Page "Hilda family" Paragraph 7

The typical Hilda object has a retrograde perihelion motion.

On average the velocity of perihelion motion is greater as the orbital eccentricity is lesser, while the nodes move more slowly.

All typical objects in aphelion would seemingly approach closely to Jupiter, which should be destabilising for them.

But the adjustment of orbital elements over time helps to avoid this, and conjunctions with Jupiter occur only near the perihelion of Hilda asteroids.

Moreover the apsidal line oscillates near the line of conjunction with different amplitude and a period of 2. 5 to 3. 0 centuries.