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

[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 16 Aug '22

16 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 26900] Re: [VSS] V0854 CEN fading? and S Aps possible fade
by Peter Williams 05 Aug '22

05 Aug '22

Hello! The RCB star V854 Cen has continued to fade as per the recent visual observations. S Aps, however, remains bright but a little below its nominal maximum brightness. APSS 20220801.377 99 WPX APSS 20220803.470 102 WPX CENV854 20220801.370 87 WPX CENV854 20220803.463 96 WPX Tks and regards Peter Williams Heathcote NSW 20x80mm binoculars From: Peter Williams [mailto:pfwilliams@onaustralia.com.au] Sent: Saturday, 30 July 2022 8:58 PM To: 'VariableStarsSouth(a)googlegroups.com' <VariableStarsSouth(a)googlegroups.com> Cc: vsnet rcb (vsnet-rcb(a)ooruri.kusastro.kyoto-u.ac.jp) <vsnet-rcb(a)ooruri.kusastro.kyoto-u.ac.jp>; vsnet alert (vsnet-alert(a)ooruri.kusastro.kyoto-u.ac.jp) <vsnet-alert(a)ooruri.kusastro.kyoto-u.ac.jp> Subject: RE: [VSS] V0854 CEN fading? and S Aps possible fade Hi Marcos and All, As noted below, the RCB star V854 Cen may have commenced to decline (10x50mm binoculars): CENV854 20220717.386 74 WPX CENV854 20220724.420 73 WPX CENV854 20220727.410 74 WPX CENV854 20220728.432 75 WPX CENV854 20220730.368 81 WPX Also, the RCB star S Aps is also fainter than usual tonight and may have commenced to decline (20x80mm binoculars): APSS 20220717.418 95 WPX APSS 20220724.465 97 WPX APSS 20220727.454 97 WPX APSS 20220728.403 96 WPX APSS 20220730.429 100 WPX Further observations will confirm if either or both of these stars continue into a deep decline. Tks and regards Peter Williams Heathcote NSW From: 'Peter Williams' via Variable Stars South [mailto:VariableStarsSouth@googlegroups.com] Sent: Saturday, 30 July 2022 5:37 PM To: VariableStarsSouth(a)googlegroups.com <mailto:VariableStarsSouth@googlegroups.com> Subject: RE: [VSS] V0854 CEN fading? Hi Marcos, V854 Cen is perhaps the most active of the RCB stars and would seem ready for a deep decline, if not overdue. I have noticed its SR variations having a marginally greater amplitude during June and July and that has in previous cases led to a decline onset. My most recent observation was on Thursday, July 28.432UT at magnitude 7.5. That is marginally fainter than usual and with your most recent magnitude of 7.9, it may well indicate the onset of a decline. It will sometimes stall near magnitude 8 and return to maximum but if it goes below magnitude 8.5 then a deep decline is most likely underway. Hopefully the twilight clouds will clear tonight! Tks and regards Peter Williams From: variablestarssouth(a)googlegroups.com <mailto:variablestarssouth@googlegroups.com> [mailto:variablestarssouth@googlegroups.com] On Behalf Of Marcos Silva Sent: Saturday, 30 July 2022 8:03 AM To: Variable Stars South <VariableStarsSouth(a)googlegroups.com <mailto:VariableStarsSouth@googlegroups.com> > Subject: [VSS] V0854 CEN fading? Dear VSS friends, last night i observed the RCB star V0854 Cen fainter than the comparison star of mag 7.5. I have observed it here again now and estimated the magnitude of 7.9, we have some cirrus here at the moment, so the star could be a little bit brighter (7.8 or 7.7). But it is still fainter than 7.5 and brighter than 8.2. I'm warning you because this could be the beginning of a fading of the star. -- You received this message because you are subscribed to the Google Groups "Variable Stars South" group. To unsubscribe from this group and stop receiving emails from it, send an email to VariableStarsSouth+unsubscribe(a)googlegroups.com <mailto:VariableStarsSouth+unsubscribe@googlegroups.com> . To view this discussion on the web, visit https://groups.google.com/d/msgid/VariableStarsSouth/fac2f5ce-2d73-4872-bd5… <https://groups.google.com/d/msgid/VariableStarsSouth/fac2f5ce-2d73-4872-bd5…> . -- You received this message because you are subscribed to the Google Groups "Variable Stars South" group. To unsubscribe from this group and stop receiving emails from it, send an email to VariableStarsSouth+unsubscribe(a)googlegroups.com <mailto:VariableStarsSouth+unsubscribe@googlegroups.com> . To view this discussion on the web, visit https://groups.google.com/d/msgid/VariableStarsSouth/000001d8a3e7%2420fb1b9… <https://groups.google.com/d/msgid/VariableStarsSouth/000001d8a3e7%2420fb1b9…> .

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