HM Sge

Constellation
Sagitta

Equatorial coordinates
α = 19 41 57.079
δ = +16 44 39.692

Galactic coordinates
l = 53.5663°
b = -3.1503°

Suspected	1976^Ref
Confirmed	1979^Ref
Symbiotic IR type	D^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref - SyN^Ref

Identifiers

HM Sge	IRAS 19396+1637	GSC2.4.2 N1UG535993	AAVSO 000-BCH-656
SIMBAD V* HM Sge	Pan-STARRS 128092954876414027	SAO -	VSX 27554
GAIA DR3 4318934003785783680	SkyMapper -	WRAY -	GCVS HM Sge
2MASS J19415708+1644399	HIP -	Hen -	BD -
WISE J194157.07+164439.9	TYC 1602-1636-1	ESO -	HD -

Symbiotic Catalogs

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

Position

Right ascension (°)	295.4878^Ref	Parallax (mas)	0.974±0.103^Ref	Reddening E(B-V) (mag)	0.56±0.02^Ref ^{, Note}
Declination (°)	16.7444^Ref	Distance (kpc)	2.3^Ref, 1.25±0.28^Ref, 1.5^Ref, 3.7^Ref 1.04^Ref ^{, Note}, 1.00^Ref ^{, Note}
Galactic longitude (°)	53.5663^Ref	Proper motion in α (mas/yr)	-0.44±0.09^Ref
Galactic latitude (°)	-3.1503^Ref	Proper motion in δ (mas/yr)	-7.10±0.09^Ref

Observations

X-Ray	Yes^Ref	IR type	D^Ref	Radio	Yes^Ref
X-Ray type	β^Ref, α/β^Ref	J (mag)	7.62^Ref	Flickering	No^Ref
GALEX FUV (mag)	-	H (mag)	6.02^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	4.65^Ref	Outburst type	SyN^Ref
IUE	Yes^Ref	WISE W1 (mag)	1.25^Ref	Jets	Yes^Ref
FUSE	No^Ref	WISE W2 (mag)	-0.43^Ref	Resolved nebula	Yes^Ref
U (mag)	-	WISE W3 (mag)	-0.48^Ref	IPmax (eV)	114^Ref
B (mag)	12.90^Ref	WISE W4 (mag)	-1.81^Ref	[O III] lines	Yes^Ref
V (mag)	11.10^Ref	IRAS 12μm (Jy)	119.00^Ref	He II lines	Yes^Ref
R (mag)	-	IRAS 25μm (Jy)	82.60^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	9.45^Ref	O VI lines	Yes^Ref
BP (mag)	12.18^Ref	IRAS 100μm (Jy)	15.20^Ref
G (mag)	11.95^Ref	AKARI S09 (Jy)	77.78^Ref
RP (mag)	10.94^Ref	AKARI S18 (Jy)	58.06^Ref

Orbit

Orbital period (days)	>32872.5^Ref	γ velocity (km/h)	-	Size of giant’s orbit (AU)	-
Eccentricity	-	RV of giant (km/h)	-	Separation (AU)	50^Ref
Inclination (°)	-	Inferior conj. of giant (JD)	-	Mass function	-
Eclipses	-			Mass ratio	-
Orbital ephemeris	-

Cool component

Spectral type	M7 III^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	5000^Ref, 2600^Ref	Radius (R_⊙)	-	Type	Mira^Ref
IR type	D^Ref	Luminosity (L_⊙)	5000^Ref, 10600^Ref, 1500-2000^Ref	Pulsation period (days)	527±2^Ref
Metallicity [Fe/H]	-			Pulsation ephemeris	Min (J) = 2446856±20 + 527±2 x E^Ref

Hot component

Type/Spectral type	WD^Ref	Mass (M_⊙)	-	Spin period (min)	-
Shell-burning/Accreting-only	shell-burning^Ref	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	80000-120000^Ref, 95000-210000^Ref, 20000^Ref, >250000^Ref	Luminosity (L_⊙)	10000-27000^Ref, 9200^Ref
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal ARAS Database

Notes

In-depth analysis of the system was presented in the study by Goldman et al. (2024).

References

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Brown, L. W., Feibelman, W. A., Hobbs, R. W. et al., 1978, ApL, 19, 75, 1978ApL....19...75B
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