FT Sge

SUSPECTED MILKY WAY

Constellation
Sagitta

Equatorial coordinates
α = 19 40 54.333
δ = +18 44 48.065

Galactic coordinates
l = 55.1866°
b = -1.9457°

Suspected	1974^Ref
Confirmed	-
Symbiotic IR type	D?^Ref
Hot component type	-
Outbursts	-

Identifiers

FT Sge	IRAS 19386+1837	GSC2.4.2 N26G376523	AAVSO 000-BFD-460
SIMBAD V* FT Sge	Pan-STARRS 130492952263726563	SAO -	VSX 27524
GAIA DR3 1824413016894471808	SkyMapper -	WRAY -	GCVS FT Sge
2MASS J19405433+1844481	HIP -	Hen -	BD -
WISE J194054.34+184447.9	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 (°)	295.2264^Ref	Parallax (mas)	0.269±0.104^Ref	Reddening E(B-V) (mag)	1.13±0.03^Ref ^{, Note}
Declination (°)	18.7467^Ref	Distance (kpc)	3.84^Ref ^{, Note}, 2.44^Ref ^{, Note}
Galactic longitude (°)	55.1866^Ref	Proper motion in α (mas/yr)	-2.33±0.10^Ref
Galactic latitude (°)	-1.9457^Ref	Proper motion in δ (mas/yr)	-5.41±0.10^Ref

Observations

X-Ray	-	IR type	D?^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	6.97^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	5.98^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	5.37^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	4.60^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	3.93^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	3.18^Ref	IPmax (eV)	-
B (mag)	-	WISE W4 (mag)	2.33^Ref	[O III] lines	-
V (mag)	-	IRAS 12μm (Jy)	2.47^Ref	He II lines	-
R (mag)	-	IRAS 25μm (Jy)	1.25^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	0.54^Ref	O VI lines	-
BP (mag)	17.59^Ref	IRAS 100μm (Jy)	29.80^Ref
G (mag)	12.87^Ref	AKARI S09 (Jy)	1.81^Ref
RP (mag)	11.06^Ref	AKARI S18 (Jy)	1.11^Ref

Orbit

Orbital period (days)	-	γ velocity (km/h)	-	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	M7-9^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	Mira^Ref
IR type	D?^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	450.723145^Ref
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

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

Links

SIMBAD CDS Portal

Notes

Classified as a symbiotic star candidate in the HASH Database of PNe (Parker et al., 2016), likely based on the work of Allen (1974). Additionally identified as a Mira variable (Heinze et al., 2018).

References

Allen, D. A., 1974, MNRAS, 168, 1, 1974MNRAS.168....1A
Heinze, A. N., Tonry, J. L., Denneau, L. et al., 2018, AJ, 156, 5, 241, 2018AJ....156..241H
Parker, Q. A., Bojičić, I. S., Frew, D. J., 2016, JPhCS, 728, 3, 032008, 2016JPhCS.728c2008P

Last updated: March 25, 2022