[vsnet-alert 24199] CSS J181252.2+330406 in outburst now
Denis Denisenko firstname.lastname@example.org via vsnet-alert
vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp
Sat Apr 18 22:19:26 JST 2020
This unusual CV in Hercules is now definitely brighter than its 17.7 Gmag
western neighbor, while it was only marginally detectable on Apr. 03 image
with the same T11 instrument in Mayhill, NM (3x60-sec unfiltered exposures
with 0.50-m reflector + CCD).
20200403.474 <188CV T11
20200418.441 16.26CV T11 Outburst!
Visual inspection of ZTF image from Apr. 17 confirms the outburst has not
yet started 24 hours ago. Real-time ZTF Lasair data with the crops of
recent images: https://lasair.roe.ac.uk/object/ZTF18aajsdfc/
20200417.465 17.46g ZTF Lasair (last image in the faint state)
In [vsnet-alert 24132] Taichi Kato wrote:
> According to ZTF and Gaia data, this object
> (=CSS160406:181252+330407) is essentially a CV in low state.
> Deep fading in 2018 June-Aug.
> The Mv at maximum is too faint for a dwarf nova.
Gaia DR2 has BP-RP=0.0193 and Mabs=9.1 (Gmag=18.12, distance modulus
m-M=9.04). Magnitude at outburst corresponds to M=+7.2.
Here is the light curve from ZTF DR2 (Masci et al., 2019PASP..131a8003M):
And the zoomed view in April-June 2018:
Pretty exotic! Perhaps VSX range should be revised to reflect the minimum
magnitude from ZTF (19.6g). CRTS data were likely contaminated by the
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