January 2022 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16182] V485 Cen superoutburst

by Taichi Kato

V485 Cen superoutburst EI Psc-type object. YYYYMMDD(UT) mag observer 20211218.2709 <168C (Masao Funada) 20211225.3367 14.18C (Masao Funada) 20211227.642 144 (Rod Stubbings) 20211228.658 145 (Rod Stubbings) 20211229.658 145 (Rod Stubbings)

11 months, 3 weeks

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[vsnet-campaign-dn 16220] Re: ASASSN-20pv: no major variations yet

by Taichi Kato

> Observations on Jan 20 showed a transition to the early modulation with > 'growing' superhumps of still small amplitude and a hint of a 0.0095d alt. > 0.019d period around a mean magnitude of 12.49CR. Ordinary superhumps, yes. The amplitudes were too small to be directly visible in Hambsch's data.

1 year, 3 months

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[vsnet-campaign-dn 16208] TCP J07094936+1412280: appearance of ordinary superhumps

by 反保雄介

TCP J07094936+1412280: appearance of ordinary superhumps Kiyota-san, Itoh-san, Tonny Vanmunster, Stephen M. Brincat, Sano-san, Tamás Tordai, and Kyoto Univ. Obs. have reported further observations of TCP J07094936+1412280. The data on 15th Jan at Kyoto Univ. Obs. showed clear ordinary superhumps with an amplitude of ~0.15 mag. The baseline was still too short to determine its period. Continuous observations are encouraged. Best, Yusuke

1 year, 3 months

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[vsnet-campaign-dn 16222] ASASSN-22ax: new SU UMa-type dwarf nova

by Taichi Kato

ASASSN-22ax: new SU UMa-type dwarf nova Stephen Brincat, Itoh-san and Kiyota-san have reported observations. Since Jan. 26, this object has shown superhumpss with a period of 0.06114(7) d and an amplitude of 0.22 mag. Superhumps were not apparent up to Jan. 24.

1 year, 3 months

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[vsnet-campaign-dn 16221] ASASSN-22as: new SU UMa-type dwarf nova

by tonny.vanmunster＠gmail.com

Dear colleagues, I have been collecting unfiltered CCD observations of ASASSN-22as over the past 11 nights at CBA Extremadura Observatory, using a 0.40-m f/5.1 telescope and SX-46 CCD camera under mostly clear skies. The collected light curves did not show obvious periodic modulations, with the exception of last night Jan 27/28, 2022. Regular superhumps with an amplitude of 0.24 mag are finally visible, establishing ASASSN-22as 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 0.0651 +/- 0.0007d. The object was at mag CV = 16.4 on Jan 28th. 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

1 year, 3 months

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[vsnet-campaign-dn 16219] ASASSN-20pv: no major variations yet

by Taichi Kato

ASASSN-20pv: no major variations yet Josch Hambsch reported observations on two nights. No major variations were found. The object may be currently in early superhump phase.

1 year, 4 months

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[vsnet-campaign-dn 16218] ASASSN-22as: new SU UMa (or even WZ Sge?) star in the period gap

by Taichi Kato

ASASSN-22as: new SU UMa (or even WZ Sge?) star in the period gap Tonny Vanmunster and Tamas Tordai have reported observations. I could find a period of 0.09974(9) d (full amplitude of 0.10 mag). The profile resembles that of early superhumps (doubly peaked, sharp minimum) rather than ordinary superhumps. It is also possible that these superhumps are stage A superhumps. If this is indeed a WZ Sge star, it is very unusual. Further observations are needed to follow the development of these superhumps.

1 year, 4 months

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[vsnet-campaign-dn 16217] ASASSN-22aw: superhump period

by Taichi Kato

ASASSN-22aw: superhump period Tamas Tordai and Itoh-san have reported observations. The superhump period is 0.07196(9) d.

1 year, 4 months

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[vsnet-campaign-dn 16216] ASASSN-22aw: most likely SU UMa star

by Taichi Kato

ASASSN-22aw: most likely SU UMa star Tamas Tordai has reported observations. There was a 0.4 mag hump (likely superhump). More observations are needed to determine the period.

1 year, 4 months

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[vsnet-campaign-dn 16215] ASASSN-22ax

by Taichi Kato

ASASSN-22ax Bright CV detected early. ASASSN-22ax --- ------- 2:53:21.49 -13:34:9.3 2022-01-20.18 13.44 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.5, g>17.2 on 2022-01-18.27, g=15.9 on 2022-01-19.22, g=13.6 on 2022-01-20.12 ASASSN-22ax 20220118.27 <172g ASN ASASSN-22ax 20220119.22 159g ASN ASASSN-22ax 20220120.12 136g ASN 025321.486 -133408.83 (2000.0) Gaia_DR2_5157734725783900032 plx=-(-) dismod=- pmra=-(-) pmdec=-(-) G=20.639 BP=20.719 RP=20.478 025321.486 -133408.83 (2000.0) Gaia_EDR3_5157734725783900032 plx=-0.681(1.731) dismod=- pmra=-10.028(1.037) pmdec=-18.710(1.362) G=20.572 BP=20.396 RP=20.680 025321.479 -133408.51 (2000.0) GALEX_DR5_2920234851152954444 NUV=20.984(0.066) FUV=21.024(0.092)

1 year, 4 months

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