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

[vsnet-alert 26575] Re: TCP J14420760-1758238
by Taichi Kato 12 Feb '22

12 Feb '22

Re: TCP J14420760-1758238 Superoutburst reaching V=12.0 in 2001 in ASAS-3.

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[vsnet-alert 26574] TCP J14420760-1758238
by Naoto Kojiguchi 12 Feb '22

12 Feb '22

TCP J14420760-1758238 Large outburst amplitude of 7 mag. Possible possible WZ Sge star. TCP J14420760-1758238 2022 02 11.8211* 14 42 07.60 -17 58 23.8 12.2 U Lib 9 0 2022 02 11.821 Discovered by Tadashi Kojima, Tsumagoi,Gunma-ken, Japan, on three frames(5_s exp) under limiting mag.= 13.5 taken by Canon EOS 6D + 200mm f/3.2 lens. Nothing is visible at this location taken on 2022 Feb10.809 UT under limiting mag.= 13.8,with same instrument http://www.cbat.eps.harvard.edu/unconf/followups/J14420760-1758238.html ASASSN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/d7bb8ce8-8af3-4a96-9e65-41e8d… #r=3.5arcsec 144207.822 -175822.608 PS1_DR1_86432205326582816 g=19.0939(0.011) r=19.0499(0.0136) i=18.9061(0.0115) z=18.62(0.0168) y=18.3811(0.0458) 144207.897 -175823.563 GALEXJ144207.8-175823 FUV=20.349(0.2513) NUV=19.912(0.0981) 144207.859 -175823.036 Gaia_DR2_6285355265244126080 Plx=3.4238(0.3135) pmRA=-35.799(0.743) pmDE=28.756(0.552) G=18.8162(0.0080) BP-RP=0.4707 144207.860 -175823.027 Gaia_EDR3_6285355265244126080 Plx=3.4024(0.2229) PM=45.966 pmRA=-36.297(0.228) pmDE=28.203(0.204) G=18.697046 (0.013996) BP-RP=0.537893

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[vsnet-alert 26573] ASASSN-20pv: long rebrightening
by Taichi Kato 11 Feb '22

11 Feb '22

ASASSN-20pv: long rebrightening The object (AM CVn) is now entering a long (standstill-like) rebrightening as in the 2020-2021 superoutburst. The CCD observers are Berto Monard and Josch Hambsch.

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[vsnet-alert 26572] NSV 5031: updated period of superhumps
by Taichi Kato 11 Feb '22

11 Feb '22

NSV 5031: updated period of superhumps Based on the data by Berto Monard, Itoh-san and Josch Hambsch, the period of superhumps has been updated to 0.07505(1) d. Very clear superhumps.

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[vsnet-alert 26571] 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-alert 26570] 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-alert 26569] 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-alert 26568] more data of NSV 5031
by Berto Monard 10 Feb '22

10 Feb '22

Follow up observations of NSV 5031 at CBA KKO on the night 8-9 Feb yielded a mean mag of 13.84CR and clear superhumps with amplitudes around 0.26CR. A mean period of 0.0752d +/- 0.0002d was derived from the data over the two nights (7-9 feb). Berto Monard / KKO

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[vsnet-alert 26567] 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-alert 26566] 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-alert February 2022