Mesidor

Key Facts

• Categorized as a Main-belt Asteroid
• Comparable in size to the San Francisco Bay
• Not a Near Earth Object
• Not a Potentially Hazardous Object
• See orbit simulation

Overview

Mesidor is a mid-sized asteroid orbiting between Mars and Jupiter in the main portion of the asteroid belt. NASA JPL has not classified Mesidor as potentially hazardous because its orbit does not bring it close to Earth.

Mesidor orbits the sun every 1,700 days (4.65 years), coming as close as 2.68 AU and reaching as far as 2.90 AU from the sun. Based on its brightness and the way it reflects light, Mesidor is probably between 3.703 to 8.280 kilometers in diameter, making it larger than 99% of asteroids, very roughly comparable in size to the San Francisco Bay.

No Close Approaches

Mesidor's orbit is 1.69 AU from Earth's orbit at its closest point. This means that there is an extremely wide berth between this asteroid and Earth at all times.

Orbital simulations conducted by NASA JPL's CNEOS do not show any close approaches to Earth.

Images and Observations

Mesidor's orbit is determined by observations dating back to Jan. 28, 1992. It was last officially observed on July 31, 2022. The IAU Minor Planet Center records 2,256 observations used to determine its orbit.

Accessibility and Exploration

This asteroid is not considered a viable target for human exploration by the NHATS study.

Similar Objects

These objects have orbits that share similar characteristics to the orbit of Mesidor:

• 68 Leto (A861 HB)
• 139 Juewa (A874 TA)
• 183 Istria (A878 CD)

References

• JPL Small Body Database
• Mission Design
• Sky Finder Chart

Orbit Simulation

Sky Map

The position of Mesidor is indicated by a ◯ pink circle. Note that the object may not be in your current field of view. Use the controls below to adjust position, location, and time.

Size Rendering

The above comparison is an artistic rendering that uses available data on the diameter of Mesidor to create an approximate landscape rendering with Mount Everest in the background. This approximation is built for full-resolution desktop browsers. Shape, color, and texture of asteroid are imagined.