kids encyclopedia robot

16 Psyche facts for kids

Kids Encyclopedia Facts
Quick facts for kids
16 Psyche
Discovered by Annibale de Gasparis
Discovery date March 17, 1852
Main belt
Orbital characteristics
Epoch October 22, 2004 (JD 2453300.5)
Aphelion 497.884 Gm (3.328 AU)
Perihelion 375.958 Gm (2.513 AU)
436.921 Gm (2.921 AU)
Eccentricity 0.140
1823.115 d (4.99 a)
17.34 km/s
Inclination 3.095°
Physical characteristics
Dimensions ~280×230×190 km
Mass ~1.7×1019 kg
Mean density
3.3 ± 0.7 g/cm³
~0.06 m/s²
~0.13 km/s
0.1748 d (4.196 h)
Albedo 0.120 (geometric)
Temperature ~160 K
max: ~280 K (+7 °C)
Spectral type
9.27 (brightest?)

16 Psyche is a very big Main belt asteroid, well over 200 kilometers in diameter, and likely the biggest of the metallic M-type asteroids. It is estimated to have 0.6 percent of the mass of the entire asteroid belt.

This asteroid was found by Annibale de Gasparis on March 17, 1852 from Naples and named after the Greek nymph Psyche. The first fifteen asteroids to be found were given symbols by astronomers as a type of short-hand notation. In 1851, however, J. F. Encke suggested using a circled number. 16 Psyche was the first new asteroid to be found that was designated with this scheme (in 1852 by J. Ferguson).


Radar observations indicate that it is made of iron-nickel. Psyche appears to be a case of an exposed metallic core from a bigger differentiated parent body. Unlike some other M-type asteroids, Psyche shows no sign of the presence of water or water-bearing minerals on its surface, consistent with its interpretation as a metallic body. Small amounts of pyroxene appear to be present.

If Psyche is the core remnant of a bigger parent body, we might expect other asteroids on similar orbits. Psyche does not belong to any asteroid family. One theory is that the collision occurred very early in the solar system's history, and all the other remnants have since been ground into fragments by subsequent collisions or had their orbits perturbed beyond recognition.

Psyche is massive enough that its perturbations on other asteroids can be measured, which enables a mass measurement. Its density is fairly low for metal (although fairly common for asteroids as such), indicating a fairly high porosity of 30–40%.

Psyche appears to have a fairly round surface and is approximately ellipsoidal in shape. Recent lightcurve analysis indicates that its pole points towards either ecliptic coordinates (β, λ) = (-9°, 35°) or (β, λ) = (-2°, 215°) with a 10° uncertainty. This gives an axial tilt of 95°.

Two stellar occultations by Psyche have been seen (from Mexico on March 22, 2002, and another on May 16, 2002). Lightcurve changes indicate a non-spherical body, consistent with the lightcurve and radar results.

Images for kids

See also

Kids robot.svg In Spanish: (16) Psyche para niños

National Hispanic Heritage Month on Kiddle
Famous Hispanic actresses
Eden Espinosa
Cameron Diaz
Eva Longoria
Rita Moreno
kids search engine
16 Psyche Facts for Kids. Kiddle Encyclopedia.