The Martian expedition to Pluto first spotted it-the two planets happened to be nearly in conjunction then, and they have a good orbit calculation.

In addition, he worked on such space technology problems as orbit calculations, reentry paths, and space rendezvous techniques.

As a high school student in 1977, Dr. Butler learned techniques of orbit calculation when he attended the Summer Science Program.

He was also an early authority on electronic digital computers and assisted in their construction and use in orbit calculations.

Commonly used in planetary orbit calculation.

It was named after German amateur astronomer Otto Kippes, acknowledged for his work in asteroid orbit calculations.

It is commonly used in planetary orbit calculation.

In 2005, Steele attended the Summer Science Program, which teaches astronomy with a curriculum based on observations and orbit calculations of an asteroid.

And mess up all my orbit calculations?

The exceptionally long observation period allowed an unusually precise orbit calculation, and the asteroid was determined to have a small chance of colliding with the Earth.