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TCP J03005508+1802290: new transient (12.0 mag) in Aries

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SPK
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TCP J03005508+1802290: new transient (12.0 mag) in Aries

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.
--------------------------------------------
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-d0b74a94a25a

K. Stanek
...

Deconinck Michel
Deconinck Michel's picture
+12.6

Thank you for this alert Patrick!

Last night my visual estimation : +12.6 and I did a sketch

Michel

 

File upload: 
lmk
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I notice that the Visual

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

File upload: 
Deconinck Michel
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Hi Mike,

Hi Mike,

it's often the case isn't it ? look also for the other interesting star ASASSN-18abj 

Michel

lmk
lmk's picture
Yes, I see the same effect

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

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