K 4-45

Constellation
Cygnus

Equatorial coordinates
α = 21 35 20.776
δ = +53 47 11.709

Galactic coordinates
l = 96.4348°
b = 1.3237°

Suspected	1987^Ref
Re-classified	1988^Ref
Type	HII region^Ref

Identifiers

K 4-45	IRAS 21336+5333	GSC2.4.2 N2TL185766	AAVSO -
SIMBAD PN K 4-45	Pan-STARRS 172543238366214585	SAO -	VSX -
GAIA DR3 2174213226653776256	SkyMapper -	WRAY -	GCVS -
2MASS J21352079+5347116	HIP -	Hen -	BD -
WISE J213521.04+534711.3	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)	K 4-45 (Conf.)

Position

Right ascension (°)	323.8366^Ref	Parallax (mas)	0.167±0.068^Ref	Reddening E(B-V) (mag)	5.21±0.69^Ref ^{, Note}
Declination (°)	53.7866^Ref	Distance (kpc)	4.82^Ref ^{, Note}, 4.58^Ref ^{, Note}
Galactic longitude (°)	96.4348^Ref	Proper motion in α (mas/yr)	-2.55±0.07^Ref
Galactic latitude (°)	1.3237^Ref	Proper motion in δ (mas/yr)	-2.49±0.07^Ref

Links

SIMBAD CDS Portal

Notes

Initially suspected to be a symbiotic star by Shchelkanova (1987). They detected Hα in emission along with He I, [N II], and [S II], while Hβ or [O III] lines were not detected. It was subsequently included in the catalog of symbiotic stars by Vaidis (1991). However, it was later reclassified as an HII region ionized by an early-B type star (Garnett & Dinerstein, 1988).

References

Bronfman, L., Nyman, L.-A., May, J., 1996, A&AS, 115, 81, 1996A&AS..115...81B
Garnett, D. R., Dinerstein, H. L., 1988, AJ, 95, 119, 1988AJ.....95..119G
Shchelkanova, A. Y., 1987, SvAL, 13, 446, 1987SvAL...13..446S
Vaidis, J.-P., 1991, BAFOE, 55, 21, 1991BAFOE..55...21V