Variable Star RTLac


RT Lac = AN 1908.0013 = BD +43 4112 = HD 209318 = SAO 051563 

GCVS result

ID: 450012
Variable star: RT Lac
RA 2000: 220130.7
DE 2000: +435326
RA 1950:
DE 1950:
Type of variability: EB/AR/RS
Max (mag): 8.84
Min (mag): 9.89
Photometric system: V
Epoch (JD): 44873.3648
Period (d): 5.0739496
Year of outburst for N, SN:
M-m (or D):
Spectrum: G9IV+K1IV
Study reference: 09292
Chart or phot. ref.: 00010
Cases of non-existence:

GCVS NOTE result

Min II 9.62. P var. Min I = 2440382.9005 + 5.0740484d*E + "1.02d*10**(-8)*E**2 (JD2411650 - 42500) [08592] 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 [09293] 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 [09292] the migration period is nearly half of the value given in [09293].

GCVS NOTES fulltext search:  

NSV: Suspected Variable NSV  not found.

BRKA result

Variable star: RT Lac
Brightness type: 09
Points: 9
RA 2000: 220130.4
DE 2000: +435324
Max (mag): 8.84
Min (mag): 9.89
Sec (mag): 9.62
Photometric system: V
Epoch (JD): 51545.484
Period (d): 5.0737875
D (hour): B
d (hour): -
Astrophysical note:
Reference: SAC 71
Finding chart: K

MEKA: Variable star RT Lac not found.

Please put the variable's designation into field in common style - for example: ZUMa, zuma, V477Cyg, v1182Cyg, NSV 255, nsv2544. Designation of bright variable stars like Beta Persei type in short style (three letters) - bet Per. The complete cross-identification among more then 30 catalogues will be done after submitting.
Spaces and cases are ingnored..

Search for variable star:
Search in: All catalogues / databases
 Search for data on the NET
 Open European Journal on Variable stars

 GCVS (2011)  43.675 records
 NSV (1997) 14.811 records
 BRKA (2001)  1.432 records
 MEKA (2001)  147 records
 CzeV, SvkV and RafV catalogues (new variables)
 BCVS (1994)  529.953 records
 Show DSS plate 15'x 15' (use coords: )
(Selected catalogue has to be checked above.)