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Latest Details
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| Name |
RT Lac |
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| AAVSO UID |
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| Constellation |
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| J2000.0 |
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| B1950.0 |
21 59 28.63 +43 38 55.5 |
| Proper motion |
| RA: 57.168 +/- 0.080 mas/y | Dec: 21.435 +/- 0.094 mas/y | Source: Gaia DR1 |
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| Galactic coord. |
93.407 -9.027 |
Other names
(Internal only)
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AAVSO 2157+43 |
AN 13.1908 |
ASASSN-V J220130.76+435326.3 |
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BD+43 4112 |
HD 209318 |
HIP 108728 |
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SAO 51563 |
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| Variability type |
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EB/AR/RS |
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| Spectral type |
G9IV+K1IV |
| Mag. range |
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8.84 - 9.89 V |
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| Discoverer |
L. Ceraski (30 May 1908) |
| Epoch |
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| Outburst |
-- |
| Period |
5.0739496 d |
| 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 |
GCVS Team |
Min II 9.62. P var. Min I = 2440382.9005 + 5.0740484d*E + 1.02d*10**(-8)*E**2 (JD2411650 - 42500) [D.S.Hall, J.M.Kreiner, AA 30, 387, 1980.]; since JD2436470 - see Table. There is a square term in the elements given in the Table: -2.7d*10**(-8)*E**2. Shape of the light curve and depths of the Minima vary. According to [J.A.Eaton, D.S.Hall, ApJ 227, 907, 1979.] the period of the distortion wave migration is ~9.5 yr, the period of the wave amplitude variations (0 < A <= 0.17m) is ~30 yr. According to [Z.Tunca, C.Ibanoglu, O.Tuemer, A.Y. Ertan, S.Evren, ApSS 93, N2, 431, 1983.] the migration period is nearly half of the value given in [J.A.Eaton, D.S.Hall, ApJ 227, 907, 1979.]. |
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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 |
Bob Nelson's O-C files, 2016 |
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2 |
Z.Tunca, C.Ibanoglu, O.Tuemer, A.Y. Ertan, S.Evren, ApSS 93, N2, 431, 1983. |
1983Ap&SS..93..431T |
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3 |
F.W.Wright, HA 89, N10, 1937. |
1932AnHar..89..171W |
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4 |
Ceraski, W., 1908, Deux variables nouvelles |
1908AN....178..167C |
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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 = 6.90 | H = 6.29 | K = 6.17 | J - K = 0.74 |
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AllWISE
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W1 = 6.03 | W2 = 5.93 | W3 = 5.94 | W4 = 5.86 | W1 - W2 = 0.10 | W3 - W4 = 0.09 |
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APASS-DR9
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B = 10.20 | g' = 10.11 |
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SDSS-DR12
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u = 14.37 | g = 9.89 | r = 12.85 | i = 12.16 | z = 8.50 | u - g = 4.48 | r - i = 0.68 |
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Images
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Supporting Documents
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Revision History
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