V1687 Cyg

MISCLASSIFIED MILKY WAY

Constellation
Cygnus

Equatorial coordinates
α = 20 20 27.969
δ = +43 51 16.257

Galactic coordinates
l = 80.9302°
b = 4.1771°

Suspected	1991^Ref
Re-classified	1981^Ref
Type	Wolf-Rayet star^Ref

Identifiers

V1687 Cyg	IRAS 20187+4341	GSC2.4.2 N2I6000758	AAVSO 000-BCV-759
SIMBAD HD 193793	Pan-STARRS 160623051163956054	SAO 49491	VSX 12607
GAIA DR3 2081261372633822592	SkyMapper -	WRAY -	GCVS V1687 Cyg
2MASS J20202798+4351164	HIP 100287	Hen -	BD +43 3571
WISE J202027.99+435116.0	TYC 3164-1678-1	ESO -	HD 193793

Symbiotic Catalogs

Bidelman (1954)	-	Allen (1984)	-	Belzcyński et al. (2001)	-
Gaposchkin (1957)	-	Kenyon (1986)	-	Akras et al. (2019)	-
Boyarchuk (1969)	-	Vaidis (1988, 1991)	V1687 Cyg (Conf.)

Position

Right ascension (°)	305.1165^Ref	Parallax (mas)	0.538±0.024^Ref	Reddening E(B-V) (mag)	1.2±0.06^Ref ^{, Note}
Declination (°)	43.8545^Ref	Distance (kpc)	1.80^Ref ^{, Note}, 1.79^Ref ^{, Note}
Galactic longitude (°)	80.9302^Ref	Proper motion in α (mas/yr)	-4.28±0.03^Ref
Galactic latitude (°)	4.1771^Ref	Proper motion in δ (mas/yr)	-1.87±0.03^Ref

Links

SIMBAD CDS Portal

Notes

Erroneously included among the confirmed symbiotic stars in the list of Vaidis (1991), this object is, in fact, a long-period, highly eccentric Wolf-Rayet star, as indicated by various studies including Thomas et al. (2021), Fahed et al. (2011), Pollock et al. (2021), and references therein.

References

Fahed, R., Moffat, A. F. J., Zorec, J. et al., 2011, MNRAS, 418, 1, 2, 2011MNRAS.418....2F
Pollock, A. M. T., Corcoran, M. F., Stevens, I. R. et al., 2021, ApJ, 923, 2, 191, 2021ApJ...923..191P
Thomas, J. D., Richardson, N. D., Eldridge, J. J. et al., 2021, MNRAS, 504, 4, 5221, 2021MNRAS.504.5221T
Vaidis, J.-P., 1991, BAFOE, 55, 21, 1991BAFOE..55...21V
van der Hucht, K. A., Conti, P. S., Lundstrom, I. et al., 1981, SSRv, 28, 3, 227, 1981SSRv...28..227V

Last updated: March 18, 2022