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[vsnet-campaign-dn 16051] TCP J01535830+5937545: likely superoutburst of an SU UMa star
by Taichi Kato 15 Oct '21

15 Oct '21

TCP J01535830+5937545: likely superoutburst of an SU UMa star Type from ZTF data. Apparent superoutburst in 2019 Nov. YYYYMMDD(UT) mag observer 20211010.6888 170:C (Masayuki Moriyama) 20211011.8173 163:C (Masayuki Moriyama)

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[vsnet-campaign-dn 16050] Re: PNV J00444033+4113068: updated period of early superhumps
by Taichi Kato 15 Oct '21

15 Oct '21

Re: PNV J00444033+4113068: updated period of early superhumps > Tamas Tordai and Tonny Vanmunster have reported new > observations. Sano-san also reported observations. The result is unchanged.

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[vsnet-campaign-dn 16049] PNV J00444033+4113068: updated period of early superhumps
by Taichi Kato 15 Oct '21

15 Oct '21

PNV J00444033+4113068: updated period of early superhumps Tamas Tordai and Tonny Vanmunster have reported new observations. The best period using these observations is 0.05543(2) d. The double wave profile is very apparent. The deeper minima appear to be partially caused by eclipses. These eclipses will become more apparent when ordinary superhumps appear.

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[vsnet-campaign-dn 16048] ASASSN-21sz: new SU UMa-type dwarf nova
by Taichi Kato 15 Oct '21

15 Oct '21

ASASSN-21sz: new SU UMa-type dwarf nova Josch Hambsch has reported observations. The data showed 0.20 mag superhumps with a period of 0.065(2) d.

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[vsnet-campaign-dn 16047] Re: ASASSN-14cc
by Patrick Schmeer 14 Oct '21

14 Oct '21

ASASSN-14cc (AM CVn star) https://www.aavso.org/vsx/index.php?view=detail.top&oid=398940 Apparently not much activity in recent months: after a normal outburst on 2021 May 23, the only recorded brightening was a double outburst on August 4-10 and 13-18, according to ASAS-SN Sky Patrol (Shappee et al. … [View More]2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data. https://asas-sn.osu.edu/sky-patrol/coordinate/d031a323-285e-44df-9854-81a0e… Regards, Patrick ------- Taichi Kato wrote on Wednesday, 28 January 2015, 07:40:45 UTC: ASASSN-14cc Let's continue observations in the next season, too. http://arxiv.org/abs/1501.06659 Title: ASASSN-14cc: Likely Helium Analog of RZ Leonis Minoris Authors: Taichi Kato (Kyoto U), Franz-Josef Hambsch (GEOS, BAV, Vereniging Voor Sterrenkunde), Berto Monard (Center for Backyard Astronomy Kleinkaroo) Categories: astro-ph.SR Comments: 5 pages, 5 figures, accepted for publication in PASJ (Letters) License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/ \\ We identified that ASASSN-14cc is a very active dwarf nova spending approximately 60% of the time in outburst. Our long-term photometry revealed that the object shows long outbursts recurring with a period of 21-33 d and very brief short outbursts lasting less than 1 d. The maximum decline rate exceeds 2.8 mag/d. The duration of long outbursts is 9-18 d, comprising 50-60% of the recurrence time of long outbursts. We detected 0.01560-0.01562 d (22.5 min) modulations during long outbursts, which we identified to be superhumps. These features indicate that ASASSN-14cc has outburst parameters very similar to the extreme dwarf nova RZ LMi but with a much shorter superhump period. All the observations can be naturally understood considering that this object is a helium analog (AM CVn-type object) of RZ LMi. The highest outburst activity among AM CVn-type objects can be understood as the high-mass transfer rate expected for the orbital period giving a condition close to the stability limit of the accretion disk. In contrast to RZ LMi, this object shows little evidence for premature quenching of the superoutburst, which has been proposed to explain the unusual outburst parameters in RZ LMi. [View Less]

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[vsnet-campaign-dn 16046] MGAB-V233 superoutburst
by Taichi Kato 13 Oct '21

13 Oct '21

MGAB-V233 superoutburst SU UMa star with a short supercycle. YYYYMMDD(UT) mag observer 20210819.7185 164C (Masayuki Moriyama) 20210928.6116 152C (Masayuki Moriyama) 20211001.7142 153C (Masayuki Moriyama) 20211007.6637 154C (Masayuki Moriyama) 20211010.6187 153C (Masayuki Moriyama)

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[vsnet-campaign-dn 16045] CRTS J014709.7+171520 superoutburst
by Taichi Kato 13 Oct '21

13 Oct '21

CRTS J014709.7+171520 superoutburst YYYYMMDD(UT) mag observer 20211003.7630 <161c (Yutaka Maeda) 20211004.7184 <163c (Yutaka Maeda) 20211005.7076 <167c (Yutaka Maeda) 20211006.7022 <164c (Yutaka Maeda) 20211007.7002 149cG (Yutaka Maeda) 20211008.842 15.24C (Gary Poyner) 20211008.8440 14.77C (Masao Funada) 20211009.3620 15.096zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211009.8576 15.31C (Masao Funada) 20211010.6022 150cG (Yutaka Maeda) … [View More]

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[vsnet-campaign-dn 16044] PNV J00444033+4113068: new WZ Sge-type dwarf nova
by Taichi Kato 13 Oct '21

13 Oct '21

PNV J00444033+4113068: new WZ Sge-type dwarf nova Tamas Tordai has reported observations. The object showed large-amplitude (0.7 mag!) early superhumps with a period of 0.0553(4) d. This object must have a high inclination and further observations are very encouraged.

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[vsnet-campaign-dn 16043] ASASSN-21sz
by Taichi Kato 12 Oct '21

12 Oct '21

ASASSN-21sz ASASSN-21sz --- ------- 21:48:30.31 -35:38:49.3 2021-10-7.14 13.56 SDSS DSS VIZIER ------- CV candidate, matches to GAIA DR2 G=18.6, g>17.8 on 2021-10-05.08, g=14.0 on 2021-10-06.11, g=14.1 on 2021-10-07.17, g=14.6 on 2021-10-10.05 ASASSN-21sz 20211005.08 <178g ASN ASASSN-21sz 20211007.17 141g ASN ASASSN-21sz 20211010.05 146g ASN 214830.443 -353848.98 (2000.0) Gaia_DR2_6587981306620492672 plx=2.019(0.320) dismod=8.5 pmra=29.370(0.384) pmdec=-19.011(0.399) G=18.… [View More]

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[vsnet-campaign-dn 16042] Re: LL And rapid fading
by Patrick Schmeer 11 Oct '21

11 Oct '21

LL Andromedae (UGWZ) https://www.aavso.org/vsx/index.php?view=detail.top&oid=260 The rapid fading was already reported by me on Sept. 9 (vsnet-alert 26311). It started around 2021 September 9.1 UT according to AAVSO data: https://app.aavso.org/webobs/results/?star=000-BBB-961 Time-resolved photometry or at least daily snapshots … [View More]

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