[vsnet-alert 23562] ASASSN-19wu: new transient (14.3 mag) in Scorpius

[Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert]

ASASSN-19wu  (N:/UG:)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=945689

Nova or CV near the galactic plane, rapid rise,
matches to PS1 g=17.8,
g>16.8 on 2019-09-15.85, g=17.2 on 2019-09-16.11,
g=15.7 on 2019-09-17.10, g=14.3 on 2019-09-17.79.
http://www.astronomy.ohio-state.edu/~assassin/transients.html

ASASSN-19wu 20190915.85 <168g ASN
ASASSN-19wu 20190916.11  172g ASN
ASASSN-19wu 20190917.10  157g ASN
ASASSN-19wu 20190917.79  143g ASN

For a dwarf nova with a short orbital period
this would be a relatively slow rise, so this
transient may be a nova eruption or an SS Cyg-
type dwarf nova outburst.

No previous eruptions or outbursts were recorded
since 2016 March 10 in ASAS-SN Sky Patrol data
(Shappee et al. 2014ApJ...788...48S and Kochanek
et al. 2017 PASP..129j4502K):
https://asas-sn.osu.edu/light_curves/f962a5ee-7413-4425-9a59-0b54b67c3d7b

Precise astrometry, spectroscopy, and multiband
(also time-resolved) photometry are urgently
required.

Clear skies,
Patrick