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

[vsnet-alert 26540] ASASSN-22ax
by Taichi Kato 24 Jan '22

24 Jan '22

ASASSN-22ax Bright CV detected early. ASASSN-22ax --- ------- 2:53:21.49 -13:34:9.3 2022-01-20.18 13.44 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.5, g>17.2 on 2022-01-18.27, g=15.9 on 2022-01-19.22, g=13.6 on 2022-01-20.12 ASASSN-22ax 20220118.27 <172g ASN ASASSN-22ax 20220119.22 159g ASN ASASSN-22ax 20220120.12 136g ASN 025321.486 -133408.83 (2000.0) Gaia_DR2_5157734725783900032 plx=-(-) dismod=- pmra=-(-) pmdec=-(-) G=20.639 BP=20.719 RP=20.478 025321.486 -133408.83 (2000.0) Gaia_EDR3_5157734725783900032 plx=-0.681(1.731) dismod=- pmra=-10.028(1.037) pmdec=-18.710(1.362) G=20.572 BP=20.396 RP=20.680 025321.479 -133408.51 (2000.0) GALEX_DR5_2920234851152954444 NUV=20.984(0.066) FUV=21.024(0.092)

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[vsnet-alert 26543] ASASSN-22as: new SU UMa (or even WZ Sge?) star in the period gap
by Taichi Kato 24 Jan '22

24 Jan '22

ASASSN-22as: new SU UMa (or even WZ Sge?) star in the period gap Tonny Vanmunster and Tamas Tordai have reported observations. I could find a period of 0.09974(9) d (full amplitude of 0.10 mag). The profile resembles that of early superhumps (doubly peaked, sharp minimum) rather than ordinary superhumps. It is also possible that these superhumps are stage A superhumps. If this is indeed a WZ Sge star, it is very unusual. Further observations are needed to follow the development of these superhumps.

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[vsnet-alert 26542] ASASSN-22aw: superhump period
by Taichi Kato 24 Jan '22

24 Jan '22

ASASSN-22aw: superhump period Tamas Tordai and Itoh-san have reported observations. The superhump period is 0.07196(9) d.

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[vsnet-alert 26541] ASASSN-22aw: most likely SU UMa star
by Taichi Kato 22 Jan '22

22 Jan '22

ASASSN-22aw: most likely SU UMa star Tamas Tordai has reported observations. There was a 0.4 mag hump (likely superhump). More observations are needed to determine the period.

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[vsnet-alert 26539] 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-alert 26536] ASASSN-20pv outburst
by Rod Stubbings 21 Jan '22

21 Jan '22

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-alert 26533] EX Hya outburst (since Jan. 8): rebrightening on Jan. 14
by Patrick Schmeer 21 Jan '22

21 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-alert 26532] RZ Leo: started to show ordinary superhumps?
by 反保雄介 18 Jan '22

18 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-alert 26530] 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-alert 26529] 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-alert January 2022