NSV21190: eclipsing symbiotic star currently undergoing symbiotic nova outburst?
Yamamoto had reported brightening of this object in April.
YYYYMMDD(UT) mag observer
20230422.744 132c (Minoru Yamamoto)
Tadashi Kojima-san has reported that the object has been
bright for months.
object YYYYMMDD(UT) mag code
NSV21190 20230331.758 128c Tko.VSOLJ
NSV21190 20230517.629 128c Tko.VSOLJ
NSV21190 20230617.503 128c Tko.VSOLJ
NSV21190 20230706.553 …
[View More]127c Tko.VSOLJ
This object has been suggested to be a large-amplitude
variable star TerzV910 (suspected to be a Mira star based
on IRAS identification).
ASAS-SN data
https://asas-sn.osu.edu/sky-patrol/coordinate/d5a29922-5bc0-4e1e-824e-086ac…
and ATLAS observations suggest that this object appears
to be an eclipsing symbiotic object, rather than a Mira star,
which became active (at least) in in 2017.
The minima occurred JD 2458240:, 2458660, 2459060:
(P about 410 d?).
The object once became faint in later 2020-later 2021,
and then brightened to the current bright state.
A shallow minimum around JD 2459830 during the present
bright state may be an eclipse (the period then is around
400 d). The object was faint during ASAS-3 observations
(2000-2009). The object is currently slowly brightening
and would be another symbiotic nova (the shallow eclipse
may be explained by a nova photosphere).
The position is somewhat different between 2MASS and Gaia:
2MASS 171453.440 -283746.69 (2000.0) 15.129 12.170 9.707
171453.437 -283746.95 (2000.0) Gaia_DR2_4107611274955676672 plx=-(-) dismod=- pmra=-(-) pmdec=-(-) G=19.526 BP=20.104 RP=17.634
171453.437 -283746.96 (2000.0) Gaia_EDR3_4107611274955676672 plx=2.187(0.418) dismod=8.3 pmra=-6.604(0.411) pmdec=-7.609(0.337) G=19.598 BP=20.516 RP=18.301
I used the 2MASS location.
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