New Online Database of Symbiotic Variables: PN K4-21

Constellation
Aquila

Equatorial coordinates
α = 19 14 30.386
δ = +10 50 45.568

Galactic coordinates
l = 45.1991°
b = -0.1164°

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

Identifiers

PN K4-21	IRAS 19121+1045	GSC2.4.2 N2B4030192	AAVSO -
SIMBAD HaroChavira 58	Pan-STARRS 121012886266695740	SAO -	VSX 70009
GAIA DR3 4309760434680640768	SkyMapper -	WRAY -	GCVS -
2MASS J19143038+1050456	HIP -	Hen -	BD -
WISE J191430.42+105045.7	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 (°)	288.6266^Ref	Parallax (mas)	0.313±0.090^Ref	Reddening E(B-V) (mag)	6.26±0.52^Ref ^{, Note}
Declination (°)	10.8460^Ref	Distance (kpc)	2.255^Ref 3.34^Ref ^{, Note}, 2.16^Ref ^{, Note}
Galactic longitude (°)	45.1991^Ref	Proper motion in α (mas/yr)	-0.37±0.10^Ref
Galactic latitude (°)	-0.1164^Ref	Proper motion in δ (mas/yr)	-3.72±0.09^Ref

Observations

X-Ray	No^Ref	IR type	D?^Ref	Radio	No^Ref
X-Ray type	-	J (mag)	6.09^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	4.67^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	3.84^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	3.41^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	2.58^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	1.86^Ref	IPmax (eV)	-
B (mag)	-	WISE W4 (mag)	0.88^Ref	[O III] lines	-
V (mag)	15.10^Ref	IRAS 12μm (Jy)	7.25^Ref	He II lines	-
R (mag)	16.84^Ref	IRAS 25μm (Jy)	4.60^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	5.11^Ref	O VI lines	-
BP (mag)	17.59^Ref	IRAS 100μm (Jy)	69.60^Ref
G (mag)	12.29^Ref	AKARI S09 (Jy)	6.65^Ref
RP (mag)	10.53^Ref	AKARI S18 (Jy)	4.83^Ref

Orbit

Orbital period (days)	-	γ velocity (km/h)	2.71±20.64^Ref	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	Yes^Ref
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	Mira^Ref
IR type	D?^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	299^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

Originally classified as a compact PN resembling a late-type star (class S) by Allen (1974). The author claimed that most objects in this class are either symbiotic stars or VV Cephei-type stars. The star was also suggested as a long-period variable by 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
Le Bertre, T., Tanaka, M., Yamamura, I. et al., 2003, A&A, 403, 943, 2003A&A...403..943L

PN K4-21