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

[vsnet-alert 26946] MASTER OT J053628.39+135341.7: likely superoutburst
by Taichi Kato 29 Sep '22

29 Sep '22

MASTER OT J053628.39+135341.7: likely superoutburst Type from ZTF data. The 2020 Jan. superoutburst had a precursor. YYYYMMDD(UT) mag observer 20220919.4041 16.617zg (ZTF Alert DC mag (Masci+ 2019)) 20220919.4874 16.572zg (ZTF Alert DC mag (Masci+ 2019)) 20220921.4699 16.499zg (ZTF Alert DC mag (Masci+ 2019)) 20220924.4648 16.752zr (ZTF Alert DC mag (Masci+ 2019)) 20220924.5015 16.864zg (ZTF Alert DC mag (Masci+ 2019)) 20220926.4459 17.232zg (ZTF Alert DC mag (Masci+ 2019))

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[vsnet-alert 26945] ASASSN-16cz likely superoutburst
by Taichi Kato 28 Sep '22

28 Sep '22

ASASSN-16cz likely superoutburst Type from ZTF data. The 2020 Oct. superoutburst was followed by a rebrightening.

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[vsnet-alert 26944] RY Sgr fading rapidly
by Taichi Kato 28 Sep '22

28 Sep '22

RY Sgr fading rapidly YYYYMMDD(UT) mag observer 20220814.512 71 (Masashi Nakatani) 20220818.510 71 (Noriaki Onodera) 20220818.510 75 (Masashi Nakatani) 20220819.508 72 (Noriaki Onodera) 20220821.528 73 (Noriaki Onodera) 20220827.6028 8.05V (Masayuki Moriyama) 20220828.500 77 (Noriaki Onodera) 20220830.137 8.01TG (Gary Poyner) 20220831.194 7.78TG (Gary Poyner) 20220831.8785 79 (Jose Ripero) 20220903.201 7.64TG (Gary Poyner) 20220903.8750 74 (Jose Ripero) 20220908.425 72 (Hiroyuki Maehara) 20220912.460 74 (Noriaki Onodera) 20220912.499 72 (Hiroyuki Maehara) 20220916.514 77 (Noriaki Onodera) 20220917.467 78 (Noriaki Onodera) 20220920.8646 84 (Jose Ripero) 20220921.460 80 (Noriaki Onodera) 20220926.451 94 (Noriaki Onodera) 20220926.8646 97 (Jose Ripero)

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[vsnet-alert 26943] V482 Cyg rising
by Taichi Kato 28 Sep '22

28 Sep '22

V482 Cyg rising So I must point again that Jose Ripero did not *know* that the object is already rising. The V-data suggest that the rise took place earlier than most visual observers noticed it. YYYYMMDD(UT) mag observer 20220829.058 13.98V (Gary Poyner) 20220829.9194 140 (Eddy Muyllaert) 20220829.962 139 (Gary Poyner) 20220830.971 138 (Gary Poyner) 20220831.5184 13.65V (Seiichiro Kiyota) 20220831.5189 12.65Rc (Seiichiro Kiyota) 20220831.5193 11.59Ic (Seiichiro Kiyota) 20220831.9097 <137 (Jose Ripero) 20220901.940 14.62 (Pavol A. Dubovsky) 20220901.9479 138 (Eddy Muyllaert) 20220903.8993 <137 (Jose Ripero) 20220903.985 14.83 (Pavol A. Dubovsky) 20220904.9243 140 (Eddy Muyllaert) 20220905.4110 12.87V (Minoru Sato) 20220905.9201 <137 (Jose Ripero) 20220907.023 136 (Gary Poyner) 20220907.700 133 (Hiroyuki Maehara) 20220908.983 131 (Gary Poyner) 20220910.016 12.92V (Gary Poyner) 20220910.017 12.52C (Gary Poyner) 20220910.017 12.97TG (Gary Poyner) 20220910.4133 12.78V (Minoru Sato) 20220910.8451 130 (Eddy Muyllaert) 20220910.949 129 (Gary Poyner) 20220914.3975 12.63V (Minoru Sato) 20220915.947 128 (Gary Poyner) 20220916.912 128 (Gary Poyner) 20220917.946 127 (Gary Poyner) 20220918.949 12.85 (Pavol A. Dubovsky) 20220919.8188 128 (Eddy Muyllaert) 20220920.9014 <137 (Jose Ripero) 20220921.923 126 (Gary Poyner) 20220922.065 12.51V (Gary Poyner) 20220923.919 124 (Gary Poyner) 20220924.4302 12.34V (Minoru Sato) 20220924.980 122 (Gary Poyner) 20220926.9014 <137 (Jose Ripero)

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[vsnet-alert 26942] Re: Fwd: GDS_J1830235-135539: a new symbiotic nova in Scutum:
by Kenta TAGUCHI 27 Sep '22

27 Sep '22

Dear Sebastián, Sorry for the late response. It seems the list didn't forward your e-mail for some reason (and I thank Keisuke for forwarding it to me). I apologize we confused you. "Identical" was my mistake and overstatement. Thank you very much for pointing it out. We pointed the telescope to the position of Gaia EDR3 4104372315454847232 (18:30:23.466, -13:55:42.17). I confirmed the object was almost at the center of the IFU (FoV 8.4'' x 8.0''), and therefore the star should prefer > 1) 18 30 23.47 -13 55 42.0 (2.7" away from the GDS position) 2MASS > J18302347-1355421 J= 8.28, H= 6.83, K= 5.87, G= 14.36, BP= 18.30, RP= > 12.72 Best Regards, Kenta On 2022/09/27 15:59, Keisuke Isogai wrote: > 転送シアmス > > > -------- Forwarded Message -------- > Subject: Re: [vsnet-alert 26940] GDS_J1830235-135539: a new symbiotic > nova in Scutum: > Date: Mon, 26 Sep 2022 13:12:14 -0300 > From: Sebastián Otero <sebastian(a)aavso.org> > To: vsnet-alert(a)ooruri.kusastro.kyoto-u.ac.jp, Keisuke Isogai > <isogai(a)kusastro.kyoto-u.ac.jp> > > > > The Pan-STARRS1 image shows nebulosity around the mira variable so > this supports the ID with the symbiotic nova. > Also, the other red star is 5" away from this one, so I assume that > one is not the star that now has a spectrum. > > The statement "The position is identical to that of a known variable > star GDS J1830235-135539" is what is still causing confusion. > Can you please comment? > > Cheers, > Sebastian > > > >> Hello all, >> >> This object really deserves discussion. >> There hasn't been any comment about its identification. Its GDS >> coordinates do not match the position of the actual mira variable. >> >> There are two very red objects 3" away from the GDS position (18 30 >> 23.57 -13 55 39.9) but the closest object in Gaia DR3(1.1" away) is >> none of them and is not a red star. >> >> 18 30 23.63 -13 55 39.2 Gaia DR3 4104372315454096896 - G= 15.29, BP= >> 15.80, RP= 14.43 >> >> Since the GDS variations show the mira-like activity, the catalogue >> entry should indeed be identified as the red variable, but the light >> curve and measured position and surely those of a blend. >> >> The same happens in the ATLAS catalogue, the variable entry is ATO >> J277.5984-13.9275 (LPV - 319/329 d., c= 15.32 - 15.63) at 18 30 >> 23.63 -13 55 39.3, which matches Gaia DR3 4104372315454096896's >> position but the period and type clearly indicates the variable is >> not that one. >> >> The two red objects in 2MASS are (with their Gaia DR3 J2000.0 positions): >> >> 1) 18 30 23.47 -13 55 42.0 (2.7" away from the GDS position) 2MASS >> J18302347-1355421 J= 8.28, H= 6.83, K= 5.87, G= 14.36, BP= 18.30, >> RP= 12.72 >> 2) 18 30 23.54 -13 55 36.9 (2.9" away from the GDS position) 2MASS >> J18302354-1355369 J= 12.06, H= 9.24, K= 8.14, G= 16.50, BP= 19.13, >> RP= 15.08 >> >> There is a third entry in 2MASS at 18 30 23.54 -13 55 37.8 (2MASS >> J18302353-1355377 J= 9.54, H= 8.14, K= 7.21) which is actually a >> blend of the other two (with the flag "photometric confusion") >> >> Star 1) is the actual variable star. It is Gaia DR3 >> 4104372315454847232 (LPV - 322.8 d. G= 12.6 - 14.8). >> It is also OGLE BLG-LPV-264465 (OGLE BLG575.27.48590), classified as >> M with a period of 315.3 d., mean Ic = 12.13 and amplitude 2.89 mag. >> >> So we know which is the mira variable. But is is the nova-like object? >> What about the other red one? >> And what about the bluer star? >> There are also two other stars in Gaia DR3 (without color >> information) which are part of the blend in GDS and ATLAS: >> >> 18 30 23.63 -13 55 41.3 (1.7" away from the GDS position) G= 19.80 >> 18 30 23.75 -13 55 39.3 (2.6" away from the GDS position) G= 17.94 >> >> I agree that a NC-type brightening and a mira variable look >> compatible (and make the identification with the bluer or closer >> objects less likely), but the presence of the other red object casts >> some doubts about the identification. >> I think accurate astrometry is needed here to properly identified the >> outbursting star. >> >> Cheers, >> Sebastian >> -- >> Sebastian Otero >> VSX Team >> American Association of Variable Star Observers >> >> “The mission of the AAVSO is to enable anyone, anywhere, >> to participate in scientific discovery through variable star astronomy” >> >> www.aavso.org >> >> >>> GDS_J1830235-135539: a new symbiotic nova in Scutum: >>> >>> coordinates: 18 30 23.57 -13 55 39.9 >>> >>> ATel #15623: Spectroscopic confirmation of recent brightening of GDS >>> J1830235-135539 as a symbiotic nova and ASASSN-22lk as a large-amplitude >>> dwarf nova >>> https://www.astronomerstelegram.org/?read=15623 >>> VSX:https://www.aavso.org/vsx/index.php?view=detail.top&oid=456166 >>> Light curve and spectrum: >>> www.kusastro.kyoto-u.ac.jp/~kentagch/atel/GDS_J1830235-135539.pdf >>> >>> Clear skies, >>> >>> Robert >> >> > > > -- > Sebastian Otero > VSX Team > American Association of Variable Star Observers > > “The mission of the AAVSO is to enable anyone, anywhere, > to participate in scientific discovery through variable star astronomy” > > www.aavso.org -- ________________________________________________________________ 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 09090536980

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[vsnet-alert 26941] ASASSN-22lj: SU UMa star below the period minimum
by Taichi Kato 27 Sep '22

27 Sep '22

ASASSN-22lj: SU UMa star below the period minimum Josch Hambsch has reported observations. Although nightly coverage was short, the object clearly shows superhumps with an amplitude of 0.09 mag. The period (with aliases) is 0.03761(2) d, indicating that the object is likely an EI Psc star. Observations from different longitudes are desired.

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[vsnet-alert 26940] GDS_J1830235-135539: a new symbiotic nova in Scutum:
by FIDRICH Robert 24 Sep '22

24 Sep '22

GDS_J1830235-135539: a new symbiotic nova in Scutum: coordinates: 18 30 23.57 -13 55 39.9 ATel #15623: Spectroscopic confirmation of recent brightening of GDS J1830235-135539 as a symbiotic nova and ASASSN-22lk as a large-amplitude dwarf nova https://www.astronomerstelegram.org/?read=15623 VSX: https://www.aavso.org/vsx/index.php?view=detail.top&oid=456166 Light curve and spectrum: www.kusastro.kyoto-u.ac.jp/~kentagch/atel/GDS_J1830235-135539.pdf Clear skies, Robert

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[vsnet-alert 26939] ASASSN-22lu
by Naoto Kojiguchi 24 Sep '22

24 Sep '22

ASASSN-22lu ASASSN-22lu --- ------- 5:10:46.97 -43:46:44.3 2022-09-22.24 16.56 SDSS DSS VIZIER ------- CV candidate, matches to DES g=20.9, g>17.6 on 2022-09-21.22, g=16.9 on 2022-09-22.24 051046.938 -434645.084 Gaia_DR2_4812259925999434752 Plx=0.919(0.7772) dismod=10.2 pmRA=2.557(1.803) pmDE=-7.189(1.523) G=20.543(0.019) BP-RP=0.1551 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- 051046.935 -434644.995 Gaia_EDR3_4812259925999434752 Plx=0.7658(0.4284) dismod=10.6 PM=6.146 pmRA=2.153(0.606) pmDE=-5.757(0.525) G=20.34165(0.015978) BP-RP=0.442415 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- 051046.891 -434644.936 GALEXJ051046.8-434644 FUV=21.5825(0.4516) NUV=20.6412(0.1089) 051046.932 -434645.088 DESJ051046.93-434645.0 g=21.4362 r=21.3153 i=21.2731 z=20.8001 Y=21.525 051046.938 -434645.095 DESJ051046.93-434645.0 g=20.8737 r=20.7928 i=20.86 z=20.3535 Y=20.5584 MPChecker NO DATA ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/88c869c3-b8fd-44b4-ad31-0280f… ASASSN-22lu 20220921.231 <16.773g ASN ASASSN-22lu 20220922.244 16.624g ASN ASASSN-22lu 20220922.244 16.706g ASN ASASSN-22lu 20220922.246 <16.787g ASN ASASSN-22lu 20220922.246 16.921g ASN ASASSN-22lu 20220922.247 16.482g ASN ASASSN-22lu 20220922.247 <16.902g ASN ASASSN-22lu 20220922.248 16.950o ATF ASASSN-22lu 20220922.251 16.981o ATF ASASSN-22lu 20220922.276 16.999o ATF ASASSN-22lu 20220922.288 16.880o ATF ASASSN-22lu 20220923.250 <16.460g ASN ASASSN-22lu 20220923.250 <16.919g ASN ASASSN-22lu 20220923.251 <16.403g ASN ASASSN-22lu 20220923.251 <16.858g ASN ASASSN-22lu 20220923.253 <16.505g ASN ASASSN-22lu 20220923.253 <16.912g ASN

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[vsnet-alert 26938] ASASSN-22ly
by Naoto Kojiguchi 24 Sep '22

24 Sep '22

ASASSN-22ly ASASSN-22ly -- ------- 16:23:16.23 -14:12:43.7 2022-09-23 16.19 SDSS DSS VIZIER ------- CV candidate, matches to PS1 g=21.7, g>18.1 on 2022-09-20.75, g=16.7 on 2022-09-22.00, g=16.6 on 2022-09-23.00 162316.272 -141244.866 Gaia_EDR3_4328966708088786688 Plx=--(--) dismod=-- PM=-- pmRA=--(--) pmDE=--(--) G=20.913553(0.057972) BP-RP=0.230354 E(g-r)=-- E(B-V)=-- Ag=-- Ar=-- Ai=-- 162316.281 -141244.148 PS1_DR1_90942458176395674 g=21.6796(0.1868) r=19.372(0.0524) i=--(--) z=--(--) y=--(--) 162316.268 -141244.837 PS1_DR1_90942458178195407 g=21.4808(0.0443) r=21.5214(0.0584) i=21.367(0.0797) z=20.6438(0.0997) y=20.3363(0.1666) 162316.267 -141244.802 SDSSJ162316.26-141244.8 u=21.728(0.176) g=21.575(0.061) r=21.439(0.073) i=21.110(0.084) z=22.298(0.761) MPChecker NO DATA ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/13b34540-5d6b-4d36-80f1-b5b36… #2022 outburst ASASSN-22ly 20220920.760 <16.963g ASN ASASSN-22ly 20220922.002 16.535g ASN ASASSN-22ly 20220922.003 16.555g ASN ASASSN-22ly 20220922.004 16.395g ASN ASASSN-22ly 20220923.006 16.415g ASN ASASSN-22ly 20220923.007 16.436g ASN ASASSN-22ly 20220923.008 16.276g ASN #2008 mini outburst ASASSN-22ly 20080314.330 <14.50V AS3 ASASSN-22ly 20080315.502 19.650C CRT ASASSN-22ly 20080315.507 19.610C CRT ASASSN-22ly 20080315.512 19.430C CRT ASASSN-22ly 20080315.517 19.570C CRT ASASSN-22ly 20080317.356 <14.50V AS3 ASASSN-22ly 20080320.347 <14.50V AS3 ASASSN-22ly 20080323.315 <14.50V AS3 ASASSN-22ly 20080329.370 <14.50V AS3 ASASSN-22ly 20080401.308 <14.50V AS3 ASASSN-22ly 20080404.304 <14.50V AS3 ASASSN-22ly 20080407.298 <14.50V AS3 ASASSN-22ly 20080410.286 <14.50V AS3 ASASSN-22ly 20080413.286 <14.50V AS3 ASASSN-22ly 20080413.418 19.140C CRT ASASSN-22ly 20080413.425 18.980C CRT ASASSN-22ly 20080413.431 19.000C CRT ASASSN-22ly 20080413.438 19.030C CRT ASASSN-22ly 20080415.329 <14.50V AS3 ASASSN-22ly 20080417.284 <14.50V AS3 ASASSN-22ly 20080419.285 <14.50V AS3 ASASSN-22ly 20080426.259 <14.50V AS3 ASASSN-22ly 20080429.302 <14.50:V AS3 ASASSN-22ly 20080502.230 <14.50V AS3 ASASSN-22ly 20080503.386 19.750C CRT ASASSN-22ly 20080503.392 19.500C CRT ASASSN-22ly 20080503.397 19.480C CRT ASASSN-22ly 20080503.403 19.680C CRT ASASSN-22ly 20080504.288 <14.50V AS3 ASASSN-22ly 20080506.360 <14.50V AS3 ASASSN-22ly 20080509.204 <14.50V AS3 ASASSN-22ly 20080511.245 <14.50V AS3 ASASSN-22ly 20080516.205 <14.50V AS3 ASASSN-22ly 20080523.220 <14.50V AS3 ASASSN-22ly 20080525.209 <14.50V AS3 ASASSN-22ly 20080528.366 20.400C CRT ASASSN-22ly 20080528.374 20.370C CRT ASASSN-22ly 20080528.381 20.360C CRT ASASSN-22ly 20080528.388 20.700C CRT ASASSN-22ly 20080529.274 <14.50V AS3 #2013 mini outburst ASASSN-22ly 20130429.465 <14.893V ASN ASASSN-22ly 20130502.536 21.433rP PS1 ASASSN-22ly 20130502.546 21.372rP PS1 ASASSN-22ly 20130502.568 21.470iP PS1 ASASSN-22ly 20130508.491 21.461gP PS1 ASASSN-22ly 20130508.503 21.589gP PS1 ASASSN-22ly 20130516.492 21.513gP PS1 ASASSN-22ly 20130522.425 <16.194V ASN ASASSN-22ly 20130522.427 <16.219V ASN ASASSN-22ly 20130604.316 18.500C CRT ASASSN-22ly 20130604.322 18.400C CRT ASASSN-22ly 20130604.328 18.370C CRT ASASSN-22ly 20130604.334 18.520C CRT ASASSN-22ly 20130609.392 <17.065V ASN #2021 mini outburst ASASSN-22ly 20210106.668 <16.242g ASN ASASSN-22ly 20210115.566 19.316zr ZTF ASASSN-22ly 20210115.568 19.181zr ZTF ASASSN-22ly 20210116.571 19.739zr ZTF ASASSN-22ly 20210116.573 19.410zr ZTF ASASSN-22ly 20210117.371 <16.030g ASN ASASSN-22ly 20210117.373 <15.941g ASN ASASSN-22ly 20210117.374 <15.692g ASN ASASSN-22ly 20210117.558 19.729zr ZTF ASASSN-22ly 20210117.563 19.895zr ZTF ASASSN-22ly 20210117.566 19.846zr ZTF ASASSN-22ly 20210117.568 19.969zr ZTF ASASSN-22ly 20210118.561 20.130zr ZTF ASASSN-22ly 20210118.565 20.050zr ZTF ASASSN-22ly 20210124.361 <16.783g ASN

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[vsnet-alert 26937] ASASSN-22lx
by Naoto Kojiguchi 24 Sep '22

24 Sep '22

ASASSN-22lx Large outburst amplitude of 7.5 mag. Possible WZ Sge-type object. ASASSN-22lx --- ------- 18:57:13.61 -45:57:5.3 2022-09-23.06 14.18 SDSS DSS VIZIER ------- CV candidate, no Vizier match, g>18.7 on 2022-09-21.07, g=15.4 on 2022-09-22.05, g=14.5 on 2022-09-23.05 IDs: [I/353/gsc242] The Guide Star Catalog, Version 2.4.2 (GSC2.4.2) (STScI, 2020) 185713.754 -455704.74 GSC2_SC9H092903 epoch=1976.640 Bj=22.055201 FUV=21.323 NUV=21.860 [II/335/galex_ais] Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017) 185713.808 -455703.72 GALEX_J185713.8-455703 FUV=21.3233(0.1956) NUV=21.8604(0.3036) ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/27947cd5-5a35-4e50-bd67-f0782… ASASSN-22lx 20220919.796 20.527cy ATF ASASSN-22lx 20220921.070 17.394g ASN ASASSN-22lx 20220922.031 15.838o ATF ASASSN-22lx 20220922.054 15.114g ASN ASASSN-22lx 20220923.059 14.413g ASN

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2021

vsnet-alert September 2022