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

[vsnet-alert 26401] ASASSN-21uh: most likely an AM CVn object with a WZ Sge-type superoutburst or a WZ Sge object with type-E rebrightenings
by Naoto Kojiguchi 11 Nov '21

11 Nov '21

ASASSN-21uh: most likely an AM CVn object with a WZ Sge-type superoutburst or a WZ Sge object with type-E rebrightenings Taguchi-san found that ASASSN-21uh had a temporary dip a week after the outburst by using ZTF data (ALeRCE) and ASAS-SN data. This object is most likely an AM CVn object with a WZ Sge-type superoutburst or a WZ Sge object with type-E rebrightenings. Spectroscopy is encouraged. ALeRCE: https://alerce.online/object/ZTF21ackbkbn ASAS-SN Sky Patrol (20 days): https://asas-sn.osu.edu/sky-patrol/coordinate/ce4f98bb-179e-4b61-8d6b-8d7ce… ASAS-SN Sky Patrol (all): https://asas-sn.osu.edu/sky-patrol/coordinate/f25d1265-e2e0-4d06-965d-58ea5… ASASSN-21uh --- ------- 19:34:30.71 47:39:6.9 2021-10-31.18 15.5 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.4, g>18.3 on 2021-10-30.22, g=15.9 on 2021-10-31.19. IDs: 053741.285 +473906.626 PS1_DR1_165182936280562816 g=20.3844(0.0177) r=--(--) i=--(--) z=20.5024(0.1437) y=--(--) 053744.551 +473909.642 PS1_DR1_165182936289423720 g=--(--) r=21.7877(0.2405) i=--(--) z=--(--) y=19.4201(0.1117) 053741.522 +473906.720 PS1_DR2_165182936280562816 g=22.2087(0.078856) r=22.2866(0.087181) i=23.2862(0.255626) z=25.0042(2.79944) y=21.9475(0.389282) ASASSN-21uh 20211030.223 <17.247g ASN ASASSN-21uh 20211031.185 15.793g ASN (outburst) ASASSN-21uh 20211031.210 16.218o ATF ASASSN-21uh 20211102.202 16.250zr ZLR ASASSN-21uh 20211102.505 16.10:C Myy ASASSN-21uh 20211103.214 16.137g ASN ASASSN-21uh 20211103.540 16.44C Myy ASASSN-21uh 20211104.159 16.525zr ZLR ASASSN-21uh 20211104.255 16.695o ATF ASASSN-21uh 20211104.438 16.430G GIA ASASSN-21uh 20211104.564 <145C Myy ASASSN-21uh 20211105.172 <16.864g ASN (dip) ASASSN-21uh 20211106.099 18.599zr ZLR ASASSN-21uh 20211106.135 19.281zg ZLR ASASSN-21uh 20211106.268 18.964cy ATF ASASSN-21uh 20211106.551 <167C Myy ASASSN-21uh 20211107.152 16.331g ASN (rebrightening) ASASSN-21uh 20211108.115 16.622zr ZLR ASASSN-21uh 20211108.197 16.841o ATF ASASSN-21uh 20211108.198 16.412zg ZLR ASASSN-21uh 20211108.213 16.785g ASN ASASSN-21uh 20211110.101 16.638g ASN ASASSN-21uh 20211110.198 17.130o ATF (ASN: ASAS-SN Sky Patrol, ATF: Atlas forced photometry, GIA: Gaia Alerts, Myy: Masayuki Moriyama, ZLR: Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26400] ASASSN-21um: new SU UMa-type dwarf nova
by Taichi Kato 10 Nov '21

10 Nov '21

ASASSN-21um: new SU UMa-type dwarf nova Tamas Tordai has reported observations. The object shows 0.17-mag superhumps with a period of 0.087(1) d.

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[vsnet-alert 26399] V347 Aur
by Taichi Kato 09 Nov '21

09 Nov '21

V347 Aur https://www.aavso.org/aavso-alert-notice-759 This object was classified as a "Mira" (of course, not correct) in ZTF variable star catalog. The ZTF data indeed showed Mira-like variation. There was a maximum reaching zg=12.6 in 2018 Nov. The present behavior may not be so special.

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[vsnet-alert 26398] ASASSN-18yi outburst!
by Taichi Kato 09 Nov '21

09 Nov '21

ASASSN-18yi outburst! Eclipsing SU UMa star above the period gap (P=0.16825 d). http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21fbh/ Gaia21fbh AT2021advs 2021-11-06 22:31:24 20.46764 -33.93771 15.36 18.84 1.08 CV 2021-11-07 20:20:40 outburst in confirmed CV ASASSN-18yi, previous outburst in lightcurve

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[vsnet-alert 26397] V606 Vul rapid fading: more complete data set
by Taichi Kato 09 Nov '21

09 Nov '21

V606 Vul rapid fading: more complete data set YYYYMMDD(UT) mag observer 20211031.506 119 (Hiroyuki Maehara) 20211031.7556 123 (Eddy Muyllaert) 20211101.3590 10.878Rc (Yasuo Sano) 20211101.3595 12.989B (Yasuo Sano) 20211101.3597 12.113V (Yasuo Sano) 20211101.3603 10.802C (Yasuo Sano) 20211101.6277 122V (Masayuki Moriyama) 20211101.6318 118C (Masayuki Moriyama) 20211101.7514 120 (Eddy Muyllaert) 20211101.962 119 (Gary Poyner) 20211102.433 128 (Takuichiro Onishi) 20211102.474 124 (Yoshiyasu Sato) 20211102.6065 12.73V (Masayuki Moriyama) 20211102.7576 124 (Eddy Muyllaert) 20211102.850 124 (Gary Poyner) 20211103.431 122 (Takuichiro Onishi) 20211103.494 124 (Yoshiyasu Sato) 20211103.6018 12.20V (Masayuki Moriyama) 20211104.408 132 (Takuichiro Onishi) 20211104.5663 136V (Masayuki Moriyama) 20211104.750 124 (Gary Poyner) 20211105.3628 10.930Rc (Yasuo Sano) 20211105.428 122 (Yoshiyasu Sato) 20211105.4457 12.979B (Yasuo Sano) 20211105.4459 12.169V (Yasuo Sano) 20211105.4464 11.025C (Yasuo Sano) 20211105.7514 123 (Eddy Muyllaert) 20211106.4210 13.09V (Minoru Sato) 20211106.5764 13.69V (Masayuki Moriyama) 20211106.5781 12.58Rc (Masayuki Moriyama) 20211106.5796 11.90Ic (Masayuki Moriyama) 20211106.5991 <14.51B (Masayuki Moriyama) 20211107.3990 15.152B (Yasuo Sano) 20211107.3998 12.872C (Yasuo Sano) 20211107.4003 14.282V (Yasuo Sano) 20211107.4006 12.565Rc (Yasuo Sano) 20211107.419 <143 (Takuichiro Onishi) 20211107.492 143 (Hiroyuki Maehara)

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[vsnet-alert 26338] 1RXS J063214.8+253620 (UG) first outburst since 2012
by Kirill Sokolovsky 08 Nov '21

08 Nov '21

Hi, The dwarf nova 1RXS J063214.8+253620 was found in outburst on the NMW survey images (135mm f/2.0 lens + unfiltered ST-8300M CCD): YYYYMMDD.D(UT) mag 20211020.9384 12.6CV The ASAS-SN lightcurve https://asas-sn.osu.edu/sky-patrol/coordinate/7272c442-c9b2-4ec3-b8a8-9780a… suggests the outburst started on 2021-10-19 and this is the first outburst since the discovery of this dwarf nova in 2012. The ASAS-SN data also suggest the presence of periodic modulation in minimum light. The quiescent K2 lightcurve of 1RXS J063214.8+253620 was modeled by https://ui.adsabs.harvard.edu/abs/2018AJ....156..153D/abstract VSX record for 1RXS J063214.8+253620: https://www.aavso.org/vsx/index.php?view=detail.top&oid=276839 Some of the previous messages on vsnet-alert discussing the 2012 outburst: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/14158 http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/14171 http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/14172 Best wishes, Kirill Sokolovsky, Stanislav Korotkiy, Olga Smolyankina

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[vsnet-alert 26395] Re: V606 Vul rapid fading
by Taichi Kato 08 Nov '21

08 Nov '21

Re: V606 Vul rapid fading 20211104.408 132 (Takuichiro Onishi) 20211104.750 124 (Gary Poyner) 20211105.7514 123 (Eddy Muyllaert) 20211107.492 143 (Hiroyuki Maehara) The object had already faded to V=13.6 on Nov. 4.

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[vsnet-alert 26394] V606 Vul rapid fading
by Taichi Kato 08 Nov '21

08 Nov '21

V606 Vul rapid fading YYYYMMDD(UT) mag observer 20211101.6277 122V (Masayuki Moriyama) 20211101.6318 118C (Masayuki Moriyama) 20211101.7514 120 (Eddy Muyllaert) 20211101.962 119 (Gary Poyner) 20211102.433 128 (Takuichiro Onishi) 20211102.474 124 (Yoshiyasu Sato) 20211102.6065 12.73V (Masayuki Moriyama) 20211102.7576 124 (Eddy Muyllaert) 20211102.850 124 (Gary Poyner) 20211103.431 122 (Takuichiro Onishi) 20211103.494 124 (Yoshiyasu Sato) 20211103.6018 12.20V (Masayuki Moriyama) 20211104.408 132 (Takuichiro Onishi) 20211104.750 124 (Gary Poyner) 20211105.7514 123 (Eddy Muyllaert) 20211107.492 143 (Hiroyuki Maehara)

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[vsnet-alert 26390] TCP J07363658+4151215: most likely helium WZ Sge-type dwarf nova
by Taichi Kato 06 Nov '21

06 Nov '21

TCP J07363658+4151215: most likely helium WZ Sge-type dwarf nova Kyoto U. team has reported observations. The data show early superhumps with an amplitudes of 0.05 mag. The period is 0.0280(2) d. This object is most likely a helium WZ Sge star. The SDSS color (very blue u-g=+0.27) is consistent.

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[vsnet-alert 26388] PV Per superoutburst
by Taichi Kato 04 Nov '21

04 Nov '21

PV Per superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20211028.6856 <146c (Yutaka Maeda) 20211029.6982 <148c (Yutaka Maeda) 20211030.928 <152 (Gary Poyner) 20211031.6835 <163c (Yutaka Maeda) 20211101.6974 155:cG (Yutaka Maeda) 20211102.6710 151c (Yutaka Maeda) 20211103.2152 14.928zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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