January 2023 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27039] GX Cas (UGSU) outburst
by Kirill Sokolovsky 20 Aug '23

20 Aug '23

The UGSU-type dwarf nova GX Cas is in outburst according to NMW survey photometry (135mm f/2.0 lens + unfiltered ST-8300M CCD): 2022-11-13.7397 2459897.2397 13.4 CV AAVSO observer KLO reports visual observation of this outburst: 2022-11-12.9520 2459896.4520 13.6 Vis. ASAS-SN photometry (latest observation is quiescence on 2022-11-12.165): https://asas-sn.osu.edu/sky-patrol/coordinate/7c8f8333-01a3-49aa-ba14-08b07… VSX record for GX Cas https://www.aavso.org/vsx/index.php?view=detail.top&oid=6537 Best wishes, Kirill Sokolovsky, Stanislav Korotkiy, Olga Smolyankina, Anna Prokudina, Sergei Ostapenko

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[vsnet-alert 27360] TCP J04361641+5628241: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 31 Jan '23

31 Jan '23

Dear colleagues, TCP J04361641+562824 (aka AT 2023ayf) has been very recently detected by the XOSS team (see TNS Astronomical Transient Report No. 170114). I have just finished analysing my unfiltered CCD observations of TCP J04361641+5628241, obtained on 2023, Jan 28/29 at CBA Extremadura Observatory (Spain) using a 0.40-m f/5.1 telescope and SX-46 CCD camera under clear skies. The resulting light curve clearly shows the presence of a superhump with an amplitude of 0.39 mag, establishing TCP J04361641+5628241 as a new SU UMa-type dwarf nova. An accurate period analysis was not yet possible, due to the lack of multiple superhumps within the observation window, but it clearly is an object with a long superhump period. A rough estimate puts it at 0.095d, but further observations are needed to firmly establish the superhump period. The object was at mag CV = 14.7 on Jan 28th. I will send my observations to AAVSO, CBA and VSNET for further analysis. Best regards Tonny --- Tonny Vanmunster CBA Belgium Observatory CBA Extremadura Observatory <http://www.cbabelgium.com> http://www.cbabelgium.com PERANSO: The Light Curve and Period Analysis Software http://www.peranso.com

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[vsnet-alert 27361] ZTF J043616.39+562824.3 = TCP J04361641+5628241 superhump period
by Taichi Kato 31 Jan '23

31 Jan '23

ZTF J043616.39+562824.3 = TCP J04361641+5628241 superhump period Tonny Vanmunster and Kiyota-san have reported observations. The superhump period appears to be 0.08040(3) d (amplitude 0.29 mag). Other aliases are possible, but less likely.

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[vsnet-alert 27359] ASASSN-20kt: rare, bright outburst
by Taichi Kato 29 Jan '23

29 Jan '23

ASASSN-20kt: rare, bright outburst YYYYMMDD(UT) mag observer 20230107.066 <16.20C (Gary Poyner) 20230107.0662 <175C (Masao Funada) 20230108.2355 <177C (Masao Funada) 20230124.2658 17.148zg (ZTF Alert DC mag (Masci+ 2019)) 20230124.2735 16.917zr (ZTF Alert DC mag (Masci+ 2019)) 20230125.3326 16.360zr (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-alert 27358] ASASSN-23af: superhump period
by Taichi Kato 28 Jan '23

28 Jan '23

ASASSN-23af: superhump period Due to the short visibility, the superhump period has not yet been pinned down. The most likely period is 0.06076(4) d (allowing aliases). The waveform was clear and there is no ambiguity in classification. The amplitude is small (0.12 mag) and this object may show multiple rebrightenings. Observers: Josch Hambsch and Berto Monard

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[vsnet-alert 27357] ASASSN-23ag: superhump period
by Taichi Kato 28 Jan '23

28 Jan '23

ASASSN-23ag: superhump period Using data since Jan. 23, the superhump period is 0.05509(3) d (amplitude 0.22 mag). Observers: Itoh-san, Tonny Vanmunster and Josch Hambsch.

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[vsnet-alert 27356] UY Pup standstill
by Taichi Kato 28 Jan '23

28 Jan '23

UY Pup standstill YYYYMMDD(UT) mag observer 20230118.9083 14.439c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230118.9105 14.435c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230118.9314 14.451c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230118.9346 14.478c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.2148 14.432o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.2184 14.436o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.2247 14.417o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.2598 14.413o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.9704 14.522c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.9804 14.521c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.9869 14.514c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230119.9911 14.515c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.4395 14.463o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.4537 14.428o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.4591 14.437o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.4623 14.432o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.490 142 (Rod Stubbings) 20230120.9090 14.528c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.9108 14.529c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.9140 14.555c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230120.9377 14.537c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230121.5903 146:c (Yutaka Maeda) 20230122.2707 14.407zr (ZTF Alert DC mag (Masci+ 2019)) 20230122.506 142 (Rod Stubbings) 20230123.9537 14.621c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230123.9570 14.659c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230123.9851 14.686c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.0136 14.659c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.2740 14.559zr (ZTF Alert DC mag (Masci+ 2019)) 20230124.3178 14.785zg (ZTF Alert DC mag (Masci+ 2019)) 20230124.4352 14.569o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.4388 14.595o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.4730 14.602o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.4850 14.615o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.8263 14.749c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.8600 14.685c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.8668 14.663c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230124.8704 14.691c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230125.2108 14.614o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230125.2139 14.588o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230125.2209 14.597o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230125.2399 14.592o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.1844 14.568o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.1876 14.567o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.2034 14.596o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.2281 14.579o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.490 144 (Rod Stubbings) 20230126.9307 14.509c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.9583 14.514c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.9653 14.504c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230126.9870 14.563c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230127.1930 14.396o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230127.1962 14.371o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230127.2233 14.326o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230127.2305 14.318o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230127.517 142 (Rod Stubbings)

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[vsnet-alert 27355] V1108 Her: complex variations
by Taichi Kato 27 Jan '23

27 Jan '23

V1108 Her: complex variations Kiyota-san's second night observations on Jan. 25 showed complex variations. Although the observing window was short, this may have been a part of early-superhump variations.

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[vsnet-alert 27354] PNVJ06245297+0208207: brightened further, Porb?
by Taichi Kato 27 Jan '23

27 Jan '23

PNVJ06245297+0208207: brightened further, Porb? Itoh-san's new observations indicate that the object further brightened to 12 mag but superhumps have become weaker (amplitude typical for AM CVn stars). Crimean Astrophys. Obs. team also reported the rising part and superhumps were already present on Jan. 21 (good job!). Preliminary analysis of the initial outburst yielded a possible period of 0.03433(4) d. Amplitude 0.02 mag and slower rise (similar to early superhumps).

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[vsnet-alert 27353] PNVJ06245297+0208207: ordinary superhumps (AM CVn, P=0.0352 d)
by Taichi Kato 26 Jan '23

26 Jan '23

PNVJ06245297+0208207: ordinary superhumps (AM CVn, P=0.0352 d) Itoh-san obtained long time-resolved photometry on Jan. 25 and detected singly peaked superhumps. These humps were also present in Tordai's observation on Jan. 24 and Vanmunster's on Jan. 23-24 (doubly humped). Thanks to all these observers, the rising phase of the superoutburst was covered. The superhump period is 0.035185(8) d (stage A+B?). The period is longer than the oribital period of GP Com and the lack of hydrogen lines has been confirmed. Very important finding and object.

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