Editing Dactyl (moon) (section)

== Origin ==
The origins of Dactyl are unclear, but two main hypotheses exist. The first is that Dactyl and Ida formed at the same time, and the second is that Dactyl was knocked loose by a later impact.<ref>{{Cite journal |last=Granahan |first=James |date=2002 |title=A compositional study of asteroid 243 Ida and Dactyl from Galileo NIMS and SSI observations |url=http://doi.wiley.com/10.1029/2001JE001759 |journal=Journal of Geophysical Research |language=en |volume=107 |issue=E10 |pages=5090 |doi=10.1029/2001JE001759 |bibcode=2002JGRE..107.5090G |issn=0148-0227}}</ref><ref>{{Cite journal |last1=Davis |first1=Donald R. |last2=Chapman |first2=Clark R. |last3=Durda |first3=Daniel D. |last4=Farinella |first4=Paolo |last5=Marzari |first5=Francesco |date=1996 |title=The Formation and Collisional/Dynamical Evolution of the Ida/Dactyl System as Part of the Koronis Family |url=https://linkinghub.elsevier.com/retrieve/pii/S0019103596900470 |journal=Icarus |language=en |volume=120 |issue=1 |pages=220–230 |doi=10.1006/icar.1996.0047|bibcode=1996Icar..120..220D }}</ref>

Dactyl was the first [[asteroid moon]] discovered. Its discovery settled the long debate over the existence of asteroid moons.