V420 Hya

CONFIRMED MILKY WAY

Constellation
Hydra

Equatorial coordinates
α = 12 24 32.510
δ = -28 18 55.739

Galactic coordinates
l = 295.7742°
b = 34.1822°

Suspected	2000^Ref
Confirmed	2002^Ref
Symbiotic IR type	S^Ref
Hot component type	accreting-only^Ref
Outbursts	-

Identifiers

V420 Hya	IRAS 12219-2802	GSC2.4.2 S6NK000081	AAVSO 000-BFQ-647
SIMBAD V* V420 Hya	Pan-STARRS 74021861355571927	SAO -	VSX 136572
GAIA DR3 3474793129906938752	SkyMapper 122432.52-281855.7	WRAY -	GCVS V0420 Hya
2MASS J12243251-2818558	HIP -	Hen 4-121	BD -
WISE J122432.49-281855.6	TYC 6693-126-1	ESO -	HD -

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	-	Belzcyński et al. (2001)	CD-27 8661 (Susp.)
Gaposchkin (1957)	-	Kenyon (1986)	-	Akras et al. (2019)	Hen 4-121 (Conf.)
Boyarchuk (1969)	-	Vaidis (1988, 1991)	-

Position

Right ascension (°)	186.1355^Ref	Parallax (mas)	0.547±0.050^Ref	Reddening E(B-V) (mag)	0.05±0.0^Ref ^{, Note}
Declination (°)	-28.3155^Ref	Distance (kpc)	1.68^Ref ^{, Note}, 1.73^Ref ^{, Note}
Galactic longitude (°)	295.7742^Ref	Proper motion in α (mas/yr)	0.33±0.05^Ref
Galactic latitude (°)	34.1822^Ref	Proper motion in δ (mas/yr)	-3.33±0.04^Ref

Observations

X-Ray	No^Ref, Yes^Ref, Yes^Ref	IR type	S^Ref	Radio	Yes^Ref
X-Ray type	β/δ^Ref	J (mag)	5.35^Ref	Flickering	Yes^Ref
GALEX FUV (mag)	16.36^Ref	H (mag)	4.51^Ref	Outbursts	-
GALEX NUV (mag)	15.26^Ref	K (mag)	4.21^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	3.86^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	3.86^Ref	Resolved nebula	-
U (mag)	13.46^Ref	WISE W3 (mag)	3.87^Ref	IPmax (eV)	13.6^Ref
B (mag)	12.01^Ref	WISE W4 (mag)	3.70^Ref	[O III] lines	-
V (mag)	10.37^Ref	IRAS 12μm (Jy)	1.14^Ref	He II lines	-
R (mag)	-	IRAS 25μm (Jy)	0.41^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	0.40^Ref	O VI lines	-
BP (mag)	10.43^Ref	IRAS 100μm (Jy)	1.03^Ref
G (mag)	8.60^Ref	AKARI S09 (Jy)	1.54^Ref
RP (mag)	7.31^Ref	AKARI S18 (Jy)	0.45^Ref

Orbit

Orbital period (days)	763.63±5.89^Ref, 751.4±0.2^Ref	γ velocity (km/h)	-5.91±0.05^Ref, -4.12±1.93^Ref	Size of giant’s orbit (AU)	0.515^Ref, 0.502^Ref
Eccentricity	0^Ref, 0.099±0.004^Ref	RV of giant (km/h)	10.54±0.51^Ref, 10.49±0.03^Ref	Separation (AU)	-
Inclination (°)	-	Inferior conj. of giant (JD)	2449280.49,2449838	Mass function	0.092^Ref, 0.089^Ref
Eclipses	Yes?^Ref			Mass ratio	-
Orbital ephemeris	-

Cool component

Spectral type	S4.6^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	SR^Ref
IR type	S^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	85±1^Ref
Metallicity [Fe/H]	-			Pulsation ephemeris	-

Hot component

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

Links

SIMBAD CDS Portal

Notes

S-type star (Stephenson, 1984). Initially classified as a possible symbiotic star by Belczyński et al. (2000) based on private communication with A. Jorissen. According to Belczyński et al. (2000), the system exhibits a broad Hα profile and blue colors (van Eck & Jorissen, 2002). It is also included in the catalog of eclipsing variables as a potential eclipsing system (Avvakumova et al., 2013). X-ray detection was not reported by Luna et al. (2013).

References

Avvakumova, E. A., Malkov, O. Y., Kniazev, A. Y., 2013, AN, 334, 8, 860, 2013AN....334..860A
Belczyński, K., Mikołajewska, J., Munari, U. et al., 2000, A&AS, 146, 407, 2000A&AS..146..407B
Jorissen, A., Boffin, H. M. J., Karinkuzhi, D. et al., 2019, A&A, 626, A127, 2019A&A...626A.127J
Luna, G. J. M., Sokoloski, J. L., Mukai, K. et al., 2013, A&A, 559, A6, 2013A&A...559A...6L
Merc, J., Beck, P. G., Mathur, S. et al., 2023, arXiv, arXiv:2312.16126, 2023arXiv231216126M
Stephenson, C. B., 1984, PW&SO, 1, 1984PW&SO...3....1S
van Eck, S., Jorissen, A., 2002, A&A, 396, 599, 2002A&A...396..599V

Last updated: January 12, 2024