4769 Castalia

General information

On 25 August 1989 Castalia passed 0.0269378 AU (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.

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.

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 0.0204 AU. Its orbit is well-determined for the next several hundred years.

References

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|archive-url=https://web.archive.org/web/20040608071121/http://echo.jpl.nasa.gov/~lance/binary.neas.html |archive-date=2004-06-08 |access-date=2014-03-01}}

|archive-url=https://web.archive.org/web/20221026114836/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27Castalia%27&START_TIME=%272023-08-22%2009:21%27&STOP_TIME=%272023-08-23%27&STEP_SIZE=%271%20day%27&QUANTITIES=%2720,39%27 |archive-date=2022-10-26 |url-status=live

References

1. {{OED. Castalia