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[vsnet-alert 27367] CRTS J141712.0-180328: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 01 Feb '23

01 Feb '23

Dear colleagues, I have just finished analysing my unfiltered CCD observations of CRTS J141712.0-180328 (aka CSS 080425:141712-180328) obtained on 2023, Jan 31/Feb 01 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 regular superhumps with an amplitude of 0.17 mag, establishing CRTS J141712.0-180328 as a new SU UMa-type dwarf nova. A period analysis, using the ANOVA, Generalized-Lomb-Scargle, PDM and Conditional Entropy methods (Peranso 3.0) yields a combined superhump period of 0.0853 +/- 0.0038d. The object was at mag CV = 14.6 on Jan 31st. 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 27366] CRTS J141712.0-180328 indeed most likely superoutburst
by Taichi Kato 01 Feb '23

01 Feb '23

CRTS J141712.0-180328 indeed most likely superoutburst Outburst still young enough. ATLAS data suggest supercycle of 1.5 yr. YYYYMMDD(UT) mag observer 20230120.7877 <147c (Yutaka Maeda) 20230121.7760 <144c (Yutaka Maeda) 20230129.3037 16.065o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3068 16.024o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3104 15.990o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3198 15.893o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230129.3825 15.298o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3467 14.487o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3569 14.490o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3722 14.531o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.3786 14.534o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230130.7778 142c (Yutaka Maeda) 20230130.7778 142c (Yutaka Maeda) 20230131.0745 14.376c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230131.0782 14.359c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230131.1000 14.356c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230131.1106 14.378c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-alert 27365] GP CVn superoutburst (UGSU+E)
by Taichi Kato 01 Feb '23

01 Feb '23

GP CVn superoutburst (UGSU+E) YYYYMMDD(UT) mag observer 20230107.8480 <149c (Yutaka Maeda) 20230107.9094 <145C (Masayuki Moriyama) 20230108.7692 <145c (Yutaka Maeda) 20230109.8181 <147c (Yutaka Maeda) 20230110.7889 <151c (Yutaka Maeda) 20230113.2503 <184C (Masao Funada) 20230120.7712 155c (Yutaka Maeda) 20230121.7598 152c (Yutaka Maeda) 20230130.7078 153c (Yutaka Maeda)

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[vsnet-alert 27364] CRTS J141712.0-180328 relatively rare outburst
by Taichi Kato 01 Feb '23

01 Feb '23

CRTS J141712.0-180328 relatively rare outburst Likely superoutburst (Porb=0.0845 d) YYYYMMDD(UT) mag observer 20221231.8038 <141c (Yutaka Maeda) 20230103.7945 <142c (Yutaka Maeda) 20230110.8040 <142c (Yutaka Maeda) 20230120.7877 <147c (Yutaka Maeda) 20230121.7760 <144c (Yutaka Maeda) 20230130.7778 142c (Yutaka Maeda) 20230130.7778 142c (Yutaka Maeda)

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[vsnet-alert 27363] V803 Cen likely superoutburst
by Taichi Kato 01 Feb '23

01 Feb '23

V803 Cen likely superoutburst YYYYMMDD(UT) mag observer 20230120.569 153 (Rod Stubbings) 20230120.8962 <150C (Masayuki Moriyama) 20230122.567 <156 (Rod Stubbings) 20230131.606 126 (Rod Stubbings)

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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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