Psyche

16 Psyche is a large asteroid located in the outer part of the main asteroid belt. It is the most massive M-type (metallic) asteroid currently known in the solar system.

Size and Shape

• Dimensions: It is an irregular, potato-shaped object. Its approximate dimensions are 279 km x 232 km x 189 km (173 x 144 x 117 miles).

• Mass: It accounts for approximately 1% of the total mass of the asteroid belt.

• Gravity: Its surface gravity is approximately 0.144 m/s², which is about 1.5% of Earth's gravity.

Metallic Composition

16 Psyche is unique because, unlike most asteroids which are made of rock or ice, it appears to be composed largely of metal.

• Primary Materials: Radar observations and spectral analysis indicate the surface is composed of 30% to 60% metal, primarily iron and nickel.

• Density: It has a high bulk density of approximately 3,400 to 4,100 kg/m³.

• Origin Theory: Scientists hypothesize that 16 Psyche may be the exposed metallic core of a protoplanet. In this model, a series of massive collisions billions of years ago stripped away the rocky outer layers (crust and mantle) of the original planet-sized body, leaving only the frozen metal center.

Surface Features

• Cratered Terrain: Observation data shows two large impact basins in its southern hemisphere.

• Metallic Reflectivity: The asteroid has a high radar albedo, which confirms the presence of metal-rich materials on the surface.

• Silicate Content: There are also patches of silicate rock mixed with the metal, which may be remnants of the asteroid's former mantle or material from later impacts.

Current Scientific Mission

In October 2023, NASA launched the Psyche spacecraft. It is currently traveling toward the asteroid and is scheduled to arrive in August 2029. The mission goals are:

• To determine if 16 Psyche is indeed a planetary core or a different type of unmelted material.

• To map the asteroid’s surface and measure its magnetic field.

• To analyze the chemical composition of the metal and rock on the surface.

Discovery Date

March 17, 1852

Discoverer

Annibale de Gasparis

Orbital Period

5 Earth years

Rotation Period

4.2 hours

Average Temperature

-173°C (-280°F)