New Online Database of Symbiotic Variables: PN K4-42

Constellation
Vulpecula

Equatorial coordinates
α = 20 06 40.715
δ = +25 00 11.433

Galactic coordinates
l = 63.6341°
b = -3.8612°

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

Identifiers

PN K4-42	IRAS -	GSC2.4.2 N32E026685	AAVSO -
SIMBAD PN K 4-42	Pan-STARRS 138003016696384416	SAO -	VSX -
GAIA DR3 1833941659497953280	SkyMapper -	WRAY -	GCVS -
2MASS J20064071+2500115	HIP -	Hen -	BD -
WISE J200640.73+250011.5	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 (°)	301.6696^Ref	Parallax (mas)	0.240±0.047^Ref	Reddening E(B-V) (mag)	1.38±0.05^Ref ^{, Note}
Declination (°)	25.0032^Ref	Distance (kpc)	3.42^Ref ^{, Note}, 4.21^Ref ^{, Note}
Galactic longitude (°)	63.6341^Ref	Proper motion in α (mas/yr)	-2.99±0.04^Ref
Galactic latitude (°)	-3.8612^Ref	Proper motion in δ (mas/yr)	-4.00±0.04^Ref

Observations

X-Ray	-	IR type	S?^Ref	Radio	-
X-Ray type	-	J (mag)	8.96^Ref	Flickering	-
GALEX FUV (mag)	-	H (mag)	7.76^Ref	Outbursts	-
GALEX NUV (mag)	-	K (mag)	7.24^Ref	Outburst type	-
IUE	No^Ref	WISE W1 (mag)	6.85^Ref	Jets	-
FUSE	No^Ref	WISE W2 (mag)	7.02^Ref	Resolved nebula	-
U (mag)	-	WISE W3 (mag)	6.80^Ref	IPmax (eV)	-
B (mag)	-	WISE W4 (mag)	6.31^Ref	[O III] lines	-
V (mag)	14.16^Ref	IRAS 12μm (Jy)	-	He II lines	-
R (mag)	16.43^Ref	IRAS 25μm (Jy)	-	[Fe VII] lines	-
I (mag)	-	IRAS 60μm (Jy)	-	O VI lines	-
BP (mag)	17.18^Ref	IRAS 100μm (Jy)	-
G (mag)	13.66^Ref	AKARI S09 (Jy)	0.14^Ref
RP (mag)	12.13^Ref	AKARI S18 (Jy)	-

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	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	-	Radius (R_⊙)	-	Accretion disk	-
Eff. temperature (K)	-	Luminosity (L_⊙)	-
Lower limit (K)	-
Upper limit (K)	-

Links

SIMBAD CDS Portal

Notes

Classified by Allen (1974) as a compact planetary nebula resembling a late-type star (class S), he suggested that most objects in this class are symbiotics or VV Cep-type stars. Labeled as "not PN?" in Acker et al. (1987). Furthermore, identified as a long-period variable by Mowlavi et al. (2018).

References

Acker, A., Chopinet, M., Pottasch, S. R. et al., 1987, A&AS, 71, 163, 1987A&AS...71..163A
Allen, D. A., 1974, MNRAS, 168, 1, 1974MNRAS.168....1A
Mowlavi, N., Lecoeur-Taïbi, I., Lebzelter, T. et al., 2018, A&A, 618, A58, 2018A&A...618A..58M

PN K4-42