Hilda (minor planet designation: 153 Hilda) is a large asteroid in the outer main belt, with a diameter of 170 km. Because it is composed of primitive carbonaceous materials, it has a very dark surface. It was discovered by Johann Palisa on 2 November 1875, from the Austrian Naval Observatory at Pula, now Croatia. The name was chosen by the astronomer Theodor von Oppolzer, who named it after one of his daughters.
|Discovered by||J. Palisa|
|Discovery site||Austrian Naval Obs.|
|Discovery date||2 November 1875|
|Main belt (Hilda)|
|Epoch 31 July 2016 (JD 2457600.5)|
|Uncertainty parameter 0|
|Observation arc||121.05 yr (44215 d)|
|Aphelion||4.5341 AU (678.29 Gm)|
|Perihelion||3.4225 AU (512.00 Gm)|
|3.9783 AU (595.15 Gm)|
|7.94 yr (2898.3 d)|
|0° 7m 27.156s / day|
|Jupiter MOID||0.569657 AU (85.2195 Gm)|
Equatorial escape velocity
|~ 6 m/s|
|5.9587 h (0.24828 d)|
Orbit and familyEdit
Hilda gives its name to an asteroid group called the Hilda group (or Hildas for short). It is not a true asteroid family, since the members are not physically related, but rather share similar orbital elements. The Hildas are locked in a 2:3 orbital resonance with Jupiter; since Jupiter takes 11.9 years to orbit the Sun while Hilda takes 7.9 years, Jupiter orbits the Sun twice for every 3 orbits that Hilda completes. There are over 1,100 other objects known to be in a 2:3 resonance with Jupiter.
- Based on orbital data from the year 2000. Hilda seldom approaches the Lagrangians exactly.
- "JPL Small-Body Database Browser: 153 Hilda". 12 February 1998. Retrieved 12 May 2016.
- "Hilda". Dictionary.com Unabridged. Random House.
- Bhattacharya & Lichtman (2016) Solar Planetary Systems, p. 6
- Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names. Springer Science & Business Media. p. 29. ISBN 978-3-540-00238-3.
- Brož, M.; Vokrouhlický, D. (2008). "Asteroid families in the first-order resonances with Jupiter". Monthly Notices of the Royal Astronomical Society. 390 (2): 715–732. arXiv:1104.4004. Bibcode:2008MNRAS.390..715B. doi:10.1111/j.1365-2966.2008.13764.x.
- The triangle formed by the Hilda asteroids EasySky
- 153 Hilda at AstDyS-2, Asteroids—Dynamic Site
- 153 Hilda at the JPL Small-Body Database