300 Geraldina is a large Main belt asteroid. It was discovered by Auguste Charlois on October 3, 1890, in Nice. The origin of the name is unknown. It is orbiting the Sun at a distance of with a period of and an eccentricity (ovalness) of 0.057. The orbital plane is tilted at an angle of 0.73ð to the plane of the ecliptic.
Light curve analysis based on photometric observations of this asteroid made during 2005 show a rotation period of with a brightness variation of 0.18 in magnitude.