4769 Castalia
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4769 Castalia (Template:IPAc-en; prov. designation: Template:Mp) is a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately Template:Convert in diameter and was the first asteroid to be modeled by radar imaging. It was discovered on 9 August 1989, by American astronomer Eleanor Helin (Caltech) on photographic plates taken at Palomar Observatory in California. It is named after Castalia, a nymph in Greek mythology. It is also a Mars- and Venus-crosser asteroid.<ref name=jpldata />
General information
[edit]On 25 August 1989 Castalia passed Template:Convert<ref name=jpl-close/> (within eleven lunar distances) of Earth, allowing it to be observed with radar from the Arecibo Observatory by Scott Hudson (Washington State University) and Steven J. Ostro (JPL). The data allowed Hudson et al. to produce a three-dimensional model of the object. During the 1989 passage Castalia peaked at an apparent magnitude of 12.<ref name="NEODyS1989"/>
Castalia has a peanut shape, suggesting two approximately 800-meter-diameter pieces held together by their weak mutual gravity. Since then radar observations of other asteroids have found other contact binaries.<ref name="Binary"/>
Castalia is a potentially hazardous asteroid (PHA) because its minimum orbit intersection distance (MOID) is less than 0.05 AU and its diameter is greater than 150 meters. The Earth-MOID is Template:Convert.<ref name=jpldata/> Its orbit is well-determined for the next several hundred years.
| Date | JPL Horizons nominal geocentric distance (AU) |
uncertainty region (3-sigma) |
|---|---|---|
| 2023-Aug-22 09:21 | Template:Convert<ref name="jpldata"/> | ±Template:Val<ref name="CA2023"/> |