1 Introduction

2 Data and Methodology  
2.1 The Optical Spectroscopic Observations  
2.2 Optical-to-infrared light curves  
2.3 X-ray and UV observations  
2.4 The UV-to-infrared spectral energy distribution  

3 Result  
3.1 The Orbital Parameters and Ephemeris  
3.2 The Mass Function of the Compact Object  
3.3 The Mass of the Compact Object  

4 Discussion  
4.1 The Origin of the UV Emission  
4.2 Possible Origin of the Orbital Modulation  
4.3 Searching for Radio and Gamma-ray Counterparts  
4.4 The Trajectory of J2354  
4.5 Alternative Scenario  

5 Summary