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Astroid The hypocycloid construction of the astroid. Astroid x 2 ⁄ 3 + y 2 ⁄ 3 = r 2 ⁄ 3 as the common envelope of a family of ellipses of equation (x ⁄ a) 2 + (y ⁄ b) 2 = r 2, where a + b = 1.
In the main asteroid belt, there appear to be two primary populations of asteroid: a dark, volatile-rich population, consisting of the C-type and P-type asteroids, with albedos less than 0.10 and densities under 2.2 g/cm 3, and a dense, volatile-poor population, consisting of the S-type and M-type asteroids, with albedos over 0.15 and densities ...
This tumbling asteroid has an unusually slow rate of rotation, requiring 17.4 days to complete a 360° revolution about its axis. It is a primitive C-type asteroid , which means the surface has a high proportion of carbon ; giving it a dark surface that reflects only 4% of the light that falls on it.
where is the asteroid albedo (precisely, the Bond albedo), its semi-major axis, is the solar luminosity, and the asteroid's radius. It has been assumed that: the absorptivity is 1 − A {\displaystyle 1-A} , the asteroid is spherical, it is on a circular orbit, and that the Sun's energy output is isotropic .
15 Eunomia is a very large asteroid in the middle asteroid belt. It is the largest of the stony asteroids, with 3 Juno as a close second. It is quite a massive asteroid, in 6th to 8th place (to within measurement uncertainties). It is the largest Eunomian asteroid, and is estimated to contain 1% of the mass of the asteroid belt. [7] [8]
2024 RW 1, previously known under its provisional designation CAQTDL2, [5] was a 1-meter-sized asteroid or meteoroid that struck the Earth's atmosphere and burned up harmlessly on September 5, 2024, at around 12:40 a.m. PHT (September 4, 16:40 UTC) above the western Pacific Ocean near Cagayan, Philippines.
An asteroid streaked past northern Siberia in the middle of the night Tuesday before burning up in Earth's atmosphere, lighting up the skies with a blinding flash, dramatic video shows.
44 Nysa is a large and very bright main-belt asteroid, and the brightest member of the Nysian asteroid family. It is classified as a rare class E asteroid and is probably the largest of this type (though 55 Pandora is only slightly smaller).