TCP J03005508+1802290 (= ASASSN-18abl)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=625851
"Time received (UT)" for AT 2018jsc: "2018-12-13 02:12:51"
https://wis-tns.weizmann.ac.il/object/2018jsc
Reported earlier (~00:10 UTC) as TCP J03005508+1802290 already:
http://www.cbat.eps.harvard.edu/unconf/followups/J03005508+1802290.html
CCD image by Seiichiro Kiyota: http://meineko.sakura.ne.jp/ccd/TCP_J03005508+1802290.jpg
Spectroscopy and multiband (and time-resolved) photometry are urgently required.
Clear skies,
Patrick
PS:
Re: "Please use ASAS-SN names for ASAS-SN discoveries":
However, for spectroscopically confirmed supernovae please use "SN 20yy..." (mind the gap!) designations.
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Taichi Kato schrieb am Do, 13.12.2018:
[vsnet-alert 22829] (fwd) ASASSN-18abl: very bright outburst
(fwd) ASASSN-18abl: very bright outburst
From: "Stanek, Krzysztof"
Date: Thu, 13 Dec 2018 02:26:18 +0000
ASASSN-18abl – just discovered: bright, dramatic outburst from a star that has never varied before, also posted to TNS: https://wis-tns.weizmann.ac.il/object/2018jsc
Please use ASAS-SN names for ASAS-SN discoveries.
No previous variability: https://asas-sn.osu.edu/light_curves/577fb479-6e90-4308-ae2e-d0b74a94a2…
K. Stanek
...
Thank you for this alert Patrick!
Last night my visual estimation : +12.6 and I did a sketch
Michel
I notice that the Visual observations are running 0.15 to 0.2 brighter than the V observations. This seems a bit unusual, unless this is an emission line star or possible it is extremely blue? It needs some more spectral studies, I think!
Mike
Hi Mike,
it's often the case isn't it ? look also for the other interesting star ASASSN-18abj
Michel
Yes, I see the same effect with that one, and fortunately one observer had a B-V = -0.21 for that, which would seem to explain that difference. I presume then, the same negative B-V for this star? However, nobody yet anything other than V measures.
Mike