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Cheers
Robin

-----Original Message-----
From: vsnet-alert <vsnet-alert-bounces@ooruri.kusastro.kyoto-u.ac.jp> On Behalf Of Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert
Sent: 12 June 2021 17:09
To: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp; vsnet-newvar@ooruri.kusastro.kyoto-u.ac.jp; cvnet-outburst@groups.io; baavss-alert@groups.io
Subject: [vsnet-alert 25957] TCP J18573095+1653396: bright probable nova (mag. 6.4) in Hercules

TCP J18573095+1653396 = ZTF19aasfsjq (N:) (submitted to VSX)

Discovered on 2021 June 12.537 UT at mag. 8.4 by Seiji Ueda (Kushiro, Hokkaido, Japan):
http://www.cbat.eps.harvard.edu/unconf/ ... 53396.html

ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF19aasfsjq/

Possibly recorded on the rise (gmag. ~16.3 on June 12.192 UT) by the ASAS-SN Sky Patrol:
https://asas-sn.osu.edu/sky-patrol/coor ... 6b21100256

Source No. 4514092717838547584 in Gaia EDR3 (Gmag. 19.95).

Spectroscopy and multiband photometry are urgently required.

Clear skies,
Patrick

Here is a low resolution R~1000 spectrum of the new bright object in Her, now announced in ATel 14704 as a nova. Taken with a LISA on a 0.28m SCT. This has been instrument and atmospheric response corrected.
David

And here is my Alpy spectrum of Nova Her 2021. I've not seen a spectrum like this before... Cheers
Hugh

Hello all,

Here is my spectrum of the Nova Her 2021 obtained the 13th of June at 1 h 01 TU (resolution of 531, JJ = 2459378.5425) with my Alpy 600 and an acquisition time of 30 min (6 x 300s) : Clear skies to all !!

Christophe BOUSSIN

Very fast nova.
Impressive spectrum.
Rapid evolution of spectrum is expected.

Page created in the new database : https://aras-database.github.io/databas ... r2021.html

François Teyssier

Hello,

That is the Nova Her 2021, from the NOU_T echelle from SMM.

Regards, J.Guarro.

Hello,

A spectrum among the three taken yesterday during the night with my ESHEL from Shelyak : An image of the field (the object is in the hole and very bright) : Must be followed.

Is it always a probably nova or are we sure it is a nova ?

Stéphane

Joan Guarro Flo wrote:Hello,

That is the Nova Her 2021, from the NOU_T echelle from SMM.

Regards, J.Guarro.

Beautiful !

Is it always a probably nova or are we sure it is a nova ?

The spectrum is not usual. It looks like a supernova.
Very fast nova, fast velocity and probably fast evolution.
Thus, massive white dwarf.

A similar spectrum: Nova Sct 1991, probably taken a few days after the maximum (emission components stronger than in the spectra secured last night).
See also V1500 Cyg (Nova Cyg 1975)

Raw spectrum (ongoing acquisition)
Very broad Balmer emissions.

The spectrum tonight looks very different. It is now about 2 magnitudes fainter.

David