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-7413-4425-9a59-0b54b67c3d…
Precise astrometry, spectroscopy, and multiband (also time-resolved) photometry are urgently required.
Clear skies,
Patrick
Hello all!
2019 Sep. 18.43852 <10.3 TG
Canon EOS 60D, 135 mm, f/5.6, 30 sec., ISO-2000.
Yuzhno-Morskoy (near Nakhodka, Russia).
Faded to gmag. 15.8 on 2019 Sept. 19.10 UT:
https://asas-sn.osu.edu/light_curves/09e3a60d-648b-4e26-bc99-6668c2ef11…
Normal UGSU/UGWZ/... outburst? Very fast (reddened) nova??
Astrometry (or at least a snapshot) is urgently required – two snapshots (V and B) would be even better.
Clear skies,
Patrick
Hi Patrick,
I have 10-60 second exposures in V taken 2019-09-20 UT00:29:41.6 but the VSP comp stars are near saturation .
Let me know if you want the .fit files.
Erik
Hi Erik,
Thanks a lot for your response.
Yes, these FITS files would be very helpful. What is the magnitude limit?
CCD images are mainly needed for precise astrometry of the transient.
Patrick (Schmeer)
Hi Patrick,
It looks like limiting magnitude of each 60 second exposure is around magnitude 17 (S/N 6).
CCD FOV 22.5'X16.9' 0.7"/pixel
altitude approx 20 degrees
Erik
Thanks, Erik. Can you provide a link for your files?
Patrick
I can load the raw .ftp files to Dropbox.
Do you have a Dropbox account?
ejs758 at lumos.net
Erik
ASAS-SN Sky Patrol light curve: https://asas-sn.osu.edu/light_curves/83500888-1156-4677-8b0a-c57ed5e841…
Regards,
Patrick