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.
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
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>
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
MASTER OT J070314.79+202133.9 outburst
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21eij/
Gaia21eij AT2020aayl 2021-09-17 19:11:12 105.81191 20.35932 15.37 18.23 1.50 unknown 2021-09-29 07:53:17 4 mag blue outburst on a Gaia source, previous outbursts in lightcurve, candidate CV
Precursor and superoutburst in 2020 Nov.-Dec. in
ZTF data.
Gaia21eik: likely SU UMa star
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21eik/
Gaia21eik AT2021zxz 2021-09-17 18:25:11 54.66502 53.85891 18.43 19.50 0.32 unknown 2021-09-29 07:55:11 Outburst in Gaia source, previous outburst in lightcurve
Likely superoutburst in 2019 Oct.-Nov. Probably
in combined magnitude in ZTF data.