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[vsnet-campaign-dn 16002] LL And showing regular superhumps
by tonny.vanmunster＠gmail.com 21 Sep '21

21 Sep '21

Dear colleagues, I obtained another LL And time series last night (2021, Sep 20/21) at CBA Extremadura Observatory in Spain, using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. Looking at the resulting light curve, it seems that early superhumps have now been replaced by regular superhumps with an amplitude of 0.15 mag. The object was at mag CV = 13.9 on Sep 21st. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny … [View More]

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[vsnet-campaign-dn 16001] TCP J20115874-1922459: likely a dwarf nova outburst (mag. 15, in Capricornus)
by Patrick Schmeer 21 Sep '21

21 Sep '21

TCP J20115874-1922459 = BraTS-SON-T2-032 (UG:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=2224741 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/eaad0624-e1cc-4b94-81ea-82a5d… Outburst amplitude 7 magnitudes. Already in … [View More]

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[vsnet-campaign-dn 16000] ASASSN-19ax: new long period SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 18 Sep '21

18 Sep '21

Dear colleagues, I have just finished analysing my unfiltered observations of ASASSN-19ax, obtained on 2021, September 17/18 at CBA Belgium Observatory (0.40-m f/10.0 telescope, QHY-268M CMOS, clear then clouds) and at CBA Extremadura Observatory (0.40-m f/5.1 telescope, SX-46 CCD, clear then clouds). The combined lightcurve covers a time span of 7.2h and clearly shows the presence of superhumps with an amplitude of 0.26 mag, establishing ASASSN-19ax as a new SU UMa-type dwarf nova. A period … [View More]

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[vsnet-campaign-dn 15999] ASASSN-15sn possible superoutburst
by Taichi Kato 18 Sep '21

18 Sep '21

ASASSN-15sn possible superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20210908.6476 <153c (Yutaka Maeda) 20210916.2647 15.384zr (Zwicky Transient Facility Lasair (Masci+ 2019))

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[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 … [View More]

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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 … [View More]

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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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