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Details for Revision 3
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Name
  V1357 Cyg  
AAVSO UID
000-BCJ-914 (1581 observations)  
Constellation
Cygnus Sequence
J2000.0
19 58 21.68 +35 12 05.8  (299.59033 +35.20161) Search nearby
B1950.0 19 56 28.94 +35 03 54.5
Galactic coord. 71.335 +3.067
Other names

(Internal only)
1RXS J195821.9+351156 4U 1956+35 AAVSO 1954+34
BD+34 3815 Cyg X-1 HD 226868
HIP 98298 IOMC 2678000054 SAO 69181
SVS 1808 X 19564+350  
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Variability type
ELL+HMXB
Spectral type O9.7IabpeV
Mag. range
8.72 - 8.93 V
Discoverer --
Epoch
31 Aug 1972 (HJD 2441561.22) Ephemeris
Outburst --
Period 5.599824 d
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto Microquasar. Black hole component. Gamma Ray emitter.
2 GCVS Team Cyg X-1. SB1. The epoch of the inferior conjunction of the optical component is given in the Table. Min II 8.88. The shape of the light curve varies; Min II sometimes are not observed. The periodicity in the light curve variations as well as in polarization changes is possible with P = 78.4d [J.C.Kemp, L.C.Herman, M.S.Barbour, AJ 83, 962-970, 1978., E.A.Karitskaya, Astron. Tsirk. N1088, 1979.]. Rapidly variable X-ray source in wide range up to 3 MeV characterized by the change of high and low states. Light and X-ray variation with P = 294d is also detected [R.K.Manchanda, ApSS 91, N2, 455, 1983., J.C.Kemp, IAU Circ N3780, 1983.]. Variable and flare radio source at 2695 and 8085 MHz.
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References
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1 Corral-Santana, J. M.; Casares, J.; Muņoz-Darias, T.; et al., 2016,
WATCHDOG: A Comprehensive All-sky Database of Galactic Black Hole X-ray
Binaries		 2016ApJS..222...15T
2 J. Alfonso-Garzon, A. Domingo, J.M. Mas-Hesse, A. Gimenez, 2012,
arXiv:1210.0821 [astro-ph.IM] (online info)		 2012arXiv1210.0821A
3 A Multiwavelength Study of Cygnus X-1: The First Mid-infrared Spectroscopic
Detection of Compact Jets		 2011ApJ...736...63R
4 A Multiwavelength Study of Cygnus X-1: The First Mid-infrared Spectroscopic
Detection of Compact Jets		 2011ApJ...736...63R
5 C. Koen, L. Eyer, 2002, MNRAS 331, 45 2002MNRAS.331...45K
6 E.N.Walker, MN 177, 63P, 1975. 1976MNRAS.177P..63W
7 V.M.Lyutyj, Perem. Zvezdy 18, N5, 417, 1972. 1972PZ.....18..417L
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Supporting Documents
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Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
4 Otero, Sebastian Alberto 2018-02-28 02:56 UTC Type and spectral type from 2016ApJS..222...15T. UCAC4 position.
3 Otero, Sebastian Alberto 2011-08-11 20:55 UTC Type from reference.
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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