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Since the Bosscha Observatory was established in 1923 researches on visualbinary stars played an important role in astronomical studies in Indonesia. Thevisual binary of WDS 17190-3459 = MLO 4AB = HD156384 = HIP84709 was extensivelyobserved at our observatory and other observatories. This system has alreadypassed periastron three times since observed in the end of year 1876. Theobservation data is more than enough to construct an orbit. By usingThiele-Innes method we computed the orbit, and physical parameters aredetermined by using mass-luminosity relation. The result is presented in thetable. Orbital Parameters: e = 0.578, P = 42.3 years, T = 1974.9, i = 132o.7,{\omega} = 247o.5, {\Omega} = 318o.1, a = 1".713, mu = 8 o.51/yearsPhysical Parameters:p = 0".134, Mbol1 = 6.7, Mbol2 = 7.4, M1 = 0.6 Mo, M2 = 0.5Mo, q = 0.863. At time being there are several new methods for determining theorbit; for example the method of Gauss done by S\"oderhjelm (1999) forcalculating the orbit of the same stars WDS 17190-3459. Our results arerelatively same.

Orbital and Physical Parameters of Visual Binary: WDS 17190-3459 ({\alpha} 2000 = 17h 18m 56s and {\delta} 2000 = - 34o 59' 22")