ASASSN-15qr possible superoutburst
Known SU UMa star.
YYYYMMDD(UT) mag observer
20210929.1733 15.932zr (Zwicky Transient Facility Lasair (Masci+ 2019))
Dear friends,
Using my private system scraping MARS ( https://mars.lco.global ),
I've just found ZTF21aceijig out as a CV candidate from the public ZTF data.
It's 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/ZTF21aceijig
ALeRCE: https://lasair.roe.ac.uk/object/ZTF21aceijig
MARS: https://mars.lco.global/?objectId=ZTF21aceijig
According to ALeRCE, the position is (RA, Dec) = (01:49:59.397,
+54:39:27.24)
Last non-detections by ZTF:
g > 19.6426 on 2021-09-23.40 (ZTF, 'difference mag' via ALeRCE)
r > 19.9288 on 2021-09-23.44 (ZTF, 'difference mag' via ALeRCE)
Last non-detection by ASAS-SN:
g > 17.124 on 2021-09-27.5628629
First detections by ZTF:
g = 15.694 +/- 0.036 on 2021-09-28.33 (ZTF, 'difference mag' via ALeRCE)
r = 15.865 +/- 0.032 on 2021-09-28.41 (ZTF, 'difference mag' via ALeRCE)
The result of ASAS-SN Sky Patrol:
https://asas-sn.osu.edu/sky-patrol/coordinate/2f155ab7-61ac-4b06-9fb7-68d40…
There are no possible counterparts recorded in 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
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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
Dear colleagues,
I have just finished analysing my time-series observations of ASASSN-21sb,
obtained on 2021, Sep 25/26 and Sep 26/27 at resp. CBA Extremadura
Observatory and CBA Belgium observatory, using 0.40-m telescopes with SX-46
CCD and QHY-268M CMOS camera's.
Regular superhumps with an amplitude of 0.32 mag are clearly visible in the
resulting light curve, establishing ASASSN-21sb 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 0.0589 +/- 0.0003d. The object was at mag CV = 16.2 on
Sep 27th.
I will send my observations to AAVSO, CBA and VSNET for further analysis.
Best regards
Tonny
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Tonny Vanmunster
CBA Belgium Observatory
CBA Extremadura Observatory
http://www.cbabelgium.com
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com
IPHASJ190812.63+045728.1: eclipsing dwarf nova in the period gap
From ZTF data. Porb=0.1056882(3) d.
Eclipse epoch: BJD 2458662.020.
The behavior up to now suggests an SS Cyg star, but
a search for a superoutburst would be interesting.