Astronomical specifications:
| Discovery | |
| Orbital characteristics: | |
| Distance from Sun | km |
| Perihelion | (106 km) |
| Aphelion | (106 km) |
| Inclination | deg |
| Eccentricity | |
| Orbital periode rond Sun | days |
| Main orbital speed | km/s |
| Inclination to Sun equator | deg |
| Number of moons | |
| Rings | |
| Physical characteristics: | |
| Dimensions | km |
| Radius | km |
| Surface area | km² |
| Volume | 106 km³ |
| Mass | 1024 kg |
| Density | g/cm³ |
| Equatorial surface gravity | m/s² |
| Escape velocity | km/s |
| Rotation period | days |
| Surface temperature | K |
| Axial tilt | deg |
| Atmospheric composition | |
Mathilde, Gaspra, and Ida (left to right, all at the same scale). The image of Mathilde was taken by the Near Earth Asteroid Rendezvous spacecraft on June 27, 1997. Images of Gaspra and Ida were taken in 1991 and 1993, respectively, by the Galileo spacecraft.