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

[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)

1 0

[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)

1 0

[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)

1 0

[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

1 1

[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.

1 0

[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))

1 0

[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

1 0

[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.

1 0

[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)

1 0

[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.

1 0