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

[vsnet-alert 26321] MGAB-V233 superoutburst
by Taichi Kato 13 Oct '21

13 Oct '21

MGAB-V233 superoutburst SU UMa star with a short supercycle. YYYYMMDD(UT) mag observer 20210819.7185 164C (Masayuki Moriyama) 20210928.6116 152C (Masayuki Moriyama) 20211001.7142 153C (Masayuki Moriyama) 20211007.6637 154C (Masayuki Moriyama) 20211010.6187 153C (Masayuki Moriyama)

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[vsnet-alert 26320] CRTS J014709.7+171520 superoutburst
by Taichi Kato 13 Oct '21

13 Oct '21

CRTS J014709.7+171520 superoutburst YYYYMMDD(UT) mag observer 20211003.7630 <161c (Yutaka Maeda) 20211004.7184 <163c (Yutaka Maeda) 20211005.7076 <167c (Yutaka Maeda) 20211006.7022 <164c (Yutaka Maeda) 20211007.7002 149cG (Yutaka Maeda) 20211008.842 15.24C (Gary Poyner) 20211008.8440 14.77C (Masao Funada) 20211009.3620 15.096zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211009.8576 15.31C (Masao Funada) 20211010.6022 150cG (Yutaka Maeda) 20211011.3231 15.397zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20211011.5900 <140c (Yutaka Maeda)

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[vsnet-alert 26319] PNV J00444033+4113068: new WZ Sge-type dwarf nova
by Taichi Kato 13 Oct '21

13 Oct '21

PNV J00444033+4113068: new WZ Sge-type dwarf nova Tamas Tordai has reported observations. The object showed large-amplitude (0.7 mag!) early superhumps with a period of 0.0553(4) d. This object must have a high inclination and further observations are very encouraged.

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[vsnet-alert 26318] PNV J00444033+4113068 = AT 2021aaxp: galaxtic dwarf nova in the field of M31
by FIDRICH Róbert 12 Oct '21

12 Oct '21

Dear Friends, PNV J00444033+4113068 = AT 2021aaxp: galaxtic dwarf nova in the field of M31 discovered by K. Itagaki. at 16.5 mag (unfiltered) on 2021-10-09.4579. He further reported that it was brightening: 15.7 mag on 2021-10-09.584, and 15.3 mag on 2021-10-09.806 Also, Dave Balam et al. discovered it identically at 17.77 mag (G-Gaia) on 2021-10-09.6125. There is a possible counterpart of g = 22.32 in the PS1 Mean object catalog. More info: http://www.cbat.eps.harvard.edu/unconf/followups/J00444033+4113068.html https://www.wis-tns.org/object/2021aaxp https://www.astronomerstelegram.org/?read=14962 Prediscovery detection by A. Horti-David et al. (Konkoly Obs.): https://www.astronomerstelegram.org/?read=14963 Clear skies, Robert Fidrich HAA/VSS

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[vsnet-alert 26317] ASASSN-21sz
by Taichi Kato 12 Oct '21

12 Oct '21

ASASSN-21sz ASASSN-21sz --- ------- 21:48:30.31 -35:38:49.3 2021-10-7.14 13.56 SDSS DSS VIZIER ------- CV candidate, matches to GAIA DR2 G=18.6, g>17.8 on 2021-10-05.08, g=14.0 on 2021-10-06.11, g=14.1 on 2021-10-07.17, g=14.6 on 2021-10-10.05 ASASSN-21sz 20211005.08 <178g ASN ASASSN-21sz 20211007.17 141g ASN ASASSN-21sz 20211010.05 146g ASN 214830.443 -353848.98 (2000.0) Gaia_DR2_6587981306620492672 plx=2.019(0.320) dismod=8.5 pmra=29.370(0.384) pmdec=-19.011(0.399) G=18.596 BP=18.625 RP=18.304 214830.444 -353848.99 (2000.0) Gaia_EDR3_6587981306620492672 plx=1.926(0.170) dismod=8.6 pmra=29.685(0.155) pmdec=-18.968(0.107) G=18.618 BP=18.722 RP=18.449 214831.2 -353851 (2000.0) 1RXS_J214831.3-353852 0.055 0.39 0.62

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[vsnet-alert 26314] LL And rapid fading
by Taichi Kato 11 Oct '21

11 Oct '21

LL And rapid fading Itoh-san's most recent observation on Sep. 10 indicated that the object faded to 17th mag. Please keep an eye on this object to look for possible rebrightening(s).

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[vsnet-alert 26313] ASASSN-19ax: temporary brightening
by Taichi Kato 09 Oct '21

09 Oct '21

ASASSN-19ax: temporary brightening According to Itoh-san's observations, this object showed a 1-mag brightening on Oct. 4 and 5. Similar two brightenings were apparently present in ASAS-3 and ZTF data during the 2019 Jan. superoutburst. The phenomenon appears to be different from post-superoutburst rebrightenings in WZ Sge (and a few SU UMa) stars.

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[vsnet-alert 26312] ASASSN-14lb: new SU UMa-type dwarf nova
by tonny.vanmunster＠gmail.com 09 Oct '21

09 Oct '21

Dear colleagues, I have just finished analysing my unfiltered CMOS observations of ASASSN-14lb, obtained on 2021, October 08/09 at CBA Belgium Observatory, using a 0.40-m f/10.0 telescope and QHY-268M CMOS camera under clear skies. My observations were triggered by [vsnet-alert 26304]. Regular superhumps with an amplitude of 0.28 mag are clearly visible in the resulting light curve, establishing ASASSN-14lb 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 0.0704 +/- 0.0006d. The object was at mag CV = 16.5 on Oct 09th. 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

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[vsnet-alert 26245] LL And outburst
by Taichi Kato 09 Oct '21

09 Oct '21

LL And outburst Of course, this is a top-priority target! The 2004 superoutburst occurred in June and no good observations were reported. See https://ui.adsabs.harvard.edu/abs/2004PASJ...56S.135K/abstract for the 1993 superoutburst. Determination of the superhump period is very important. YYYYMMDD(UT) mag observer 20210908.9111 <139 (Eddy Muyllaert) 20210909.701 <153 (Hiroyuki Maehara) 20210909.9424 <146 (Eddy Muyllaert) 20210910.219 <17.90C (Gary Poyner) 20210910.9257 <146 (Eddy Muyllaert) 20210910.9375 <146 (Jose Ripero) 20210911.9299 <146 (Eddy Muyllaert) 20210914.901 128C (Jeremy Shears)

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[vsnet-alert 26310] PGIR21git: a highly reddened galactic nova
by FIDRICH Róbert 09 Oct '21

09 Oct '21

Dear Friends, On Sunday, Oct. 3 there was ATel #14950 posted about Palomar Gattini-IR NIR detection and classification of a young, highly reddened Galactic classical nova PGIR21git / AT2021aadi / Gaia21ejq PGIR21git was first detected in the Gattini data processing pipeline on UT 2021-09-19 at a J magnitude of 12.83 +/- 0.27 AB mag, at J2000 coordinates of RA 18:00:44.85 Dec -21:39:41.46 https://www.astronomerstelegram.org/?read=14950 * * * I managed to make 2x120s I, R and V-band images remotely with a 0.51m http://iTelescope.net reflector at Siding Spring, AU on October 4.4128UT. The nova was still quite bright on the I-band images. https://twitter.com/fidusz/status/1445134503463329798 PGIR21git 2021 10 04.4148 13.997I (0.016) FID PGIR21git 2021 10 04.4206 16.490R (0.013) FID PGIR21git 2021 10 04.4206 <18.0V FID the photometry is average of 2x120s I, R-band and V-band images, respectively. Indeed a highly reddened nova. Follow-up photometry with I and R-band filters is recommended. Clear skies, Robert Fidrich HAA/VSS

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