August 2021 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 8691] Gaia21dzx
by Taichi Kato 31 Aug '21

31 Aug '21

Gaia21dzx Most likely a large-amplitude dwarf nova. http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21dzx/ Gaia21dzx AT2021xgr 2021-08-26 21:58:43 286.00866 -35.39330 15.00 unknown 2021-08-30 23:17:11 apparently hostless transient 190402.108 -352336.26 (2000.0) GALEX_DR5_6383934048320887191 NUV=20.335(0.149) FUV=19.657(0.107)

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[vsnet-newvar 8692] RX J0153.3+7446: VY Scl star
by Taichi Kato 31 Aug '21

31 Aug '21

RX J0153.3+7446: VY Scl star Deep fading since 2020 Oct. in ZTF data. Now around mag 19 or even fainter.

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[vsnet-newvar 8690] ASASSN-V J205543.90+240033.5: combination of three periods
by Taichi Kato 30 Aug '21

30 Aug '21

ASASSN-V J205543.90+240033.5: combination of three periods Josch Hambsch and Tonny Vanmunster have reported observations. See https://arxiv.org/abs/2108.09060 http://vsolj.cetus-net.org/vsoljno80.pdf "ASASSN-V J205543.90+240033.5: another white dwarf pulsar?" Their observations indicate that the global variation is a combination of the longer period 10.803 d and a shorter period 0.203424(1) d (determined from the ZTF data). These variations create the dispersion in figure 2 of the above paper. Their data also confirmed the short period of 0.0067876(7) d (amplitude 0.07 mag). This must be a very interesting CV-like object and further observations (including spectroscopy) are requested.

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[vsnet-newvar 8689] ASASSN-21qg: new SU UMa-type dwarf nova
by Taichi Kato 30 Aug '21

30 Aug '21

ASASSN-21qg: new SU UMa-type dwarf nova Berto Monard and Josch Hambsch have reported observations. This object shows superhumps with a period of 0.05539(5) d since Aug. 26.

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[vsnet-newvar 8688] TCP J19092450+3041330 = ZTF21abvytzx
by Naoto Kojiguchi 29 Aug '21

29 Aug '21

TCP J19092450+3041330 = ZTF21abvytzx Large outburst amplitude of 7 mag. Possible WZ Sge-type object. TCP J19092450+3041330 2021 08 29.6223* 19 09 24.50 +30 41 33.0 14.4 U Lyr 9 0 ZTF: ZTF21abvytzx 19:09:24.698 30:41:30.508 ASASSN: https://asas-sn.osu.edu/sky-patrol/coordinate/e17c057d-09dc-40f2-9a88-13c55… IDs: 190924.695 +304130.404 g=21.7602(0.0542) r=21.2643(0.1928) i=21.7743(0.0586) z=20.7550(0.1853) YYYYMMDD(UT) mag observer 20210826.170 <15.825g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20210828.212 16.851zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.280 16.701zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210829.240 14.532g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20210829.303 14.777cy (ATLAS Forced Photometry (Tonry et al. 2018, PASP 130, 0))

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[vsnet-newvar 8687] PNV J05393469+5715159 = ZTF21abuzuih: Possible WZ Sge-type object
by Naoto Kojiguchi 28 Aug '21

28 Aug '21

PNV J05393469+5715159 = ZTF21abuzuih: Possible WZ Sge-type object Large outburst amplitude of 8 mag. The fading rate is 0.15 mag/d. Possible WZ Sge-type object. PNV J05393469+5715159 2021 08 27.8730* 05 39 34.69 +57 15 15.9 13.57C Cam R - 2021 08 27.8730 Guoyou Sun (Xingming Observatory), Quanzhi Ye (Department of Astronomy, University of Maryland), Xing Gao (Xingming Observatory), report the discovery of a possible nova (13.57 C) which is 21.923 gmag in Pan-STARRS DR1 catalogue (PS1 objID 176700848943505888). The transient was discovered on several 60-s survey images (limiting mag about 19.0) taken Xing Gao by at Xingming Observatory-KATS, Nanshan (N86) around Aug. 27.87299, 2021 UT using a unfiltered CCD (0.28-m f/2.2 reflector). Images can be found at: http://xjltp.china-vo.org/XMK001.html TOCP: http://www.cbat.eps.harvard.edu/unconf/followups/J05393469+5715159.html Lasair: https://lasair.roe.ac.uk/object/ZTF21abuzuih/ ASASSN: https://asas-sn.osu.edu/sky-patrol/coordinate/d10ec2be-b6d8-4a54-b2da-67712… IDs: 053934.647 +571515.678 PS1_176700848943505888 g=21.9230(0.1727) r=21.6724(0.0988) i=-(-) z=-(-) y=-(-) 20210819.590 <17.788g ASN 20210822.589 19.422o ATF 20210824.444 13.912zg ZLR 20210825.585 13.973g ASN 20210827.447 14.363zg ZLR 20210827.487 14.386zr ZLR 20210827.581 14.436g ASN 20210827.873 13.57C (Xingming Observatory-KATS)

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[vsnet-newvar 8686]Gaia17bcx outburst
by Taichi Kato 27 Aug '21

27 Aug '21

Gaia17bcx outburst Relatively regular outbursts in the past ZTF data. Type not conclusive. YYYYMMDD(UT) mag observer 20210813.2639 20.441zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210820.2879 16.736zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210823.1819 16.064zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210823.2180 15.588zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-newvar 8685]CRTS J064804.5+414702 superoutburst
by Taichi Kato 27 Aug '21

27 Aug '21

CRTS J064804.5+414702 superoutburst YYYYMMDD(UT) mag observer 20210812.4971 18.805zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210812.5044 18.889zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.4860 16.310zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.4886 16.314zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.4911 16.353zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.4936 16.341zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.4962 16.331zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.4976 16.347zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.5000 16.321zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.5024 16.307zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.5048 16.263zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210817.5072 16.215zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.4863 16.495zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.4887 16.476zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.4912 16.449zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.4936 16.450zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.4960 16.401zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.4980 16.387zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.5003 16.364zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.5027 16.342zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.5051 16.330zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210818.5075 16.346zr (Zwicky Transient Facility Lasair (Masci+ 2019)) Also Gaia detection: http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21dyz/

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