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

[vsnet-alert 26797] ASASSN-22ho: new SU UMa-type dwarf nova

by tonny.vanmunster＠gmail.com

Dear colleagues, I have just finished analysing my unfiltered CCD observations of ASASSN-22ho, obtained on 2022, June 02/03 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. Regular superhumps with an amplitude of 0.35 mag are very clearly visible in the resulting light curve, establishing ASASSN-22ho as a new SU UMa-type dwarf nova. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined (long) superhump period of 0.0902 +/- 0.0025d. The object was at mag CV = 16.5 on Jun 03rd. 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 PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com

6 months, 1 week

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[vsnet-alert 26865] TCP J22561804+4109534: new WZ Sge-type dwarf nova

by tonny.vanmunster＠gmail.com

Dear colleagues, I have just finished analysing my unfiltered CCD observations of TCP J22561804+4109534, obtained on 2022, July 04/05 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-286M CMOS camera under clear skies. I have been observing this object during multiple nights between June 27th and now. On all previous nights, no obvious modulations were visible in the light curve, except for last night when superhumps with an amplitude of 0.14 mag became very clearly visible. A period analysis using the ANOVA, Lomb-Scargle, Generalized-Lomb-Scargle and PDM methods (Peranso 3.0), yields a combined superhump period of 0.0650 +/- 0.0011d. The object was at mag CV = 15.3 on Jul 05th. The superhump profile shows no signs of a double-waved pattern, and I could not detect early superhumps in my data. Yet, the large outburst amplitude of ~7.4 mag, and the long time for superhumps to develop (approx. 9 days) make this a very likely WZ Sge-type dwarf nova. Follow-up observations are recommended to further track the evolution of the superhumps. 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 PERANSO : The Light Curve and Period Analysis Software http://www.peranso.com ____________________________________________________________ Center for Backyard Astrophysics (CBA) mailing lists https://cbastro.org/communications/mailing-lists/

8 months, 1 week

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[vsnet-alert 26921] TCP J08182007+4413553 = AT 2022sqd = ZTF22abedept

by Naoto Kojiguchi

TCP J08182007+4413553 = AT 2022sqd = ZTF22abedept Large outburst amplitude of 7.7 mag. TCP J08182007+4413553 2022 08 30.4171* 08 18 20.07 +44 13 55.3 15.0 C Lyn 0 0 http://www.cbat.eps.harvard.edu/unconf/followups/J08182007+4413553.html 2022 08 30.4171 Discovered by B.Kumar (Golden Ears Observatory Transient Survey - GEOTS) at Golden Ears Observatory, Maple Ridge, BC, Canada, in three 30-second unfiltered exposures using a 0.36-m f/2 Schmidt-Cassegrain + CCD, with magnitude 15.0 under limiting magnitude 18.0. Nothing is visible at this position on archival images taken on 2022 August 22.4670 UT (limiting mag 18.0). Discovery and Reference images can be found here: https://www.wis-tns.org/system/files/uploaded/GEOTS/tns_2022sqd_atrep_15639… TNS: https://www.wis-tns.org/object/2022sqd SDSS12: 081820.08 +441355.1 SDSSJ081820.08+441355.1 u=24.134(0.705) g=22.727(0.147) r=23.819(0.416) i=23.658(0.536) z=22.175(0.501) ZTF alert: https://lasair-ztf.lsst.ac.uk/object/ZTF22abedept https://alerce.online/object/ZTF22abedept https://mars.lco.global/?objectId=ZTF22abedept https://fink-portal.org/ZTF22abedept MPChecker: NO DATA TCPJ08182007+4413553 20220828.635 <15.700g ASN TCPJ08182007+4413553 20220829.635 14.472g ASN TCPJ08182007+4413553 20220830.4171 15.0C GEOTS TCPJ08182007+4413553 20220830.500 15.2r (ZTF Alert)

9 months, 1 week

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[vsnet-alert 26920] V507 Cyg: IW And-type dip following standstill

by Taichi Kato

V507 Cyg: IW And-type dip following standstill YYYYMMDD(UT) mag observer 20220719.6701 154C (Masayuki Moriyama) 20220721.7590 15.39C (Masayuki Moriyama) 20220722.8024 154C (Masayuki Moriyama) 20220723.7856 152C (Masayuki Moriyama) 20220725.8145 154C (Masayuki Moriyama) 20220726.7538 154C (Masayuki Moriyama) 20220728.5754 153C (Masayuki Moriyama) 20220801.6220 153C (Masayuki Moriyama) 20220805.7024 153C (Masayuki Moriyama) 20220807.7518 <140C (Masayuki Moriyama) 20220814.7133 <151C (Masayuki Moriyama) 20220818.5427 146C (Masayuki Moriyama) 20220821.8101 14.74C (Masayuki Moriyama) 20220822.6953 150C (Masayuki Moriyama) 20220824.7903 157C (Masayuki Moriyama) 20220825.5598 160C (Masayuki Moriyama) 20220826.7249 166C (Masayuki Moriyama) 20220827.6764 161C (Masayuki Moriyama) 20220828.7399 15.70C (Masayuki Moriyama)

9 months, 1 week

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[vsnet-alert 26919] Re: AT2022sfe: likely highly reddened nova

by Taichi Kato

Re: AT2022sfe: likely highly reddened nova Accoring to > https://www.wis-tns.org/object/2022sfe The Gaia object appears to be the northern component of the pair. 200029.264 +345308.30 (2000.0) Gaia_EDR3_2059315910815578496 plx=-(-) dismod=- pmra=-(-) pmdec=-(-) G=21.008 BP=21.178 RP=19.371 The location 20:00:29.256 +34:53:09.14 is very slightly different from this location. A faint object not in Gaia may be outbursting now.

9 months, 1 week

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[vsnet-alert 26918] AT2022sfe: likely highly reddened nova

by Taichi Kato

AT2022sfe: likely highly reddened nova Moriyama-san has pointed out the red color. YYYYMMDD(UT) mag observer 20220827.5919 15.53C (Masayuki Moriyama) 20220828.6528 15.34C (Masayuki Moriyama) 20220828.6559 14.99Rc (Masayuki Moriyama) 20220828.6576 13.51Ic (Masayuki Moriyama) 20220828.6593 <16.39B (Masayuki Moriyama) 20220828.6638 16.92:V (Masayuki Moriyama) See: https://www.wis-tns.org/object/2022sfe The object is located very close to the northern component of a close pair in the PS1 image. The Gaia object appears to be the southern component of the pair. 200029.264 +345308.30 (2000.0) Gaia_EDR3_2059315910815578496 plx=-(-) dismod=- pmra=-(-) pmdec=-(-) G=21.008 BP=21.178 RP=19.371 The outbursting object may not be related to them.

9 months, 1 week

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[vsnet-alert 26917] MASTER OT J001204.00-412337.4: second rebrightening

by Taichi Kato

MASTER OT J001204.00-412337.4: second rebrightening Josch Hambsch detected the second post-superoutburst rebrightening on Aug. 27.

9 months, 1 week

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[vsnet-alert 26916] Gaia22doh

by Taichi Kato

Gaia22doh Likely reddened nova. http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia22doh/ Gaia22doh AT2022sie 2022-08-26 05:03:03 235.24023 -54.59284 16.89 unknown 2022-08-27 20:49:03 Apparently hostless bright red transient

9 months, 1 week

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[vsnet-alert 26915] CRTS J131103.5-414622 outburst

by Taichi Kato

CRTS J131103.5-414622 outburst Large-amplitude outburst. Gaia22dme AT2022rus 2022-08-21 05:13:56 197.76459 -41.77282 14.27 unknown 2022-08-22 16:03:39 outburst in candidate CV SSS 110423:131104-414622 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia22dme/

9 months, 2 weeks

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[vsnet-alert 26914] ASASSN-22jz: revised period of early superhumps

by Taichi Kato

ASASSN-22jz: revised period of early superhumps Using the period of ordinary superhumps, I re-analyzed the data reported in [vsnet-alert 26907]. The correct period of early superhumps was an one-day alias to vsnet-alert 26907. P(ESH)=0.05700(3) d.

9 months, 2 weeks

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vsnet-alert August 2022