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

[vsnet-newvar 8916] CRTS J043112.4-031452 outburst
by Taichi Kato 24 Oct '21

24 Oct '21

CRTS J043112.4-031452 outburst Eclipsing SU UMa star. YYYYMMDD(UT) mag observer 20210918.3238 <166C (Masao Funada) 20211009.2245 178cG (Masao Funada) 20211022.3397 15.806zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211022.3946 15.685zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-newvar 8915] CRTS J172929.1+201808 possible superoutburst
by Taichi Kato 24 Oct '21

24 Oct '21

CRTS J172929.1+201808 possible superoutburst Type from ZTF data. YYYYMMDD(UT) mag observer 20211023.1556 16.970zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-newvar 8914] ASASSN-19ty likely superoutburst
by Taichi Kato 24 Oct '21

24 Oct '21

ASASSN-19ty likely superoutburst Type from ZTF data. Time-resolved observations are encouraged. YYYYMMDD(UT) mag observer 20211023.1927 15.353zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-newvar 8913] 1RXS J174726.1-300138 = Gaia21eso outburst
by Taichi Kato 22 Oct '21

22 Oct '21

1RXS J174726.1-300138 = Gaia21eso outburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21eso/ Gaia21eso AT2021abxc 2021-10-15 03:44:16 266.85507 -30.03785 18.75 20.42 0.54 unknown 2021-10-21 12:28:55 ~2 mag outburst in Gaia source near Galactic centre, previous event seen Also known as LMXB 1744-300.

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[vsnet-newvar 8912] ASASSN-21tp
by Taichi Kato 22 Oct '21

22 Oct '21

ASASSN-21tp ASASSN-21tp --- ------- 8:46:11.18 -47:28:14.3 2021-10-21.33 13.84 SDSS DSS VIZIER ------- outburst from a previously non-variable star, matches to GAIA DR2 G=13.6, The ASAS-SN light curve for the last 300 days, the big spikes near g=12 are data artifacts. Very unusual object. Basic data: 2MASS 084611.130 -472813.69 (2000.0) 12.322 12.041 11.995 084611.124 -472813.65 (2000.0) Gaia_DR2_5329521945789287040 plx=0.964(0.015) dismod=10.1 pmra=-5.781(0.028) pmdec=9.573(0.027) G=13.602 BP=13.987 RP=13.045 084611.123 -472813.65 (2000.0) Gaia_EDR3_5329521945789287040 plx=0.986(0.011) dismod=10.0 pmra=-5.743(0.013) pmdec=9.598(0.013) G=13.593 BP=13.971 RP=13.034 No "outburst" in ASAS-3. ASAS-SN data suggest 5-d period during the current brightening. This reminds me of ASASSN-21gk and ASASSN-20da, which may represent a new type of variable stars (ATel 14593).

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[vsnet-newvar 8911] ASASSN-21tr
by Taichi Kato 22 Oct '21

22 Oct '21

ASASSN-21tr Large outburst amplitude. ASASSN-21tr --- ------- 7:53:30.48 66:29:23.7 2021-10-21.36 14.56 SDSS DSS VIZIER ------- CV candidate, matches to SDSS g=22.2, g>17.3 on 2021-10-19.49, g=14.9 on 2021-10-21.36 ASASSN-21tr 20211019.49 <173g ASN ASASSN-21tr 20211021.36 149g ASN

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[vsnet-newvar 8910] 1RXS J063214.8+253620
by Taichi Kato 22 Oct '21

22 Oct '21

1RXS J063214.8+253620 This object is a long-period SS Cyg star and does not require special time-resolved photometry. Using ZTF data, I obtained an orbital period of 0.324254(3) d (in agreement with Armstrong et al. 2016 using K2 data). The profile is double wave (ellipsoidal variation) + orbital hump, as expected for a low-Mdot SS Cyg star.

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[vsnet-newvar 8909] MASTER OT J211656.91-432501.4: new SU UMa-type dwarf nova
by Taichi Kato 22 Oct '21

22 Oct '21

MASTER OT J211656.91-432501.4: new SU UMa-type dwarf nova Berto Monard reported observations. On Oct. 10, the object showed 0.3-mag superhumps. The period was about 0.06 d.

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[vsnet-newvar 8908] Gaia19cws most likely superoutburst
by Taichi Kato 21 Oct '21

21 Oct '21

Gaia19cws most likely superoutburst Most likely SU UMa star with a short supercycle 140 d (from ZTF data). YYYYMMDD(UT) mag observer 20210927.3499 19.481zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210927.3924 20.037zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.2996 19.794zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210929.3377 19.572zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211010.3902 17.149zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211014.4368 17.500zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-newvar 8907] XM78HT: period of early superhumps
by Taichi Kato 21 Oct '21

21 Oct '21

XM78HT: period of early superhumps Tonny Vanmunster and Itoh-san have reported observations. The amplitudes of early superhumps have decreased. The mean period up to now is 0.05413(6) d.

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vsnet-newvar October 2021