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

[vsnet-alert 26774] ASASSN-22gm: superhumps (AM CVn)
by Taichi Kato 12 May '22

12 May '22

ASASSN-22gm: superhumps (AM CVn) Josch Hambsch has reported further observations. The data show 0.2-mag superhumps with a period of 0.0291(2) d. Further observations are strongly encouraged.

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[vsnet-alert 26773] Fading of BC UMa
by Filipp Romanov 11 May '22

11 May '22

I reported my time series observations of BC UMa from images taken remotely using 0.355-m f/6.2 Schmidt-Cassegrain telescope of Abbey Ridge Observatory (Canada): May 6, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95143 May 7, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95148 May 10, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95162 May 11, 2022: http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-obs/95167 I detected the superhumps and noticed that BC UMa is fades rapidly: 2022-05-06 02:53 UT 13.616 CV +/- 0.002 2022-05-07 02:01 UT 13.804 CV +/- 0.002 2022-05-10 02:21 UT 14.853 CV +/- 0.009 2022-05-11 02:59 UT 16.607 CV +/- 0.028 With best regards, Filipp Romanov.

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[vsnet-alert 26772] ASASSN-22gr
by Taichi Kato 11 May '22

11 May '22

ASASSN-22gr ASASSN-22gr --- ------- 15:49:8.51 -62:8:20.1 2022-05-9.24 14.57 SDSS DSS VIZIER ------- CV candidate, matches to GAIA DR2 G=20.5, g>18.3 on 2022-05-01.09, g=17.3 on 2022-05-02.18, g=14.9 on 2022-05-09.23, g=15.2 on 2022-05-10.26 ASASSN-22gr 20220501.09 <183g ASN ASASSN-22gr 20220502.18 173g ASN ASASSN-22gr 20220509.23 149g ASN ASASSN-22gr 20220510.26 152g ASN

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[vsnet-alert 26770] TCP J14225968+4122545: possible WZ Sge-type dwarf nova
by Naoto Kojiguchi 11 May '22

11 May '22

TCP J14225968+4122545: possible WZ Sge-type dwarf nova Large amplitude outburst of 8 mag. Possible WZ Sge-type dwarf nova. CBAT: TCP J14225968+4122545 2022 05 09.8119* 14 22 59.68 +41 22 54.5 12.8 C Boo R 9 2022 05 09.8119 Hanjie Tan (AUUK), Mi Zhang, Jiangao Ruan, Guoyou Sun, Jingyuan Zhao (Xingming Obs), Quanzhi Ye (UMd), Xing Gao (Xingming Obs), report the discovery of an UG candidate (12.8 CV) on several 60-s survey images (limit mag about 18.5 CV) taken by Xing Gao at Xingming Observatory “#”3 (N88) around 2022 May. 09.81186 UTC using unfiltered CCD and PAT telescope (0.3-m f/3.6 reflector). The source is approximately located at RA= 14h22m59.68s,DEC = +41d22m54.5s (equinox 2000.0), appears to correspond to object Gaia EDR3 1491978283221972224 (G=20.87) in the Gaia EDR3. Details can be found at: http://xjltp.china-vo.org/xm116ht.html http://www.cbat.eps.harvard.edu/unconf/followups/J14225968+4122545.html IDs: 142259.693 +412254.310 Gaia_DR2_1491978283221972224 Plx=1.6097(1.3294) dismod=9.0 pmRA=-6.119(2.076) pmDE=-8.789(1.912) G=20.9233(0.0154) BP-RP=0.4118 E(g-r)=0.000 E(B-V)=0.000 Ag=0.000 Ar=0.000 Ai=0.000 142259.702 +412254.455 Gaia_EDR3_1491978283221972224 Plx=1.8528(1.219) dismod=8.7 PM=11.437 pmRA=-6.603(1.48) pmDE=-9.338(1.769) G=20.8731(0.011757) BP-RP=0.258472 E(g-r)=0.000 E(B-V)=0.000 Ag=0.000 Ar=0.000 Ai=0.000 142259.692 +412254.323 PS1_DR1_157652157486948733 g=20.862(0.0386) r=20.8495(0.0349) i=21.0795(0.0404) z=21.1269(0.0794) y=--(--) 142259.704 +412254.404 PS1_DR2_157652157486948733 g=20.8563(0.02203) r=20.9597(0.024062) i=21.1843(0.021126) z=21.2248(0.051955) y=21.5224(0.1888) 142259.699 +412254.494 SDSSJ142259.69+412254.4 ObsDate=2003.2259 u=20.872(20.872) g=20.857(0.031) r=20.912(0.047) i=21.115(0.073) z=21.516(0.361) 142259.682 +412254.998 GALEXJ142259.6+412254 FUV=--(--) NUV=21.3308(0.2836) MPChecker: NO DATA ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/a33d3ec9-ee1b-4d51-9803-72930… TCPJ14225968+4122545 20220418.411 19.218o ATF TCPJ14225968+4122545 20220421.164 <17.771g ASN TCPJ14225968+4122545 20220422.146 <17.732g ASN TCPJ14225968+4122545 20220506.112 <16.962g ASN TCPJ14225968+4122545 20220508.115 <16.939g ASN TCPJ14225968+4122545 20220509.812 12.8C (Xingming Observatory) TCPJ14225968+4122545 20220510.378 13.651o ATF

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[vsnet-alert 26764] Re: PR Her
by Patrick Schmeer 10 May '22

10 May '22

PR Herculis (UGWZ) https://www.aavso.org/vsx/index.php?view=detail.top&oid=15127 PR Her was fainter than mag. 16 on 2022 May 8.38 UT according to recent ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data: https://asas-sn.osu.edu/sky-patrol/coordinate/6c10f9f0-10b3-4980-a70c-00627… Further observations are encouraged. Clear skies, Patrick ------- Gary Poyner wrote on Sunday, 8 May 2022 at 15:16:59 UTC: Jose Ripero has reported (on vsobs share, May 7) that the UGWZ star PR Her is in outburst. HERPR 20220507.9597 13.6 OJR Active Since its discovery in 1951 by Hoffmeister (from a photographic plate) the only major outburst to have been covered well occurred in November 2011. Since then there have been several faint detections (below mag 15) reported to the AAVSO database (the last one being in June 2020 at 16.7V by Roger Pickard). The quiescent magnitude is around 21.0. Confirmation is urgently requested. Gary ------------------------------------------------------ Gary Poyner FRAS garypoyner(a)gmail.com www.variablestars.co.uk

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[vsnet-alert 26768] ASASSN-22go
by Taichi Kato 10 May '22

10 May '22

ASASSN-22go ASASSN-22go --- ------- 11:55:6.56 -70:40:39.3 2022-05-7.04 14.55 SDSS DSS VIZIER ------- CV candidate, no Vizier match, g>18.3 on 2022-05-05.17, g=15.0 on 2022-05-07.00, g=15.4 on 2022-05-09.07, g=15.6 on 2022-05-09.17 ASASSN-22go 20220505.17 <183g ASN ASASSN-22go 20220507.00 150g ASN ASASSN-22go 20220509.07 154g ASN ASASSN-22go 20220509.17 156g ASN

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[vsnet-alert 26767] ASASSN-20pv: second post-superoutburst plateau (AM CVn)
by Taichi Kato 10 May '22

10 May '22

ASASSN-20pv: second post-superoutburst plateau (AM CVn) YYYYMMDD(UT) mag observer 20220415.1853 15.146g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.1866 15.245g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220415.1878 15.577g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220416.1989 15.410g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220416.2002 15.597g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220416.2015 15.608g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220416.2296 <15.511g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220416.2309 <15.407g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220416.2321 15.514g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220417.2074 15.008g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220417.2086 15.025g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220417.2099 14.961g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.2103 <15.464g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.2116 <15.593g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220418.2128 14.921g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.0026 14.835g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.0038 15.042g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2409 15.492g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2422 15.322g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.2436 15.395g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220422.606 143 (Rod Stubbings) 20220423.2442 15.314g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2455 15.455g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220423.2468 15.419g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.2435 15.497g (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) 20220424.592 144 (Rod Stubbings) 20220425.376 154 (Rod Stubbings) 20220425.592 143 (Rod Stubbings) 20220425.624 144 (Rod Stubbings) 20220428.560 143 (Rod Stubbings) 20220502.610 143 (Rod Stubbings) 20220502.682 143 (Rod Stubbings) 20220503.591 143 (Rod Stubbings) 20220505.562 143 (Rod Stubbings) 20220505.635 144 (Rod Stubbings) 20220505.701 144 (Rod Stubbings) 20220509.599 144 (Rod Stubbings)

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[vsnet-alert 26766] ASASSN-22gb: stage A superhumps
by Taichi Kato 09 May '22

09 May '22

ASASSN-22gb: stage A superhumps Berto Monard and Josch Hambsch have reported further observations. The amplitudes of superhumps have been growing and the maxima were expressed by 0.05442(5) d (stage A superhumps). The long duration of stage A suggests a relatively small q.

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[vsnet-alert 26765] ASASSN-22gm: eclipsing AM CVn star
by Taichi Kato 09 May '22

09 May '22

ASASSN-22gm: eclipsing AM CVn star Berto Monard has reported observations. I obtained the following ephemeris (single night): BJD(Min) = 2459705.53602(7) + 0.02890(3) E Eclipse depth 0.26 mag. No superhumps were detected. The orbital profile is somewhat strange in that it showed two maxima in one orbital cycle. They might be (super)hump-like variations with a period of the orbital period. The object is most likely an eclipsing AM CVn star with infrequent outbursts. Further observations are needed to see whether this was a precursor or an isolated normal outburst.

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[vsnet-alert 26763] V610 Her likely superoutburst
by Taichi Kato 08 May '22

08 May '22

V610 Her likely superoutburst YYYYMMDD(UT) mag observer 20220501.3925 20.099zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220501.3930 20.843zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220503.3312 17.722zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220503.3999 17.464zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220503.4162 17.336zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220503.4452 17.168zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220507.1413 164cG (Masao Funada)

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vsnet-alert May 2022