Dear colleagues,
I have just completed the analysis of my unfiltered CCD observations of
ASASSN-25cu, obtained on Jun 27/28 and 28/29, 2025 at CBA Belgium
Observatory. The data was collected using a 0.40-m f/10.0 telescope and
QHY-268M CMOS camera under clear skies.
The light curve clearly reveals the presence of regular superhumps with an
amplitude of 0.25 mag, establishing ASASSN-25cu as a new SU UMa-type dwarf
nova. A period analysis, using the ANOVA, Lomb-Scargle,
Generalized-Lomb-…
[View More]Scargle and PDM methods (Peranso 3.1) yields a combined
superhump period of 0.0536 +/- 0.0014d. The object was measured at mag CV =
15.7 on Jun 29th.
Image calibration and photometry were performed using the latest release of
Phoranso.
Further observations are encouraged to refine the superhump period.
I will submit my observations to AAVSO, CBA and VSNET for further analysis.
With kind regards,
Tonny
---
Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.co <http://www.cbabelgium.com/> m
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.co <http://www.peranso.com/> m
PHORANSO: Photometric Reduction and Analysis Software
http://www.phoranso.com <http://www.phoranso.com/>
[View Less]
TCP J20131357+1154031: new SU UMa-type dwarf nova, possibly WZ Sge-type
K. Itagaki discovered TCP J20131357+1154031 on 2025-05-19 UTC at 14.7 mag
(unfiltered). The outburst amplitude is ~8.4 mag.
https://www.aavso.org/vsx/index.php?view=detail.top&oid=10848625
SAAO/Lesedi telescope, Josch Hambsch, and Sano-san have reported the
time-resolved observations. Josch's observations after 28 May show
single-peaked variation with a period of 0.05797(6) d, likely an ordinary
superhump. No clear …
[View More]modulations were presented before this.
Thus TCP J20131357+1154031 is a new SU UMa-type dwarf nova and a good
candidate for a WZ Sge-type dwarf nova, given its late appearance of
ordinary superhumps.
Best regards,
Yusuke
--
----------------------------------------------
South African Astronomical Observatory, Postdoc fellow
Yusuke TAMPO / 反保 雄介
EMAIL: tampo(a)kusastro.kyoto-u.ac.jp
ALT. EMAIL: yusuke(a)saao.ac.za
----------------------------------------------
[View Less]
ASASSN-25ce: new WZ Sge-type dwarf nova
ASAS-SN discovered ASASSN-25ce on 2025-05-28 UTC at 12.26 mag. The Gaia
counterpart is G~20.7 mag thus the outburst amplitude is ~8.5 mag.
The SAAO team and Berto Monard reported the time-resolved observations.
These light curves show a double-peak modulation with an amplitude of ~0.1
mag and a period of ~0.05537(1) d. The 5-sec resolution observations by the
SAAO/Lesedi telescope also show QPO-like modulation with 5--10 min.
Hence, ASASSN-25ce is a new …
[View More]WZ Sge-type dwarf nova, possibly with a
relatively higher inclination, while no clear eclipses are present.
Further time-resolved observations are encouraged.
Best regards,
Yusuke
--
----------------------------------------------
South African Astronomical Observatory, Postdoc fellow
Yusuke TAMPO / 反保 雄介
EMAIL: tampo(a)kusastro.kyoto-u.ac.jp
ALT. EMAIL: yusuke(a)saao.ac.za
----------------------------------------------
[View Less]