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

[vsnet-alert 26911] ASASSN-22jz is another ugwz star
by Berto Monard 24 Aug '22

24 Aug '22

Unfiltered observations of ASASSN-22jz were done at CBA KKO with nightly evening sessions on dates 19 to 23 oct 2022. The last session did run to well below airmass 2. They show that after 14d into outburst, asassn-22jz has at last gone into a strong modulation mode with superhumps of 0.11CR amplitude and a period of 0.0586d +/- 0.0003d. The actual superhumps did start around 21-22 oct. The mean magnitude around 23.8 oct was 11.87CR. The amplitude of the outburst, the 2 weeks time delay between first detection and the actual superhump signature, and the periodicity all point to a ugwz classification of the object. Yet another ugwz star detected by the ASASSN survey. The predicted abundance of these type objects is getting substantiated. Berto Monard / KKO Calitzdorp South Africa

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[vsnet-alert 26910] PS1-3PIJ035747.16-063851.1 = Gaia DR3 324488617195639360 = ASASSN-22kc = ZTF19abuskjw: new SU UMa-type dwarf nova
by Taichi Kato 24 Aug '22

24 Aug '22

PS1-3PIJ035747.16-063851.1 = Gaia DR3 324488617195639360 = ASASSN-22kc = ZTF19abuskjw: new SU UMa-type dwarf nova Josch Hambsch and Itoh-san have reported observations. The object shows superhumps with a period of 0.05761(3) d (amplitude 0.10 mag).

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[vsnet-alert 26909] MASTER OT J001204.00-412337.4: rebrightening
by Taichi Kato 18 Aug '22

18 Aug '22

MASTER OT J001204.00-412337.4: rebrightening Josch Hambsch has detected a rebrightening on Aug. 17. Having unusual outburst property, this object deserves continuous attention and time-resolved photometry.

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[vsnet-alert 26908] ASASSN-22kc
by Naoto Kojiguchi 15 Aug '22

15 Aug '22

ASASSN-22kc Large outburst amplitude of 7 mag. Possible WZ Sge-type object. ASASSN-22kc -- ------- 3:57:47.12 -6:38:51.8 2022-08-13.4 13.19 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.0, g>16.8 on 2022-08-11.44, g=13.6 on 2022-08-13.40, g=13.1 on 2022-08-15.53 035747.168 -063851.281 Gaia_DR2_3244886171956393600 Plx=2.5019(0.4672) dismod=8.0 pmRA=-1.982(0.702) pmDE=-35.717(0.555) G=19.6294(0.0202) BP-RP=0.6357 E(g-r)=0.080 E(B-V)=0.071 Ag=0.281 Ar=0.209 Ai=0.158 035747.170 -063850.741 Gaia_EDR3_3244886171956393600 Plx=2.665(0.3351) dismod=7.9 PM=34.876 pmRA=-1.29(0.338) pmDE=-34.853(0.256) G=19.47956(0.009911) BP-RP=0.591627 E(g-r)=0.080 E(B-V)=0.071 Ag=0.281 Ar=0.209 Ai=0.158 035747.168 -063851.266 PS1_DR1_100020594464933394 g=20.0076(0.0316) r=19.7348(0.0354) i=19.8109(0.0245) z=19.6572(0.0378) y=19.5907(0.0383) 035747.161 -063851.112 PS1_DR2_100020594464933394 g=19.9729(0.012006) r=19.6526(0.010248) i=19.7928(0.01067) z=19.7759(0.020035) y=19.6977(0.046113) 035747.161 -063851.112 PS1_DR2_100020594464933394 g=19.9472(0.012111) r=19.6602(0.010789) i=19.7906(0.010697) z=19.7132(0.019595) y=19.7539(0.047272) 035747.170 -063850.680 SDSSJ035747.16-063850.6 ObsDate=1999.7823 u=20.029(20.029) g=20.11(0.023) r=19.978(0.028) i=19.977(0.039) z=19.616(0.119) 035747.168 -063850.773 SDSSJ035747.16-063850.7 ObsDate=2000.7378 u=19.867(19.867) g=19.98(0.019) r=19.73(0.019) i=19.873(0.031) z=19.722(0.104) ASAS-SN Sky Patrol https://asas-sn.osu.edu/sky-patrol/coordinate/93515a5f-cbb0-46d8-adfa-b3335… ZTF alert https://alerce.online/object/ZTF19abuskjw MPChecker NO DATA ASASSN-22kc 20220811.449 <16.007g ASN ASASSN-22kc 20220813.401 13.511g ASN ASASSN-22kc 20220813.605 13.243o ATF ASASSN-22kc 20220815.538 13.090g ASN ASASSN-22kc 20220815.543 13.471o ATF

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[vsnet-alert 26907] 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-alert 26906] 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-alert 26904] ASASSN-22jv: microlensing event (mag. 12.4) in Hydrus
by Patrick Schmeer 09 Aug '22

09 Aug '22

ASASSN-22jv https://www.aavso.org/vsx/index.php?view=detail.top&oid=2228273 Double peak on 2022 July 31.13 UT (gmag. 12.4) and August 2.33 UT (gmag. 12.5) according to ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S and Kochanek et al. 2017PASP..129j4502K) data: https://asas-sn.osu.edu/sky-patrol/coordinate/88dc33d7-f1e4-4301-9faf-0d8e0… Regards, Patrick

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[vsnet-alert 26903] 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-alert 26902] 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-alert 26901] 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-alert August 2022