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Possible nova in southern sky

PostPosted: Sun Apr 22, 2018 5:52 pm
by Francois Teyssier
ATEL #11561 ATEL #11561

Title: ASAS-SN Discovery of a Possible Galactic Nova ASASSN-18ix
Author: K. Z. Stanek, C. S. Kochanek, J. V. Shields, T. A. Thompson
(OSU), L. Chomiuk, J. Strader (MSU), B. J. Shappee (IfA-Hawaii), T.
W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales;
MAS), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus)
Posted: 22 Apr 2018; 17:17 UT
Subjects:Optical, Nova

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN,
<a href="">Shappee
et al. 2014</a>), using data from multiple ASAS-SN telescopes, we
detect a new bright transient source, possibly a classical nova, but
it might also be a young, large amplitude outburst of a cataclysmic

Object RA (J2000) DEC (J2000) Gal l (deg) Gal b (deg)
Disc. UT Date Disc. V mag
ASASSN-18ix 18:26:31.10 -46:53:03.3 347.756 -15.482
2018-04-22.35 12.6

ASASSN-18ix was discovered in images obtained on UT 2018-04-22.35
at V~12.6. It is also detected in g-band images taken at 2018-04-22.05

at g~12.9 and UT 2018-04-22.24 at g~12.5, indicating a rapid brightening

of this transient. We do not detect (V>16.7) this object in subtracted

images taken on UT 2018-04-21.39 and before.

We have retrieved image subtraction photometry time series at the
location of ASASSN-18ix. No previous outbursts or variability are
detected at the position of ASASSN-18ix since ASAS-SN started
observing this location in May 2014 (there are artifacts present in
some images from one of the cameras due to shutter issues).

Follow-up observations, especially spectroscopy, are strongly encouraged.

We would like to thank Las Cumbres Observatory and its staff for
their continued support of ASAS-SN. ASAS-SN is funded in part by the
Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio
State University, NSF grant AST-1515927, the Mt. Cuba Astronomical
Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP)

at OSU, the Chinese Academy of Sciences South America Center for
Astronomy (CASSACA), and the Villum Fonden (Denmark).

Password Certification: Krzysztof Stanek (