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Latest Details
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Name
  IV Cyg  
AAVSO UID
000-BDN-357 (109 observations)  
Constellation
Cygnus Sequence
J2000.0
19 50 12.30 +34 19 26.5  (297.55125 +34.32403) Search nearby
B1950.0 19 48 18.98 +34 11 46.6
Proper motion
RA: 6.8 +/- 6.0 mas/yDec: 0.4 +/- 6.0 mas/ySource: UCAC4
Galactic coord. 69.719 +4.054
Other names

(Internal only)
AN 321.1929 ASASSN-V J195012.35+341926.5 UCAC2 43841979
USNO-B1.0 1243-0369279    
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Variability type
RRAB
Spectral type A5 III
Mag. range
13.4 - 14.7 p
Discoverer --
Epoch
09 Dec 1968 (HJD 2440200.467) Ephemeris
Outburst --
Period 0.3343322 d  (8.02397 h)
Rise/eclipse dur. 15%  (1.204 h)
Remarks
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1 GCVS Team P var. Max = 2425470.406 + 0.33432871d*E (JD2425300 - 33120) [V.P.Zessewitsch, Stars of RR Lirae Type (in russian), Kiev, 1966.]; Max = 2434122.519 + 0.33433895d*E (JD2432700 - 40200) [A.A.Wachmann, Bergd Abh 6, N1, 1961.]; since JD2440200 - see Table. Shape of the light curve varies: 0.10P <= M - m <= 0.20P.
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References
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1 W. Buscombe, 1999, 14th General Catalogue of MK Spectral Classification ISBN 0-939160-12-9
2 E.P.Belseren, JAAVSO 7, N2, 76, 1978. 1978JAVSO...7...76B
3 G.Mannino, Asiago Contr N19, 1950. --
External Links
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Location    Go   
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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 = 12.42H = 12.06K = 11.95J - K = 0.47
AllWISE W1 = 11.90W2 = 11.95W3 = 12.13W1 - W2 = -0.04
APASS-DR9 B = 15.21V = 14.45g' = 14.59r' = 13.99i' = 13.67B - V = 0.76
Images
Please review Digitized Sky Survey Acknowledgment and Copyright.
Size 5' x 5' (297 x 298 pixels)
Center 19 50 12.30 +34 19 26.5 (J2000)
Source STScI
Survey

Red, all sky, 1.0 arcsec/pixel
  Negative
Supporting Documents
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Stellar Association Membership
 ASCC 109 Open Cluster 2012A&A...548A..97Z
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
2 Wils, Patrick 2007-04-22 01:30 UTC Spectral type added. Position from UCAC2.
1 Admin, VSX 2005-12-18 01:33 UTC Initial database population.

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