July 2023 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27892] ASASSN-17mj possible superoutburst
by Taichi Kato 11 Jul '23

11 Jul '23

ASASSN-17mj possible superoutburst Type from ASAS-SN(ver2). Precursor+superoutburst in 2019 Oct. YYYYMMDD(UT) mag observer 20230705.7769 16.297g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.7714 16.366g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.1696 <15.496g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.1776 15.989g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0732 14.939g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0879 14.881g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230710.2584 14.10cG (Masao Funada)

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[vsnet-alert 27891] ASASSN-16gg likely superoutburst
by Taichi Kato 09 Jul '23

09 Jul '23

ASASSN-16gg likely superoutburst Type from ASAS-SN(ver2)+ATLAS. YYYYMMDD(UT) mag observer 20230623.0415 16.481g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230625.1712 16.604g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230625.2140 16.729g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0950 16.657g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230629.2036 13.745g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.1156 13.887g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.1656 13.803g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.9571 13.951g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.0617 14.193g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.9074 14.532g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.2168 14.528g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0535 14.640g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27890] CRTS J162619.8-125557 possible outburst
by Taichi Kato 09 Jul '23

09 Jul '23

CRTS J162619.8-125557 possible outburst Can be a noise. UGSU:+E YYYYMMDD(UT) mag observer 20230705.3443 <16.131g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.9503 <16.039g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.2367 <16.916g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.3460 <16.840g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.8613 <16.402g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.2129 <16.645g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3374 16.785g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0086 17.173g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27889] ASASSN-15im likely superoutburst
by Taichi Kato 09 Jul '23

09 Jul '23

ASASSN-15im likely superoutburst Combined magnitudes, but the phenomenon is real. Type from ASAS-SN DB. Supercycle about 150 d. YYYYMMDD(UT) mag observer 20230625.3131 16.177g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230625.9705 16.574g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230626.0591 16.149g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230626.9640 16.590g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230626.9957 16.742g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230627.0469 16.280g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0241 16.155g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0440 16.096g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0593 16.818g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230628.0593 16.830g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.1421 15.136g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.1731 15.214g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.8416 15.256g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230630.9211 14.881g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.0663 15.158g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.0743 15.047g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.9981 15.319g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.0378 14.846g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.7841 14.913g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.0061 15.318g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.7720 15.537g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.2761 15.083g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.7618 15.251g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.0262 15.439g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.1891 15.547g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.7363 15.703g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.7635 15.431g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230707.3081 15.541g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3069 15.470g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.0045 15.590g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27888] ASASSN-14cy outburst?
by Taichi Kato 09 Jul '23

09 Jul '23

ASASSN-14cy outburst? Rather noisy data, but could be a real outburst. YYYYMMDD(UT) mag observer 20230701.2490 <16.859g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.8498 <16.476g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230701.9671 <16.780g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.1331 <16.537g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.8801 <16.518g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230702.8915 <16.387g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.2478 <16.398g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.2948 <16.241g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230703.9294 15.805g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.1993 <16.376g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.9115 <16.900g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230704.9127 <15.794g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.1662 <16.715g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230705.8459 <16.643g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.0333 <16.387g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230706.8337 <16.209g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230708.3183 16.025g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230709.1847 16.461g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014))

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[vsnet-alert 27887] V2276 Sgr outburst (AM CVn?)
by Taichi Kato 09 Jul '23

09 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 09 Jul '23

09 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 09 Jul '23

09 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 08 Jul '23

08 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 06 Jul '23

06 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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