February 2023 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16906] ASASSN-17qh likely superoutburst
by Taichi Kato 04 Feb '23

04 Feb '23

ASASSN-17qh likely superoutburst (Known SU UMa star) Funada-san detected an outburst at 13.4 on Feb. 3.

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[vsnet-campaign-dn 16905] IY UMa faint? superoutburst
by Taichi Kato 02 Feb '23

02 Feb '23

IY UMa faint? superoutburst Kiyota-san detected superhumps and eclipses. YYYYMMDD(UT) mag observer 20230127.842 <133 (Tsuneo Horie) 20230128.828 <136 (Tsuneo Horie) 20230129.844 <136 (Tsuneo Horie) 20230130.6751 140cG (Yutaka Maeda) 20230130.6751 140cG (Yutaka Maeda) 20230130.826 <136 (Tsuneo Horie) 20230130.9771 144 (Eddy Muyllaert)

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[vsnet-campaign-dn 16904] PNVJ06245297+0208207: fading from superoutburst plateau
by Taichi Kato 02 Feb '23

02 Feb '23

PNVJ06245297+0208207: fading from superoutburst plateau The object started fading rather rapidly on Jan. 31 (Itoh-san, Kiyota-san and Kyoto U. team). The object reached about 15.5 mag on Feb. 1 (Itoh-san). The superhump period during the superoutburst plateau (up to Jan. 30) was 0.033372(5) d. Observers were Kyoto U. team, Itoh-san, Kiyota-san, Crimean Astrophys. Obs. team and Josch Hambsch). This may be shorter than the orbital period (see Kato 2022 arXiv:2201.02945). The evolution of the outburst in this system is very similar to SDSS J090221.35+381941.9 and it would brighten again to a plateau phase. Have a look at the paper. https://ui.adsabs.harvard.edu/abs/2014PASJ...66L...7K/abstract Continued observations are requested.

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[vsnet-campaign-dn 16903] CRTS J141712.0-180328: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 02 Feb '23

02 Feb '23

Dear colleagues, I have just finished analysing my unfiltered CCD observations of CRTS J141712.0-180328 (aka CSS 080425:141712-180328) obtained on 2023, Jan 31/Feb 01 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 0.17 mag, establishing CRTS J141712.0-180328 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 0.0853 +/- 0.0038d. The object was at mag CV = 14.6 on Jan 31st. 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> http://www.cbabelgium.com PERANSO: The Light Curve and Period Analysis Software http://www.peranso.com

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[vsnet-campaign-dn 16902] CRTS J141712.0-180328 indeed most likely superoutburst
by Taichi Kato 01 Feb '23

01 Feb '23

CRTS J141712.0-180328 indeed most likely superoutburst Outburst still young enough. ATLAS data suggest supercycle of 1.5 yr. YYYYMMDD(UT) mag observer 20230120.7877 <147c (Yutaka Maeda) 20230121.7760 <144c (Yutaka Maeda) 20230129.3037 16.065o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3068 16.024o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3104 15.990o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3198 15.893o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3825 15.298o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3467 14.487o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3569 14.490o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3722 14.531o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3786 14.534o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.7778 142c (Yutaka Maeda) 20230130.7778 142c (Yutaka Maeda) 20230131.0745 14.376c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230131.0782 14.359c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230131.1000 14.356c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230131.1106 14.378c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-campaign-dn 16901] GP CVn superoutburst (UGSU+E)
by Taichi Kato 01 Feb '23

01 Feb '23

GP CVn superoutburst (UGSU+E) YYYYMMDD(UT) mag observer 20230107.8480 <149c (Yutaka Maeda) 20230107.9094 <145C (Masayuki Moriyama) 20230108.7692 <145c (Yutaka Maeda) 20230109.8181 <147c (Yutaka Maeda) 20230110.7889 <151c (Yutaka Maeda) 20230113.2503 <184C (Masao Funada) 20230120.7712 155c (Yutaka Maeda) 20230121.7598 152c (Yutaka Maeda) 20230130.7078 153c (Yutaka Maeda)

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[vsnet-campaign-dn 16900] CRTS J141712.0-180328 relatively rare outburst
by Taichi Kato 01 Feb '23

01 Feb '23

CRTS J141712.0-180328 relatively rare outburst Likely superoutburst (Porb=0.0845 d) YYYYMMDD(UT) mag observer 20221231.8038 <141c (Yutaka Maeda) 20230103.7945 <142c (Yutaka Maeda) 20230110.8040 <142c (Yutaka Maeda) 20230120.7877 <147c (Yutaka Maeda) 20230121.7760 <144c (Yutaka Maeda) 20230130.7778 142c (Yutaka Maeda) 20230130.7778 142c (Yutaka Maeda)

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[vsnet-campaign-dn 16899] V803 Cen likely superoutburst
by Taichi Kato 01 Feb '23

01 Feb '23

V803 Cen likely superoutburst YYYYMMDD(UT) mag observer 20230120.569 153 (Rod Stubbings) 20230120.8962 <150C (Masayuki Moriyama) 20230122.567 <156 (Rod Stubbings) 20230131.606 126 (Rod Stubbings)

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