August 2022 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9402] ASASSN-22jz: new WZ Sge-type dwarf nova
by Taichi Kato 12 Aug '22

12 Aug '22

ASASSN-22jz: new WZ Sge-type dwarf nova Berto Monard has reported observations on two nights. The object was fading rather rapidly (0.3 mag/d), probably in viscous fading phase. Although there were much irregularity, I could detect a period of 0.05404(4) d (double wave, 0.035 mag). Although the profile is not very typical for early superhumps, the period appears to be real based on the appearance of one-day aliases. The rather unusual profile of early superhumps a result of their low amplitude and overlapping irregularity. Considering the outburst amplitude and peak M_V, this object can be identified to be a WZ Sge star.

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[vsnet-newvar 9401] PS1-3PIJ225724.61+480659.4=ZTFJ225724.61+480659.4=ZTF18aboshpo
by Taichi Kato 10 Aug '22

10 Aug '22

PS1-3PIJ225724.61+480659.4=ZTFJ225724.61+480659.4=ZTF18aboshpo https://www.aavso.org/vsx/index.php?view=detail.top&oid=2228285 Porb=0.1358156(7) d from ZTF data. Amplitude 0.18 mag.

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[vsnet-newvar 9400] ZTFJ061429.37+793024.1=ZTF18accmhht: polar
by Taichi Kato 10 Aug '22

10 Aug '22

ZTFJ061429.37+793024.1=ZTF18accmhht: polar Using ZTF data, I obtained a period of 0.0822436(2) d (single hump per orbit). The overall behavior also does not resemble that of a VY Scl star (too rapid fading and flat bottom).

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[vsnet-newvar 9399] ZTFJ050541.47+680015.1=ZTF18abwcfvv: NL+E
by Taichi Kato 10 Aug '22

10 Aug '22

ZTFJ050541.47+680015.1=ZTF18abwcfvv: NL+E https://www.aavso.org/vsx/index.php?view=detail.top&oid=2228287 According to Gaia variable stars, it was classified as 050541.4 +680014 (2000.0) Gaia_DR3_483798207282350976 ECL (score=0.48) 050541.4 +680014 (2000.0) Gaia_DR3_483798207282350976 vtype=E P=0.20496893(0.00000043) I obtained a period of 0.2049695(3) d using ZTF data. Typical NL+E light curve.

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[vsnet-newvar 9398] MASTER OT J001204.00-412337.4: strange behavior
by Taichi Kato 10 Aug '22

10 Aug '22

MASTER OT J001204.00-412337.4: strange behavior Josch Hambsch has reported new observations. The object started fading rapidly on Aug. 8. The duration of the superoutburst (8 d) is too short for a WZ Sge star. Observations of subsequent behavior are very important (the object still shows superhumps).

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[vsnet-newvar 9397] ASASSN-22jz: bright dwarf nova outburst (mag. 9.7) in Hydra
by Patrick Schmeer 08 Aug '22

08 Aug '22

ASASSN-22jz = AT 2022qwf (UG:) (submitted to VSX) Discovery circumstances: https://www.wis-tns.org/object/2022qwf 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/6863cfab-4837-4bdd-bffb-552ee… ASASSN-22jz 20220805.9828 <16.47g ASN ASASSN-22jz 20220808.0109 10.22g ASN ASASSN-22jz 20220808.0121 9.74g ASN ASASSN-22jz 20220808.0133 9.77g ASN A DASCH search revealed a previous (super?)outburst recorded on Harvard plates: 1920 April 14.205 UT, mpg. 10.92 1920 April 14.250 UT, mpg. 11.01 1920 April 22.085 UT, mpg. 11.83 1920 April 22.216 UT, mpg. 11.33 ASASSN-22jz looks like a WZ Sge-type dwarf nova outburst (amplitude 9 magnitudes) at a distance of ~230 pc. Time-resolved photometry is urgently required. Clear skies, Patrick

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[vsnet-newvar 9396] PNV J00442079+4123111: new eruption of M31N 2005-10a
by Patrick Schmeer 07 Aug '22

07 Aug '22

M31N 2005-10a = TSS J004420.7+412311 (NR) https://www.aavso.org/vsx/index.php?view=detail.top&oid=2228267 Discovery circumstances: https://www.astronomerstelegram.org/?read=627 http://www.cbat.eps.harvard.edu/unconf/followups/J00442079+4123111.html https://www.wis-tns.org/object/2022qpg ASAS-SN Sky Patrol light curves and data: https://asas-sn.osu.edu/sky-patrol/coordinate/1bea0304-f646-492c-8a5a-c6228… https://asas-sn.osu.edu/sky-patrol/coordinate/8ed69951-fbd4-4a0c-ab0b-235c6… Zwicky Transient Facility (ZTF) light curve and data: https://lasair-ztf.lsst.ac.uk/object/ZTF22aazdzyj/ AAVSO data: https://app.aavso.org/webobs/results/?star=M31N+2005-10a Further spectroscopy and multiband photometry are required. 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 Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M

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[vsnet-newvar 9395] TCP J19212834-3058481: new transient (mag. 15) in Sagittarius
by Patrick Schmeer 07 Aug '22

07 Aug '22

TCP J19212834-3058481 = BraTS-SON-T2-039 (UG:/N:) (submitted to VSX) Discovery circumstances: http://www.cbat.eps.harvard.edu/unconf/followups/J19212834-3058481.html https://www.wis-tns.org/object/2022qry 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/a7b24cdd-a176-4ee2-8a1d-87380… TCPJ19212834-3058481 20220804.2817 <16.70g ASN TCPJ19212834-3058481 20220805.1694 16.34g ASN TCPJ19212834-3058481 20220805.1707 16.44g ASN TCPJ19212834-3058481 20220805.1719 16.24g ASN TCPJ19212834-3058481 20220805.2729 15.73g ASN TCPJ19212834-3058481 20220805.2741 15.81g ASN TCPJ19212834-3058481 20220805.2754 15.95g ASN TCPJ19212834-3058481 20220806.1698 15.41g ASN TCPJ19212834-3058481 20220806.1710 15.26g ASN TCPJ19212834-3058481 20220806.1723 15.26g ASN In the Pan-STARRS1 i-band image, there is a faint object 1.7" SW of the transient that looks like a (spiral) galaxy. Spectroscopy and multiband as well as time-resolved photometry are required. Clear skies, Patrick

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[vsnet-newvar 9391] ASASSN-19oc
by Taichi Kato 04 Aug '22

04 Aug '22

ASASSN-19oc Noise? WZ Sge star with a dip in the early stage of the superoutburst. YYYYMMDD(UT) mag observer 20220726.5640 <162c (Yutaka Maeda) 20220802.5037 128:c (Yutaka Maeda)

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[vsnet-newvar 9392] ASASSN-13ce
by Taichi Kato 04 Aug '22

04 Aug '22

ASASSN-13ce SU UMa star. YYYYMMDD(UT) mag observer 20220726.8095 <161c (Yutaka Maeda) 20220802.7828 145:cG (Yutaka Maeda)

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vsnet-newvar August 2022