[vsnet-alert 25345] Re: HV Cet: long-term brightening (from Gaia alert)

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

 HV Ceti
https://www.aavso.org/vsx/index.php?view=detail.top&oid=184509
 
During my regular checks of ZTF Lasair data
I had noticed already in 2020 December and
2021 January a somewhat brighter state (also
noticeable in the images on the LASAIR page).
However, judging from Gaia data (made
publicly available only today) a gradual
brightening since 2020 August or September
is evident. According to the latest Gaia and
ZTF observations (obtained on February 6
and 8) HV Cet is now brighter than at the
optical peak (Gmag. 18.5) around 2018
September 16 (see also the links in Y.
Tampo's message below).
 
Btw, for the ASAS-SN Sky Patrol (Shappee
et al. 2014ApJ...788...48S and Kochanek
et al. 2017PASP..129j4502K) HV Cet is not
yet bright enough to be detected:
https://asas-sn.osu.edu/sky-patrol/coordinate/aa478dd3-b94b-418b-86c2-3596604130d1
 
Follow-up observations are encouraged
(let's see whether this is a new eruption
or not).
 
Clear skies,
Patrick
-------
     Am Montag, 8. Februar 2021, 15:33:39 MEZ hat 反保雄介 <tampo at kusastro.kyoto-u.ac.jp> Folgendes geschrieben:  
 
 HV Cet: long-term brightening (From Gaia alert)
Gaia alert reported a long-term brightening of a classical nova HV Cet, which erupted in 2008.HV Cet has brightened ~ 2mag in recent half a year.
Gaia21arb, 2021-02-06 12:45:41, type = unknown, RA = 46.494, Dec = 5.787, Histric mag = 19.27, alert mag = 18.08, amplitude = 1.19, comment = 2 mag brightening of HV Cet, identified as a nova and supersoft source in 2008http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia21arb/

Brightening is also seen in ZTF broker lasair.https://lasair.roe.ac.uk/object/ZTF18acvbjaw/

Best,Yusuke