October 2021 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[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.

1 0

[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

1 0

[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

1 0

[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).

3 2

[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.

1 0

[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

1 0

[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)

3 2

[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

1 0

[vsnet-alert 26303] GK Per up to now (corrected)
by Taichi Kato 08 Oct '21

08 Oct '21

GK Per up to now (corrected) YYYYMMDD(UT) mag observer 20210918.7347 128cG (Yutaka Maeda) 20210919.1596 12.90C (Masao Funada) 20210920.9097 130 (Eddy Muyllaert) 20210921.969 128 (Gary Poyner) 20210922.7331 129cG (Yutaka Maeda) 20210922.9306 130 (Eddy Muyllaert) 20210923.7340 126cG (Yutaka Maeda) 20210923.9222 129 (Eddy Muyllaert) 20210924.017 129 (Gary Poyner) 20210924.7380 128cG (Yutaka Maeda) 20210925.974 12.98C (Gary Poyner) 20210926.4269 13.73B (Seiichiro Kiyota) 20210926.4273 12.83V (Seiichiro Kiyota) 20210927.9174 130 (Eddy Muyllaert) 20210928.3782 13.92B (Seiichiro Kiyota) 20210928.3786 12.83V (Seiichiro Kiyota) 20210928.7417 128cG (Yutaka Maeda) 20211001.6128 126cG (Yutaka Maeda) 20211001.816 130 (Hiroyuki Maehara) 20211002.6139 126cG (Yutaka Maeda) 20211003.4589 128V (Robert Fidrich) 20211003.528 128 (Hiroyuki Maehara) 20211003.6414 12.42C (Masayuki Moriyama) 20211003.6426 12.55V (Masayuki Moriyama) 20211003.6437 11.90Rc (Masayuki Moriyama) 20211003.6446 11.32Ic (Masayuki Moriyama) 20211003.6465 13.46B (Masayuki Moriyama) 20211003.6498 125cG (Yutaka Maeda) 20211003.776 128V (Pavol A. Dubovsky) 20211003.815 132 (Tsuneo Horie) 20211003.826 129 (Gary Poyner) 20211003.940 12.78V (Jose Prieto) 20211003.9444 108 (Jose Ripero) 20211003.992 12.82C (Gary Poyner) 20211004.6055 128cG (Yutaka Maeda) 20211004.826 132 (Tsuneo Horie) 20211005.038 12.98C (Gary Poyner) 20211005.0384 12.99C (Masao Funada) 20211005.0569 130 (Robert Fidrich) 20211005.5949 128cG (Yutaka Maeda) 20211006.032 130 (Gary Poyner) 20211006.103 129 (Klaus Wenzel) 20211006.5897 127cG (Yutaka Maeda)

2 1

[vsnet-alert 26308] ZTF18abttrrr (polar) outburst
by Taichi Kato 08 Oct '21

08 Oct '21

ZTF18abttrrr (polar) outburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21eni/ Gaia21eni AT2021aath 2021-09-28 00:17:37 261.87116 13.43388 17.97 19.22 0.09 unknown 2021-10-07 22:24:13 ~1.5 mag outburst in Gaia source, previously identified as a polar-type CV

1 0

2024

2023

2022

2021

vsnet-alert October 2021