March 2023 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9854] SSSJ090619.2-275831: superhumps
by Taichi Kato 06 Mar '23

06 Mar '23

SSSJ090619.2-275831: superhumps Josch Hambsch has reported further observations. The data confirm the presence of large-amplitude superhumps. Although the data are still insufficient, a short superhump period (maybe slightly above 0.05 d, many aliases) is suggested. The object may be eclipsing. Further observations are encouraged.

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[vsnet-newvar 9853] V589 Her: not an SU UMa star?
by Taichi Kato 06 Mar '23

06 Mar '23

V589 Her: not an SU UMa star? > [vsnet-alert 27477] V589 Her possible superoutburst The object faded rather quickly. ATLAS data since 2016 did not show superoutbursts. The SU UMa-type classification was based on Vanmunter in 2002. I examined the AAVSO data and the profile of the claimed superhumps did not look like very stable, and the object faded too rapidly (0.2 mag/d) for a superoutburst. The classification requires independent observation during a long outburst (but such an one is missing at least recently). YYYYMMDD(UT) mag observer 20230225.7745 <154c (Yutaka Maeda) 20230226.3670 18.409c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230226.3851 18.594c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230226.3900 18.425c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230226.6306 18.390c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230226.6347 18.441c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230226.6496 19.112c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230226.7276 <160c (Yutaka Maeda) 20230227.7272 <156c (Yutaka Maeda) 20230302.3532 15.413c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.3568 15.398c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.3631 15.413c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.7736 148:c (Yutaka Maeda) 20230302.8352 151C (Masayuki Moriyama) 20230304.188 15.89C (Gary Poyner) 20230304.7627 <150c (Yutaka Maeda) 20230305.163 17.07C (Gary Poyner)

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[vsnet-newvar 9852] CRTS J161850.8-052509 superoutburst
by Taichi Kato 06 Mar '23

06 Mar '23

CRTS J161850.8-052509 superoutburst ATLAS data apparently show the sign of superhumps. YYYYMMDD(UT) mag observer 20230225.5875 16.339c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230225.5907 16.323c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230225.5968 16.329c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230225.6292 16.349c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.3653 16.308c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.3657 16.347c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.3684 16.328c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.3846 16.355c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230227.3940 16.296c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230301.1066 16.248o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230301.1102 16.124o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230301.1235 16.319o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230301.1343 16.392o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230301.1439 16.298o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.1096 16.265o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.1132 16.321o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.1287 16.446o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.1332 16.494o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230302.1466 16.256o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230303.3380 16.512o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230303.3412 16.604o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230303.3470 16.575o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230303.3525 16.658o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230303.3543 16.592o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230304.8408 166C (Masayuki Moriyama)

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[vsnet-newvar 9851] MASTER OT J193922.39+665346.0 likely superoutburst
by Taichi Kato 06 Mar '23

06 Mar '23

MASTER OT J193922.39+665346.0 likely superoutburst (Known SU UMa star. Short supercycle) YYYYMMDD(UT) mag observer 20230225.8624 <162c (Yutaka Maeda) 20230227.8140 <142c (Yutaka Maeda) 20230302.8611 <157c (Yutaka Maeda) 20230304.8500 151:c (Yutaka Maeda)

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[vsnet-newvar 9850] SSSJ090619.2-275831: large-amplitude variation
by Taichi Kato 05 Mar '23

05 Mar '23

SSSJ090619.2-275831: large-amplitude variation Josch Hambsch has reported observations. Large-amplitude (0.2-0.3 mag) variations were recorded, but are not yet securely identified as superhumps. More observations will clarify the nature.

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[vsnet-newvar 9849] MASTER OT J055845.55+391533.4: dip and rebrightening
by Taichi Kato 05 Mar '23

05 Mar '23

MASTER OT J055845.55+391533.4: dip and rebrightening According to observations by Itoh-san, this object faded to 16.8 (dip) on Mar. 2 and brightened again to 15.4 on Mar. 3. Superhumps are not currently apparent.

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[vsnet-newvar 9848] ASASSN-20av superoutburst
by Taichi Kato 05 Mar '23

05 Mar '23

ASASSN-20av superoutburst Known SU UMa star. YYYYMMDD(UT) mag observer 20230224.508 <180C (Mitsutaka Hiraga) 20230302.528 160C (Mitsutaka Hiraga) 20230303.462 163C (Mitsutaka Hiraga)

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[vsnet-newvar 9847] Gaia23ays
by Taichi Kato 04 Mar '23

04 Mar '23

Gaia23ays http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23ays/ Gaia23ays AT2023cta 2023-03-03 07:01:55 184.30874 -38.00620 16.25 unknown 2023-03-04 09:09:22 apparently hostless blue transient 121714.051 -380019.24 (2000.0) GALEX_DR5_6386115440733588477 NUV=21.304(0.368) FUV=-(-)

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[vsnet-newvar 9846] TCP J03400682+4809123: new SU UMa-type dwarf nova
by Taichi Kato 04 Mar '23

04 Mar '23

TCP J03400682+4809123: new SU UMa-type dwarf nova According to Itoh-san's observations on Mar. 3, this object showed superhumps (period about 0.065 d). Superhumps may have already appeared on Feb. 28.

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[vsnet-newvar 9845] ASASSN-16de superoutburst?
by Taichi Kato 04 Mar '23

04 Mar '23

ASASSN-16de superoutburst? (Known SU UMa star) YYYYMMDD(UT) mag observer 20230214.8655 <149c (Yutaka Maeda) 20230215.8701 <153c (Yutaka Maeda) 20230221.8241 <152c (Yutaka Maeda) 20230225.8272 158:c (Yutaka Maeda) 20230226.7798 <148c (Yutaka Maeda) 20230227.7792 <140c (Yutaka Maeda) 20230302.8260 <151c (Yutaka Maeda) 20230302.8287 167C (Masayuki Moriyama)

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