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

[vsnet-alert 26528] ASASSN-22ae is a ugsu type DN
by Berto Monard 14 Jan '22

14 Jan '22

ASASSN-22ae was reported as an object with an outburst amplitude of 3.2 mag on Jan 15. Observations over 4 nights in the period Jan 7 to Jan 13 at CBA KKO, confirm ASASSN-22ae as a ugsu type dwarf nova, showing superhumps of amplitude 0.2CR with a period of 0.06883d +/- 0.00004d. The brightness on Jan 13.9 was around 14.7CR. Berto Monard / CBA KKO Calitzdorp, South Africa

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[vsnet-alert 26527] 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-alert 26526] RZ Leo: short-term variations
by Taichi Kato 14 Jan '22

14 Jan '22

RZ Leo: short-term variations Itoh-san reported observations. The object showed variations and they may have been early superhumps. Observation are encouraged.

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[vsnet-alert 26522] RZ Leo outburst
by Hiroyuki Maehara 14 Jan '22

14 Jan '22

According to Kojima-san, RZ Leo is in outburst. object YYYYMMDD(UT) mag code LEORZ 20220112.791 136c TKo Observer: Tadashi Kojima (Gunma, Japan) Instruments: f.l.=200mm lens + Canon EOS 6D

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[vsnet-alert 26524] ASASSN-22an is a dwarf nova
by Kirill Sokolovsky 14 Jan '22

14 Jan '22

We obtained a medium-resolution spectrum of ASASSN-22an with the 4.1m SOAR telescope and Goodman spectrograph on 2022-01-11 08:31 UT. The spectrum covering 3900-7900 A shows a continuum with superimposed broad Balmer absorption lines. The Halpha shows a narrow emission component on top of the broad absorption. The spectrum is that of a dwarf nova in outburst, not consistent with a classical nova. We also used the SOAR acquisition images to measure the astrometric position of ASASSN-22an relative to the few UCAC3 stars in the field: 15:24:49.52 -57:39:52.8 +/-0.1" J2000 There is no Gaia EDR3 source at this position, but USNO-B1.0 0323-0738701 (R1mag=19.8, Imag=18.4) is located only 0.2" away. A faint (median DECaPS DR1 magnitudes g=23.1, r=22.8) source is visible in DECaPS images 0.3" from the SOAR position. AAVSO VSX record for ASASSN-22an: https://www.aavso.org/vsx/index.php?view=detail.top&oid=2225890 Kirill Sokolovsky, Adam Kawash, Elias Aydi, Jay Strader

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[vsnet-alert 26521] 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-alert 26520] 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-alert 26516] ASASSN-15rj possible superoutburst
by Taichi Kato 10 Jan '22

10 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-alert 26518] ASASSN-22ak: 13.2m dwarf nova in Indus
by Denis Denisenko 10 Jan '22

10 Jan '22

ASASSN-22ak = MASTER OT J225608.75-683610.6 = AT 2022ep ASAS-SN light curve for the last 20 days (Shappee et al., 2014; Kochanek et al., 2017): https://asas-sn.osu.edu/sky-patrol/coordinate/71ac1722-3b66-4ef1-9ee2-2efe3… Discovered at 15.0g on Jan. 07, peaked at about 13.2g on Jan. 08, faded to 13.6 by Jan. 09. Detection by MASTER in Argentina on 2022 Jan. 09.039 UT: https://www.wis-tns.org/object/2022ep Selected photometry: ASASSN-22ak = MASTER OT J225608.75-683610.6 20220106.0797 <171g ASAS-SN last non-detection 20220107.0505 15.00g ASAS-SN (Shappee et al.; Kochanek et al.) 20220107.0530 14.90g ASAS-SN 20220108.0358 13.16g ASAS-SN 20220108.0384 13.20g ASAS-SN 20220109.0387 13.8CV MASTER-OAFA (Lipunov et al., 2010) 20220109.0432 13.8CV MASTER-OAFA 20220109.0674 13.61g ASAS-SN 20220109.0699 13.62g ASAS-SN AAVSO VSX entry: https://www.aavso.org/vsx/index.php?view=detail.top&oid=2225886 Gaia EDR3: 22 56 08.86 -68 36 10.2 Plx=2.17(0.60) mas, pmRA=-10.77(0.55) mas/yr, pmDE=-10.01(0.82) mas/yr Gmag=20.43(1), BPmag=20.40(8), RPmag=20.24(12), BP-RP=0.16 With the minimum of 20.5V, the outburst amplitude is about 7-7.5 magnitudes. Denis Denisenko

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[vsnet-alert 26517] RX Vol possible superoutburst
by Taichi Kato 09 Jan '22

09 Jan '22

RX Vol possible superoutburst YYYYMMDD(UT) mag observer 20220107.3229 15.09C (Eddy Muyllaert) 20220107.3231 15.17C (Masao Funada) 20220107.521 153 (Rod Stubbings)

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vsnet-alert January 2022