New Online Database of Symbiotic Variables: NSV 20400

Constellation
Lupus

Equatorial coordinates
α = 15 47 50.755
δ = -32 43 59.364

Galactic coordinates
l = 340.6598°
b = 16.9207°

Suspected	2020^Ref
Confirmed	2021^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

NSV 20400	IRAS -	GSC2.4.2 S9ET000757	AAVSO 000-BNN-733
SIMBAD WRAY 15-1356	Pan-STARRS -	SAO -	VSX 58835
GAIA DR3 6015507731384081664	SkyMapper 154750.76-324359.2	WRAY 15-1356	GCVS -
2MASS J15475076-3243594	HIP -	Hen 3-1102	BD -
WISE J154750.76-324359.3	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	-	Belzcyński et al. (2001)	-
Gaposchkin (1957)	-	Kenyon (1986)	-	Akras et al. (2019)	-
Boyarchuk (1969)	-	Vaidis (1988, 1991)	-

Position

Right ascension (°)	236.9615^Ref	Parallax (mas)	0.119±0.042^Ref	Reddening E(B-V) (mag)	0.12±0.0^Ref ^{, Note}
Declination (°)	-32.7332^Ref	Distance (kpc)	6.90^Ref ^{, Note}, 6.14^Ref ^{, Note}
Galactic longitude (°)	340.6598^Ref	Proper motion in α (mas/yr)	-9.68±0.05^Ref
Galactic latitude (°)	16.9207^Ref	Proper motion in δ (mas/yr)	0.17±0.04^Ref

Observations

X-Ray	-	IR type	S^Ref	Radio	-
X-Ray type	-	J (mag)	8.40^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	-	H (mag)	7.50^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.12^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	6.90^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.07^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	6.71^Ref	IPmax (eV)	54.4^Ref
B (mag)	14.15^Ref	WISE W4 (mag)	6.53^Ref	[O III] lines	Yes^Ref
V (mag)	12.90^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	13.43^Ref	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	10.28^Ref	IRAS 60μm (Jy)	-	O VI lines	No^Ref
BP (mag)	13.93^Ref	IRAS 100μm (Jy)	-
G (mag)	11.99^Ref	AKARI S09 (Jy)	0.15^Ref
RP (mag)	10.57^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	895^Ref	γ velocity (km/h)	-95.47±1.33^Ref	Size of giant’s orbit (AU)	-
Eccentricity	-	RV of giant (km/h)	-	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	-	Mass function	-
Eclipses	-			Mass ratio	-
Orbital ephemeris	-

Cool component

Spectral type	S^Ref	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	-
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	-
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

Type/Spectral type	-	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

Symbiotic candidate selected for AAVSO observing campaing (Waagen, 2020) by Adrian B. Lucy (Columbia University). Subsequently confirmed as a symbiotic star by Lucy (2021).

References

Bidelman, W. P., 1991, IBVS, 3617, 1, 1991IBVS.3617....1B
Lucy, A. B., 2021, PhDT, 1, 2021PhDT........17L
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Waagen, E. O., 2020, AAVSO Alert Notice, 708, 1, 2020AAN...708....1W

NSV 20400