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If in a circular orbit at the distance at which it was seen, Dactyl's orbital period would be about 20 hours. Its orbital speed is roughly 10 m/s (33 ft/s), "about the speed of a fast run or a slowly thrown baseball".
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must be more than about 65 km (40 mi) from Ida for it to remain in a stable orbit. The range of orbits generated by the simulations was narrowed down by the necessity of having the orbits pass through points at which
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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.
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observed Ida for eight hours and was unable to spot Dactyl. It would have been able to observe it if it were more than about 700 km (430 mi) from Ida.
674:
570:
Petit, Jean-Marc; Durda, Daniel D.; Greenberg, Richard; Hurford, Terry A.; Geissler, Paul E. (November 1997). "The Long-Term
Dynamics of Dactyl's Orbit".
259:
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observed Dactyl to be at 16:52:05 UT on 28 August 1993, about 90 km (56 mi) from Ida at longitude 85°. On 26 April 1994, the
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of Dactyl's orbit when most of the images were taken, which made determining its exact orbit difficult. Dactyl orbits in the
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Chapman, Clark R.; Klaasen, K.; Belton, Michael J. S.; Veverka, Joseph (July 1994). "Asteroid 243 IDA and its satellite".
322:
122:
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483:"The Formation and Collisional/Dynamical Evolution of the Ida/Dactyl System as Part of the Koronis Family"
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762:
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Davis, Donald R.; Chapman, Clark R.; Durda, Daniel D.; Farinella, Paolo; Marzari, Francesco (1996).
305:"NASA Galileo Spacecraft Continues to Fulfill Many Tasks After Passing by Asteroid Ida 28 Years Ago"
1157:
747:
482:
587:
228:
436:"A compositional study of asteroid 243 Ida and Dactyl from Galileo NIMS and SSI observations"
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direction and is inclined about 8° to Ida's equator. Based on computer simulations, Dactyl's
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discovered. Its discovery settled the long debate over the existence of asteroid moons.
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162:; Dactyl was discovered while examining the delayed image downloads from Galileo on
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Byrnes, Dennis V.; D'Amario, Louis A.; Galileo
Navigation Team (December 1994).
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280:"Asteroid 243 Ida and its newly discovered moon, Dactyl"
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206:Dactyl's orbit around Ida is not precisely known.
260:List of geological features on 243 Ida and Dactyl
1402:
649:in false coloring, to reveal surface differences
202:Diagram of potential orbits of Dactyl around Ida
527:"Solving for Dactyl's Orbit and Ida's Density"
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138:(1 mile, or 1.6 km, in diameter) that
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174:. The satellite was named after the
1416:Minor planets visited by spacecraft
13:
303:Clarke, Aubrey (August 28, 2021).
170:. It was provisionally designated
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752:
746:
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92:
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440:Journal of Geophysical Research
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1:
637:announcing Dactyl's discovery
327:NASA Solar System Exploration
265:
7:
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10:
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643:announcing Dactyl's naming
351:Byrnes & D'Amario 1994
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630:Views of the Solar System
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69:
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1197:: 5268 km / 0.413 Earths
434:Granahan, James (2002).
193:
172:S/1993 (243) 1
16:Moon of asteroid 243 Ida
626:Asteroid Ida and Dactyl
148:. It was imaged by the
602:10.1006/icar.1997.5788
507:10.1006/icar.1996.0047
229:Hubble Space Telescope
203:
531:The Galileo Messenger
246:Dactyl was the first
201:
1370:Planetary-mass moons
533:(35). Archived from
460:10.1029/2001JE001759
323:"In Depth | 243 Ida"
182:, who, according to
1411:Asteroid satellites
584:1997Icar..130..177P
563:1994Metic..29..455C
499:1996Icar..120..220D
452:2002JGRE..107.5090G
422:Chapman et al. 1994
47:Discovery date
21:
1350:Discovery timeline
684:Natural satellites
617:243 Ida and Dactyl
204:
132:(243) Ida I Dactyl
19:
1398:
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1198:
410:Petit et al. 1997
398:Petit et al. 1997
386:Petit et al. 1997
374:Petit et al. 1997
362:Petit et al. 1997
178:creatures called
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50:February 17, 1994
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621:The Nine Planets
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1152:Gǃkúnǁʼhòmdímà
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647:Ida and Dactyl
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611:External links
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578:(1): 177–197.
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65:Dactyl (Ida I)
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1385:Regular moons
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537:on 1997-01-05
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446:(E10): 5090.
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248:asteroid moon
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136:asteroid moon
133:
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89:
80:
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68:
64:
58:
53:
49:
45:
40:
35:
34:
28:
23:
1390:Trojan moons
1380:Subsatellite
1194:
997:
919:Petit-Prince
814:Minor-planet
763:Dwarf planet
688:Solar System
629:
620:
575:
571:
554:
550:
539:. Retrieved
535:the original
530:
490:
486:
476:
443:
439:
429:
417:
405:
393:
381:
369:
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330:. Retrieved
326:
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287:. Retrieved
283:
274:
245:
242:
233:
224:
207:
205:
171:
149:
134:) is a tiny
131:
87:
86:
55:Designations
31:
1355:Inner moons
1061:Skamandrios
551:Meteoritics
518:Works cited
284:www.esa.int
210:was in the
186:, lived on
164:February 17
130:; formally
71:Named after
61:Designation
1405:Categories
1119:Sila–Nunam
985:Cleoselene
980:Alexhelios
958:Gorgoneion
896:Euphrosyne
823:Near-Earth
765:satellites
698:satellites
541:2008-10-23
332:2022-08-11
289:2022-08-11
266:References
220:pericenter
1284:Enceladus
1158:Gǃòʼé ǃHú
1069:Eurybates
1047:Menoetius
1041:Patroclus
1030:Dinkinesh
975:Kleopatra
878:Main belt
838:Dimorphos
696:Planetary
641:IAUC 6082
635:IAUC 5948
588:CiteSeerX
468:0148-0227
188:Mount Ida
156:August 28
42:Discovery
1329:Hyperion
1279:Dysnomia
1209:Callisto
1189:Ganymede
1012:Olympias
882:Kalliope
852:Squannit
827:Florence
799:Gonggong
794:Makemake
254:See also
216:prograde
176:mythical
143:asteroid
1319:Hiʻiaka
1299:Proteus
1289:Miranda
1259:Umbriel
1249:Iapetus
1234:Titania
1195:largest
1182:by size
1167:2013 FY
1124:Salacia
1110:2002 UX
1032:(Selam)
1020:Pulcova
970:Elektra
965:Camilla
948:Minerva
933:Romulus
913:Eugenia
906:Peneius
868:2001 SN
861:1994 CC
832:Didymos
732:Neptune
717:Jupiter
686:of the
580:Bibcode
559:Bibcode
557:: 455.
495:Bibcode
448:Bibcode
225:Galileo
208:Galileo
180:dactyls
151:Galileo
146:243 Ida
76:dactyls
33:Galileo
1375:Naming
1334:Phoebe
1324:Actaea
1314:Nereid
1309:Ilmarë
1274:Tethys
1254:Charon
1244:Oberon
1229:Triton
1224:Europa
1180:Ranked
1144:Ilmarë
1130:Actaea
1055:Hektor
1006:Roxane
998:Dactyl
927:Sylvia
901:Daphne
846:Moshup
789:Quaoar
784:Haumea
727:Uranus
722:Saturn
590:
572:Icarus
487:Icarus
466:
239:Origin
140:orbits
88:Dactyl
20:Dactyl
1304:Mimas
1294:Vanth
1269:Dione
1264:Ariel
1204:Titan
1138:Varda
1094:Hiisi
1088:Lempo
1075:Queta
1025:Balam
953:Aegis
940:Remus
888:Linus
816:moons
779:Pluto
774:Orcus
707:Earth
628:from
619:from
212:plane
194:Orbit
1365:List
1239:Rhea
1219:Moon
1101:Paha
1084:TNOs
804:Eris
712:Mars
464:ISSN
168:1994
160:1993
127:-til
1338:...
992:Ida
870:263
598:doi
576:130
503:doi
491:120
456:doi
444:107
125:DAK
1407::
1214:Io
1169:27
1112:25
767:of
700:of
596:.
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555:29
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341:^
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166:,
158:,
676:e
669:t
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600::
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561::
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509:.
505::
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458::
450::
335:.
311:.
292:.
118:/
115:l
112:ɪ
109:t
106:k
103:æ
100:d
97:ˈ
94:/
90:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
