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

[vsnet-campaign-dn 17097] V1251 Cyg outburst (first since 2008)
by Taichi Kato 29 Mar '23

29 Mar '23

V1251 Cyg outburst (first since 2008) This is obviously an alert matter. YYYYMMDD(UT) mag observer 20230314.8506 <166C (Masayuki Moriyama) 20230318.8577 <155C (Masayuki Moriyama) 20230319.8561 <162C (Masayuki Moriyama) 20230327.8551 <159C (Masayuki Moriyama) 20230328.7938 14.29C (Masayuki Moriyama) Last superoutburst in 2008 and earlier ones in 1994 and 1997. Considering a supercycle of 11 years, the next superoutburst is overdue. The current outburst was detected early and time-resolved photometry is very desirable. This object is a long-Porb WZ Sge star and early superhumps were visible in the earliest state of a superoutburst.

1 0

[vsnet-campaign-dn 17096] V793 Ara: dwarf nova
by Taichi Kato 28 Mar '23

28 Mar '23

V793 Ara: dwarf nova From ATLAS data. Light curve is relatively regular and an SU UMa star cannot be excluded. Cycle of bright outburst about 80 d. Next long one is expected in late May. Bright object (above 15 mag at peak).

1 0

[vsnet-campaign-dn 17095] Re: TCPJ06461075+2502415 brightening!
by Taichi Kato 28 Mar '23

28 Mar '23

Re: TCPJ06461075+2502415 brightening! > Sano-san has reported that this object brightened above > 15 mag and was apparently still brightening on Mar. 27. This turned out to be an error.

1 0

[vsnet-campaign-dn 17094] ASASSN-23bx: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 28 Mar '23

28 Mar '23

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-23bx, obtained on 2023, Mar 27/28 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. The resulting light curve clearly shows the presence of regular superhumps with a large amplitude of 0.58 mag, establishing ASASSN-23bx as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and Conditional Entropy methods (Peranso 3.0) yields a combined superhump period of 0.0589 +/- 0.0005d. The object was at mag CV = 16.5 on Mar 28th. 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> http://www.cbabelgium.com PERANSO: The Light Curve and Period Analysis Software http://www.peranso.com

1 0

[vsnet-campaign-dn 17093] TCPJ06461075+2502415 brightening!
by Taichi Kato 28 Mar '23

28 Mar '23

TCPJ06461075+2502415 brightening! Sano-san has reported that this object brightened above 15 mag and was apparently still brightening on Mar. 27. YYYYMMDD(UT) mag observer 20230327.4423 15.495B (Yasuo Sano) 20230327.4448 14.964V (Yasuo Sano) 20230327.4473 14.447Rc (Yasuo Sano) 20230327.4493 14.863C (Yasuo Sano) Time-resolved data did not show apparent superhumps reported by Vanmunster on Mar. 24. Such behavior is not expected in a WZ Sge after appearance of ordinary superhumps. Please continue your observations!

1 0

[vsnet-campaign-dn 17092] MASTER OT J174816.22+501723.3 likely superoutburst
by Taichi Kato 27 Mar '23

27 Mar '23

MASTER OT J174816.22+501723.3 likely superoutburst YYYYMMDD(UT) mag observer 20230316.6432 19.087o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.5546 16.551o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.5737 16.919o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.5755 16.475o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230320.5845 16.346o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.5974 15.925o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.6220 15.853o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.6244 15.879o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.6280 15.814o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.6285 15.943o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.6333 15.985o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.6346 15.971o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.6437 15.973o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

1 0

[vsnet-campaign-dn 17091] ASASSN-14gu standstill?
by Taichi Kato 27 Mar '23

27 Mar '23

ASASSN-14gu standstill? YYYYMMDD(UT) mag observer 20230308.549 164C (Mitsutaka Hiraga) 20230310.2587 16.373zg (ZTF Alert DC mag (Masci+ 2019)) 20230310.5488 <155c (Yutaka Maeda) 20230313.5732 <164c (Yutaka Maeda) 20230313.6686 161C (Masayuki Moriyama) 20230314.5436 160:c (Yutaka Maeda) 20230314.6021 162C (Masayuki Moriyama) 20230315.5593 156c (Yutaka Maeda) 20230315.5593 156c (Yutaka Maeda) 20230317.1558 15.991zg (ZTF Alert DC mag (Masci+ 2019)) 20230317.2775 15.997zr (ZTF Alert DC mag (Masci+ 2019)) 20230318.6317 161C (Masayuki Moriyama) 20230319.5777 158:C (Masayuki Moriyama) Another likely standstill with IW And-type ending: YYYYMMDD(UT) mag observer 20221218.7773 161C (Masayuki Moriyama) 20221219.3434 16.103zr (Zwicky Transient Facility (Masci et al., 2019)) 20221219.4481 16.103zg (Zwicky Transient Facility (Masci et al., 2019)) 20221220.6296 <150c (Yutaka Maeda) 20221221.3447 16.067zr (Zwicky Transient Facility (Masci et al., 2019)) 20221221.4050 16.049zg (Zwicky Transient Facility (Masci et al., 2019)) 20221223.2760 16.101zr (Zwicky Transient Facility (Masci et al., 2019)) 20221223.3294 16.039zg (ZTF Alert DC mag (Masci+ 2019)) 20221223.3294 16.046zg (Zwicky Transient Facility (Masci et al., 2019)) 20221225.6126 <154c (Yutaka Maeda) 20221227.2810 15.374zg (ZTF Alert DC mag (Masci+ 2019)) 20221227.2810 15.435zg (Zwicky Transient Facility (Masci et al., 2019)) 20221227.3292 15.253zr (ZTF Alert DC mag (Masci+ 2019)) 20221227.3292 15.444zr (Zwicky Transient Facility (Masci et al., 2019)) 20221227.6888 156C (Masayuki Moriyama) 20221227.7589 155:c (Yutaka Maeda)

1 0

[vsnet-campaign-dn 17090] ASASSN-15na: missed superoutburst in 2019
by Taichi Kato 27 Mar '23

27 Mar '23

ASASSN-15na: missed superoutburst in 2019 (WZ Sge) Only the peak is shown. YYYYMMDD(UT) mag observer 20190627.4400 15.598c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20190627.4410 15.527c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20190627.4478 15.553c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20190627.4483 15.568c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20190627.4510 15.537c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20190627.4515 15.621c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20190627.4611 15.468c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20190627.4615 15.522c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

1 0

[vsnet-campaign-dn 17089] ASASSN-15nz: SU UMa star
by Taichi Kato 27 Mar '23

27 Mar '23

ASASSN-15nz: SU UMa star ATLAS detected superhumps during the 2022 Apr. outburst.

1 0

[vsnet-campaign-dn 17088] NSV11274: SS Cyg star
by Taichi Kato 27 Mar '23

27 Mar '23

NSV11274: SS Cyg star From ATLAS data. Range 14.0-17.5. Frequent outbursts. 184522.016 -462528.38 (2000.0) Gaia_DR2_6705536352519862144 plx=1.172(0.056) dismod=9.7 pmra=7.315(0.074) pmdec=-9.845(0.068) G=14.447 BP=14.318 RP=14.214 184522.016 -462528.38 (2000.0) Gaia_EDR3_6705536352519862144 plx=1.140(0.034) dismod=9.7 pmra=7.403(0.025) pmdec=-9.727(0.023) G=15.027 BP=15.141 RP=14.758 184522.012 -462527.32 (2000.0) GALEX_DR5_6383969183300850802 NUV=15.027(0.007) FUV=15.062(0.012)

1 0