V1108 Her: complex variations
Kiyota-san's second night observations on Jan. 25
showed complex variations. Although the observing window
was short, this may have been a part of early-superhump
variations.
PNVJ06245297+0208207: brightened further, Porb?
Itoh-san's new observations indicate that the object further
brightened to 12 mag but superhumps have become weaker
(amplitude typical for AM CVn stars).
Crimean Astrophys. Obs. team also reported the rising part
and superhumps were already present on Jan. 21 (good job!).
Preliminary analysis of the initial outburst yielded
a possible period of 0.03433(4) d. Amplitude 0.02 mag and
slower rise (similar to early superhumps).
PNVJ06245297+0208207: ordinary superhumps (AM CVn, P=0.0352 d)
Itoh-san obtained long time-resolved photometry on
Jan. 25 and detected singly peaked superhumps.
These humps were also present in Tordai's observation
on Jan. 24 and Vanmunster's on Jan. 23-24 (doubly humped).
Thanks to all these observers, the rising phase of
the superoutburst was covered. The superhump period
is 0.035185(8) d (stage A+B?). The period is longer than
the oribital period of GP Com and the lack of hydrogen
lines has been confirmed. Very important finding and
object.
V1108 Her: early superhumps or superhumps
Kiyota-san reported observations on Nov. 24.
0.2-mag variations were recorded. There were two
minima within one hour. If they are early superhumps,
the amplitude is large. Observations are strongly
encouraged.
PNVJ06245297+0208207: likely superhumps
Accoring to Tonny Vanmunster's observations, this AM CVn
object slightly brightened (16.7 mag) on Jan. 23 and showed
likely superhumps (period about 0.035 d).
Please continue observations. Unfortunately there was no
report between Jan. 13 and 22.
ASASSN-23ag: new SU UMa-type dwarf nova
Superhumps were present in Hambsch's data on Jan. 23.
Growing superhumps were likely present on Jan. 21-22
(Vanmunster and Hambsch). Current amplitude 0.05 mag.
Approximate period 0.056 d.
The WZ Sge-type is expected from the outburst amplitude
and the classification as such may become evident as more data
become available.
Dear colleagues,
I have just finished analysing my unfiltered CCD observations of
ASASSN-14fx, obtained on 2023, Jan 23/24 at CBA Extremadura Observatory
(Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear
skies.
The resulting light curve clearly shows the presence of regular superhumps
with an amplitude of 0.24 mag, establishing ASASSN-14fx as a new SU UMa-type
dwarf nova. A period analysis, using the ANOVA, Generalized-Lomb-Scargle,
PDM and Conditional Entropy methods (Peranso 3.0) yields a combined
superhump period of 0.0652 +/- 0.0006d. The object was at mag CV = 16.3 on
Jan 23rd.
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