lc.txt: photometric data of asteroid, the following are the detail contain of the lc.txt. The first line gives the total number of light curves, Individual light curves begin with the number of data and the data flag( '0' means relative magnitude, while '1' means absolute magnitude). Then follow block contains the photometric data and related observational information. the 1th and 2th column are the light-time corrected observation time in JD and brightness in intensity (reduced to 1AU distance of asteroid to the Earth and the Sun),3-5 columns present the cartesian coordinates of the Sun and of the observer with AU unit in the asteroid-center ecliptic frame.