Bulk density of asteroid 243 Ida from the orbit of its satellite Dactyl

Article Abstract:

Using mathematical and statistical means the bulk density of 243 Ida has been calculated with the help of the orbits of its satellite Dactyl. The density calculated shows that Ida is probably stony with a small amount of NiFe. The orbits of Dactyl have been calculated to be elliptical with their periapse distance approaching Ida as their apoapse distance increases beyond a distance equal to the product of the heliocentric distance of the Dactyl-Ida system and the mass of Ida divided by the Mass of the Sun.

Satellites, Satellites (Astronomical bodies), Orbits (Astrophysics)

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Seismic resurfacing by a single impact on the asteroid 433 Eros

Article Abstract:

A study was conducted on the Asteroid 433 Eros to show that the formation of relatively young crater resulted in the removal of other carters as large as 0.5 km over nearly 40 percent of the asteroid. The results suggested that the interior of Eros is sufficiently cohesive to transmit seismic energy over many kilometers and outer several tens of meters of the asteroids must be composed of relatively noncohesive material.

Craters, Seismic prospecting, Seismic surveying, Impact craters, Eros (Asteroid)

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Differentiation of the asteroid Ceres as revealed by its shape

Article Abstract:

Ceres, known as the largest and the most massive asteroid is presumed to be homogenous, in part due to its low density, low albedo and relatively featureless visible reflectance spectrum. The shape and the smoothness of the Ceres, which is less flattened than expected for a homogenous object with central mass concentration, projects it as different.

Science & research, Research, Discovery and exploration, Outer space, Space exploration, Ceres (Asteroid)

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