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

[vsnet-alert 26214] OT J231110.9+013003 likely superoutburst
by Taichi Kato 08 Sep '21

08 Sep '21

OT J231110.9+013003 likely superoutburst Long-lasting and slowly fading outburst. Large outburst amplitude. Time-resolved photometry is encouraged. YYYYMMDD(UT) mag observer 20210803.6893 <157c (Yutaka Maeda) 20210805.7608 <166c (Yutaka Maeda) 20210827.8169 142cG (Yutaka Maeda) 20210828.3387 14.899zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.3673 14.559zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.5598 143cG (Yutaka Maeda) 20210829.2823 14.987zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.3153 15.355zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.3738 15.604zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210906.2940 15.639zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210906.3376 15.494zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210907.2633 15.547zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26213] SDSS J172102.48+273301.2 (AM CVn) dip after short superoutburst
by Taichi Kato 08 Sep '21

08 Sep '21

SDSS J172102.48+273301.2 (AM CVn) dip after short superoutburst YYYYMMDD(UT) mag observer 20210831.2081 19.372zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210903.2167 16.261zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.2264 16.557zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.2765 16.267zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210907.1802 18.617zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26212] MGAB-V258 possible superoutburst
by Taichi Kato 08 Sep '21

08 Sep '21

MGAB-V258 possible superoutburst YYYYMMDD(UT) mag observer 20210823.4701 19.445zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210825.4670 20.335zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210827.4496 20.419zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210827.4498 20.419zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210902.4561 17.734zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210902.4838 17.537zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210904.4502 17.657zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210904.4504 17.657zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26211] ASASSN-18hr likely superoutburst
by Taichi Kato 08 Sep '21

08 Sep '21

ASASSN-18hr likely superoutburst Suspected ER UMa star. YYYYMMDD(UT) mag observer 20210821.2250 18.820zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210821.3013 18.577zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210824.2447 16.184zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210824.3044 16.310zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210826.2604 16.232zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210826.2979 16.199zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.2131 16.321zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.2630 16.681zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210901.2677 16.462zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210903.2863 16.769zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.2440 17.136zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.2575 16.901zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-alert 26210] Re: ASASSN-21nv: at least four rebrightenings
by Taichi Kato 07 Sep '21

07 Sep '21

Re: ASASSN-21nv: at least four rebrightenings > The (super?)outburst started on 2021 July 27. A rapid fading began on August 23. > Short rebrightenings were recorded on August 27 and 30, and on September 2 and 4. > (according to ZTF, ATLAS and ASAS-SN data) Look like a short rebrightening and a long one (according to ZTF Lasair). ASAS-SN data are noisy (fainter thans around positive detections).

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[vsnet-alert 26209] ASASSN-21nv: at least four rebrightenings
by Patrick Schmeer 07 Sep '21

07 Sep '21

ASASSN-21nv (UGWZ:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=2223860 ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF21abouwjj/ Recent ASAS-SN Sky Patrol light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/dc7c9a1a-df53-4dd2-8866-99e32… The (super?)outburst started on 2021 July 27. A rapid fading began on August 23. Short rebrightenings were recorded on August 27 and 30, and on September 2 and 4. (according to ZTF, ATLAS and ASAS-SN data) Time-resolved photometry was performed by Tonny Vanmunster (VMT) during six observing sessions (July 30 - Aug. 3 and Aug. 10 UT); no superhumps were detected: https://app.aavso.org/webobs/results/?star=ASASSN-21nv Follow-up observations are 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 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

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[vsnet-alert 26207] MASTER OT J052622.61+734629.7: new SU UMa-type dwarf nova
by Taichi Kato 06 Sep '21

06 Sep '21

MASTER OT J052622.61+734629.7: new SU UMa-type dwarf nova Tamas Tordai and Josch Hambsch have reported observations. The object shows superhumps with a period of 0.06549(4) d and an amplitude of 0.28 mag.

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[vsnet-alert 26206] ASASSN-V J205543.90+240033.5: true period
by Taichi Kato 06 Sep '21

06 Sep '21

ASASSN-V J205543.90+240033.5 (AR Sco-like object): true period After an analysis of the ZTF data, I reached a conclusion that the true period is 0.523490(1) d. All the data can be well expressed by this period and the profile is sinusoidal (reflection type). The 10.803 d period I reported appears to be its alias. The initially reported 0.2-d period was caused by the incomplete phase coverage. Now this object looks even more similar to AR Sco (Porb=0.14853528 d, spin=1.95 min). I will publish a corrected report shortly. Special thanks to Elena Pavlenko for pointing out the likely error in the period.

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[vsnet-alert 26205] ASASSN-21qi: new SU UMa-type dwarf nova
by Taichi Kato 06 Sep '21

06 Sep '21

ASASSN-21qi: new SU UMa-type dwarf nova Berto Monard has reported observations. The object has been showing superhump (amplitude 0.18 mag) since Aug. 26. The period is 0.06141(2) d allowing aliases (alias still not selected due to the limited coverage).

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[vsnet-alert 26204] TCP J19092450+3041330: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 06 Sep '21

06 Sep '21

Dear colleagues, I have just finished analysing my unfiltered observations of TCP J19092450+3041330, obtained on 2021, September 04/05 at CBA Belgium Observatory (0.40-m f/10.0 telescope, QHY-268M CMOS, clear then clouds) and at CBA Extremadura Observatory (0.40-m f/5.1 telescope, SX-46 CCD, clear skies). Combining both observation sets, regular superhumps with an amplitude of 0.40 mag are clearly visible in the resulting light curve, establishing TCP J19092450+3041330 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 superhump period of 0.0680 +/- 0.0002d. The object was at mag CV = 16.1 on Sep 05th. 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

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