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
TCPJ23580961+5502508: new WZ Sge-type dwarf nova
Kyoto Univ. Obs. observed TCPJ23580961+5502508 on 30th Sep.
We detected early superhumps with a period of ~0.060 d, and an amplitude of
0.2 mag!
Therefore TCPJ23580961+5502508 is a new WZ Sge-type dwarf nova, and also
has one of the largest early superhump amplitude.
Follow-up photometry is strongly encouraged.
Best,Yusuke
--
----------------------------------------------
Kyoto University, Graduate School of Department of Astronomy, PhD student
Yusuke TAMPO
MAIL: tampo(a)kusastro.kyoto-u.ac.jp
----------------------------------------------
TCP J23580961+5502508
Large outburst amplitude of 8.7 mag. Possible WZ Sge-type dwarf nova.
TCP J23580961+5502508 2022 09 30.4363* 23 58 09.61 +55 02 50.8 12.0 U Cas 9 0
http://www.cbat.eps.harvard.edu/unconf/followups/J23580961+5502508.html
2022 09 30.436
Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(5_s exp) under limiting mag.= 13.5 taken by Canon EOS 6D digital camera + 135mm f/3.5 lens. Nothing is visible at this location taken on 2022 Sep29.601 UT under limiting mag.= 14.2, Mag=13.5 taken by Canon EOS 6D digital camera +200mm f3.2lens.
2022 09 30.549
Mag.= 12.0, position end figures 09s.58, 50".3 observed by T. Noguchi, Katori, Japan, using 0.23-m f/10 Schmidt-Cassegrain + unfiltered CCD (KAF-0261E), An image at http://park8.wakwak.com/~ngc/images/TCPinCas_20220930.jpg.
2022 09 30.4435
Yuji Nakamura, Kameyama, Mie, Japan, found this TCP on two frames (6 sec exp. limiting mag 13.5) taken by 135mm/F4.0 lens and CMOS camera. Mag.= 12.2, position end figures 09s.54, 49".9. Nothing is visible at this location on the frames taken on 2022 Sep. 26.4587 UT (6 sec exp. limiting mag 13.5) by same instrument. --- Isao Endoh (NAOJ)
IDs:
235809.604 +550250.329 Gaia_DR2_1993876650919517440 Plx=-1.3305(1.2667) dismod=-- pmRA=-6.965(2.818) pmDE=-26.213(1.222) G=20.6889(0.0112) BP-RP=0.5106 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=--
235809.629 +550250.684 Gaia_EDR3_1993876650919517440 Plx=2.4918(0.8465) dismod=8.0 PM=26.721 pmRA=-13.58(1.081) pmDE=-23.013(0.697) G=20.611666(0.008471) BP-RP=0.426098 E(g-r)=0.110 E(B-V)=0.097 Ag=0.387 Ar=0.288 Ai=0.217
235809.572 +550248.802 PS1_DR1_174053595400396965 g=--(--) r=--(--) i=--(--) z=20.6374(0.0806) y=--(--)
235809.610 +550250.321 PS1_DR1_174053595401147507 g=20.7349(0.0215) r=20.7017(0.0399) i=20.7022(0.0305) z=20.6861(0.0456) y=--(--)
ASAS-SN Sky Patrol:
https://asas-sn.osu.edu/sky-patrol/coordinate/2cea05a1-2534-4aae-9a9e-6cc26…
MPChecker:
NO DATA
YYYYMMDD(UT) mag code
20220926.4587 <13.5C (Yuji Nakamura)
20220927.609 20.539cy ATF
20220928.343 <17.329g ASN
20220928.344 <17.398g ASN
20220928.346 <17.327g ASN
20220929.430 19.115o ATF
20220929.434 19.325o ATF
20220929.439 19.241o ATF
20220929.601 <14.2C (Tadashi Kojima)
20220930.436 12.0C (Tadashi Kojima)
20220930.4435 12.2C (Yuji Nakamura)
20220930.549 12.0C (Toshihide Noguchi)
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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