New Online Database of Symbiotic Variables: V2428 Cyg

Constellation
Cygnus

Equatorial coordinates
α = 20 41 19.016
δ = +34 44 52.226

Galactic coordinates
l = 75.9428°
b = -4.4407°

Suspected	1974^Ref
Confirmed	1983^Ref
Symbiotic IR type	S^Ref
Hot component type	shell-burning^Ref
Outbursts	Yes^Ref

Identifiers

V2428 Cyg	IRAS -	GSC2.4.2 N347099190	AAVSO 000-BFR-583
SIMBAD V* V2428 Cyg	Pan-STARRS 149693103291648015	SAO -	VSX 137537
GAIA DR3 1870194997404105856	SkyMapper -	WRAY -	GCVS V2428 Cyg
2MASS J20411901+3444522	HIP -	Hen 2-468	BD -
WISE J204119.01+344452.2	TYC -	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	He2-468 (Conf.)	Belzcyński et al. (2001)	Hen 2-468 (Conf.)
Gaposchkin (1957)	-	Kenyon (1986)	He2-468 (Conf.)	Akras et al. (2019)	Hen 2-468 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	VDS 175 (Conf.)

Position

Right ascension (°)	310.3292^Ref	Parallax (mas)	0.096±0.022^Ref	Reddening E(B-V) (mag)	0.63±0.02^Ref ^{, Note}
Declination (°)	34.7478^Ref	Distance (kpc)	8.20^Ref ^{, Note}, 6.42^Ref ^{, Note}
Galactic longitude (°)	75.9428^Ref	Proper motion in α (mas/yr)	-0.74±0.02^Ref
Galactic latitude (°)	-4.4407^Ref	Proper motion in δ (mas/yr)	-2.36±0.02^Ref

Observations

X-Ray	Yes^Ref	IR type	S^Ref	Radio	No^Ref
X-Ray type	β^Ref	J (mag)	9.40^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	8.31^Ref	Outbursts	Yes^Ref
GALEX NUV (mag)	-	K (mag)	7.95^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	7.78^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.85^Ref	Resolved nebula	No^Ref
U (mag)	-	WISE W3 (mag)	7.50^Ref	IPmax (eV)	114^Ref
B (mag)	16.46^Ref	WISE W4 (mag)	7.11^Ref	[O III] lines	No^Ref
V (mag)	14.73^Ref	IRAS 12μm (Jy)	-	He II lines	Yes^Ref
R (mag)	14.21^Ref	IRAS 25μm (Jy)	-	[Fe VII] lines	No^Ref
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	Yes^Ref
BP (mag)	14.19^Ref	IRAS 100μm (Jy)	-
G (mag)	12.57^Ref	AKARI S09 (Jy)	-
RP (mag)	11.43^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	774^Ref	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	Max (B) = 2440749 + 774 x E^Ref

Cool component

Spectral type	M^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 ARAS Database

Notes

Initially classified as a PN, this object was suspected to have a symbiotic nature by Allen (1974). Subsequent observations by Carrasco et al. (1983) revealed strong H and He lines, a detectable stellar continuum, and O VI lines. Additionally, the object was detected in two outbursts, as reported in Munari & Jurdana-Šepić (2002) and Munari et al. (2014).

References

Allen, D. A., 1974, MNRAS, 168, 1, 1974MNRAS.168....1A
Carrasco, L., Costero, R., Serrano, A., 1983, IAUS, 103, 548, 1983IAUS..103..548C
Luna, G. J. M., Nunez, N., Sokoloski, J. et al., 2015, ATel, 6880, 1, 2015ATel.6880....1L
Munari, U., Dallaporta, S., Castellani, F., 2014, ATel, 6841, 1, 2014ATel.6841....1M
Munari, U., Jurdana-Šepić, R., 2002, A&A, 386, 237, 2002A&A...386..237M
Navarro, S., Costero, R., Serrano P., G. A. et al., 1987, RMxAA, 14, 339, 1987RMxAA..14..339N

V2428 Cyg