ASAS-SN Discovery of a Possible Galactic Nova ASASSN-18cs
ATel #11300; K. Z. Stanek, C. S. Kochanek, J. V. Shields, T. A. Thompson (OSU), T. W.-S. Holoien, B. J. Shappee (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU)
on 14 Feb 2018; 17:55 UT
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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN,
et al. 2014), using data from the quadruple 14-cm "Cassius"
telescope in CTIO, Chile, we detect a new transient source,
possibly a classical nova (could also be a bright CV), near the
Object RA (J2000) DEC (J2000) Gal l (deg) Gal b (deg) Disc. UT Date Disc. V mag
ASASSN-18cs 17:34:08.84 -43:05:50.5 346.74 -5.544 2018-02-13.37 13.7
ASASSN-18cs was discovered in images obtained on UT 2018-02-13.37
at V~13.7, and it is also detected in g-band data from the "Paczynski"
telescope at UT 2018-02-14.38 at g~13.7. There was a ~120-day
seasonal gap before these observations, so the nova candidate could
have peaked already. We do not detect (V>17.4) this object in
subtracted images taken on UT 2017-10-17.03 and before.
We have retrieved V-band image subtraction photometry time series
at the location of ASASSN-18cs. No previous outbursts or variability
are detected at the position of ASASSN-18cs since ASAS-SN started
observing this location in March 2016.
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).