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

[vsnet-alert 27887] V2276 Sgr outburst (AM CVn?)
by Taichi Kato 10 Jul '23

10 Jul '23

V2276 Sgr outburst (AM CVn?) Combined ATLAS+ASAS-SN(ver2) data indicate that this object is clearly a dwarf nova. The 2022 Sep. and 2021 Aug. outbursts showed a dip and rebrightening resembling an AM CVn star. Supercycle is 80-100 d. The object may be similar to MASTER OT J055845.55+391533.4 or MASTER OT J172758.09+380021.5 (see VSOLJ Variable Star Bulletin No. 113). The spectral type DC:, however, by Skiff (see AAVSO VSX) would favor a hydrogen-poor object. The current outburst appears to be a superoutburst and time-resolved photometry is encouraged. YYYYMMDD(UT) mag observer 20230705.8343 <16.309g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.8535 <16.794g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.3509 15.533g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.4367 15.660g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3381 15.626g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.1767 15.869g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27886] V803 Cen: cyclic state after dip
by Taichi Kato 10 Jul '23

10 Jul '23

V803 Cen: cyclic state after dip Entered a short-period cyclic state after the dip on July 2 (data: Josch Hambsch).

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[vsnet-alert 27885] V1052 Cyg standstill
by Taichi Kato 10 Jul '23

10 Jul '23

V1052 Cyg standstill Some sign of standstill also in 2017 (somewhat IW And-like). YYYYMMDD(UT) mag observer 20230406.5844 16.809g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230406.6122 16.712o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230406.6212 16.623o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230406.6344 16.659o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230406.6405 16.650o (ATLAS Forced Photometry (Tonry+2018; Shingles+2021)) 20230408.4765 16.372zr (ZTF Alert DC mag (Masci+ 2019)) 20230408.4765 16.403zr (Zwicky Transient Facility (Masci et al., 2019)) 20230408.4862 16.490zg (ZTF Alert DC mag (Masci+ 2019)) 20230408.4862 16.510zg (Zwicky Transient Facility (Masci et al., 2019)) 20230408.8494 <143c (Yutaka Maeda) 20230409.5706 15.858g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230410.4366 16.051zr (Zwicky Transient Facility (Masci et al., 2019)) 20230410.4366 16.052zr (ZTF Alert DC mag (Masci+ 2019)) 20230410.4877 16.042zg (ZTF Alert DC mag (Masci+ 2019)) 20230410.4877 16.056zg (Zwicky Transient Facility (Masci et al., 2019)) 20230412.8225 <160c (Yutaka Maeda) 20230414.5398 17.083g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230415.4498 17.380zg (ZTF Alert DC mag (Masci+ 2019)) 20230415.4498 17.604zg (Zwicky Transient Facility (Masci et al., 2019)) 20230415.4876 17.213zr (Zwicky Transient Facility (Masci et al., 2019)) 20230416.5342 16.952g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230416.8183 <153c (Yutaka Maeda) 20230419.4480 17.253zr (Zwicky Transient Facility (Masci et al., 2019)) 20230422.5200 15.844g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230425.5159 16.361g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230427.4057 16.450g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230501.3995 16.553zr (Zwicky Transient Facility (Masci et al., 2019)) 20230501.3995 16.578zr (ZTF Alert DC mag (Masci+ 2019)) 20230501.4461 16.748zg (Zwicky Transient Facility (Masci et al., 2019)) 20230502.8056 <156c (Yutaka Maeda) 20230505.4995 16.133g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230505.4995 16.189g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230507.4821 16.665g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.4783 16.666g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230508.5591 16.595g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230509.4056 16.834zr (ZTF Alert DC mag (Masci+ 2019)) 20230509.4338 16.903zg (ZTF Alert DC mag (Masci+ 2019)) 20230509.8009 <155c (Yutaka Maeda) 20230511.8224 <147c (Yutaka Maeda) 20230513.4098 16.186zg (ZTF Alert DC mag (Masci+ 2019)) 20230513.4425 16.149zr (ZTF Alert DC mag (Masci+ 2019)) 20230515.4238 16.341zr (ZTF Alert DC mag (Masci+ 2019)) 20230515.4438 16.420zg (ZTF Alert DC mag (Masci+ 2019)) 20230516.8096 <141c (Yutaka Maeda) 20230518.4491 16.564zr (ZTF Alert DC mag (Masci+ 2019)) 20230520.4098 16.417zr (ZTF Alert DC mag (Masci+ 2019)) 20230520.4226 16.404zg (ZTF Alert DC mag (Masci+ 2019)) 20230522.4324 16.440zg (ZTF Alert DC mag (Masci+ 2019)) 20230525.4301 16.614zg (ZTF Alert DC mag (Masci+ 2019)) 20230525.4541 16.528zr (ZTF Alert DC mag (Masci+ 2019)) 20230528.3466 16.538zg (ZTF Alert DC mag (Masci+ 2019)) 20230531.3061 16.799g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230601.3888 16.796g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230602.3736 <16.498g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230602.7476 <153c (Yutaka Maeda) 20230603.4166 16.468zr (ZTF Alert DC mag (Masci+ 2019)) 20230603.4507 16.576zg (ZTF Alert DC mag (Masci+ 2019)) 20230603.7506 <163c (Yutaka Maeda) 20230605.4305 16.447zr (ZTF Alert DC mag (Masci+ 2019)) 20230605.4473 16.535zg (ZTF Alert DC mag (Masci+ 2019)) 20230607.3498 <16.268g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230608.3504 16.466g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230615.3714 16.295g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230615.7186 159:c (Yutaka Maeda) 20230615.7186 159:c (Yutaka Maeda) 20230617.4447 16.428g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230623.4679 16.534g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230627.3354 16.511g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.3442 16.501g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230629.4415 16.422g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.4886 16.364g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.2709 <16.177g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.1433 15.95cG (Masao Funada) 20230707.5404 16.161g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.1545 16.28cG (Masao Funada) 20230709.3671 16.430g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27884] Re: NSV21190: eclipsing symbiotic star currently undergoing symbiotic nova outburst?
by Taichi Kato 09 Jul '23

09 Jul '23

Re: NSV21190: eclipsing symbiotic star currently undergoing symbiotic nova outburst? The object turned out to be an R CrB star. https://www.aavso.org/vsx/index.php?view=detail.top&oid=59625 https://ui.adsabs.harvard.edu/abs/2020A%26A...635A..14T/abstract Relatively periodic behavior in 2017-2020 would suggest the pulsation origin like DY Per stars.

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[vsnet-alert 27883] NSV21190: eclipsing symbiotic star currently undergoing symbiotic nova outburst?
by Taichi Kato 07 Jul '23

07 Jul '23

NSV21190: eclipsing symbiotic star currently undergoing symbiotic nova outburst? Yamamoto had reported brightening of this object in April. YYYYMMDD(UT) mag observer 20230422.744 132c (Minoru Yamamoto) Tadashi Kojima-san has reported that the object has been bright for months. object YYYYMMDD(UT) mag code NSV21190 20230331.758 128c Tko.VSOLJ NSV21190 20230517.629 128c Tko.VSOLJ NSV21190 20230617.503 128c Tko.VSOLJ NSV21190 20230706.553 127c Tko.VSOLJ This object has been suggested to be a large-amplitude variable star TerzV910 (suspected to be a Mira star based on IRAS identification). ASAS-SN data https://asas-sn.osu.edu/sky-patrol/coordinate/d5a29922-5bc0-4e1e-824e-086ac… and ATLAS observations suggest that this object appears to be an eclipsing symbiotic object, rather than a Mira star, which became active (at least) in in 2017. The minima occurred JD 2458240:, 2458660, 2459060: (P about 410 d?). The object once became faint in later 2020-later 2021, and then brightened to the current bright state. A shallow minimum around JD 2459830 during the present bright state may be an eclipse (the period then is around 400 d). The object was faint during ASAS-3 observations (2000-2009). The object is currently slowly brightening and would be another symbiotic nova (the shallow eclipse may be explained by a nova photosphere). The position is somewhat different between 2MASS and Gaia: 2MASS 171453.440 -283746.69 (2000.0) 15.129 12.170 9.707 171453.437 -283746.95 (2000.0) Gaia_DR2_4107611274955676672 plx=-(-) dismod=- pmra=-(-) pmdec=-(-) G=19.526 BP=20.104 RP=17.634 171453.437 -283746.96 (2000.0) Gaia_EDR3_4107611274955676672 plx=2.187(0.418) dismod=8.3 pmra=-6.604(0.411) pmdec=-7.609(0.337) G=19.598 BP=20.516 RP=18.301 I used the 2MASS location.

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[vsnet-alert 27882] PNV J18553862+1457343: new WZ Sge-type dwarf nova
by Taichi Kato 07 Jul '23

07 Jul '23

PNV J18553862+1457343: new WZ Sge-type dwarf nova Early superhumps: P=0.06080(4) d, amplitude 0.04 mag. Ordinary superhumps (stage A?): P=0.06282(10) d, 0.07 mag. Corresponding q=0.088 Likely period bouncer with multiple rebeightenings. Observers: Itoh-san, Stephen Brincat, Josch Hambsch, Tamas Tordai

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[vsnet-alert 27880] Follow-up CCD observations of TCP J16272388-4601564
by Filipp Romanov 03 Jul '23

03 Jul '23

Hello! I am attaching my follow-up observations of TCP J16272388-4601564 (classified as a Galactic classical nova in the ATel #16111 https://www.astronomerstelegram.org/?read=16111 ). Observer: Filipp Romanov (AAVSO). Remotely using iTelescope.Net T72 (0.51-m f/6.8 Corrected Dall-Kirkham + CCD) of Deep Sky Chile at Rio Hurtado Valley, Chile. Exposures: 300 sec. for each image. TCP J16272388-4601564 20230703.17345 12.042I RFD 0.008 TCP J16272388-4601564 20230703.17240 12.032I RFD 0.008 TCP J16272388-4601564 20230703.17137 12.005I RFD 0.012 TCP J16272388-4601564 20230703.17024 13.642R RFD 0.008 TCP J16272388-4601564 20230703.16919 13.623R RFD 0.007 TCP J16272388-4601564 20230703.16817 13.661R RFD 0.010 TCP J16272388-4601564 20230703.16689 17.170B RFD 0.083 TCP J16272388-4601564 20230703.16342 17.208B RFD 0.105 TCP J16272388-4601564 20230703.16239 17.047B RFD 0.098 TCP J16272388-4601564 20230703.16125 15.437V RFD 0.033 TCP J16272388-4601564 20230703.16020 15.441V RFD 0.022 TCP J16272388-4601564 20230703.15917 15.472V RFD 0.017 TCP J16272388-4601564 20230703.15636 12.004I RFD 0.005 TCP J16272388-4601564 20230703.15226 13.643R RFD 0.005 TCP J16272388-4601564 20230703.14808 17.228B RFD 0.063 TCP J16272388-4601564 20230703.14387 15.451V RFD 0.016 With best wishes, Filipp.

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[vsnet-alert 27879] HO Del superoutburst
by Taichi Kato 03 Jul '23

03 Jul '23

HO Del superoutburst (Known SU UMa star) YYYYMMDD(UT) mag observer 20230623.0146 <144 (Eddy Muyllaert) 20230623.4563 16.066g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230624.0194 137 (Eddy Muyllaert) 20230624.033 139 (Gary Poyner) 20230625.0222 136 (Eddy Muyllaert) 20230625.056 138 (Gary Poyner) 20230625.139 14.03C (Gary Poyner) 20230625.1402 14.07cG (Masao Funada) 20230625.4061 13.763g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230626.060 140 (Gary Poyner) 20230628.1662 13.935g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.2162 13.997g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.2689 13.791g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230629.3589 14.120g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.3508 14.202g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.3620 14.19cG (Masao Funada) 20230701.3654 14.62cG (Masao Funada) 20230701.3676 14.293g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27878] ASASSN-15aq superoutburst
by Taichi Kato 03 Jul '23

03 Jul '23

ASASSN-15aq superoutburst YYYYMMDD(UT) mag observer 20230623.0403 17.860g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230624.2844 <18.036g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.2786 13.812g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230629.3028 13.653g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.2952 13.469g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.3827 13.69cG (Masao Funada) 20230702.0130 13.574g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.2698 13.707g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27877] Re: FL Psc: rapid fading on June 26
by Taichi Kato 01 Jul '23

01 Jul '23

Re: FL Psc: rapid fading on June 26 Recent data: YYYYMMDD(UT) mag observer 20230622.2089 123cG (Masao Funada) 20230623.210 12.11C (Gary Poyner) 20230623.5319 12.123g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230624.197 12.20C (Gary Poyner) 20230625.208 12.38C (Gary Poyner) 20230626.5207 13.652g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230627.208 14.75C (Gary Poyner) 20230628.3570 15.245g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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