February 2022 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 26595] MASTER OT J185838.73+460207.2 superoutburst
by Taichi Kato 19 Feb '22

19 Feb '22

MASTER OT J185838.73+460207.2 superoutburst YYYYMMDD(UT) mag observer 20220130.8910 <149c (Yutaka Maeda) 20220201.8587 <146c (Yutaka Maeda) 20220208.8776 <154c (Yutaka Maeda) 20220210.8856 <152c (Yutaka Maeda) 20220211.5110 15.403zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220211.5322 15.700zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220213.4928 15.426zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220215.4995 15.982zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220218.5156 16.111zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220218.5293 16.324zr (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-alert 26594] SX LMi possible superoutburst
by Taichi Kato 19 Feb '22

19 Feb '22

SX LMi possible superoutburst Faint superoutburst? YYYYMMDD(UT) mag observer 20220210.6356 <157c (Yutaka Maeda) 20220210.9417 <142 (Eddy Muyllaert) 20220212.1599 171C (Masao Funada) 20220213.041 17.11C (Gary Poyner) 20220213.0417 16.88C (Eddy Muyllaert) 20220213.3014 17.268zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220215.6404 146:cG (Yutaka Maeda) 20220215.6405 146:cG (Yutaka Maeda) 20220218.2036 14.218zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220218.4051 14.104zr (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-alert 26593] V589 Her likely superoutburst
by Taichi Kato 19 Feb '22

19 Feb '22

V589 Her likely superoutburst YYYYMMDD(UT) mag observer 20220208.8042 <150c (Yutaka Maeda) 20220210.8120 <152c (Yutaka Maeda) 20220213.4457 18.461zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220218.4712 15.285zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220218.4958 15.113zg (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-alert 26592] ASASSN-22bs: periods of superhumps and early superhumps (WZ Sge star)
by Taichi Kato 18 Feb '22

18 Feb '22

ASASSN-22bs: periods of superhumps and early superhumps (WZ Sge star) Kyoto U team, Kiyota-san, Itoh-san, Tonny Vanmunster, Josch Hambsch, Stephen Brincat and Berto Monard have reported observations. The superhump period has been determined to be 0.05710(7) d. By using this identification, the period of early superhumps has been determined to be 0.05630(3) d (full amplitude 0.025 mag). The object is established to be a WZ Sge star.

1 0

[vsnet-alert 26591] TCP J14420760-1758238: superhump period
by Taichi Kato 18 Feb '22

18 Feb '22

TCP J14420760-1758238: superhump period Josch Hambsch has reported further observations. The superhump period is 0.06335(8) d. The current mean amplitude is 0.11 mag.

1 0

[vsnet-alert 26590] ASASSN-22bs: new SU UMa (likely WZ Sge) star
by Taichi Kato 18 Feb '22

18 Feb '22

ASASSN-22bs: new SU UMa (likely WZ Sge) star According to the most recent data by Josch Hambsch, ordinary superhumps appeared on Feb. 16. The current period is about 0.06 d (amplitude 0.25 mag). Considering the relatively long waiting time (8 d), this object is likely a borderline WZ Sge/SU UMa system.

1 0

[vsnet-alert 26589] (fwd) ASASSN-18vi/ZTF18abtudfk
by Taichi Kato 17 Feb '22

17 Feb '22

(fwd) ASASSN-18vi/ZTF18abtudfk From: Jan van Roestel <jcjvanroestel(a)gmail.com> Subject: [vsnet-outburst 28357] ASASSN-18vi/ZTF18abtudfk Date: Sat, 12 Feb 2022 19:31:33 -0800 On the morning of Feb 12, we obtained a lightcurve of=20 ASASSN-18vi/ZTF18abtudfk with KPED (https://kped.org/).=C2=A0 We used g-b= and=20 and a 10s cadence with a total duration of 1hr. The lightcurve shows a=20 clear periodic signal with a period of 16.3+/-0.2 minutes and an=20 amplitude of 2.2+/-0.7%. This strongly suggests this object is an AM CVn=20 star; likely with an orbital period of 33 minutes. Dr. Jan van Roestel, ZTF-collaboration

1 0

[vsnet-alert 26564] ASASSN-14fe: new SU UMa-type dwarf nova
by Taichi Kato 16 Feb '22

16 Feb '22

ASASSN-14fe: new SU UMa-type dwarf nova Berto Monard have reported observations. The data confirmed long-period (more than 0.08 d) superhumps. Re-analysis of the 2020 data yielded the most likely period of 0.08908(6) d (allowing one-day aliases) and an amplitude of 0.12 mag. The 2020 data were also obtained by Berto Monard. Let's hope that the correct alias will be established during the current superoutburst.

2 1

[vsnet-alert 26587] TCP J17453768-1756253 likely superoutburst (since Feb. 14)
by Patrick Schmeer 16 Feb '22

16 Feb '22

TCP J17453768-1756253 (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=400236 Complete ASAS-SN Sky Patrol light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/7d06f877-36ab-4af0-870a-30f4a… TCPJ17453768-1756253 20220212.1064 <16.46g ASN TCPJ17453768-1756253 20220214.5265 12.88g ASN TCPJ17453768-1756253 20220214.5277 12.83g ASN TCPJ17453768-1756253 20220216.3580 12.60g ASN TCPJ17453768-1756253 20220216.3593 12.57g ASN TCPJ17453768-1756253 20220216.3606 12.63g ASN ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF19aaxrxyc/ Gaia (Photometric) Science Alerts data: http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia18cft/ The current outburst was (also) detected by H. Nishimura (vsnet-outburst 28360, see below). Time-resolved photometry is encouraged. 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 Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M ------- H. Maehara wrote on Wednesday, 16 February 2022 at 19:01:00 UTC: Nishimura-san reported an outburst of TCP J17453768-1756253 (UGSU). object YYYYMMDD(UT) mag code TCPJ17453768-1756253 20220215.82341 118c Nmh.VSOLJ Observer: Hideo Nishimura (Shizuoka, Japan) Instruments: f.l.=200mm(F=3.2) lens + Canon EOS 6D

1 0

[vsnet-alert 26586] TCP J14420760-1758238: new SU UMa star
by Taichi Kato 15 Feb '22

15 Feb '22

TCP J14420760-1758238: new SU UMa star Josch Hambsch's most recent data detected ordinary superhumps with an approximate period of 0.06 d. The amplitude is currently 0.05 mag.

1 0