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

[vsnet-alert 26708] ASASSN-22eb: superhump period
by Taichi Kato 09 Apr '22

09 Apr '22

ASASSN-22eb: superhump period Josch Hambsch has reported further observations. The superhump period is 0.05919(3) d (amplitude 0.16 mag).

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[vsnet-alert 26707] CRTS J124507.8-381322: new SU UMa-type dwarf nova
by Taichi Kato 09 Apr '22

09 Apr '22

CRTS J124507.8-381322: new SU UMa-type dwarf nova Josch Hambsch has reported observations. Superhumps with amplitudes of 0.27 mag and a period of 0.08293(3) d were clearly recorded. YYYYMMDD(UT) mag observer 20220223.7654 <163C (Masayuki Moriyama) 20220407.408 122 (Rod Stubbings) 20220409.471 125 (Rod Stubbings)

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[vsnet-alert 26706] Gaia19bxc: very unusual object with a period of 0.04473647 d
by Taichi Kato 09 Apr '22

09 Apr '22

Re: Gaia19bxc: very unusual object with a period of 0.0223682 d Just a correction. P=0.04473647(3) d with two different maxima.

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[vsnet-alert 26705] Gaia19bxc: very unusual object with a period of 0.0223682 d
by Taichi Kato 09 Apr '22

09 Apr '22

Gaia19bxc: very unusual object with a period of 0.0223682 d From ZTF data. Polar-like orbital saw-tooth light curve (amplitude 1.3 mag) with P=0.0223682 d. Although this may be an intermediate polar with a very high amplitude (see Romanov V48, arXiv:2204.02598), I could not find a longer period. The SDSS color is red (faint in u, bright in z), possible detection in WISE W1. High and low states in ZTF data. Could be an ultrashort period polar.

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[vsnet-alert 26704] ASASSN-22eb: new SU UMa-type dwarf nova
by Taichi Kato 08 Apr '22

08 Apr '22

ASASSN-22eb: new SU UMa-type dwarf nova Josch Hambsch and Itoh-san have reported observations. Hambsch's data on Apr. 7 showed clear superhumps. The period was about 0.055 d. This object could be a WZ Sge star.

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[vsnet-alert 26701] ASASSN-22ff
by Naoto Kojiguchi 07 Apr '22

07 Apr '22

ASASSN-22ff Large outburst amplitude of 7 mag. ASASSN-22ff --- ------- 19:2:40.48 18:17:22 2022-04-5.4 15.14 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=22.5, g>18.3 on 2022-04-03.37, g=15.6 on 2022-04-05.40 ASAS-SN Sky Patrol (contaminated): https://asas-sn.osu.edu/sky-patrol/coordinate/26425847-1978-4d76-9407-dc02f… IDs: 190240.408 +181722.540 PS1_DR1_129942856683518080 g=22.5092(0.1801) r=21.8079(0.0718) i=21.3872(0.0728) z=21.011(0.1756) y=--(--) 190240.408 +181722.680 PS1_DR2_129942856683518080 g=23.1678(0.118422) r=21.898(0.053925) i=21.3788(0.04597) z=21.4571(0.104511) y=21.4205(0.197335) 190240.417 +181722.675 SDSSJ190240.41+181722.6 ObsDate=2004.7096 u=23.937(23.937) g=22.608(0.415) r=21.688(0.251) i=20.849(0.186) z=20.385(0.353) ASASSN-22ff 20220403.37 <183g ASN ASASSN-22ff 20220405.40 156g ASN

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[vsnet-alert 26700] Re: PKS 2258-022 = MGAB-V1095: short-period variation
by Taichi Kato 06 Apr '22

06 Apr '22

Re: PKS 2258-022 = MGAB-V1095: short-period variation Please disregard this message. I analyzed the data of MGAB-V1081.

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[vsnet-alert 26699] PKS 2258-022 = MGAB-V1095: short-period variation
by Taichi Kato 06 Apr '22

06 Apr '22

PKS 2258-022 = MGAB-V1095: short-period variation This object is identified with a radio-loud QSO (z=0.778). However, the ZTF data show short-term variations. The data were well expressed by a period of 0.1417938(2) d. The profile resembles that of a polar. There is no indication of z=0 feature in the SDSS spectrum. Very strange object!

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[vsnet-alert 26698] NGCA-V19: polar
by Taichi Kato 05 Apr '22

05 Apr '22

NGCA-V19: polar From ZTF data. Porb=0.0557435(1) d. Broad single maximum per cycle.

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[vsnet-alert 26697] V803 Cen likely superoutburst
by Taichi Kato 05 Apr '22

05 Apr '22

V803 Cen likely superoutburst YYYYMMDD(UT) mag observer 20220323.440 154 (Rod Stubbings) 20220323.7501 <140C (Masayuki Moriyama) 20220331.458 135 (Rod Stubbings) 20220403.0973 12.95C (Masao Funada)

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vsnet-alert April 2022