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
Discovery
Discovered byFranz Kaiser
Discovery siteHeidelberg
Discovery date25 January 1914
Designations
(778) Theobalda
Pronunciation/θˈbɔːldə/
1914 UA
main belt,Theobalda family
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc92.58 yr (33816 d)
Aphelion3.9839 AU (595.98 Gm)
Perihelion2.3909 AU (357.67 Gm)
3.1874 AU (476.83 Gm)
Eccentricity0.24990
5.69 yr (2078.5 d)
24.214°
0° 10m 23.52s / day
Inclination13.687°
321.708°
134.392°
Earth MOID1.42779 AU (213.594 Gm)
Jupiter MOID1.30066 AU (194.576 Gm)
TJupiter3.105
Physical characteristics
32.03±0.95 km
11.659 h (0.4858 d)
0.0589±0.004
9.66

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]

References

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  1. ^ a b "778 Theobalda (1914 UA)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
  2. ^ Schmadel, Lutz D. (2013), Dictionary of Minor Planet Names, Springer Berlin Heidelberg, p. 118, ISBN 9783662028049.
  3. ^ Gladman, B. J.; et al. (May 2010), "Sub-Kilometer Asteroid Diameter Survey (SKADS) V1.0", NASA Planetary Data System, Bibcode:2010PDSS..118.....G, EAR-A-I0655-5-SKADS-V1.0.
  4. ^ Novaković, Bojan (September 2010), "Portrait of Theobalda as a young asteroid family", Monthly Notices of the Royal Astronomical Society, 407 (3): 1477–1486, arXiv:1005.3574, Bibcode:2010MNRAS.407.1477N, doi:10.1111/j.1365-2966.2010.17051.x.
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