Dear colleagues,
I have just finished analysing my unfiltered CCD observations of
ASASSN-22ho, obtained on 2022, June 02/03 at CBA Belgium Observatory, using
a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies.
Regular superhumps with an amplitude of 0.35 mag are very clearly visible in
the resulting light curve, establishing ASASSN-22ho as a new SU UMa-type
dwarf nova. A period analysis using the ANOVA, Lomb-Scargle,
Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined
(long) superhump period of 0.0902 +/- 0.0025d. The object was at mag CV =
16.5 on Jun 03rd.
I will send my observations to AAVSO, CBA and VSNET for further analysis.
Best regards
Tonny
---
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.com
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com
Dear colleagues,
I have just finished analysing my unfiltered CCD observations of TCP
J22561804+4109534, obtained on 2022, July 04/05 at CBA Belgium Observatory,
using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies.
I have been observing this object during multiple nights between June 27th
and now. On all previous nights, no obvious modulations were visible in the
light curve, except for last night when superhumps with an amplitude of 0.14
mag became very clearly visible. A period analysis using the ANOVA,
Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields
a combined superhump period of 0.0650 +/- 0.0011d. The object was at mag CV
= 15.3 on Jul 05th.
The superhump profile shows no signs of a double-waved pattern, and I could
not detect early superhumps in my data. Yet, the large outburst amplitude of
~7.4 mag, and the long time for superhumps to develop (approx. 9 days) make
this a very likely WZ Sge-type dwarf nova. Follow-up observations are
recommended to further track the evolution of the superhumps.
I will send my observations to AAVSO, CBA and VSNET for further analysis.
Best regards
Tonny
---
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.com
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com
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ASASSN-22jz: revised period of early superhumps
Using the period of ordinary superhumps, I re-analyzed
the data reported in [vsnet-alert 26907]. The correct
period of early superhumps was an one-day alias
to vsnet-alert 26907. P(ESH)=0.05700(3) d.
PS1-3PIJ035747.16-063851.1 = Gaia DR3 324488617195639360 = ASASSN-22kc = ZTF19abuskjw: new SU UMa-type dwarf nova
Josch Hambsch and Itoh-san have reported observations.
The object shows superhumps with a period of 0.05761(3) d
(amplitude 0.10 mag).
MASTER OT J001204.00-412337.4: rebrightening
Josch Hambsch has detected a rebrightening on Aug. 17.
Having unusual outburst property, this object deserves
continuous attention and time-resolved photometry.
ASASSN-22jz: new WZ Sge-type dwarf nova
Berto Monard has reported observations on two nights.
The object was fading rather rapidly (0.3 mag/d),
probably in viscous fading phase.
Although there were much irregularity, I could detect
a period of 0.05404(4) d (double wave, 0.035 mag).
Although the profile is not very typical for early superhumps,
the period appears to be real based on the appearance of
one-day aliases. The rather unusual profile of
early superhumps a result of their low amplitude and
overlapping irregularity. Considering the outburst
amplitude and peak M_V, this object can be identified
to be a WZ Sge star.
MASTER OT J001204.00-412337.4: strange behavior
Josch Hambsch has reported new observations.
The object started fading rapidly on Aug. 8.
The duration of the superoutburst (8 d) is
too short for a WZ Sge star. Observations of subsequent
behavior are very important (the object still shows
superhumps).