October 2021 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16067] CRTS J043112.4-031452 outburst
by Taichi Kato 24 Oct '21

24 Oct '21

CRTS J043112.4-031452 outburst Eclipsing SU UMa star. YYYYMMDD(UT) mag observer 20210918.3238 <166C (Masao Funada) 20211009.2245 178cG (Masao Funada) 20211022.3397 15.806zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211022.3946 15.685zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-campaign-dn 16066] CRTS J172929.1+201808 possible superoutburst
by Taichi Kato 24 Oct '21

24 Oct '21

CRTS J172929.1+201808 possible superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20211023.1556 16.970zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-campaign-dn 16065] ASASSN-19ty likely superoutburst
by Taichi Kato 24 Oct '21

24 Oct '21

ASASSN-19ty likely superoutburst Type from ZTF data. Time-resolved observations are encouraged. YYYYMMDD(UT) mag observer 20211023.1927 15.353zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-campaign-dn 16064] ASASSN-21tr
by Taichi Kato 21 Oct '21

21 Oct '21

ASASSN-21tr Large outburst amplitude. ASASSN-21tr --- ------- 7:53:30.48 66:29:23.7 2021-10-21.36 14.56 SDSS DSS VIZIER ------- CV candidate, matches to SDSS g=22.2, g>17.3 on 2021-10-19.49, g=14.9 on 2021-10-21.36 ASASSN-21tr 20211019.49 <173g ASN ASASSN-21tr 20211021.36 149g ASN

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[vsnet-campaign-dn 16063] 1RXS J063214.8+253620
by Taichi Kato 21 Oct '21

21 Oct '21

1RXS J063214.8+253620 This object is a long-period SS Cyg star and does not require special time-resolved photometry. Using ZTF data, I obtained an orbital period of 0.324254(3) d (in agreement with Armstrong et al. 2016 using K2 data). The profile is double wave (ellipsoidal variation) + orbital hump, as expected for a low-Mdot SS Cyg star.

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[vsnet-campaign-dn 16062] MASTER OT J211656.91-432501.4: new SU UMa-type dwarf nova
by Taichi Kato 21 Oct '21

21 Oct '21

MASTER OT J211656.91-432501.4: new SU UMa-type dwarf nova Berto Monard reported observations. On Oct. 10, the object showed 0.3-mag superhumps. The period was about 0.06 d.

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[vsnet-campaign-dn 16061] Gaia19cws most likely superoutburst
by Taichi Kato 21 Oct '21

21 Oct '21

Gaia19cws most likely superoutburst Most likely SU UMa star with a short supercycle 140 d (from ZTF data). YYYYMMDD(UT) mag observer 20210927.3499 19.481zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210927.3924 20.037zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.2996 19.794zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.3377 19.572zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211010.3902 17.149zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211014.4368 17.500zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-campaign-dn 16060] XM78HT: period of early superhumps
by Taichi Kato 21 Oct '21

21 Oct '21

XM78HT: period of early superhumps Tonny Vanmunster and Itoh-san have reported observations. The amplitudes of early superhumps have decreased. The mean period up to now is 0.05413(6) d.

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[vsnet-campaign-dn 16059] ASASSN-21tg: superhump period
by Taichi Kato 19 Oct '21

19 Oct '21

ASASSN-21tg: superhump period Josch Hambsch has reported further observations. The amplitude of superhumps has grown (now more than 0.3 mag). The current superhump period is 0.0939(1) d (stage A).

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[vsnet-campaign-dn 16058] ASASSN-21tg: new SU UMa-type dwarf nova
by Taichi Kato 18 Oct '21

18 Oct '21

ASASSN-21tg: new SU UMa-type dwarf nova Josch Hambsch has reported further observations. The object showed superhumps on Oct. 17. The period is not well determined, but is close to 0.1 d. The current amplitude is 0.2 mag. The object is not an AM CVn star as initially suggested from the decline rate of the precursor. The very rapid deline for this orbital period is exceptional. Further observations are needed.

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