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

[vsnet-alert 26464] Gaia21fcw fading
by Taichi Kato 27 Nov '21

27 Nov '21

Gaia21fcw fading SS Cyg star with a long orbital period? YYYYMMDD(UT) mag observer 20211104.2462 17.410zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211104.2471 17.423zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.1553 17.284zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.3030 17.231zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211106.3035 17.230zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.2198 16.561zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.2203 16.547zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211108.2238 16.535zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.2421 16.036zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.2426 16.020zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.2585 16.045zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211113.9181 15.25C (Masao Funada) 20211114.5755 151C (Masayuki Moriyama) 20211115.6456 147C (Masayuki Moriyama) 20211116.6623 15.06C (Masayuki Moriyama) 20211126.6568 163:C (Masayuki Moriyama)

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[vsnet-alert 26463] KL Dra superoutburst?
by Taichi Kato 27 Nov '21

27 Nov '21

KL Dra superoutburst? (AM CVn) YYYYMMDD(UT) mag observer 20211108.1998 18.610zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211111.1165 18.885zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211113.1983 18.247zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211115.5638 <157C (Masayuki Moriyama) 20211119.1778 16.237zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211125.1124 16.669zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211126.5770 153C (Masayuki Moriyama)

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[vsnet-alert 26462] V1006 Cyg slowly rising outburst
by Taichi Kato 27 Nov '21

27 Nov '21

V1006 Cyg slowly rising outburst SU UMa star. YYYYMMDD(UT) mag observer 20211118.4028 <160c (Yutaka Maeda) 20211119.1576 16.070zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211119.4024 <162cG (Yutaka Maeda) 20211122.1177 17.895zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211122.1182 17.913zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211122.6191 <154C (Masayuki Moriyama) 20211125.5900 151C (Masayuki Moriyama) 20211126.5970 140C (Masayuki Moriyama)

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[vsnet-alert 26461] CRTS J231552.3+271037 likely superoutburst
by Taichi Kato 27 Nov '21

27 Nov '21

CRTS J231552.3+271037 likely superoutburst Tyoe from ZTF data. YYYYMMDD(UT) mag observer 20211122.2023 15.255zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211125.6384 15.34C (Masayuki Moriyama) 20211126.6484 157C (Masayuki Moriyama)

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[vsnet-alert 26460] TCP J20441708-2037591
by Taichi Kato 25 Nov '21

25 Nov '21

TCP J20441708-2037591 see http://cbat.eps.harvard.edu/unconf/followups/J20441708-2037591.html Discovered by Tadashi Kojima V=12.5 on Nov. 25 204417.241 -203801.61 (2000.0) Gaia_DR2_6857113204452224512 plx=3.459(1.629) dismod=7.3 pmra=-10.225(2.117) pmdec=-20.743(0.961) G=19.746 BP=19.447 RP=19.339 204417.241 -203801.63 (2000.0) Gaia_EDR3_6857113200158102528 plx=2.674(0.576) dismod=7.9 pmra=-10.198(0.607) pmdec=-19.955(0.376) G=19.644 BP=19.578 RP=19.504 204417.247 -203801.30 (2000.0) GALEX_DR5_6379817435984299663 NUV=19.459(0.065) FUV=19.258(0.091) No outburst in ASAS-3.

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[vsnet-alert 26389] Rybka 2: eclipsing SU UMa-type dwarf nova
by Denis Denisenko 24 Nov '21

24 Nov '21

This dwarf nova in Lacerta was discovered by 9th-grade student Alexandra Rybka in November 2020 while data mining from the URAT1 catalog (due to outburst at Epoch 2013.708). It was also in outburst on 1989-09-03 DSS red plate and on several PanSTARRS-1 images. AAVSO VSX entry: https://www.aavso.org/vsx/index.php?view=detail.top&oid=2214231 According to ATLAS data (Tonry et al., 2018) the latest superoutburst started on 2021 October 20th and peaked at 16.6o on Oct. 21st. Light curve from ATLAS forced photometry server in orange and cyan filters: http://scan.sai.msu.ru/~denis/Rybka2-ATLAS-LC.gif During the outbursts this variable is showing the eclipses as deep as 2 magnitudes. See, for example, the light curve of October 2019 outburst from ZTF data (Masci et al., 2018): http://scan.sai.msu.ru/~denis/Rybka2-ZTF-Oct2019.gif Using the combined ATLAS and ZTF data from four outbursts, I have found the best value of period to be P=0.0819486 d (118.006 minutes) and the epoch of mid-eclipse MJD=59513.379. After the linear detrending of outbursts (some for 0.15 mag/day, one for 0.12, the other for 0.10 mag/day) the following phased light curve was obtained: http://scan.sai.msu.ru/~denis/Rybka2-phased_LC.gif Denis Denisenko

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[vsnet-alert 26458] CS Ind superoutburst
by Taichi Kato 24 Nov '21

24 Nov '21

CS Ind superoutburst YYYYMMDD(UT) mag observer 20211105.442 168 (Rod Stubbings) 20211108.442 170 (Rod Stubbings) 20211120.457 120 (Rod Stubbings) 20211121.506 120 (Rod Stubbings) 20211122.2364 12.05C (Masao Funada)

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[vsnet-alert 26457] ASASSN-21uy: superhump period
by Taichi Kato 21 Nov '21

21 Nov '21

ASASSN-21uy: superhump period Josch Hambsch has reported further observations. The superhump period is 0.06057(4) d. The profile is still doubly humped with the second maximum fainter.

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[vsnet-alert 26456] ASASSN-21uw: new SU UMa-type dwarf nova
by Taichi Kato 21 Nov '21

21 Nov '21

ASASSN-21uw: new SU UMa-type dwarf nova Josch Hambsch and Berto Monard have reported observations. Superhumps started to appear on Nov. 20 and the current period is 0.0557(1) d (probably stage A).

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[vsnet-alert 26455] AR Pic superoutburst
by Taichi Kato 21 Nov '21

21 Nov '21

AR Pic superoutburst YYYYMMDD(UT) mag observer 20211117.476 129 (Rod Stubbings) 20211120.472 126 (Rod Stubbings)

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