Ida was the first asteroid shown to have a tiny moon, Dactyl. Ida. 433 Eros - Near-Earth asteroid being studied from orbit by the NEAR mission, which flew by Eros in February 1999 and went into orbit … 1758. 240 bc. When can Halley's Comet be traced back to? How long does it take … In 1993, the Galileo spacecraft, heading toward Jupiter, took this picture 2,000 miles from asteroid Ida. The tiny dot to the right is its moon, Dactyl. IP Am Asteroid with Its Own Moon The asteroid 243 Ida has its own small moon, Dactyl. While little ejecta from Ida is captured by Dactyl, about half of the mass ejected from Dactyl at speeds of up to 20 m/sec eventually falls on Ida. Dactyl. 253 Mathilde - Target of NEAR mission flyby on 27 June 1997 en route to 433 Eros. A comet's mass _____ with time. In 1993, the first asteroid moon was confirmed when the Galileo probe discovered the small Dactyl orbiting 243 Ida in the asteroid belt. Both Ida and Dactyl are composed of earthlike rock. 243 Ida is a 56 km long asteroid orbiting in the main asteroid belt with a number of notable features. Ida (to the left) has a 56 kilometer dimension and Dactyl (the point to the right) is 1.5 kilometers. Galileo image of 243 Ida. Ida is an S-type asteroid, or stony asteroid, and is mostly composed of rock and iron from accretion during early solar system formation. Credit: NASA : Mathilde (253) Mathilde is the asteroid N ° 253. What is the name of the moon orbiting Ida? (See the photo on p. 390) (a) Outline a strategy to find the mass of 243 Ida, given that the orbital radius of Dactyl is 89 km arid its period is 19 hr. Galileo was imaging the asteroid through different-color filters, mapping its color as it rotated. 18) Asteroid Ida was photographed by the Galileo spacecraft in 1993, and the photograph revealed that the asteroid has a small moon, which has been named Dactyl. Ida is about 58 by 23 by 21 kilometres, which is much larger than Gaspra, while Dactyl is a mere 1.5 kilometres across. Solution: Chapter 12 Gravity Q.34P (b) Use your strategy to calculate the mass of 243 Ida. Particles launched at speeds just barely exceeding Dactyl's escape velocity can enter relatively long-term orbit around Ida, but few are ultimately reaccreted by the satellite. ... How long does it take for Halley's Comet to orbit? Assuming a circular orbit what would be the orbital speed of Dactyl? From the dimensions of Ida and its general features, one can estimate the mass of Ida to be 4.5 × 10 16 kg, and the distance between Dactyl and Ida is approximately 90 km. What are binary asteroids? When is Halley's Comet expected to come into view? The asteroid Ida and its satellite Dactyl, photographed in 1994 by the probe Galileo at a distance of 10870 kilometers. Figure 156: Asteroid Ida and Its Moon, Dactyl. 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