September 2021 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 15998] Gaia17asx possible superoutburst
by Taichi Kato 18 Sep '21

18 Sep '21

Gaia17asx possible superoutburst Type from ZTF data. There was an outburst in 2021 June (normal). The next superoutburst is overdue and the current one is expected to be s super. YYYYMMDD(UT) mag observer 20210901.2764 21.222zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210903.3009 22.190zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210905.3053 21.613zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210909.3198 21.586zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210916.2764 16.713zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-campaign-dn 15997] LL And: emerging superhumps?
by Taichi Kato 17 Sep '21

17 Sep '21

LL And: emerging superhumps? Crimean Astrophys. Obs. team and Kiyota-san reported observations. (Tonny Vanmunster has sent a run, but it is not processed yet. This set will be reflected on further reports). A period analysis yielded 0.05698(4) d. This could be a signature of emerging superhumps. The amplitude is, however, very low and more observations are definitely needed for a secure identification.

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[vsnet-campaign-dn 15996] ASASSN-19ax: possible superhump
by Taichi Kato 17 Sep '21

17 Sep '21

ASASSN-19ax: possible superhump Kiyota-san reported observations. The object showed 0.3-mag variation resembling a superhump. The length of observation was not sufficient to record a full cycle. The period (if the variation is periodic) appears to be longer than 2 hr and the object could be an SU UMa star above the period gap. Further observations are strongly encouraged.

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[vsnet-campaign-dn 15944] PNV J21581852+2419246 superoutburst (since Aug. 27)
by Patrick Schmeer 17 Sep '21

17 Sep '21

PNV J21581852+2419246 (UGSU) https://www.aavso.org/vsx/index.php?view=detail.top&oid=270725 Bright since 2021 August 27.470 UT (orange mag. 14.5) according to ATLAS data (last non-detection on Aug. 25.399 UT; orange mag. 16.0 on September 4.46 UT). Time-resolved photometry is encouraged. Clear skies, Patrick ------------ References: Asteroid Terrestrial-impact Last Alert System (ATLAS): - Tonry et al., 2018PASP..130f4505T --------------------------------------------- Gary Poyner wrote on Saturday, 4 September 2021 at 15:26:11 UTC: The UGSU star OT J215818.5+241925 (PNV J21581852+2419246) is in outburst. The first detected since September 2018... September 03.940 14.903CV Open University COAST regards, Gary

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[vsnet-campaign-dn 15994] ASASSN-19ax possible superoutburst
by Taichi Kato 17 Sep '21

17 Sep '21

ASASSN-19ax possible superoutburst Suspected type from ZTF + ASAS-SN data. YYYYMMDD(UT) mag observer 20210906.9583 <142 (Eddy Muyllaert) 20210908.9069 <142 (Eddy Muyllaert) 20210909.9368 <142 (Eddy Muyllaert) 20210910.9194 128 (Eddy Muyllaert) 20210911.8451 127 (Eddy Muyllaert) 20210911.883 12.73C (Gary Poyner) 20210915.9076 128 (Eddy Muyllaert)

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[vsnet-campaign-dn 15993] LL And: early superhumps
by Taichi Kato 16 Sep '21

16 Sep '21

LL And: early superhumps Crimean Astrophys. Obs. team has reported observations. The combined data yielded a period of 0.0552(1) d, in agreement with the orbital period of 0.055055 d. The profile is doubly humped and the amplitude was 0.025 mag. Further observations are encouraged.

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[vsnet-campaign-dn 15992] LL And variation
by Taichi Kato 16 Sep '21

16 Sep '21

LL And variation Kyoto U. team and Tamas Tordai have reported observations. Although some variations were present, the period was not the same as the orbital period. Since the runs were not very long, more observations would clarify whether they were early superhumps or not.

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[vsnet-campaign-dn 15990] ASASSN-18vb: new SU UMa-type dwarf nova
by Taichi Kato 15 Sep '21

15 Sep '21

ASASSN-18vb: new SU UMa-type dwarf nova Tamas Tordai has reported observations. The object shows superhumps with a period of 0.0832(7) d and an amplitude of 0.21 mag.

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[vsnet-campaign-dn 15989] MASTER OT J221811.12+654219.9 superoutburst
by Taichi Kato 15 Sep '21

15 Sep '21

MASTER OT J221811.12+654219.9 superoutburst YYYYMMDD(UT) mag observer 20210908.3480 19.897zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210908.5962 <163c (Yutaka Maeda) 20210909.6506 <166c (Yutaka Maeda) 20210910.1999 15.073zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210910.2206 15.005zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210912.2642 14.551zg (Zwicky Transient Facility Lasair (Masci+ 2019))

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[vsnet-campaign-dn 15988] CRTS J212625.1+201948 superoutburst
by Taichi Kato 14 Sep '21

14 Sep '21

CRTS J212625.1+201948 superoutburst ER UMa-like object. Supercycle about 80 d. YYYYMMDD(UT) mag observer 20210908.1957 18.380zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210908.1971 18.441zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210910.1947 15.825zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210912.1973 15.875zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210914.2242 16.068zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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vsnet-campaign-dn September 2021