[vsnet-alert 23955] HV And very faint (20-21 mag)

Thu Feb 13 03:46:23 JST 2020

 HV Andromedae (NLVY)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=222

According to the latest Gaia data this "anti dwarf nova" is now extremely faint:
http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19cyj/
ANDHV 20190816.924 18.48G Gaia
ANDHV 20200109.876 19.71G Gaia
ANDHV 20200205.670 20.61G Gaia 
ANDHV 20200205.744 20.48G Gaia

Initially the deep fading of HV And was noticed and announced by me
on 2019 June 7 (see vsnet-alert 23296 below).

Clear skies,
Patrick
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     Am Samstag, 8. Juni 2019, 00:29:34 MESZ hat Patrick Schmeer pasc1312-aavso at yahoo.de via vsnet-alert <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  

 HV Andromedae  (NL)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=222

ASAS-SN Sky Patrol (Shappee et al. 2014ApJ...788...48S
and Kochanek et al. 2017PASP..129j4502K) data and light curves:
https://asas-sn.osu.edu/light_curves/d9d73f86-c42b-408d-a9cd-1aa28f254e05
https://asas-sn.osu.edu/light_curves/5c57a140-f411-4690-9ec0-7334a6452b50

Currently at 17 mag or fainter.
Magnitude range according to VSX: 15.4 - 16.0 CV

Photometric period of 3.368 +/- 0.060 hours
according to https://arxiv.org/abs/1111.0348

Clear skies,
Patrick