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

[vsnet-alert 26524] ASASSN-22an is a dwarf nova
by Kirill Sokolovsky 13 Jan '22

13 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 26515] TU Tri superoutburst
by Taichi Kato 09 Jan '22

09 Jan '22

TU Tri superoutburst YYYYMMDD(UT) mag observer 20211231.5329 <165c (Yutaka Maeda) 20220102.6834 <154C (Masayuki Moriyama) 20220102.805 <149 (Gary Poyner) 20220103.5374 <165c (Yutaka Maeda) 20220104.4894 145:cG (Yutaka Maeda) 20220104.4894 145:cG (Yutaka Maeda) 20220104.833 147 (Gary Poyner) 20220105.817 148 (Gary Poyner) 20220106.5390 149cG (Yutaka Maeda) 20220107.5108 <144c (Yutaka Maeda) 20220107.921 151: (Gary Poyner)

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[vsnet-alert 26514] EF Peg superoutburst up to now
by Taichi Kato 09 Jan '22

09 Jan '22

EF Peg superoutburst up to now YYYYMMDD(UT) mag observer 20211227.417 <130 (Tsuneo Horie) 20211228.372 <130 (Tsuneo Horie) 20211230.410 116 (Tsuneo Horie) 20211231.406 112 (Tsuneo Horie) 20211231.4368 113cG (Yutaka Maeda) 20220101.4006 11.40C (Masayuki Moriyama) 20220101.408 112 (Tsuneo Horie) 20220102.407 113 (Tsuneo Horie) 20220102.4192 113C (Masayuki Moriyama) 20220103.405 112 (Tsuneo Horie) 20220103.4440 115cG (Yutaka Maeda) 20220103.4440 115cG (Yutaka Maeda) 20220103.4501 115C (Masayuki Moriyama) 20220103.857 11.81C (Gary Poyner) 20220104.401 112 (Tsuneo Horie) 20220105.399 116 (Tsuneo Horie) 20220105.826 11.73C (Gary Poyner) 20220105.8264 11.70C (Eddy Muyllaert) 20220106.4149 11.66C (Masayuki Moriyama)

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[vsnet-alert 26513] 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-alert 26512] 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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