Hen 2-442

CONFIRMED MILKY WAY

Constellation
Vulpecula

Equatorial coordinates
α = 19 39 43.350
δ = +26 29 32.910

Galactic coordinates
l = 61.7924°
b = 2.1107°

Suspected	1983^Ref
Confirmed	2014^Ref
Symbiotic IR type	D^Ref
Hot component type	shell-burning^Ref
Outbursts	-

Identifiers

Hen 2-442	IRAS 19376+2622	GSC2.4.2 N2F6088686	AAVSO -
SIMBAD Hen 2-442	Pan-STARRS 139792949306211584	SAO -	VSX -
GAIA DR3 2022052808961769088	SkyMapper -	WRAY -	GCVS -
2MASS J19394335+2629330	HIP -	Hen 2-442	BD -
WISE J193943.35+262932.8	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	-	Belzcyński et al. (2001)	Hen 2-442 (Susp.)
Gaposchkin (1957)	-	Kenyon (1986)	-	Akras et al. (2019)	IPHASJ193943.36+262933.1 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	-

Position

Right ascension (°)	294.9306^Ref	Parallax (mas)	0.498±0.152^Ref	Reddening E(B-V) (mag)	1.66±0.05^Ref ^{, Note}
Declination (°)	26.4925^Ref	Distance (kpc)	3^Ref 2.50^Ref ^{, Note}, 2.47^Ref ^{, Note}
Galactic longitude (°)	61.7924^Ref	Proper motion in α (mas/yr)	-2.91±0.12^Ref
Galactic latitude (°)	2.1107^Ref	Proper motion in δ (mas/yr)	-7.69±0.16^Ref

Observations

X-Ray	-	IR type	D^Ref	Radio	Yes^Ref
X-Ray type	-	J (mag)	11.79^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	9.43^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.35^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	4.86^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	3.03^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	1.13^Ref	IPmax (eV)	99^Ref
B (mag)	17.16^Ref	WISE W4 (mag)	0.33^Ref	[O III] lines	Yes^Ref
V (mag)	15.47^Ref	IRAS 12μm (Jy)	16.10^Ref	He II lines	Yes^Ref
R (mag)	16.14^Ref	IRAS 25μm (Jy)	8.18^Ref	[Fe VII] lines	Yes^Ref
I (mag)	-	IRAS 60μm (Jy)	1.38^Ref	O VI lines	No^Ref
BP (mag)	16.61^Ref	IRAS 100μm (Jy)	29.40^Ref
G (mag)	16.59^Ref	AKARI S09 (Jy)	14.02^Ref
RP (mag)	15.29^Ref	AKARI S18 (Jy)	7.49^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	-	Mass (M_⊙)	-	Pulsation	-
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	-
IR type	D^Ref	Luminosity (L_⊙)	3500^Ref	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)	99000^Ref
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

Symbiotic nature was suggested by Yudin (1983), and subsequent observations revealed a very rich emission line nebular spectrum (Rodríguez-Flores et al., 2014).

References

Rodríguez-Flores, E. R., Corradi, R. L. M., Mampaso, A. et al., 2014, A&A, 567, A49, 2014A&A...567A..49R
Yudin, B. F., 1983, ATsir, 1250, 7, 1983ATsir1250....7Y

Last updated: January 25, 2020