Using the photographic imagery of the SO galaxy NGC 5102, the equivalent luminosity profile and the fractional integrated luminosity curve have been derived. Several photometric parameters of the galaxy, such as a total magnitude ( B T ), equivalent radius ( r ∗ e ), effective surface brightness ( μ ∗ e ), and concentration indices ( C 21 , C 32 ) were derived from the luminosity profiles. According to the decomposition method from the nonlinear least squares fitting, photometric parameters of the bulge ( μ e , r e ) and the exponential disk ( μ ( 0 ) , α − 1 ), and the bulge to total luminosity ratio (B/T) were obtained. The derived central disk surface brightness ( μ ( 0 ) = 22.06 ± 0.18 m a g / □ " ) and the evaluated B/T ratio (= 0.52) of the NGC 5102 are close to the mean values ( μ ( 0 ) = 21.65 ± 0.3 m a g / □ " , B/T=0.63) of the SO galaxies. Analysis showed that a lens-like hump is embedded in the equivalent luminosity profile of the NGC 5102.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. OBSERVATION AND DATA REDUCTION
Ⅲ. LUMINOSITY PROFILE AND PHOTOMETRIC PARAMETERS
Ⅳ. CONCLUSION
REFERENCES

• SOHN YOUNG-JONG(Department of Astronomy and Atmospheric Science, Yonsei University)
• CHUN MUN-SUK(Department of Astronomy and Atmospheric Science, Yonsei University)
• BYUN YONG-IK(Mt. Stromlo and Siding Spring Observatory, Institute of Advanced Studies, Australian National University)