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Latest Details
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| Name |
V1521 Cyg |
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| AAVSO UID |
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| Constellation |
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| J2000.0 |
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| B1950.0 |
20 30 37.69 +40 47 12.5 |
| Galactic coord. |
79.845 +0.700 |
Other names
(Internal only)
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1RXS J203226.2+405725 |
2MASS J20322578+4057279 |
4U 2030+40 |
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Cyg X-3 |
X 20305+407 |
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(Not logged in) Add name
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| Variability type |
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HMXB/BHXB |
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| Spectral type |
WN4/7+BH |
| Mag. range |
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11.4 (1.53) K |
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| Discoverer |
-- |
| Epoch |
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| Outburst |
-- |
| Period |
0.1996907 d (4.79258 h) |
| Rise/eclipse dur. |
-- |
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Remarks
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Some references may be clicked to view in new window. Roll over index number to view submission details.
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1 |
Otero, Sebastian Alberto
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Microquasar. |
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2 |
GCVS Team |
Cyg X-3. Peculiar infrared X-ray source. V > 23m. Flare radio source. In the K band short and slow flares on the time scale about 2 minutes and 1-2 hours, irregular variations and longperiodic variability are observed [E.E.Becklin, F.J.Hawkins, K.O. Mason, K.Matthews, G.Neugebauer, D.Packman, P.W.Sanford, B.Schupler, A.Stark, C.G.Wynn- Williams, ApJ 192, L 119, 1974.]. These variations are accompanied by periodical oscillations of infrared, X-ray and gamma radiation with the elements: Min = 2440949.8986 + 0.1996830d*E + 1.25d*10**(-10)*E**2 [M. van der Klis, J.M.Bonnet-Bidaud, AsAp 95, L5, 1981.]. Usually the amplitude of these variations A(K) = 0.5m, but sometimes they disappear completely. |
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References
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Click reference title/citation to view in new window. Roll over index number to view submission details.
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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 |
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2 |
A description of sources detected by INTEGRAL during the first 4 years of
observations |
2007A&A...467..585B |
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3 |
Catalogue of Stellar Spectral Classifications (Skiff, 2005) |
1996A&A...314..521V |
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4 |
T.C.Weekes, J.G.Geary, PASP 94, 708, 1982. |
1982PASP...94..708W |
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5 |
M.Milgrom, D.Pines, ApJ 220, N1, 272, 1978. |
1978ApJ...220..272M |
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External Links
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Location
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Catalog Data
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Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
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2MASS
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J = 15.31 | H = 13.19 | K = 11.92 | J - K = 3.39 |
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AllWISE
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W1 = 10.65 | W2 = 9.96 | W3 = 8.58 | W4 = 6.32 | W1 - W2 = 0.68 | W3 - W4 = 2.26 |
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SDSS-DR12
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u = 23.36 | g = 25.11 | r = 24.43 | i = 23.32 | z = 19.71 | u - g = -1.75 | r - i = 1.12 |
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Images
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Please review Digitized Sky Survey Acknowledgment and Copyright.
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Supporting Documents
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There are currently no supporting documents on file for this star.
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Revision History
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