sentences:  In the Tholen classification, "Christa" is a common C-type asteroid, while in the SMASS classification, it is a Xc-subtype that transitions from the carbonaceous C-type to the X-type asteroids.It has also been characterized as a primitive P-type asteroid by the Wide-field Infrared Survey Explorer (WISE).In April 2005, a first rotational lightcurve of "Christa" was obtained from photometric observations by French amateur astronomers Raymond Poncy and René Roy.