December 2021 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9020] TCP J07094936+1412280: new WZ Sge-type dwarf nova
by Taichi Kato 30 Dec '21

30 Dec '21

TCP J07094936+1412280: new WZ Sge-type dwarf nova Kiyota-san, Itoh-san and Tonny Vanmunster have reported observations. Kiyota-san's data very clearly showed early superhumps. The period from the combined data is 0.0548(2) d (full amplitude 0.03 mag).

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[vsnet-newvar 9019] ASASSN-21wd superhump period
by Taichi Kato 29 Dec '21

29 Dec '21

ASASSN-21wd superhump period Itoh-san has reported further observations. The superhump period has been established to be 0.06111(8) d.

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[vsnet-newvar 9018] TCP J07094936+1412280
by Naoto Kojiguchi 29 Dec '21

29 Dec '21

TCP J07094936+1412280 Large outburst amplitude of 7.7 mag. Possible WZ Sge-type object. TCP J07094936+1412280 2021 12 28.5321* 07 09 49.36 +14 12 28.0 13.6 U Gem 9 0 http://www.cbat.eps.harvard.edu/unconf/followups/J07094936+1412280.html 2021 12 28.532 Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(5_s exp) under limiting mag.= 14.2 taken by Canon EOS 6D + 200mm f/3.2 lens. Nothing is visible at this location taken on 2021 Dec14.741 UT under limiting mag.= 14.0. Mag=13.5 on 2021 Dec28.610UT with same instrument. IDs: 070949.193 +141228.431 PS1_DR1_125051074549830046 g=21.3413(0.0423) r=21.2994(0.0307) i=21.428(0.0537) z=21.1752(0.1489) y=--(--) 070949.190 +141228.548 SDSSJ070949.18+141228.5 ObsDate=2006.9006 u=21.577(21.577) g=21.345(0.043) r=21.356(0.068) i=21.459(0.123) z=21.304(0.312) ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/af22d8bb-81c3-44e8-b855-9d97e… TCPJ07094936+1412280 20211228.095 <16.967g ASN TCPJ07094936+1412280 20211228.5321 13.6C (Tadashi Kojima)

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[vsnet-newvar 9017] ASASSN-19ct: AM CVn star superoutburst
by Taichi Kato 27 Dec '21

27 Dec '21

ASASSN-19ct: AM CVn star superoutburst YYYYMMDD(UT) mag observer 20211215.617 136 (Rod Stubbings) 20211227.594 148 (Rod Stubbings)

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[vsnet-newvar 9016] ASASSN-21wd: SU UMa-type dwarf nova
by Taichi Kato 21 Dec '21

21 Dec '21

ASASSN-21wd: SU UMa-type dwarf nova Tamas Tordai also reported observations. The superhumps period is 0.05906(3) d or 0.06025(4) d, still allowing other aliases.

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[vsnet-newvar 9015] ZTF19abrqett: IW And-like phenomenon
by Taichi Kato 21 Dec '21

21 Dec '21

ZTF19abrqett: IW And-like phenomenon There was only one short fading in the ZTF data in 2020 July. The object brightened before and after this event and it is most likely a disk-instability phenomenon similar to an IW And-type dip, not VY Scl phenomenon.

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[vsnet-newvar 9014] ZTF19acqxtql: outbursts from an intermediate polar?
by Taichi Kato 21 Dec '21

21 Dec '21

ZTF19acqxtql: outbursts from an intermediate polar? ZTF data show two outbursts in 2019 Nov. They were only 8 d apart and no other outbursts were detected. The fading rates were very rapid (2 mag/d) and they look like IP outbursts.

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[vsnet-newvar 9013] ASASSN-21wd: likely SU UMa-type dwarf nova
by Taichi Kato 19 Dec '21

19 Dec '21

ASASSN-21wd: likely SU UMa-type dwarf nova Stephen M. Brincat reported observations for two hours. A hump (0.2 mag) was recorded. This object is likely an SU UMa star and further observations are encouraged.

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[vsnet-newvar 9012] SDSS J094325.90+520128.8: new SU UMa-type dwarf nova
by Taichi Kato 18 Dec '21

18 Dec '21

SDSS J094325.90+520128.8: new SU UMa-type dwarf nova Itoh-san has reported observations on five nights. The object shows 0.19-mag superhumps with a period of 0.06765(1) d.

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[vsnet-newvar 9011] DDE 35 superoutburst (since Nov. 24)
by Patrick Schmeer 16 Dec '21

16 Dec '21

DDE 35 (UGSU) Superhump period 0.116 d (above the orbital period gap) https://www.aavso.org/vsx/index.php?view=detail.top&oid=409433 During our ongoing CV monitoring program Patrick Wiggins noticed an outburst of DDE 35 on a CCD image taken on 2021 December 14. According to ATLAS and ASAS-SN Sky Patrol data DDE 35 was already bright on November 24. A precursor outburst was possibly recorded by ATLAS on November 16. https://asas-sn.osu.edu/sky-patrol/coordinate/b75b5ff0-ad77-4e83-b220-5dbbb… https://asas-sn.osu.edu/sky-patrol/coordinate/5c01e639-08a3-4781-ba77-cc5e8… ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF18accnpno/ Gaia Photometric Science Alerts data: http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia16aoy/ Time-resolved photometry during the current outburst is encouraged. Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Asteroid Terrestrial-impact Last Alert System (ATLAS): - Tonry et al., 2018PASP..130f4505T Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M

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