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

[vsnet-campaign-dn 16238] ASASSN-22bs: possible early superhumps
by Taichi Kato 11 Feb '22

11 Feb '22

ASASSN-22bs: possible early superhumps The most recent data by Stephen Brincat and Josch Hambsch seem to show possible early superhumps, but the amplitude appears to be small. The signal was not very apparent in Monard's data. The large-amplitude variations (0.05 mag) recorded by T. Vanmunster on Feb. 8 were not periodic.

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[vsnet-campaign-dn 16237] Re: WY Tri possible superoutburst (since Feb. 7)
by Taichi Kato 10 Feb '22

10 Feb '22

Re: WY Tri possible superoutburst (since Feb. 7) This object is somewhat strange in that it never reached 13.8 mag as suggested by the discovery observation. 022500.475 +325955.55 (2000.0) Gaia_DR2_325028217130868480 plx=2.039(0.134) dismod=8.5 pmra=-7.760(0.281) pmdec=-17.451(0.205) G=17.633 BP=17.792 RP=17.181 022500.475 +325955.55 (2000.0) Gaia_EDR3_325028217130868480 plx=1.972(0.106) dismod=8.5 pmra=-8.005(0.107) pmdec=-17.648(0.106) G=17.522 BP=17.722 RP=17.085 With the distance modulus of 8.5, the peak apparent magnitude should be around 13. Known superoutbursts look too faint for a non-eclipsing system.

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[vsnet-campaign-dn 16236] NSV 5031: superhump period
by Taichi Kato 10 Feb '22

10 Feb '22

NSV 5031: superhump period Berto Monard and Itoh-san have reported observations. The superhump period is 0.07510(2) d.

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[vsnet-campaign-dn 16235] WY Tri possible superoutburst (since Feb. 7)
by Patrick Schmeer 10 Feb '22

10 Feb '22

WY Trianguli (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=36640 Y. Maeda wrote (vsnet-outburst 28323): TRIWY 20220208.4726968 150:c Mdy.VSOLJ outburst Complete ASAS-SN Sky Patrol light curve and data: https://asas-sn.osu.edu/sky-patrol/coordinate/2e05b260-9fa5-4782-8032-19791… ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF18abtgioa/ The current outburst started on 2022 February 7, and WY Tri was still at (orange) mag. 15.1 on Feb. 9.29 UT according to ATLAS forced photometry data. Time-resolved photometry is 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-campaign-dn 16234] DV TrA: new IW And star currently in standstill
by Taichi Kato 09 Feb '22

09 Feb '22

DV TrA: new IW And star currently in standstill As pointed by R. Stubbings (vsnet-outburst 28315), this object is currently in standstill. ASAS-SN data https://asas-sn.osu.edu/sky-patrol/coordinate/83d88502-9012-4cb2-bf79-f9ffb… show that this object is an IW And star (2021 Jan.-Mar. behavior). The current standstill is rising in brightness and an IW And-type outburst is expected.

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[vsnet-campaign-dn 16233] ASASSN-20pv: clear superhumps
by Taichi Kato 09 Feb '22

09 Feb '22

ASASSN-20pv: clear superhumps Berto Monard has reported further observations including the rebrightening phase. The analysis of the entire data yielded a period of 0.019106(1) d. The mean amplitude is 0.06 mag.

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[vsnet-campaign-dn 16231] ASASSN-22bs: likely dwarf nova outburst (mag. 12.2, in Canis Major)
by Patrick Schmeer 08 Feb '22

08 Feb '22

ASASSN-22bs (UG:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=2226032 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/2f8a4b69-9191-4256-a3ef-a8e9b… ASASSN-22bs 20220205.8444 <16.91g ASN ASASSN-22bs 20220208.2927 12.15g ASN Transient Name Server (TNS): https://www.wis-tns.org/object/2022bqs Outburst amplitude of more than 8.0 magnitudes. Time-resolved photometry is urgently required. Spectroscopy is also encouraged. Clear skies, Patrick

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[vsnet-campaign-dn 16229] NSV 5031: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 08 Feb '22

08 Feb '22

Dear colleagues, I have just finished analysing my unfiltered CCD observations of NSV 5031, obtained on 2022, February 07/08 at CBA Extremadura Observatory (Spain), using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. My observations were triggered by Rob Stubbings' vsnet-alert message 26557. Regular superhumps with an amplitude of 0.35 mag are very clearly visible in the resulting light curve, establishing NSV 5031 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 0.0764 +/- 0.0013d. The object was at mag CV = 14.1 on Feb 08th. 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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[vsnet-campaign-dn 16228] ASASSN-14fe superoutburst
by Taichi Kato 08 Feb '22

08 Feb '22

ASASSN-14fe superoutburst (Superhumps have not yet been detected) YYYYMMDD(UT) mag observer 20220130.485 140 (Rod Stubbings) 20220131.546 140 (Rod Stubbings) 20220202.1637 14.03C (Masao Funada) 20220202.544 145 (Rod Stubbings) 20220203.478 144 (Rod Stubbings) 20220204.544 143 (Rod Stubbings) 20220205.542 145 (Rod Stubbings) 20220206.544 147 (Rod Stubbings)

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[vsnet-campaign-dn 16227] NSV 5031 precursor and superoutburst
by Taichi Kato 08 Feb '22

08 Feb '22

NSV 5031 precursor and superoutburst Time-resolved observations are encourgaged. (Superhumps have not yet been detected). YYYYMMDD(UT) mag observer 20220202.578 <160 (Rod Stubbings) 20220203.574 138 (Rod Stubbings) 20220204.551 140 (Rod Stubbings) 20220205.1947 14.76C (Masao Funada) 20220205.558 147 (Rod Stubbings) 20220206.1081 16.06C (Masao Funada) 20220206.551 160 (Rod Stubbings) 20220207.526 134 (Rod Stubbings) location: 105749.916 -215658.74 (2000.0) Gaia_DR2_3549823111895468672 plx=1.522(0.150) dismod=9.1 pmra=6.517(0.240) pmdec=-15.902(0.210) G=17.958 BP=17.940 RP=17.394 105749.917 -215658.75 (2000.0) Gaia_EDR3_3549823111895468672 plx=1.596(0.079) dismod=9.0 pmra=6.694(0.117) pmdec=-15.865(0.100) G=17.822 BP=17.959 RP=17.301 105749.887 -215658.52 (2000.0) GALEX_DR5_6382315538213766389 NUV=18.979(0.077) FUV=19.093(0.117)

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vsnet-campaign-dn February 2022