January 2022 - vsnet-newvar - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-newvar 9031] Re: ASASSN-22an is a dwarf nova
by Taichi Kato 14 Jan '22

14 Jan '22

Re: ASASSN-22an is a dwarf nova Interesting result. The object was bright in 2021 Oct. and it would be difficult to imagine that a dwarf nova outburst last nearly three months (unless they were separate outbursts), and it is still disk-dominated.

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[vsnet-newvar 9030] ASASSN-22ao
by Taichi Kato 11 Jan '22

11 Jan '22

ASASSN-22ao ASASSN-22ao --- ------- 23:16:36.34 50:1:52.2 2022-01-9.11 15.42 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=20.0, g>17.4 on 2021-12-14.16, g=17.1 on 2022-01-07.21, g=15.8 on 2022-01-09.11 ASASSN-22ao 20211214.16 <174g ASN ASASSN-22ao 20220107.21 171g ASN ASASSN-22ao 20220109.11 158g ASN 2MASS 231636.315 +500152.31 (2000.0) 16.293 15.671 16.463 231636.274 +500152.27 (2000.0) Gaia_DR2_1990859453575783680 plx=0.274(0.385) dismod=12.8 pmra=-11.457(0.599) pmdec=-11.396(0.534) G=19.625 BP=19.780 RP=19.140 231636.273 +500152.27 (2000.0) Gaia_EDR3_1990859453575783680 plx=0.566(0.298) dismod=11.2 pmra=-11.471(0.288) pmdec=-10.445(0.254) G=19.612 BP=19.880 RP=19.152 Double outburst in 2018 June-July in ZTF data.

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[vsnet-newvar 9029] ASASSN-22an: possible nova
by Taichi Kato 11 Jan '22

11 Jan '22

ASASSN-22an: possible nova ASASSN-22an --- ------- 15:24:49.56 -57:39:52.7 2022-01-8.34 15.28 SDSS DSS VIZIER ------- possible Nova, very high extinction region, matches to GAIA DR2 G=19.6, g>17.6 on 2021-10-05.74, g=14.6 on 2021-10-08.98, g=15.6 on 2022-01-08.34 ASASSN-22an 20211005.74 <176g ASN ASASSN-22an 20211008.98 146g ASN ASASSN-22an 20210108.34 156g ASN

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[vsnet-newvar 9028] ASASSN-15rj possible superoutburst
by Taichi Kato 09 Jan '22

09 Jan '22

ASASSN-15rj possible superoutburst Relatively rare outburst. YYYYMMDD(UT) mag observer 20211231.5565 <166c (Yutaka Maeda) 20220102.5479 <138c (Yutaka Maeda) 20220103.5609 <165c (Yutaka Maeda) 20220104.5130 <158c (Yutaka Maeda) 20220106.5626 <165c (Yutaka Maeda) 20220107.5363 155:c (Yutaka Maeda)

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[vsnet-newvar 9027] ASASSN-15cl superoutburst
by Taichi Kato 09 Jan '22

09 Jan '22

ASASSN-15cl superoutburst YYYYMMDD(UT) mag observer 20211221.6522 <146c (Yutaka Maeda) 20211222.6448 <153c (Yutaka Maeda) 20211231.5842 <157c (Yutaka Maeda) 20220103.5890 137cG (Yutaka Maeda) 20220106.6914 136cG (Yutaka Maeda) 20220107.6407 136cG (Yutaka Maeda) 20220107.6407 136cG (Yutaka Maeda)

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[vsnet-newvar 9026] ASASSN-22ae still bright
by Taichi Kato 09 Jan '22

09 Jan '22

ASASSN-22ae still bright Large outburst amplitude. YYYYMMDD(UT) mag observer 20220107.6663 13.95V (Masayuki Moriyama) 20220107.6693 13.72B (Masayuki Moriyama) ASASSN-22ae --- ------- 4:57:3.77 -26:50:7.2 2022-01-5.15 13.13 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=16.3, g>18.3 on 2022-01-03.28, g=15.3 on 2022-01-04.04, g=13.4 on 2022-01-05.15. ASASSN-22ae 20220103.28 <183g ASN ASASSN-22ae 20220104.04 153g ASN ASASSN-22ae 20220105.15 134g ASN 045703.804 -265007.10 (2000.0) Gaia_DR2_4880708033817333120 plx=3.344(0.885) dismod=7.4 pmra=4.840(1.326) pmdec=1.360(1.611) G=20.583 BP=19.811 RP=19.787 045703.804 -265007.10 (2000.0) Gaia_EDR3_4880708033817333120 plx=1.884(0.613) dismod=8.6 pmra=3.016(0.587) pmdec=0.502(0.667) G=20.462 BP=20.184 RP=19.837

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[vsnet-newvar 9025] MASTER OT J042609.34+354144.8 superhumps
by Taichi Kato 06 Jan '22

06 Jan '22

MASTER OT J042609.34+354144.8 superhumps Kiyota-san detected large-amplitude superhumps on Jan. 4. Superhumps were apparently growing on Jan. 3.

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[vsnet-newvar 9024] ASASSN-19za possible superoutburst
by Taichi Kato 04 Jan '22

04 Jan '22

ASASSN-19za possible superoutburst Gaia22aau AT2019slj 2022-01-01 15:22:10 350.07709 49.32948 15.14 18.99 0.72 CV 2022-01-03 14:16:29 ~5 mag outburst in confirmed CV ASASSN-19za, spectrum on TNS http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia22aau/ Observations on two nights during the 2019 superoutbursts.

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[vsnet-newvar 9023] MASTER OT J030227.28+191754.5: stage A superhumps, eventually
by Taichi Kato 03 Jan '22

03 Jan '22

MASTER OT J030227.28+191754.5: stage A superhumps, eventually The most recent data by Tonny Vanmunster, Tamas Tordai and Itoh-san have recorded emerging ordinary superhumps since 2021 Dec. 30 -- 32 d after the outburst detection! (The longest record, probably related to the large outburst amplitude). The period of stage A superhumps is 0.0616(2) d (2-d baseline). The period of early superhumps is 0.059851(5) d. The corresponding mass ratio is 0.076(10), which will be updated as more observations become available. This value corresponds to a "borderline" period bouncer. List of observers and numbers of measurements: Code Mode Corr SD Obs OKU B -0.401 0.051 1503 KU1 CV -0.427 0.044 19437 Van CV -0.503 0.022 512 KU1 V -0.281 0.038 8153 Ioh C -0.283 0.050 20707 Trt V -0.291 0.030 358 HaC CV -0.242 0.067 262 KU1 Ic 0.012 0.033 109 KU1 Rc -0.051 0.026 119 KU1 B -0.424 0.024 118 Kis C -0.380 0.060 1812 Vih V -0.282 0.032 242 Vih Ic -0.001 0.030 245 Trt CV -0.207 0.031 1440 RFD V -0.173 0.014 175 OKU C 12.103 0.059 1539 GCH CV -0.457 0.018 7

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[vsnet-newvar 9022] CRTS J045446.8-181214 (super?)outburst (since Dec. 29)
by Patrick Schmeer 02 Jan '22

02 Jan '22

CRTS J045446.8-181214 (UG) https://www.aavso.org/vsx/index.php?view=detail.top&oid=298372 Grzegorz Duszanowicz reports that SSS 130317:045447-181214 is bright (mag. 14.6). According to ASAS-SN Sky Patrol data the outburst started on 2021 December 28 or 29: https://asas-sn.osu.edu/sky-patrol/coordinate/a51092ff-2b3c-45d0-8d88-09d64… ZTF light curve, data, and images (via Lasair): https://lasair.roe.ac.uk/object/ZTF18achtaah/ Time-resolved photometry is encouraged. Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M

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vsnet-newvar January 2022