, have observed V1028 Cyg between August 8.50 and 8.63. Time resolved observation shows that this object undergoes a fading with the rate about 0.58 mag/day. The mean magnitude of this object is V~13.95 (comp 14.06, seq: VSNET cht). No evidence of some variation was obtained.
This result seems to strengthen the suspection that this outburst must be a normal one, not a superoutburst.
Continuous observation of this interesting dwarf nova is encourged.
Best Regards,
Hajime Baba and Daisaku Nogami
Dear colleagues,
We, Ouda Team, confirmed the re-brightening of V1028 Cyg reported by Marc Biesmans (vsnet-obs 3385) as follows.
19960811.9951 Cyg V1028 13.5 135-137 (Marc) CYGV1028 960812.523 13.61 Oud
Is this outburst a superoutburst triggered by the recent normal one? Close monitoring is highly encouraged!
Best regards,
Daisaku Nogami
Aug. 10 image (left), Aug. 12 image (right)
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Preprint (Baba et al.)
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