November 2021 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26408] ASASSN-18yi: superhump + eclipse
by Taichi Kato 12 Nov '21

12 Nov '21

ASASSN-18yi: superhump + eclipse Josch Hambsch has reported observations. The object showed a superhump + eclipse. The current outburst is a superoutburst (first since 2018).

1 0

[vsnet-alert 26407] MGAB-V3593 bright outburst
by Taichi Kato 12 Nov '21

12 Nov '21

MGAB-V3593 bright outburst Superoutburst in 2021 Aug. Too early for the next one? YYYYMMDD(UT) mag observer 20211029.4246 158C (Masayuki Moriyama) 20211107.4207 149C (Masayuki Moriyama)

1 0

[vsnet-alert 26406] MASTER OT J204723.04+072759.1 possible superoutburst
by Taichi Kato 12 Nov '21

12 Nov '21

MASTER OT J204723.04+072759.1 possible superoutburst Possible type from ZTF data. Possible superoutburst + rebrightening in 2020 June. YYYYMMDD(UT) mag observer 20211031.4642 <159c (Yutaka Maeda) 20211101.4775 <154c (Yutaka Maeda) 20211102.4517 <150c (Yutaka Maeda) 20211103.4550 <160c (Yutaka Maeda) 20211107.4652 <152cG (Yutaka Maeda) 20211111.1108 15.345zg (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-alert 26405] CRTS J175633.3+572927 possible superoutburst
by Taichi Kato 12 Nov '21

12 Nov '21

CRTS J175633.3+572927 possible superoutburst Possible type from ZTF data. YYYYMMDD(UT) mag observer 20211103.1229 17.439zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211103.1401 17.669zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211105.0982 17.208zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211107.1200 16.682zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211109.1362 16.602zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.1208 16.717zg (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-alert 26404] CRTS J224753.9+235522 likely superoutburst
by Taichi Kato 12 Nov '21

12 Nov '21

CRTS J224753.9+235522 likely superoutburst The light curve looks likes a superoutburst. YYYYMMDD(UT) mag observer 20211015.1007 <180C (Eddy Muyllaert) 20211102.2383 15.465zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211102.2780 15.252zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211102.2822 15.214zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211104.1736 15.704zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211104.1760 15.681zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211104.2397 15.537zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.1524 15.738zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.1638 15.758zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.2258 15.948zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.2273 15.998zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.1297 16.147zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.1760 16.540zr (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-alert 26403] ASASSN-19sk: rapid fading
by Taichi Kato 12 Nov '21

12 Nov '21

ASASSN-19sk: rapid fading YYYYMMDD(UT) mag observer 20211104.5250 <161c (Yutaka Maeda) 20211105.8132 <143 (Eddy Muyllaert) 20211107.5478 124cG (Yutaka Maeda) 20211107.7905 126CV (NMW survey) 20211108.1338 14.293zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.8014 129 (Eddy Muyllaert) 20211109.887 14.71C (Gary Poyner) Itoh-san reported observations on two night. No superhump-like variation was seen on rapid fading.

1 0

[vsnet-alert 26402] ASASSN-14fq likely superoutburst (since Oct. 31)
by Patrick Schmeer 12 Nov '21

12 Nov '21

ASASSN-14fq (UGSU:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=399161 Recent ASAS-SN Sky Patrol light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/30026e02-aae2-4312-9f9b-98222… ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF20aaukual/ The current outburst started on 2021 October 31. Previous outbursts were recorded from 2014 August 16 to 25 and from 2020 March 19 to April 5 (rebrightening observed on April 15 by Gaia, see below). Time-resolved photometry is required. 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 Asteroid Terrestrial-impact Last Alert System (ATLAS): - Tonry et al., 2018PASP..130f4505T Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M ------- Am Freitag, 17. April 2020, 11:47:32 MESZ hat Patrick Schmeer pasc1312-aavso(a)yahoo.de via vsnet-alert <vsnet-alert(a)ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben: ASASSN-14fq (UGWZ:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=399161 Gaia detection (Gaia20buz): http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia20buz/ ASASSN-14fq 20200322.224 15.42G Gaia ASASSN-14fq 20200415.255 17.46G Gaia ASASSN-14fq 20200415.329 17.41G Gaia Complete ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) light curve and data: https://asas-sn.osu.edu/light_curves/8f0c73ae-a13b-4ebc-b9c3-f5bfcbec7d32 A previous (long) outburst was recorded 2014 August 16–25. Time-resolved photometry is encouraged (at least snapshots). Clear skies, Patrick

1 0

[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))

1 0

[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.

1 0

[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.

1 0

2024

2023

2022

2021

vsnet-alert November 2021