- vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26501] MASTER OT J030227.28+191754.5: stage A superhumps, eventually
by Taichi Kato 05 Jan '22

05 Jan '22

MASTER OT J030227.28+191754.5: stage A superhumps, eventually The most recent data by Tonny Vanmunster, Tamas Tordai and Itoh-san have recorded emerging ordinary superhumps since 2021 Dec. 30 -- 32 d after the outburst detection! (The longest record, probably related to the large outburst amplitude). The period of stage A superhumps is 0.0616(2) d (2-d baseline). The period of early superhumps is 0.059851(5) d. The corresponding mass ratio is 0.076(10), which will be updated as more observations become available. This value corresponds to a "borderline" period bouncer. List of observers and numbers of measurements: Code Mode Corr SD Obs OKU B -0.401 0.051 1503 KU1 CV -0.427 0.044 19437 Van CV -0.503 0.022 512 KU1 V -0.281 0.038 8153 Ioh C -0.283 0.050 20707 Trt V -0.291 0.030 358 HaC CV -0.242 0.067 262 KU1 Ic 0.012 0.033 109 KU1 Rc -0.051 0.026 119 KU1 B -0.424 0.024 118 Kis C -0.380 0.060 1812 Vih V -0.282 0.032 242 Vih Ic -0.001 0.030 245 Trt CV -0.207 0.031 1440 RFD V -0.173 0.014 175 OKU C 12.103 0.059 1539 GCH CV -0.457 0.018 7

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[vsnet-alert 26505] TV Crv superhumps
by Taichi Kato 05 Jan '22

05 Jan '22

TV Crv superhumps Itoh-san detected superhumps.

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[vsnet-alert 26504] ASASSN-19za possible superoutburst
by Taichi Kato 03 Jan '22

03 Jan '22

ASASSN-19za possible superoutburst Gaia22aau AT2019slj 2022-01-01 15:22:10 350.07709 49.32948 15.14 18.99 0.72 CV 2022-01-03 14:16:29 ~5 mag outburst in confirmed CV ASASSN-19za, spectrum on TNS http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia22aau/ Observations on two nights during the 2019 superoutbursts.

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[vsnet-alert 26502] MASTER OT J042609.34+354144.8 bright outburst
by Denis Denisenko 03 Jan '22

03 Jan '22

This SU UMa type dwarf nova in Perseus is in outburst on the latest image from Open University's COAST telescope installed on Teide, Tenerife. COAST Mark III is 0.42-m f/6.8 CDK17 Dall-Kirkham with FLI ProLine KAF-09000 CCD. MASTER OT J042609.34+354144.8 20211122.3276 16.38r ZTF Lasair 20211212.9034 16.12CV COAST 20211213.4163 16.30o ATLAS (Tonry et al.) 20211221.5314 16.15o ATLAS 20211223.5042 15.84o ATLAS 20211225.3864 16.28o ATLAS 20211226.3844 16.50o ATLAS last observartion before outburst 20211227.9386 15.93CV COAST 20220103.0572 13.29CV COAST Outburst! ZTF Lasair real-time data https://lasair.roe.ac.uk/object/ZTF17aabuvss/ has not been updated since 2021 Nov. 22 (MJD=59540). The light curve from Zwicky Transient Facility (Masci et al., 2019) Data Release 8: http://scan.sai.msu.ru/~denis/J0426+3541-ZTF-DR8-LC.gif Light curve from ATLAS forced photometry server (Tonry et al., 2018): http://scan.sai.msu.ru/~denis/J0426+3541-ATLAS-LC.gif Note the long-term variations of the quiescent level. Fourth body in the system? Third body is apparently too far away (16.6" at 186 pc is about 3000 AU, or 100x Sun-Neptune distance) to cause perturbations on a few years time scale. Denis Denisenko

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[vsnet-alert 26500] TV Crv superoutburst (since Dec. 29)
by Patrick Schmeer 02 Jan '22

02 Jan '22

TV Corvi (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=10699 From "activity at a glance (Jan 02)" (Taichi Kato, vsnet-outburst 28168): 20211229.671 132 (Rod Stubbings) 20211230.1675 13.37C (Masao Funada) 20211230.669 134 (Rod Stubbings) 20211231.3199 13.52C (Masao Funada) The current superoutburst started between 2021 December 24 and 29 according to recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data: https://asas-sn.osu.edu/sky-patrol/coordinate/80b95890-7fe5-4e17-80aa-85d9b… Normal outbursts were observed from 2021 February 16 to 18 and from July 5 to 7. Time-resolved photometry is encouraged. Clear skies, Patrick

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[vsnet-alert 26499] EF Peg likely superoutburst (since Dec. 30)
by Patrick Schmeer 02 Jan '22

02 Jan '22

EG Pegasi (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=25272 From "activity at a glance (Jan 02)" (Taichi Kato, vsnet-outburst 28168): 20211220.412 <130 (Tsuneo Horie) 20211221.415 <130 (Tsuneo Horie) 20211222.4465 <158c (Yutaka Maeda) 20211223.4439 <151c (Yutaka Maeda) 20211226.410 <130 (Tsuneo Horie) 20211227.417 <130 (Tsuneo Horie) 20211228.372 <130 (Tsuneo Horie) 20211230.410 116 (Tsuneo Horie) 20211231.406 112 (Tsuneo Horie) 20211231.4368 113cG (Yutaka Maeda) 20220101.4006 11.40C (Masayuki Moriyama) Recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data (contaminated): https://asas-sn.osu.edu/sky-patrol/coordinate/7d4a7099-69dc-44f3-b85d-0f4e9… Time-resolved photometry is encouraged (note: 12.6 mag. companion 5" to the SE). Clear skies, Patrick

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[vsnet-alert 26498] CRTS J045446.8-181214 (super?)outburst (since Dec. 29)
by Patrick Schmeer 02 Jan '22

02 Jan '22

CRTS J045446.8-181214 (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=298372 Grzegorz Duszanowicz reports that SSS 130317:045447-181214 is bright (mag. 14.6). According to ASAS-SN Sky Patrol data the outburst started on 2021 December 28 or 29: https://asas-sn.osu.edu/sky-patrol/coordinate/a51092ff-2b3c-45d0-8d88-09d64… ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF18achtaah/ Time-resolved photometry 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 Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M

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[vsnet-alert 26497] 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-alert 26495] 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-alert 26492] 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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