# 243 Ida

> main-belt asteroid

**Wikidata**: [Q149012](https://www.wikidata.org/wiki/Q149012)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/243_Ida)  
**Source**: https://4ort.xyz/entity/243-ida

## Summary

243 Ida is an asteroid[1]. It orbits the Sun within the main asteroid belt between Mars and Jupiter. The object was discovered on September 29, 1884, by Austrian astronomer Johann Palisa at the Vienna Observatory[1].243 Ida measures approximately 53.6 kilometers in length and has an irregular, elongated shape[1]. It is classified as an S-type asteroid, indicating a stony composition[1]. The asteroid has a rotation period of about 4.63 hours[1].In 1993, 243 Ida became the first asteroid confirmed to have a natural satellite when the Galileo spacecraft photographed its moon, Dactyl[1]. Dactyl orbits Ida at a distance of roughly 90 kilometers[1].


## References

1. [JPL Small-Body Database](https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=20000243)
2. Minor Planet Center database
3. [Source](https://github.com/JohnMarkOckerbloom/ftl/blob/master/data/wikimap)
4. Library of Congress
5. Freebase Data Dumps. 2013
6. JPL Small-Body Database
7. [Source](https://nineplanets.org/243-ida-and-dactyl/)
8. [Source](https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/req/naif_ids.html)
9. The Shape of Ida
10. [Source](https://encyklopedia.pwn.pl/haslo/Ida;3913820.html)
11. National Library of Israel