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

[vsnet-alert 26791] Re: V482 Cyg fading (since May 1)
by Taichi Kato 25 May '22

25 May '22

Re: V482 Cyg fading (since May 1) Early phase of R CrB-type fading is notoriously difficult to notice visually. Here is the comparison. YYYYMMDD(UT) mag observer 20220415.5439 11.517g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.5452 11.511g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.5464 11.525g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6268 11.554g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6281 11.543g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.6293 11.539g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.3998 11.553g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.4010 11.521g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.4023 11.476g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220419.7100 108cG (Yutaka Maeda) 20220423.6060 11.584g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.6072 11.587g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.6085 11.597g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.4842 11.537g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.4855 11.550g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5062 11.563g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5074 11.562g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5087 11.575g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5408 11.576g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5421 11.554g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220426.5433 11.556g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4971 11.561g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4983 11.603g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.4996 11.621g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5310 11.615g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5323 11.623g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220430.5336 11.616g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4859 11.683g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4871 11.639g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.4884 11.654g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5653 11.690g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5666 11.659g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220501.5678 11.674g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4526 11.855g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4539 11.876g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.4552 11.815g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220505.9701 108 (Jose Ripero) 20220507.9868 108 (Jose Ripero) 20220508.3992 12.067g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.4005 11.996g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.4018 12.116g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220508.9590 110 (Eddy Muyllaert) 20220509.078 109 (Gary Poyner) 20220511.4713 12.305g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.4726 12.321g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.4739 12.270g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5409 12.328g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5421 12.342g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220511.5434 12.356g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3077 12.430g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3089 12.368g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3103 12.440g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3552 12.462g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3565 12.428g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220513.3578 12.452g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220515.2920 12.648g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220515.2934 12.586g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220516.4594 12.619g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220516.4608 12.734g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.062 115 (Gary Poyner) 20220521.4143 12.780g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4155 12.781g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4168 12.777g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4567 12.789g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4580 12.806g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.4592 12.815g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220521.9819 119 (Eddy Muyllaert) 20220524.149 11.84C (Gary Poyner) 20220524.149 12.02TG (Gary Poyner) 20220524.606 120 (Hiroyuki Maehara)

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[vsnet-alert 26789] V482 Cyg fading (since May 1)
by Patrick Schmeer 24 May '22

24 May '22

V482 Cygni (RCB) https://www.aavso.org/vsx/index.php?view=detail.top&oid=11402 The current fading began in early May 2022 according to ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data (complete): https://asas-sn.osu.edu/sky-patrol/coordinate/2c766f33-797f-437f-9109-bff0e… AAVSO data: https://app.aavso.org/webobs/results/?star=V482+Cyg Photometric (e.g. V band) and spectroscopic observations are encouraged. The Vmag range in VSX is 10.65 - <14.5. Clear skies, Patrick ------- Gary Poyner wrote on Monday, 23 May 2022 at 15:35:18 UTC: There is a suggestion that the RCB star V482 Cyg may be fading. The star has been pretty much inactive since June 1996 when it faded to magnitude 13.0 and recovered to maximum brightness 12 months later (a deeper fade to magnitude 15.0 occured in 1990). Since then there have been small amplitude variations of 0.5 mag either side of magnitude 11.0. Latest magnitude in the AAVSO database is 11.9mv. Charts are available from both BAAVSS and AAVSO. Further observations are requested. Gary ------------------------------------------------------ Gary Poyner FRAS garypoyner(a)gmail.com www.variablestars.co.uk

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[vsnet-alert 26788] ASASSN-14bp likely superoutburst
by Taichi Kato 24 May '22

24 May '22

ASASSN-14bp likely superoutburst YYYYMMDD(UT) mag observer 20220503.4812 <140c (Yutaka Maeda) 20220504.6941 <147C (Masayuki Moriyama) 20220507.4672 <148c (Yutaka Maeda) 20220523.594 143 (Rod Stubbings)

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[vsnet-alert 26787] XM116HT: ordinary superhumps
by Taichi Kato 23 May '22

23 May '22

XM116HT: ordinary superhumps According to observations by Tamas Tordai on May 22-23, ordinary superhumps were present. They were not apparent a day before.

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[vsnet-alert 26786] SS UMi superoutburst
by Taichi Kato 23 May '22

23 May '22

SS UMi superoutburst YYYYMMDD(UT) mag observer 20220517.5589 <151c (Yutaka Maeda) 20220517.6916 <167C (Masayuki Moriyama) 20220518.5611 <153c (Yutaka Maeda) 20220521.040 144 (Gary Poyner) 20220521.5408 139cG (Yutaka Maeda) 20220521.5408 139cG (Yutaka Maeda) 20220521.637 142C (Mitsutaka Hiraga)

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[vsnet-alert 26785] ASASSN-13at superoutburst
by Taichi Kato 23 May '22

23 May '22

ASASSN-13at superoutburst YYYYMMDD(UT) mag observer 20220511.3625 20.186zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220511.4506 19.763zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220514.7069 <158c (Yutaka Maeda) 20220517.6892 <160c (Yutaka Maeda) 20220517.7838 <167C (Masayuki Moriyama) 20220518.6355 141C (Masayuki Moriyama) 20220518.6895 140cG (Yutaka Maeda) 20220518.6896 140cG (Yutaka Maeda) 20220520.1740 14.07C (Masao Funada) 20220521.6647 140cG (Yutaka Maeda)

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[vsnet-alert 26784] ASASSN-20pv: still bright (AM CVn)
by Taichi Kato 23 May '22

23 May '22

ASASSN-20pv: still bright (AM CVn) YYYYMMDD(UT) mag observer 20220422.0026 14.835g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.0038 15.042g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2409 15.492g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2422 15.322g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2436 15.395g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.606 143 (Rod Stubbings) 20220423.2442 15.314g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2455 15.455g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2468 15.419g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.2435 15.497g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.592 144 (Rod Stubbings) 20220425.376 154 (Rod Stubbings) 20220425.592 143 (Rod Stubbings) 20220425.624 144 (Rod Stubbings) 20220428.560 143 (Rod Stubbings) 20220502.610 143 (Rod Stubbings) 20220502.682 143 (Rod Stubbings) 20220503.591 143 (Rod Stubbings) 20220505.562 143 (Rod Stubbings) 20220505.635 144 (Rod Stubbings) 20220505.701 144 (Rod Stubbings) 20220509.599 144 (Rod Stubbings) 20220520.571 144 (Rod Stubbings) 20220521.633 144 (Rod Stubbings) 20220522.553 144 (Rod Stubbings)

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[vsnet-alert 26783] ASASSN-22gx: new SU UMa-type dwarf nova
by Taichi Kato 23 May '22

23 May '22

ASASSN-22gx: new SU UMa-type dwarf nova According to observations by Berto Monard on May 21-22, superhumps with a period of 0.0584(2) d and an amplitude of 0.19 mag were detected. Earlier observations on May 14 and 15 by Josch Hambsch did not detected apparent modulations.

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[vsnet-alert 26782] PNV J05222788-6936333
by Naoto Kojiguchi 21 May '22

21 May '22

PNV J05222788-6936333 PNV J05222788-6936333 2022 05 21.8916* 05 22 27.88 -69 36 33.3 12.5 U Dor 9 0 2022 05 21.8916 Discovered by C. Jacques, C. Colesanti, C. Barreto, E. Pimentel, J. Ribeiro, M. Domingues, J. Amancio, L. Amaral, P. Holvorcem, T. Napoleao on behalf of the Brazilian Transient Search - BraTS - at SONEAR Observatory, Oliveira, Brazil in three frames with 20 seconds exposure using an astrograph 280mm f/2.2 + CCD unfiltered, with magnitude 12.5 under limiting mag = 17.8. Nothing is visible at this location on the previous frames (limiting mag = 17.8) taken on 2022 01 15.28 UT. Possible Nova in LMC. IDs: 052227.803 -693633.241 Gaia_DR2_4657985010083189504 Plx=-1.4544(0.504) dismod=-- pmRA=0.548(0.87) pmDE=-7.839(1.016) G=18.882(0.0077) BP-RP=0.6908 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- 052227.794 -693633.230 Gaia_EDR3_4657985010083189504 Plx=-0.0025(0.441) dismod=-- PM=3.36 pmRA=3.262(0.602) pmDE=-0.804(0.583) G=18.912672(0.008123) BP-RP=0.821734 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- ASASSN Sky Patrol (contaminated): https://asas-sn.osu.edu/sky-patrol/coordinate/12506ea4-7cd9-4af8-8fca-7b5f4… https://asas-sn.osu.edu/sky-patrol/coordinate/3f601dbf-16f0-4dfd-877a-92c28… (Image Subtraction Photometry (Reference flux added)) PNVJ05222788-6936333 20220115.28 <17.8C (BraTS) PNVJ05222788-6936333 20220430.015 <158g ASN PNVJ05222788-6936333 20220501.720 118g ASN PNVJ05222788-6936333 20220502.731 105g ASN PNVJ05222788-6936333 20220503.008 104g ASN PNVJ05222788-6936333 20220504.733 101g ASN PNVJ05222788-6936333 20220505.001 105g ASN PNVJ05222788-6936333 20220506.954 105g ASN PNVJ05222788-6936333 20220508.735 107g ASN PNVJ05222788-6936333 20220509.981 111g ASN PNVJ05222788-6936333 20220510.984 111g ASN PNVJ05222788-6936333 20220511.703 111g ASN PNVJ05222788-6936333 20220512.974 114g ASN PNVJ05222788-6936333 20220513.733 115g ASN PNVJ05222788-6936333 20220514.972 115g ASN PNVJ05222788-6936333 20220515.694 117g ASN PNVJ05222788-6936333 20220516.709 118g ASN PNVJ05222788-6936333 20220517.708 119g ASN PNVJ05222788-6936333 20220518.956 121g ASN PNVJ05222788-6936333 20220519.951 122g ASN PNVJ05222788-6936333 20220521.696 123g ASN PNVJ05222788-6936333 20220521.8916 12.5C (BraTS)

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[vsnet-alert 26781] ASASSN-22ha
by Naoto Kojiguchi 20 May '22

20 May '22

ASASSN-22ha Large amplitude outburst of 8 mag. Possible WZ Sge-type dwarf nova. ASASSN-22ha --- ------- 8:7:59.09 60:26:53.5 2022-05-20.13 12.8 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=21.4, g>17.2 on 2022-05-18.11, g=13.3 on 2022-05-20.13 IDs: 080759.125 +602652.512 PS1_DR1_180531219963628258 g=21.4438(0.068) r=21.4156(0.0563) i=21.545(0.0406) z=--(--) y=--(--) 080759.122 +602652.592 PS1_DR2_180531219963628258 g=21.5517(0.042008) r=21.4654(0.04547) i=21.5728(0.041649) z=21.7294(0.133216) y=22.0424(0.369341) MPChecker: NO DATA ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/330dda91-d001-4ff7-947f-527ed… ASASSN-22ha 20220518.11 <172g ASN ASASSN-22ha 20220520.13 133g ASN

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