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Name
  V1687 Cyg  
AAVSO UID
000-BCV-759 (3966 observations)  
Constellation
Cygnus Sequence
J2000.0
20 20 27.98 +43 51 16.3  (305.11658 +43.85453) Search nearby
B1950.0 20 18 46.78 +43 41 42.9
Proper motion
RA: -4.741 +/- 0.027 mas/yDec: -1.511 +/- 0.025 mas/ySource: Gaia DR1
Galactic coord. 80.930 +4.177
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
1ES 2018+43.6 1RXS J202028.5+435111 2MASS J20202798+4351164
2SXPS 5319 4XMM J202027.9+435116 AAVSO 2017+43
ADS 13736 ALS 11192 BD+43 3571
CDS 1159 DO 38301 GC 28303
GCRV 12706 GSC 03164-01678 Gaia DR3 2081261372633822592
HD 193793 HIP 100287 IRAS 20187+4341
LS III +43 7 MCW 874 MR 107
NSV 13030 PPM 59749 SAO 49491
TIC 193109650 TYC 3164-1678-1 WDS J20205+4351A
WR 140 XMMOM J202027.9+435116 XMMSL2 J202027.9+435110
[KW97] 45-31    
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Variability type
WR
Spectral type WC7pd+O5.5fc
Mag. range
6.78 - 6.95 V
Discoverer --
Epoch
21 Nov 2024 (HJD 2460636.23) Ephemeris
Outburst --
Period 2895.0 d  (7.93 y)
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Dust-forming colliding-wind binary. Dust formation events linked to the binary orbit and occuring near the time of periastron (2023ApJ...951...89L). Eccentricity 0.8993 (2021MNRAS.504.5221T). Sudden infrared brightening by 2.5 mag at 2.3 microns and by 1.3 mag at 10 microns (1979ApJ...234..133H). Orbital elements given in the table.
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References
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1 Lau, R. M.; Wang, J.; Hankins, M. J.; et al., 2023, From Dust to Nanodust:
Resolving Circumstellar Dust from the Colliding-wind Binary Wolf-Rayet 140		 2023ApJ...951...89L
2 Thomas, J. D.; Richardson, N. D.; Eldridge, J. J.; et al., 2021, The orbit
and stellar masses of the archetype colliding-wind binary WR 140		 2021MNRAS.504.5221T
3 Fahed, R.; Moffat, A. F. J.; Zorec, J.; et al., 2011, Spectroscopy of the
archetype colliding-wind binary WR 140 during the 2009 January periastron
passage		 2011MNRAS.418....2F
4 J.A.Hackwell, R.D.Gehrz, G.L.Grasdalen, ApJ 234, 133, 1979. 1979ApJ...234..133H
External Links
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 5.55H = 5.43K = 5.04J - K = 0.51
AllWISE W1 = 3.73W3 = 1.74W4 = 1.53W3 - W4 = 0.21
Images
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Supporting Documents
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Revision History
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3 Otero, Sebastian Alberto 2024-08-26 20:33 UTC Range from GCPD data. Spectral type and orbital elements from 2021MNRAS.504.5221T.
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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