K 4-2

SUSPECTED MILKY WAY

Constellation
Ophiucus

Equatorial coordinates
α = 18 32 15.157
δ = +07 14 05.191

Galactic coordinates
l = 37.2277°
b = 7.5417°

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

Identifiers

K 4-2	IRAS 18298+0711	GSC2.4.2 N1RZ147291	AAVSO -
SIMBAD PN K 4-2	Pan-STARRS 116682780631712245	SAO -	VSX 147668
GAIA DR3 4477343671973156224	SkyMapper -	WRAY -	GCVS -
2MASS J18321516+0714052	HIP -	Hen -	BD -
WISE J183215.15+071405.2	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 (°)	278.0632^Ref	Parallax (mas)	-0.090±0.089^Ref	Reddening E(B-V) (mag)	0.3±0.02^Ref ^{, Note}
Declination (°)	7.2348^Ref	Distance (kpc)	8.39^Ref ^{, Note}, 5.23^Ref ^{, Note}
Galactic longitude (°)	37.2277^Ref	Proper motion in α (mas/yr)	-3.76±0.10^Ref
Galactic latitude (°)	7.5417^Ref	Proper motion in δ (mas/yr)	-6.61±0.09^Ref

Observations

X-Ray	-	IR type	S?^Ref	Radio	-
X-Ray type	-	J (mag)	8.25^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	7.24^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	6.80^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	6.51^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	6.12^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	5.34^Ref	IPmax (eV)	-
B (mag)	-	WISE W4 (mag)	4.67^Ref	[O III] lines	-
V (mag)	-	IRAS 12μm (Jy)	0.30^Ref	He II lines	-
R (mag)	15.09^Ref	IRAS 25μm (Jy)	0.34^Ref	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	0.40^Ref	O VI lines	-
BP (mag)	15.75^Ref	IRAS 100μm (Jy)	2.48^Ref
G (mag)	12.75^Ref	AKARI S09 (Jy)	0.31^Ref
RP (mag)	11.07^Ref	AKARI S18 (Jy)	-

Orbit

Orbital period (days)	-	γ velocity (km/h)	52.72±2.74^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	M^Ref	Mass (M_⊙)	-	Pulsation	Yes^Ref
Eff. temperature (K)	-	Radius (R_⊙)	-	Type	Mira^Ref
IR type	S?^Ref	Luminosity (L_⊙)	-	Pulsation period (days)	810.21^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

Classified as a symbiotic star candidate in the HASH Database of PNe (Parker et al., 2016), possibly based on the work of Allen & Glass (1974). It is also identified as a Mira variable according to Heinze et al. (2018).

References

Allen, D. A., Glass, I. S., 1974, MNRAS, 167, 337, 1974MNRAS.167..337A
Heinze, A. N., Tonry, J. L., Denneau, L. et al., 2018, AJ, 156, 5, 241, 2018AJ....156..241H
Parker, Q. A., Bojičić, I. S., Frew, D. J., 2016, JPhCS, 728, 3, 032008, 2016JPhCS.728c2008P

Last updated: March 25, 2022