January 2022 - vsnet-campaign-dn - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-campaign-dn 16214] ASASSN-22au
by Taichi Kato 21 Jan '22

21 Jan '22

ASASSN-22au Large-amplitude outburst. ASASSN-22au --- ------- 7:56:28.53 -79:2:39.7 2022-01-16.36 13.76 SDSS DSS VIZIER ------- CV candidate, no Vizier match, g>17.8 on 2022-01-13.24, g=14.1 on 2022-01-16.30, g=14.3 on 2022-01-17.09, g=14.7 on 2022-01-18.81 ASASSN-22au 20220113.24 <178g ASN ASASSN-22au 20220116.30 141g ASN ASASSN-22au 20220117.09 143g ASN ASASSN-22au 20220118.81 147g ASN

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[vsnet-campaign-dn 16213] ASASSN-20pv outburst (since Jan. 20)
by Patrick Schmeer 20 Jan '22

20 Jan '22

ASASSN-20pv (UGSU, AM CVn star?) https://www.aavso.org/vsx/index.php?view=detail.top&oid=2214355 Recent 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/c52dbc25-5e71-4947-a906-97fae… ASASSN-20pv 20220119.2103 <16.15g ASN ASASSN-20pv 20220120.1483 12.29g ASN ASASSN-20pv 20220120.1495 12.34g ASN Time-resolved photometry is encouraged. Clear skies, Patrick ---------- Rod Stubbings wrote on Thursday, 20 January 2022 at 14:25:07 UTC: ASASSN-20pv (UGSU/IBWD:) is in outburst ASASSN-20pv 220120.535 123 -- Rod Stubbings Tetoora Road Observatory Victoria, Australia Telescope: "Infinity" 22" f/3.8 stubbo(a)dcsi.net.au http://rodstubbingsobservatory.wordpress.com/

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[vsnet-campaign-dn 16212] ASASSN-15cg: (likely) superoutburst in 2021 Oct.-Nov.
by Patrick Schmeer 16 Jan '22

16 Jan '22

ASASSN-15cg (UGSU:) https://www.aavso.org/vsx/index.php?view=detail.top&oid=400079 Recent 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/61eb8548-4003-48a0-af94-a9a35… Precursor outburst on 2021 October 22-23, followed by a (probable) superoutburst from October 28 to November 6 (which lasted only 9 days). Regards, Patrick ----------- Taichi Kato wrote (vsnet-chat 8336, 21 May 2019 at 05:10:54 UTC): ASASSN-15cg: SU UMa star Precursor + superoutburst in 2019 Mar. Superhump observations during the next superoutburst are required. ASAS-SN data: https://asas-sn.osu.edu/light_curves/cd3775fb-0434-43ef-a600-aaf8b029d90c

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[vsnet-campaign-dn 16210] EX Hya outburst (since Jan. 8): rebrightening on Jan. 14
by Patrick Schmeer 16 Jan '22

16 Jan '22

EX Hydrae (UG+NLDQ+E) Intermediate polar, eclipsing, orbital period: 0.068234 d (98.257 min) From "activity at a glance (Jan 16)" (T. Kato, vsnet-outburst 28234): 20220103.7814 133:cG (Yutaka Maeda) 20220107.8029 130:cG (Yutaka Maeda) 20220107.853 132 (Hiroyuki Maehara) 20220108.867 100 (Hiroyuki Maehara) 20220109.581 98 (Rod Stubbings) 20220109.7724 107cG (Yutaka Maeda) 20220109.7724 107cG (Yutaka Maeda) 20220111.585 128 (Rod Stubbings) 20220111.862 126 (Hiroyuki Maehara) 20220115.853 118 (Hiroyuki Maehara) Recent 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/3952b0d4-b5a1-4d54-bdda-c209b… HYAEX 20220106.3562 13.19g ASN HYAEX 20220110.2402 11.14g ASN HYAEX 20220111.5182 13.02g ASN HYAEX 20220113.0232 12.75g ASN HYAEX 20220114.0460 11.57g ASN Precursor outburst followed by a superoutburst? However, in this case the precursor outburst would have been much brighter than the superoutburst. Time-resolved photometry is urgently required. Clear skies, Patrick

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[vsnet-campaign-dn 16209] RZ Leo: started to show ordinary superhumps?
by 反保雄介 15 Jan '22

15 Jan '22

RZ Leo: started to show ordinary superhumps? Tamás Tordai and Kyoto Univ. Obs. have reported further observations of RZ Leo. The data on 15th Jan at Kyoto Univ. Obs. showed a large amplitude (~0.3 mag) variation, which has a significantly larger amplitude of its early superhumps (see vsnet-alert 26529). Time-resolved observations are strongly encouraged to examine its superhump evolution. Best, Yusuke

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[vsnet-campaign-dn 16207] ASASSN-22as
by Taichi Kato 15 Jan '22

15 Jan '22

ASASSN-22as ASASSN-22as --- ------- 15:17:56.64 45:38:33.1 2022-01-13.62 14.52 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=22.1, g>18.6 on 2022-01-07.59, g=14.1 on 2022-01-10.62, g=14.8 on 2022-01-13.62 ASASSN-22as 20220107.59 <186g ASN ASASSN-22as 20220110.62 141g ASN ASASSN-22as 20220113.62 148g ASN 151756.233 +453832.77 (2000.0) GALEX_DR5_6374962000150138599 NUV=22.280(0.412) FUV=-(-)

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[vsnet-campaign-dn 16206] RZ Leo: early superhumps
by Taichi Kato 15 Jan '22

15 Jan '22

RZ Leo: early superhumps Kiyota-san and Itoh-san have reported observations. The object now clearly show 0.09-mag early superhumps. The period was 0.07578(4) d, not positive superhumps. Porb=0.076038 d. WZ Sge stars with this Porb are very rare.

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[vsnet-campaign-dn 16204] Re: ASASSN-22an is a dwarf nova
by Taichi Kato 14 Jan '22

14 Jan '22

Re: ASASSN-22an is a dwarf nova Interesting result. The object was bright in 2021 Oct. and it would be difficult to imagine that a dwarf nova outburst last nearly three months (unless they were separate outbursts), and it is still disk-dominated.

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[vsnet-campaign-dn 16203] RZ Leo: short-term variations
by Taichi Kato 14 Jan '22

14 Jan '22

RZ Leo: short-term variations Itoh-san reported observations. The object showed variations and they may have been early superhumps. Observation are encouraged.

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[vsnet-campaign-dn 16202] Re: RZ Leo outburst
by Patrick Schmeer 14 Jan '22

14 Jan '22

RZ Leonis (UGWZ) https://www.aavso.org/vsx/index.php?view=detail.top&oid=17049 Recent 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/d20d5eca-56b8-4595-a806-63244… LEORZ 20220111.5274 <17.78g ASN Latest ATLAS (Tonry et al., 2018PASP..130f4505T) data: LEORZ 20220111.6380 18.43cy ATLAS (forced photometry) Time-resolved photometry is urgently required. Clear skies, Patrick ------- Hiroyuki Maehara wrote on Thursday, 13 January 2022 at 00:42:03 UTC: According to Kojima-san, RZ Leo is in outburst. object YYYYMMDD(UT) mag code LEORZ 20220112.791 136c TKo Observer: Tadashi Kojima (Gunma, Japan) Instruments: f.l.=200mm lens + Canon EOS 6D

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vsnet-campaign-dn January 2022