June 2022 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16430] ASASSN-22ho: new SU UMa-type dwarf nova

by tonny.vanmunster＠gmail.com

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-22ho, obtained on 2022, June 02/03 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. Regular superhumps with an amplitude of 0.35 mag are very clearly visible in the resulting light curve, establishing ASASSN-22ho as a new SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined (long) superhump period of 0.0902 +/- 0.0025d. The object was at mag CV = 16.5 on Jun 03rd. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory http://www.cbabelgium.com PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com

5 months, 4 weeks

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[vsnet-campaign-dn 16461] Re: ASASSN-18su

by Taichi Kato

Re: ASASSN-18su Superhumps were already detected during the 2018 superoutburst by Berto Monard. Superhumps appeared on 2018 Aug. 25. Due to the short visibility, the period was not determined.

11 months

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[vsnet-campaign-dn 16459] ASASSN-18su (super?)outburst (since June 24)

by Patrick Schmeer

ASASSN-18su (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=623474 ASASSN-18su was discovered on 2018 August 17. Unfortunately that outburst could be followed for only few days. After the seasonal gap a very long fading tail can be seen in ATLAS forced photometry data. T. Kato wrote (vsnet-alert 22429): "The Gaia proper motion is comparable to that of OV Boo ... ASASSN-18su looks likely a population II CV candidate." The current outburst was detected by Rod Stubbings at mv= 11.3 on 2022 June 28.537 UT (vsnet-outburst 28822, vsnet-alert 26852). It had already started on June 24 and is 1.5 magnitudes fainter than the 2018 outburst according to ASAS-SN Sky Patrol data: https://asas-sn.osu.edu/sky-patrol/coordinate/52d16cd1-3548-431f-a7fc-326e3… Time-resolved photometry is urgently 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

11 months

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[vsnet-campaign-dn 16458] QZ Vir (= T Leo) superoutburst (since June 21)

by Patrick Schmeer

QZ Virginis = T Leonis (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=17034 Outburst first detected on 2022 June 22.981 UT at V= 10.36 by Carlos Colesanti (CCT): https://app.aavso.org/webobs/results/?star=000-BBS-294 Observed on June 28.424 UT at mv= 10.4 by Rod Stubbings (vsnet-outburst 28822). Recent 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/sky-patrol/coordinate/c371f339-8e10-448c-98f5-e234f… The current superoutburst started on 2022 June 20 or 21. A normal outburst was observed from 2022 Jan. 31 to Feb. 3. Clear skies, Patrick

11 months

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[vsnet-campaign-dn 16457] TCP J22561804+4109534: new transient (mag. 14) in Lacerta

by Patrick Schmeer

TCP J22561804+4109534 (UG:) (submitted to VSX) RA 22h56m18.05s +41°09'54.3" (J2000.0, Pan-STARRS1) 2022 June 26.6897 UT, mag. 14.0 (CMOS camera, unfiltered) Discoverer: Yuji Nakamura (Kameyama, Mie, Japan) 2022 06 26.6897 UT Discovered by Yuji Nakamura, Kameyama, Mie, Japan, on two frames (30-s exp. limiting mag 16.0) taken by 10cm/F3.0 refractor and CMOS camera. Nothing is visible at this location on the frames taken on 2022 June 18.7097 UT (30-s exp. limiting mag 16.0) by same instrument. --- Isao Endoh (NAOJ) http://www.cbat.eps.harvard.edu/unconf/followups/J22561804+4109534.html 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/sky-patrol/coordinate/a342649c-16c0-43e6-86f6-933b9… TCPJ22561804+4109534 20220624.4688 <17.55g ASN TCPJ22561804+4109534 20220626.3301 14.70g ASN TCPJ22561804+4109534 20220626.3314 14.76g ASN TCPJ22561804+4109534 20220626.3326 14.74g ASN TCPJ22561804+4109534 20220626.3379 14.71g ASN TCPJ22561804+4109534 20220626.3391 14.72g ASN TCPJ22561804+4109534 20220626.3404 14.69g ASN Time-resolved and multiband (V, B, ...) photometry are required (spectroscopy is also encouraged). Clear skies, Patrick

11 months

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[vsnet-campaign-dn 16456] ASASSN-20pv bright again (AM CVn)

by Taichi Kato

ASASSN-20pv bright again (AM CVn) Brightening after fading following long standstill-like rebrightening. YYYYMMDD(UT) mag observer 20220528.506 148 (Rod Stubbings) 20220603.466 157 (Rod Stubbings) 20220621.426 143 (Rod Stubbings) 20220621.458 145 (Rod Stubbings)

11 months, 1 week

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[vsnet-campaign-dn 16455] Gaia22coq

by Taichi Kato

Gaia22coq http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia22coq/ Gaia22coq AT2022nbg 2022-06-18 14:45:10 331.72290 38.41940 17.55 unknown 2022-06-20 17:53:28 bright blue transient, rising fast

11 months, 1 week

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[vsnet-campaign-dn 16454] V418 Ser superoutburst continues (EI Psc star)

by Taichi Kato

V418 Ser superoutburst continues (EI Psc star) YYYYMMDD(UT) mag observer 20220601.5617 <155c (Yutaka Maeda) 20220603.449 150 (Rod Stubbings) 20220603.5563 158:c (Yutaka Maeda) 20220604.8875 154cG (Masao Funada) 20220606.5638 154:cG (Yutaka Maeda) 20220606.5638 154:cG (Yutaka Maeda) 20220608.5416 <152c (Yutaka Maeda) 20220608.5697 15.91C (Masayuki Moriyama) 20220616.1153 15.80C (Masao Funada) 20220617.6423 <148c (Yutaka Maeda)

11 months, 1 week

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[vsnet-campaign-dn 16453] MGAB-V300: rebrightening from a possible AM CVn star

by Taichi Kato

MGAB-V300: rebrightening from a possible AM CVn star Type from ZTF data. Rapid fading (2 mag/d) and rebrightening in the past data. YYYYMMDD(UT) mag observer 20220612.2432 14.06C (Masao Funada) 20220612.3877 14.328zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220614.3776 17.032zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220614.4204 17.024zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220615.163 <16.70C (Gary Poyner) 20220615.1640 <173C (Masao Funada) 20220617.715 16.45C (Hiroshi Itoh)

11 months, 1 week

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[vsnet-campaign-dn 16452] KLK-43 possible superoutburst

by Taichi Kato

KLK-43 possible superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20220601.3839 16.619zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220601.4591 16.455zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220605.4019 16.620zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220605.4425 16.718zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220607.4141 17.081zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220609.3992 17.148zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220611.4205 17.404zg (Zwicky Transient Facility Lasair (Masci+ 2019))

11 months, 1 week

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vsnet-campaign-dn June 2022