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

[vsnet-campaign-dn 17010] ASASSN-16de superoutburst?
by Taichi Kato 04 Mar '23

04 Mar '23

ASASSN-16de superoutburst? (Known SU UMa star) YYYYMMDD(UT) mag observer 20230214.8655 <149c (Yutaka Maeda) 20230215.8701 <153c (Yutaka Maeda) 20230221.8241 <152c (Yutaka Maeda) 20230225.8272 158:c (Yutaka Maeda) 20230226.7798 <148c (Yutaka Maeda) 20230227.7792 <140c (Yutaka Maeda) 20230302.8260 <151c (Yutaka Maeda) 20230302.8287 167C (Masayuki Moriyama)

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[vsnet-campaign-dn 17009] ASASSN-15le superoutburst?
by Taichi Kato 04 Mar '23

04 Mar '23

ASASSN-15le superoutburst? (Known SU UMa star) YYYYMMDD(UT) mag observer 20230221.8236 <160c (Yutaka Maeda) 20230225.8267 <161c (Yutaka Maeda) 20230226.7793 145:cG (Yutaka Maeda) 20230227.7787 <147c (Yutaka Maeda) 20230302.8255 <154c (Yutaka Maeda) 20230302.8645 149C (Masayuki Moriyama)

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[vsnet-campaign-dn 17008] V589 Her possible superoutburst
by Taichi Kato 04 Mar '23

04 Mar '23

V589 Her possible superoutburst YYYYMMDD(UT) mag observer 20230225.7745 <154c (Yutaka Maeda) 20230226.7276 <160c (Yutaka Maeda) 20230227.7272 <156c (Yutaka Maeda) 20230302.7736 148:c (Yutaka Maeda) 20230302.8352 151C (Masayuki Moriyama)

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[vsnet-campaign-dn 17007] MASTER OT J055845.55+391533.4: rapid decay of superhumps
by Taichi Kato 04 Mar '23

04 Mar '23

MASTER OT J055845.55+391533.4: rapid decay of superhumps Superhumps in this object rapidly decayed (compared to ordinary SU UMa stars, but similar to AM CVn stars). The object may have already started fading rapidly and further continued observations are requested to know the nature of the (expected) second outburst. Observers: Tonny Vanmunster, Kiyota-san and Kubodera-san.

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[vsnet-campaign-dn 17006] ASASSN-23ax: oscillation-type rebrightenings (WZ Sge)
by Taichi Kato 04 Mar '23

04 Mar '23

ASASSN-23ax: oscillation-type rebrightenings (WZ Sge) Josch Hambsch has reported observations. The object now shows oscillation-type rebrightenings as in WZ Sge.

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[vsnet-campaign-dn 17005] CRTSJ085024.2-235811: neglected AM CVn, on the fading tail of the 2022 superoutburst
by Taichi Kato 02 Mar '23

02 Mar '23

CRTSJ085024.2-235811: neglected AM CVn, on the fading tail of the 2022 superoutburst Numerous rebrightenings and long fading tail. Supercycle about 1 yr and observations during the next superoutburst is wanted. Currently mag 19. YYYYMMDD(UT) mag observer 20221017.3308 15.293o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221017.3331 15.286o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221017.3383 15.222o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221017.3456 15.238o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-campaign-dn 16996] ASASSN-15ny
by Taichi Kato 02 Mar '23

02 Mar '23

ASASSN-15ny True? YYYYMMDD(UT) mag observer 20230227.8624 132:c (Yutaka Maeda)

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[vsnet-campaign-dn 17003] CRTSJ210356.7-214727: overlooked superoutburst in 2022 Dec.
by Taichi Kato 02 Mar '23

02 Mar '23

CRTSJ210356.7-214727: overlooked superoutburst in 2022 Dec. The object reached 14.3 (2020 Nov.) and regular monitoring is recommended. YYYYMMDD(UT) mag observer 20221119.8114 19.368c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221127.7782 15.772c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221127.7824 15.758c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221127.7879 15.763c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221127.7994 15.724c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.0242 15.365o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.0273 15.366o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.0346 15.343o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221130.0450 15.354o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221202.8016 17.456o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221202.8067 17.441o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221202.8099 17.342o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221202.8200 17.329o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.0291 15.113o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.0296 15.073o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.0332 15.041o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.0337 15.057o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.0400 15.055o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.0409 15.015o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221208.0527 15.078o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.0342 15.665o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.0346 15.390o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.0392 15.408o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.0396 15.437o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.0501 15.430o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.0570 15.397o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.7809 15.546o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.7841 15.483o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20221213.7941 15.455o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-campaign-dn 17002] DDE 139: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 01 Mar '23

01 Mar '23

Dear colleagues I have just finished analysing my unfiltered CCD observations of DDE 139 obtained on 2023, Feb 27/28 and Feb 28/Mar 01 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under relatively clear skies. The resulting light curve shows the presence of regular superhumps with an amplitude of 0.38 mag, establishing DDE 139 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 0.0798 +/- 0.0004d. The object was at mag CV = 16.9 on Mar 01st. 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 17001] CRTSJ173801.9+354549: most likely AM CVn
by Taichi Kato 01 Mar '23

01 Mar '23

CRTSJ173801.9+354549: most likely AM CVn Using ATLAS forced photometry (Tonry et al. 2018; Shingles et al. 2021). Short superoutburst + multiple rebrightenings + fading tail. Supercycle about 250 d.

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