November 2023 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27969] SDSS J080249.06+363716.4 = ASASSN-23ic: new SU UMa-type dwarf nova
by Taichi Kato 27 Nov '23

27 Nov '23

SDSS J080249.06+363716.4 = ASASSN-23ic: new SU UMa-type dwarf nova Itoh-san reported observations. Although the object is currently faint (17 mag), superhumps and possible shallow eclipses were seen. The period is 0.05919(2) d. This period expresses superhumps well. Due to the limited coverage, possible eclipses fell at the same superhump phase and the orbital and superhump periods were not distinguished.

1 0

[vsnet-alert 27968] TCP J04251906+2841462: new WZ Sge-type dwarf nova
by Taichi Kato 22 Nov '23

22 Nov '23

TCP J04251906+2841462: new WZ Sge-type dwarf nova Kiyota-san reported observations. Early superhumps with a period of 0.0539(4) d and an amplitude of 0.07 mag were present.

1 0

[vsnet-alert 27967] TT Ari brightenning
by Pavol A. Dubovsky 18 Nov '23

18 Nov '23

I recorded TT Ari significantly brighter recently. Following are my visual observations: ARITT 20231115.060 10.80 DPV ARITT 20231116.928 10.76 DPV ARITT 20231118.128 10.41 DPV ACTIVE ARITT 20231118.135 10.37 DPV ACTIVE ARITT 20231118.159 10.32 DPV ACTIVE -- Pavol A. Dubovsky Ponta do Sol, Madeira, Portugal var.kozmos.sk

1 0

[vsnet-alert 27966] TCP J23030178+4916384: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 16 Nov '23

16 Nov '23

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J23030178+4916384 (aka AT 2023xni) obtained on 2023, Nov 14/15 and Nov 15/16 at CBA Extremadura Observatory using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. My observations were triggered by this report in TNS: https://www.wis-tns.org/object/2023xni While no clear periodic signal is present in the Nov 14/15 observations, the object clearly started showing superhumps in the light curve of Nov 15/16. The superhumps have an amplitude of 0.21 mag, establishing TCP J23030178+4916384 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 superhump period of 0.0662 +/- 0.0007 d. The object was at mag CV = 17.5 on Nov 16th. Another observing session of this object is currently ongoing at CBA Extremadura Observatory. Image calibration and photometry were done using a beta version of Phoranso. 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.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 *** NEW - COMING SOON *** http://www.phoranso.com <http://www.phoranso.com/>

1 0

[vsnet-alert 27965] TCP J19582065+5506531: new SU UMa-type dwarf nova
by Taichi Kato 16 Nov '23

16 Nov '23

TCP J19582065+5506531: new SU UMa-type dwarf nova The most recent observations by Itoh-san (Nov. 15) showed clear superhumps (period about 0.059 d). They were developing on Nov. 14.

1 0

[vsnet-alert 27964] TCP J20315286+2740166: ordinary superhumps
by Taichi Kato 16 Nov '23

16 Nov '23

TCP J20315286+2740166: ordinary superhumps Osaka Kyoiku U team, Kyoto U team, Itoh-san, Kiyota-san, Stephen Brincat and Tamas Tordai have reported observations. Ordinary superhumps started to appear on Nov. 12 and the current superhump period is 0.05694(7) d. The small amplitude 0.035 mag and the profile suggest that they are still in stage A.

1 0

[vsnet-alert 27963] TCP J20315286+2740166: likely early superhumps
by Taichi Kato 06 Nov '23

06 Nov '23

TCP J20315286+2740166: likely early superhumps Osaka Kyoiku U team, Itoh-san and Stephen Brincat have reported observations. There are likely early superhumps with a period of 0.0552(2) d and an amplitude of 0.035 mag. The baseline is still short and the result is preliminary.

1 0

[vsnet-alert 27962] TCP J18433189+1011051: new SU UMa star
by Taichi Kato 04 Nov '23

04 Nov '23

TCP J18433189+1011051: new SU UMa star According to Itoh-san's observations on Nov. 3, this object showed superhumps with a period of about 0.065 d.

1 0

[vsnet-alert 27961] PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: SU UMa star
by Taichi Kato 04 Nov '23

04 Nov '23

PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: SU UMa star According to Itoh-san's observations on Nov. 3, this object showed superhumps with an amplitude of 0.17 mag. The period of 0.0597(4) d excludes the possibility of an AM CVn star as I suggested earlier. The period was close to the half of this superhump period and the variations may have been early superhumps, though two maxima were almost equal. The nature will be clarified when a better measurement of the superhump period is obtained.

1 0

[vsnet-alert 27960] PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: superoutburst from a most likely AM CVn star
by Taichi Kato 02 Nov '23

02 Nov '23

PS1-3PI J063334.87-230546.4 = Gaia DR3 2924954955730613376 = TCP J06333486-2305449: superoutburst from a most likely AM CVn star Kiyota-san, Itoh-san and Josch Hambsch have reported observations. The data show superhumps with a period of 0.02942(2) d. Amplitude 0.043 mag. The low amplitude seems to suggest a low mass ratio, consistent with an AM CVn star. The data are still somewhat insufficient and more observations are needed.

1 0

2024

2023

2022

2021

vsnet-alert November 2023