| Discovery | |
|---|---|
| Discovered by | Franz Kaiser |
| Discovery site | Heidelberg |
| Discovery date | 25 January 1914 |
| Designations | |
| (778) Theobalda | |
| Pronunciation | /θiːoʊˈbɔːldə/ |
| 1914 UA | |
| main belt,Theobalda family | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 92.58 yr (33816 d) |
| Aphelion | 3.9839 AU (595.98 Gm) |
| Perihelion | 2.3909 AU (357.67 Gm) |
| 3.1874 AU (476.83 Gm) | |
| Eccentricity | 0.24990 |
| 5.69 yr (2078.5 d) | |
| 24.214° | |
| 0° 10m 23.52s / day | |
| Inclination | 13.687° |
| 321.708° | |
| 134.392° | |
| Earth MOID | 1.42779 AU (213.594 Gm) |
| Jupiter MOID | 1.30066 AU (194.576 Gm) |
| TJupiter | 3.105 |
| Physical characteristics | |
| 32.03±0.95 km | |
| 11.659 h (0.4858 d) | |
| 0.0589±0.004 | |
| 9.66 | |
778 Theobalda is a minor planet orbiting the Sun, in the main asteroid belt. It was discovered by Franz Kaiser on 25 January 1914 and was named after his father, Theobald Kaiser.[2] This is an F-type asteroid[3] that spans ~64 km in girth. It rotates on its axis once every 11.7 hours. 778 Theobalda is orbiting 3.19 AU from the Sun with an eccentricity (ovalness) of 0.25 and a period of 5.69 yr. The orbital plane is inclined at an angle of 13.7° to the plane of the ecliptic.[1]
778 Theobalda is the namesake and largest member of a family of 128 minor planets in the outer belt. The Theobalda asteroid family was likely formed 6.9±2.3 million years ago from a collision-shattered parent body that had a diameter of around 78±9 km.[4]
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