[vsnet-alert 26119] Re: ASASSN-21nj: new SU UMa-type dwarf nova

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

ASASSN-21nj  (UGSU)
https://www.aavso.org/vsx/index.php?view=detail.top&oid=2223405

Slight rebrightening since 2021 July 31 in recent ASAS-SN Sky Patrol data:
https://asas-sn.osu.edu/sky-patrol/coordinate/8623dccc-28f2-4e22-bfef-0bdfc66f458c

The fading seems to have stopped also in ZTF data:
https://lasair.roe.ac.uk/object/ZTF21abmemav/

The same phenomenon also recorded in ATLAS data.

Further time-resolved photometry is encouraged.

Clear skies,
Patrick
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References:
All-Sky Automated Survey for Supernovae (ASAS-SN) Sky Patrol:
- Shappee et al., 2014ApJ...788...48S
- Kochanek et al., 2017PASP..129j4502K
Asteroid Terrestrial-impact Last Alert System (ATLAS):
- Tonry et al., 2018PASP..130f4505T
Lasair:
- Smith et al., 2019RNAAS...3...26S
Zwicky Transient Facility (ZTF):
- Masci et al., 2019PASP..131a8003M
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Am Sonntag, 1. August 2021, 16:01:56 MESZ hat Yusuke TAMPO Folgendes geschrieben:

ASASSN-21nj: new SU UMa-type dwarf nova

Berto Monard and Itoh-san have reported the time-resolved observations of
ASASSN-21nj. While the observations on 24th to 27th July did not show evident
variations, the observations on 30th and 31st July showed superhumps with a
period of 0.0620(1) d and an amplitude of 0.15 mag.
Therefore ASASSN-21nj is a SU UMa-type dwarf nova.

Best,
Yusuke