VSX : Detail for IV Cyg

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Details for Revision 1

Name

IV Cyg

AAVSO UID

Constellation

Cygnus

Sequence

J2000.0

19 50 12.30 +34 19 27.0 (297.55125 +34.32417)

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B1950.0

19 48 19.01 +34 11 47.1

Galactic coord.

69.719 +4.055

Other names

(Internal only)

AN 321.1929

UCAC2 43841979

USNO-B1.0 1243-0369279

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Variability type

RRAB

Spectral type

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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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.	--