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

[vsnet-alert 26295] ASASSN-21so: new SU UMa-type dwarf nova
by Taichi Kato 05 Oct '21

05 Oct '21

ASASSN-21so: new SU UMa-type dwarf nova Tamas Tordai has reported observations. The object showed 0.3-mag superhumps. The period appears to be shorter than 0.06 d.

1 0

[vsnet-alert 26291] GK Per up to now
by Taichi Kato 05 Oct '21

05 Oct '21

GK Per up to now YYYYMMDD(UT) mag observer 20210915.9292 130 (Eddy Muyllaert) 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) 20210927.9174 130 (Eddy Muyllaert) 20211001.816 130 (Hiroyuki Maehara) 20211003.4589 128V (Robert Fidrich) 20211003.528 128 (Hiroyuki Maehara) 20211003.776 128V (Pavol A. Dubovsky) 20211003.9444 108 (Jose Ripero) 20211003.992 12.82C (Gary Poyner)

3 2

[vsnet-alert 26285] GK Per (Nova 1901, intermediate polar) in outburst (since Oct. 2)
by Patrick Schmeer 03 Oct '21

03 Oct '21

GK Persei (NA+UG+NLDQ) Orbital period: 1.996803 d White dwarf spin period: 0.0040625 d = 5.85 min = 351 s https://www.aavso.org/vsx/index.php?view=detail.top&oid=25717 Beginning of the brightening noticed yesterday during my regular check of ASAS-SN Sky Patrol data. https://asas-sn.osu.edu/sky-patrol/coordinate/485c8c41-e472-4da9-ab5c-c42c0… I then checked the latest AAVSO data, but the latest observation was (and still is) from 2021 Sept. 30.935 UT: https://app.aavso.org/webobs/results/?star=000-BBG-044 No visual confirmation by me due to bad weather last night. The latest ZTF observation is from 2021 Sept. 14.384 UT: https://lasair.roe.ac.uk/object/ZTF18abnzukj/ The beginning outburst was also noted by Y. Maeda (Oct. 2.613 UT, mag. 126cG; see vsnet-outburst 27777). The previous dwarf nova outburst of GK Per was observed from 2018 August 23 to October 28 (optical peak on Sept. 24, V= 10.1). Follow-up observations (e.g. spectroscopy) are encouraged. Clear skies, Patrick ------- References: All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol: - Shappee et al., 2014ApJ...788...48S - Kochanek et al., 2017PASP..129j4502K Lasair: - Smith et al., 2019RNAAS...3...26S Zwicky Transient Facility (ZTF): - Masci et al., 2019PASP..131a8003M

4 4

[vsnet-alert 26284] FW: T Pyx Further Observations
by Peter Williams 03 Oct '21

03 Oct '21

Hello, Just for info, I received he below from “Rose91” masquerading as vsnet alert. Please be aware & be careful. Tks. Peter Williams Heathcote NSW From: vsnet alert [mailto:rose91@fit.indyasa.com] Sent: Friday, 1 October 2021 11:51 PM To: Peter F Williams <pfwilliams(a)onaustralia.com.au> Subject: Re: [vsnet-alert 13158] T Pyx Further Observations Good day. Please look for important information and tell me the results. Beneath I send the legal request. https://multasuy.com/cupiditate-enim/et.zip Hi All, I have made the following additional observations here at Heathcote (30cm Newtonian) just before the clouds rolled in: PYXT 20110414.515 114 WPX PYXT 20110414.520 114 WPX Tks and regards Peter Williams Heathcote NSW _____ <https://www.avg.com/internet-security> This email has been checked for viruses by AVG antivirus software. www.avg.com <https://www.avg.com/internet-security>

1 0

[vsnet-alert 26283] ZTF21aceejop: another CV candidate? (g = 15.7, r = 16.0)
by Kenta TAGUCHI 01 Oct '21

01 Oct '21

Dear friends, Using my private system scraping MARS ( https://mars.lco.global ), I've just found ZTF21aceejop out as a CV candidate from the public ZTF data. Its amplitude is > ~ 6.0 mag (assuming the limiting mag of PS1-g is 21.6). (I'm sorry if someone has already discovered and reported it elsewhere.) Lasair: https://lasair.roe.ac.uk/object/ZTF21aceejop (The page has not existed now) ALeRCE: https://alerce.online/object/ZTF21aceejop MARS: https://mars.lco.global/?objectId=ZTF21aceejop According to ALeRCE, the position is (RA, Dec) = (07:45:50.452, +56:15:28.07) The result of ASAS-SN Sky Patrol: https://asas-sn.osu.edu/sky-patrol/coordinate/25c2fb07-72d2-457b-8cc7-a4560… It also confirms the present outburst. It looks there are no past outbursts recorded. Last non-detection by ZTF: r > 19.7033 on 2021-09-26.51 (ZTF, 'difference mag' via ALeRCE) First detections by ASAS-SN: g = 15.422 on 2021-09-29.5728358 g = 15.508 on 2021-09-29.5740966 g = 15.444 on 2021-09-29.5753592 First detections by ZTF: g = 15.665 +/- 0.029 on 2021-09-30.47 (ZTF, 'difference mag' via ALeRCE) r = 15.974 +/- 0.028 on 2021-09-30.50 (ZTF, 'difference mag' via ALeRCE) The object is ~ 2'' north of WISEA J074550.52+561525.6, which is r = 21.2 according to the PS1 mean object catalog. No known minor planets are found by the Minor Planet Checker ( https://www.minorplanetcenter.net/cgi-bin/checkmp.cgi ). Best Regards and Clear Skies, Kenta -- ________________________________________________________________ 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 <mailto:kentagch@kusastro.kyoto-u.ac.jp> 09090536980

1 0