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
____________________________________________________________
Center for Backyard Astrophysics (CBA) mailing lists
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Hi Marcos and All,
As noted below, the RCB star V854 Cen may have commenced to decline (10x50mm binoculars):
CENV854 20220717.386 74 WPX
CENV854 20220724.420 73 WPX
CENV854 20220727.410 74 WPX
CENV854 20220728.432 75 WPX
CENV854 20220730.368 81 WPX
Also, the RCB star S Aps is also fainter than usual tonight and may have commenced to decline (20x80mm binoculars):
APSS 20220717.418 95 WPX
APSS 20220724.465 97 WPX
APSS 20220727.454 97 WPX
APSS 20220728.403 96 WPX
APSS 20220730.429 100 WPX
Further observations will confirm if either or both of these stars continue into a deep decline.
Tks and regards
Peter Williams
Heathcote NSW
From: 'Peter Williams' via Variable Stars South [mailto:VariableStarsSouth@googlegroups.com]
Sent: Saturday, 30 July 2022 5:37 PM
To: VariableStarsSouth(a)googlegroups.com
Subject: RE: [VSS] V0854 CEN fading?
Hi Marcos,
V854 Cen is perhaps the most active of the RCB stars and would seem ready for a deep decline, if not overdue. I have noticed its SR variations having a marginally greater amplitude during June and July and that has in previous cases led to a decline onset. My most recent observation was on Thursday, July 28.432UT at magnitude 7.5. That is marginally fainter than usual and with your most recent magnitude of 7.9, it may well indicate the onset of a decline.
It will sometimes stall near magnitude 8 and return to maximum but if it goes below magnitude 8.5 then a deep decline is most likely underway.
Hopefully the twilight clouds will clear tonight!
Tks and regards
Peter Williams
From: variablestarssouth(a)googlegroups.com <mailto:variablestarssouth@googlegroups.com> [mailto:variablestarssouth@googlegroups.com] On Behalf Of Marcos Silva
Sent: Saturday, 30 July 2022 8:03 AM
To: Variable Stars South <VariableStarsSouth(a)googlegroups.com <mailto:VariableStarsSouth@googlegroups.com> >
Subject: [VSS] V0854 CEN fading?
Dear VSS friends, last night i observed the RCB star V0854 Cen fainter than the comparison star of mag 7.5. I have observed it here again now and estimated the magnitude of 7.9, we have some cirrus here at the moment, so the star could be a little bit brighter (7.8 or 7.7). But it is still fainter than 7.5 and brighter than 8.2.
I'm warning you because this could be the beginning of a fading of the star.
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> This long outburst began between 2022 July 16 and 21. It was
> observed at mag. 13 for five days, followed by a rapid fading
> on July 27. The outburst was considerably longer than short
> outbursts of this dwarf nova, but shorter than standard UGSU
> superoutbursts (~14 days).
Might be an EI Psc star, although the peak M_V is not
too faint.
Variable Reticuli 2005 (UGSU:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=161100
Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) light curve and data:
https://asas-sn.osu.edu/sky-patrol/coordinate/38d59ff4-1572-40ef-a0c5-e280e…
This long outburst began between 2022 July 16 and 21. It was
observed at mag. 13 for five days, followed by a rapid fading
on July 27. The outburst was considerably longer than short
outbursts of this dwarf nova, but shorter than standard UGSU
superoutbursts (~14 days).
Regards,
Patrick
TCP J22561804+4109534 rebrightenings
Tamas Tordai has reported further observations.
Five rebrightenings have been recorded up to July 24.
The amplitudes, however, are decreasing and frequent
small-amplitude rebrightenings resemble those of WZ Sge.
This phenomenon is atypical for this orbital period.
The symbiotic star V619 Sgr is undergoing a new outburst and has now
reached a magnitude of 10.66V.
It shows a similar brightness and brightening pattern as during the last
such outburst, exactly 15 years ago.
Berto Monard / KKO