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

[vsnet-alert 26204] TCP J19092450+3041330: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 05 Sep '21

05 Sep '21

Dear colleagues, I have just finished analysing my unfiltered observations of TCP J19092450+3041330, obtained on 2021, September 04/05 at CBA Belgium Observatory (0.40-m f/10.0 telescope, QHY-268M CMOS, clear then clouds) and at CBA Extremadura Observatory (0.40-m f/5.1 telescope, SX-46 CCD, clear skies). Combining both observation sets, regular superhumps with an amplitude of 0.40 mag are clearly visible in the resulting light curve, establishing TCP J19092450+3041330 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 superhump period of 0.0680 +/- 0.0002d. The object was at mag CV = 16.1 on Sep 05th. 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

1 0

[vsnet-alert 26198] SDSS J172102.48+273301.2: AM CVn object with double superoutburst
by Naoto Kojiguchi 05 Sep '21

05 Sep '21

SDSS J172102.48+273301.2: AM CVn object with double superoutburst Taguchi-san has reported the latest outburst of this object detected by ZTF alert. This object will soon show a second superoutburst. SC ~ 9.3 yr. Time-resolved photometry is required. YYYYMMDD(UT) mag observer comment 20210825.323 <16.677g ASN 20210826.196 15.852zr ZLR Start of outburst 20210826.217 15.659g ASN 20210827.277 16.078o ATF 20210827.319 15.813g ASN 20210828.195 15.757zg ZLR 20210828.211 15.764g ASN 20210828.258 16.124zr ZLR 20210829.044 15.935g ASN 20210829.275 16.140cy ATF 20210830.751 <16.748g ASN Start of dip 20210831.208 19.372zg ZLR 20210831.333 19.748o ATF ATF (ATLAS Forced Photometry (Tonry et al. 2018)) ASN (ASAS-SN survey (Shappee+ 2014; Kochanek+ 2017)) ZLR (Zwicky Transient Facility Lasair (Masci+ 2019))

2 1

[vsnet-alert 26200] MASTER OT J052622.61+734629.7: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 04 Sep '21

04 Sep '21

Dear colleagues, I have just finished analysing my unfiltered CMOS observations of MASTER OT J052622.61+734629.7, obtained on 2021, September 03/04 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. Regular superhumps with an amplitude of 0.29 mag are clearly visible in the resulting light curve, establishing MASTER OT J052622.61+734629.7 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 superhump period of 0.0665 +/- 0.0003d. The object was at mag CV = 16.2 on Sep 04th. 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

1 0

[vsnet-alert 26197] ZTF21abwplpy: a CV candidate with large amplitude (> ~ 6 mag)
by Kenta TAGUCHI 03 Sep '21

03 Sep '21

Dear friends, Using my private system scraping MARS ( https://mars.lco.global/ ), I've just found ZTF21abwplpy out as a CV candidate from the public ZTF data. It's amplitude is > ~ 6.0 mag (assuming the limiting mag of PS1-g is 21.6). (I'm sorry if someone has already discovered and reported it.) Lasair: https://lasair.roe.ac.uk/object/ZTF21abwplpy/ ALeRCE: https://alerce.online/object/ZTF21abwplpy MARS: https://mars.lco.global/?objectId=ZTF21abwplpy According to ALeRCE, the position is (RA, Dec) = (19:15:25.637, -13:31:07.56) Last non-detections by ZTF: g > 20.5191 on 2021-08-29.21 (ZTF, 'difference mag' via ALeRCE) First detections by ZTF: g = 15.601 +/- 0.024 on 2021-09-01.17 (ZTF, 'difference mag' via ALeRCE) Second detections by ZTF: r = 16.369 +/- 0.045 on 2021-09-03.23 (ZTF, 'difference mag' via ALeRCE) g = 16.281 +/- 0.030 on 2021-09-03.25 (ZTF, 'difference mag' via ALeRCE) The result of ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/1713e323-474d-437d-aa0b-d65df… It confirms a nearby star is contaminated. There are no possible counterparts recorded in the PS1 mean object catalog. No known minor planets are found by the Minor Planet Checker (https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi). Best Regards and Clear Skies, Kenta -- ________________________________________________________________ 田口健太　(TAGUCHI, Kenta) 京都大学大学院理学研究科宇宙物理学教室 (Department of Astronomy, Graduate School of Science, Kyoto University) kentagch(a)kusastro.kyoto-u.ac.jp <mailto:kentagch@kusastro.kyoto-u.ac.jp> 09090536980

1 0

[vsnet-alert 26196] GV Psc superoutburst
by Taichi Kato 03 Sep '21

03 Sep '21

GV Psc superoutburst YYYYMMDD(UT) mag observer 20210819.8382 <157C (Masayuki Moriyama) 20210827.6968 144cG (Yutaka Maeda) 20210828.3626 14.328zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.4350 14.543zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.7488 146:c (Yutaka Maeda) 20210829.7482 144cG (Yutaka Maeda) 20210830.3472 14.47C (Masao Funada) 20210830.7361 143cG (Yutaka Maeda) 20210831.7216 145cG (Yutaka Maeda)

1 0

[vsnet-alert 26195] MASTER OT J052622.61+734629.7 rare outburst
by Taichi Kato 03 Sep '21

03 Sep '21

MASTER OT J052622.61+734629.7 rare outburst YYYYMMDD(UT) mag observer 20210828.8371 <157c (Yutaka Maeda) 20210829.8363 157:c (Yutaka Maeda) 20210830.8214 157:c (Yutaka Maeda) 20210831.1772 15.96C (Masao Funada) 20210831.8063 153:cG (Yutaka Maeda)

1 0

[vsnet-alert 26194] CRTS J221232.0+160140 possible superoutburst
by Taichi Kato 03 Sep '21

03 Sep '21

CRTS J221232.0+160140 possible superoutburst Superoutburst in 2011 May. Interval too short? YYYYMMDD(UT) mag observer 20210805.7168 <158c (Yutaka Maeda) 20210814.3037 20.013zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210828.7130 <138c (Yutaka Maeda) 20210829.5883 <166c (Yutaka Maeda) 20210831.5707 144:cG (Yutaka Maeda)

1 0

[vsnet-alert 26193] ASASSN-16le superoutburst
by Taichi Kato 03 Sep '21

03 Sep '21

ASASSN-16le superoutburst YYYYMMDD(UT) mag observer 20210827.3213 18.485zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210827.7990 <159c (Yutaka Maeda) 20210828.5421 152cG (Yutaka Maeda) 20210829.3264 15.112zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210829.6670 149cG (Yutaka Maeda) 20210829.9969 15.23C (Masao Funada) 20210831.6486 150:cG (Yutaka Maeda)

1 0

[vsnet-alert 26192] ASASSN-19wz possible superoutburst
by Taichi Kato 03 Sep '21

03 Sep '21

ASASSN-19wz possible superoutburst Past ZTF data suggest an SU UMa star (possible superoutburst in 2020 Nov.). YYYYMMDD(UT) mag observer 20210901.2558 15.276zg (Zwicky Transient Facility Lasair (Masci+ 2019))

1 0

[vsnet-alert 26191] Gaia21ebn
by Taichi Kato 02 Sep '21

02 Sep '21

Gaia21ebn http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21ebn/ Gaia21ebn AT2021xmg 2021-08-30 05:31:01 231.85226 49.65244 15.62 20.80 0.14 unknown 2021-09-01 21:10:07 ~5.5 mag outburst in Gaia source, candidate CV 152724.549 +493908.75 (2000.0) Gaia_DR2_1594504929308679936 plx=1.466(2.309) dismod=9.2 pmra=-29.339(3.569) pmdec=-6.083(2.522) G=20.762 BP=20.771 RP=20.492 152724.548 +493908.75 (2000.0) Gaia_EDR3_1594504929308679936 plx=0.787(1.051) dismod=10.5 pmra=-24.946(1.010) pmdec=-2.408(1.109) G=20.719 BP=20.769 RP=20.379 152724.599 +493908.96 (2000.0) GALEX_DR5_6374961960421690918 NUV=22.040(0.429) FUV=-(-)

1 0

2025

2024

2023

2022

2021

vsnet-alert