Lista planetoid z księżycami
Lista planetoid z księżycami zawiera większość planetoid posiadających naturalne satelity.
Uwaga. W ostatniej kolumnie – Odległość – podano średnią odległość między składnikami układu. Wszystkie długości wyrażono w kilometrach.
| Planetoidy: pasa głównego • bliskie Ziemi • przecinające orbitę Marsa • trojańskie • centaury • transneptunowe |
| Planetoida | Typ | Średnica (lub wymiary) | Księżyc | Średnica księżyca (lub wymiary) | Odległość |
| Planetoidy pasa głównego | |||||
| (22) Kalliope | – | (215×180×150) | Linus | 30-45 | 1065 ± 8 |
| (41) Daphne | – | 174 ± 12 | S/2008 (41) 1 | ? | ? |
| (45) Eugenia | – | 214,6 ± 4,2 | Mały Książę | 12,7 ± 0,8 | 1184 ± 12 |
| S/2004 (45) 1 | ~6? | ~700? | |||
| (65) Cybele | – | 237 | S/1979 (65) 1 | 11? | 917? |
| (87) Sylvia | – | (384×264×232) | Remus | 7 ± 2 | 706 ± 5 |
| Romulus | 18 ± 4 | 1356 ± 5 | |||
| (90) Antiope | – | (93,0×87,0×83,6) | S/2000 (90) 1 | (89,4×82,8×79,6) | 170 ± 1 |
| (93) Minerva | – | 141,6 | S/2009 (93) 1 | 4 | 630 |
| S/2009 (93) 2 | 3 | 380 | |||
| (107) Camilla | – | 222,6 ± 17,1 (325×223×139) | S/2001 (107) 1 | 9 ± 1 | 1235 ± 16 |
| (121) Hermione | – | 209,0 ± 4,7 (265×180×180) | S/2002 (121) 1 | 18 | 794,7 ± 2,1 |
| (130) Elektra | – | 182,3 ± 11,8 | S/2003 (130) 1 | 4 | 1252 ± 30 |
| (216) Kleopatra | – | 217×94×81 | Alexhelios | 8,9 ± 1,6 | 678 ± 13 |
| Cleoselene | 6,9 ± 1,6 | 454 ± 6 | |||
| (243) Ida | – | (59,8×25,4×18,6) | Daktyl | (1,6×1,4×1,2) | 108 |
| (283) Emma | – | 148,1 ± 4,6 | S/2003 (283) 1 | 12 | 596 ± 3 |
| (317) Roxane | – | 18,7 | S/2009 (317) 1 | 5 | 245 |
| (379) Huenna | – | 92,3 ± 1,7 | S/2003 (379) 1 | 7 | 3400 ± 11 |
| (702) Alauda | – | 194 | S/2007 (702) 1 | ? | ? |
| (762) Pulcova | – | 137,1 ± 3,2 | S/2000 (762) 1 | 20 | 810 |
| (809) Lundia | – | ~7-10 | S/2005 (809) 1 | ~7-10 | ~10–20 |
| (854) Frostia | – | 13,7 ± 5,6 | S/2004 (854) 1 | ok. 10 | ~25 |
| (939) Isberga | – | 12 | S/2007 (939) 1 | ? | 35? |
| (1089) Tama | – | 12,9 | S/2003 (1089) 1 | 9 | 20 |
| (1313) Berna | – | 11 | S/2004 (1313) 1 | 11 | 35 |
| (1333) Cevenola | – | 18 | S/2008 (1333) 1 | 6,4 | ? |
| (1338) Duponta | – | 11 | S/2007 (1338) 1 | ? | ? |
| (1453) Fennia | – | 7,2 ± 0,4 | S/2007 (1453) 1 | ? | ? |
| (1509) Esclangona | – | 9? | S/2003 (1509) 1 | 4 | 140 |
| (1717) Arlon | – | 9? | S/2007 (1717) 1 | ? | 22? |
| (1830) Pogson | – | ~10 | S/2007 (1830) 1 | ~3 | 25? |
| (2006) Polonskaya | – | 10 | S/2005 (2006) 1 | 3 | 24 |
| (2121) Sevastopol | – | 10,5 | S/2010 (2121) 1 | 4,3 | ? |
| (2131) Mayall | – | 7,7 | S/2009 (2131) 1 | 2,1 | 20 |
| (2478) Tokai | – | 10? | S/2007 (2478) 1 | ? | ? |
| (2486) Metsähovi | – | 12? | S/2007 (2486) 1 | ? | ? |
| (2691) Sersic | – | 6,5 | ? | ok. 23? | |
| (2754) Efimov | – | 7? | S/2006 (2754) 1 | ? | 12? |
| (2815) Soma | – | 9,5 | 2,5 | ok. 24? | |
| (3073) Kursk | – | 8? | S/2007 (3073) 1 | ? | ? |
| (3169) Ostro | – | 4,4? | S/2005 (3169) 1 | 4,4? | 4,8? |
| (3309) Brorfelde | – | 6? | S/2005 (3309) 1 | 1,5? | 14 |
| (3673) Levy | – | 8 | S/2007 (3673) 1 | ? | ? |
| (3703) Volkonskaya | – | 3 | S/2003 (3703) 1 | 1,2 | 11,5? |
| (3749) Balam | – | 7 | S/2002 (3749) 1 | 1,5 | ok. 400 |
| S/2008 (3749) 1 | ~3 | ~20? | |||
| (3782) Celle | – | 6 | S/2003 (3782) 1 | 2,5 | 30 |
| (3868) Mendoza | – | 8 | S/2009 (3868) 1 | 2 | 20 |
| (3982) Kastel’ | – | 8 | S/2005 (3982) 1 | ? | 12? |
| (4029) Bridges | – | 10? | S/2006 (4029) 1 | ? | ? |
| (4492) Debussy | – | 10 | S/2004 (4492) 1 | 6? | 25 |
| (4607) Seilandfarm | – | 10 | S/2009 (4607) 1 | 3 | ok. 20 |
| (4674) Pauling | – | 8 | S/2004 (4674) 1 | 2,5 | 250 |
| (4786) Tatianina | – | 8? | S/2006 (4786) 1 | ? | ? |
| (4951) Iwamoto | – | ~4 | S/2007 (4951) 1 | ~3,5 | ~30? |
| (5474) Gingasen | – | 10? | ? | ? | |
| (5477) Holmes | – | ~7 | S/2005 (5477) 1 | 2,5? | 15? |
| (5481) Kiuchi | – | ~8-10 | S/2008 (5481) 1 | 3 | ok. 20 |
| (5905) Johnson | – | 5 | S/2005 (5905) 1 | 2 | ~15 |
| (6084) Bascom | – | 9? | S/2006 (6084) 1 | 3,5? | 32? |
| (6244) Okamoto | – | 7? | S/2006 (6244) 1 | 1,7? | 15? |
| (6265) 1985 TW3 | – | ~6 | S/2007 (6265) 1 | 1,4? | 3,5? |
| (6615) Plutarchos | – | 5? | S/2007 (6615) 1 | ? | ? |
| (6708) Bobbievaile | – | 8 | S/2009 (6708) 1 | 4,5 | 20 |
| (7225) Huntress | – | ~6,5 | S/2008 (7225) 1 | 1,4 | ok. 15 |
| (8116) Jeanperrin | – | ~6 | S/2007 (8116) 1 | ? | ? |
| (8373) Stephengould | – | 5,5 | S/2010 (8373) 1 | 1,5 | ok. 16? |
| (9069) Hovland | – | 3 | S/2004 (9069) 1 | 0,9 | 13? |
| (9260) Edwardolson | – | ~4 | S/2005 (9260) 1 | 1? | 10? |
| (9617) Grahamchapman | – | 5? | S/2006 (9617) 1 | 1,4? | 10? |
| (10208) Germanicus | – | 4 | S/2007 (10208) 1 | 2 | 18? |
| (11116) 1996 EK | – | ~5 | S/2009 (11116) 1 | ? | ~20 |
| (11264) Claudiomaccone | – | 4 | S/2003 (11264) 1 | 1,2 | 10? |
| (15268) Wendelinefroger | – | 6? | S/2008 (15268) 1 | 1,5? | ok. 20 |
| (15822) 1994 TV15 | – | 7? | ? | ? | |
| (17246) 2000 GL74 | – | 4,5 | S/2004 (17246) 1 | 2 | ~230 |
| (17260) 2000 JQ58 | – | 6? | S/2006 (17260) 1 | 1,5? | 10? |
| (22899) 1999 TO14 | – | 4,5 | S/2003 (22899) 1 | 1,5 | ~170 |
| (32008) 2000 HM53 | – | 5? | S/2007 (32008) 1 | ? | ? |
| (76818) 2000 RG79 | – | 3,6 | S/2005 (76818) 1 | 1,1 | ? |
| Planetoidy bliskie Ziemi | |||||
| (1862) Apollo | Apollo | 1,7 | S/2005 (1862) 1 | 0,08 | 3 |
| (1866) Sisyphus | Apollo | 8,2 | - | ? | ? |
| (3671) Dionysus | Amor | 1,5 | S/1997 (3671) 1 | ~0,3 | ~3,6 |
| (5381) Sekhmet | Aten | 1 | S/2003 (5381) 1 | 0,3 | 1,54 ± 0,12 |
| (7088) Ishtar | Amor | 1,5 | S/2006 (7088) 1 | 0,6? | ~7? |
| (31345) 1998 PG | Amor | 0,9 | S/2001 (31345) 1 | 0,3 | 1,5 |
| (35107) 1991 VH | Apollo | 1,2 | S/2008 (35107) 1 | 0,5 | 3,2 |
| (65803) Didymos | Amor | 0,8 | Dimorphos | 0,15 ± 0,05 | 1,1 |
| (66063) 1998 RO1 | Aten | 0,9 | S/2001 (66063) 1 | 0,36 | 0,8 |
| (66391) 1999 KW4 | Aten | 1,2 | S/2001 (66391) 1 | 0,36 | 2,6 |
| (69230) Hermes | Apollo | 0,4 | S/2003 (69230) 1 | 0,4 | 1 |
| (85938) 1999 DJ4 | Apollo | 0,7 | S/2004 (85938) 1 | 0,35 | 1,5 |
| (88710) 2001 SL9 | Apollo | 1 | S/2001 (88710) 1 | 0,31 | 1,8 |
| (136617) 1994 CC | Apollo | 0,65 | S/2009 (136617) 1 | 0,05 | 0,5 |
| S/2009 (136617) 2 | 0,1 | 1,2 | |||
| (137170) 1999 HF1 | Aten | 3,73 +1,0/-0,5 | S/2001 (137170) 1 | 0,8 | 7 |
| (153591) 2001 SN263 | Amor | 2 | S/2008 (153591) 1 | 1 | ? |
| S/2008 (153591) 2 | 0,4 | ? | |||
| (162000) 1990 OS | Apollo | 0,3 | S/2003 (162000) 1 | 0,045 | 0,6 |
| (162483) 2000 PJ5 | Aten | 0,55 | S/2005 (162483) 1 | 0,28 | ~1 |
| (164121) 2003 YT1 | Apollo | ~1,06 | S/2004 (164121) 1 | ~0,19 | ~3,4 |
| (175706) 1996 FG3 | Apollo | 1,4 | S/2001 (175706) 1 | 0,43 | 2,4 |
| (185851) 2000 DP107 | Apollo | 0,80 (± 0,16) | S/2000 (185851) 1 | 0,30 (± 0,15) | 2,622 ± 0,162 |
| (311066) 2004 DC | Apollo | 0,36 | 0,06 | 0,8[1] | |
| (276049) 2002 CE26 | Apollo | 3,45x3,65x3,26 | 0,3 (± 0,1) | 4,7[2] | |
| 1994 AW1 | Amor | 0,9 | S/2001 (1994 AW1) 1 | 0,5 | 2,1 |
| 1994 XD | Apollo | 1? | S/2005 (1994 XD) 1 | ? | ? |
| 1998 ST27 | Aten | 0,8 | S/2002 (1998 ST27) 1 | 0,12 | 4,5 ± 0,5 |
| 2000 CO101 | Apollo | 0,525 | S/2009 (2000 CO101) 1 | 0,045 | 0,56 |
| 2000 UG11 | Apollo | 0,23 ± 0,06 | S/2001 (2000 UG11) 1 | 0,10 | 0,337 ± 0,013 |
| 2002 BM26 | Amor | 0,6 | S/2002 (2002 BM26) 1 | 0,1 | 1,5 |
| 2002 CE26 | Apollo | 3 | S/2004 (2002 CE26) 1 | 0,2 | 5 |
| 2002 KK8 | Amor | 0,5 | S/2003 (2002 KK8) 1 | 0,1 | ? |
| 2003 SS84 | Apollo | 0,12 | S/2004 (2003 SS84) 1 | 0,06 | 0,3? |
| 2004 DC | Apollo | 0,3 | S/2006 (2004 DC) 1 | ? | ? |
| 2005 AB | Amor | 1,2? | S/2005 (2005 AB) 1 | 0,3 | 2,5? |
| 2005 NB7 | Apollo | 0,5 ± 0,1 | S/2008 (2005 NB7) 1 | 0,2 ± 0,1 | >=0,6 |
| 2006 GY2 | Apollo | 0,45 | S/2006 (2006 GY2) 1 | ? | ? |
| 2006 VV2 | Apollo | 1,8 | S/2006 (2006 VV2) 1 | >0,3 | >=1,5 |
| 2007 DT103 | Apollo | ~0,5 | S/2008 (2007 DT103) 1 | ? | ? |
| 2008 BT18 | Apollo | 0,6 | S/2008 (2008 BT18) 1 | >0,2 | 1,5 |
| Planetoidy przecinające orbitę Marsa | |||||
| (1139) Atami | – | 7 | S/2005 (1139) 1 | 7 | >=20? |
| (2044) Wirt | – | 8? | S/2006 (2044) 1 | 2? | >=15? |
| (2577) Litva | – | 7 | S/2009 (2577) 1 | 2,5 | 20 |
| (5407) 1992 AX | – | 4 | S/2001 (5407) 1 | 1,2 | ~10 |
| (16635) 1993 QO | – | 4? | S/2007 (16635) 1 | ? | ? |
| (25471) 2000 AS152 | – | 8? | S/2009 (25471) 1 | 3? | 26? |
| (32039) 2000 JO23 | – | 4? | S/2007 (32039) 1 | ? | ? |
| (34706) 2001 OP83 | – | 4? | S/2005 (34706) 1 | 1? | 8? |
| (114319) 2002 XD58 | – | ~3 | S/2005 (114319) 1 | ? | ? |
| Trojańczycy (Jowisza) | |||||
| (617) Patroclus | – | 121,8 ± 3,2 | Menoetius | 112,6 ± 3,2 | 685 ± 40 |
| (624) Hektor | – | 363 x 207 ± 42 | S/2006 (624) 1 | 15 | 1000 |
| (17365) 1978 VF11 | - | 98 | S/2006 (17365) 1 | 77 | 120? |
| (29314) Eurydamas | - | 32 | S/2006 (29314) 1 | 24 | 42? |
| Centaury | |||||
| (42355) Typhon | Centaur | 134 ± 13 | Echidna | 78 ± 8 | ok. 1300 |
| (60558) Echeclus | Centaur, kometa | 84 | księżyc 60558 Echeclusa | ok. 8 | ? |
| (65489) Ceto | Centaur | 172 ± 18 | Phorcys | 134 ± 14 | 1841 ± 48 |
| Obiekty transneptunowe | |||||
| (26308) 1998 SM165 | Plutonek | 221? | S/2001 (26308) 1 | 88 | 11 310 ± 110 |
| (47171) 1999 TC36 | Plutonek | 375 ± 50 | S/2001 (47171) 1 | 140 | 7640 ± 460 |
| (48639) 1995 TL8 | SDO | 352 | S/2005 (48639) 1 | 161 | 420 |
| (50000) Quaoar | Cubewano | 1260 ± 190 | Weywot | ~96 | ~11000 |
| (55637) 2002 UX25 | Cubewano | 838? | S/2007 (55637) 1 | 205 ± 55 | ~5000 |
| (58534) Logos | Cubewano | 80 | Zoe | 66 | 8010 ± 80 |
| (60458) 2000 CM114 | – | 150? | S/2006 (60458) 1 | 119? | 2200? |
| (60621) 2000 FE8 | rezonans 5:2 | 151? | S/2007 (60621) 1 | 115? | 1200? |
| (66652) Borasisi | Cubewano | 166 | Pabu | 137 | 4660 ± 170 |
| (79360) 1997 CS29 | Cubewano | 305 | S/2005 (79360) 1 | 292 | 2300 |
| (80806) 2000 CM105 | Cubewano | 224 | S/2005 (80806) 1 | 129 | 2700 |
| (82075) 2000 YW134 | SDO | 431 | S/2005 (82075) 1 | 237 | 1900 |
| (88611) Teharonhiawako | Cubewano | 176 ± 20 | Sawiskera | 122 ± 14 | 27 300 ± 343 |
| (90482) Orkus | Plutonek | ~1000 | Vanth | 262 ± 170 | ~8700 |
| (119067) 2001 KP76 | rezonans 4:7 | 210? | S/2008 (119067) 1 | ? | ? |
| (119979) 2002 WC19 | Twotino | 400? | S/2007 (119979) 1 | 127? | ~2700 |
| (120347) Salacia | Cubewano | 580 | Actaea | 190? | ok. 3500 |
| (123509) 2000 WK183 | Cubewano | 170? | S/2007 (123509) 1 | 141? | ~2400 |
| (134340) Pluton (planeta karłowata) | Plutonek | 2306 | Charon | 1212 ± 3 | 19 571 ± 4 |
| Nix | 44-130 | 48 675 ± 120 | |||
| Kerberos[3] | 13-34 | 59 000 ± 2000 | |||
| Hydra | 44-130 | 64 780 ± 90 | |||
| (134860) 2000 OJ67 | Cubewano | 253? | S/2003 (134860) 1 | 175? | ~2300 |
| (136108) Haumea (planeta karłowata) | Cubewano | 1400 | Hiʻiaka | 310 | 49 500 ± 400 |
| Namaka | 170 | 39 300 | |||
| (136199) Eris (planeta karłowata) | SDO | 2400 | Dysnomia | 350 | 36 000 |
| (139775) 2001 QG298 | Plutonek | 260×205×185? | S/2004 (139775) 1 | 260×205×185? | ~240 |
| (148780) Altjira | Cubewano | 340? | S/2007 (148780) 1 | 264? | ~5800 |
| (160091) 2000 OL67 | Cubewano | 210? | S/2008 (160091) 1 | ? | ? |
| (160256) 2002 PD149 | Cubewano | ? | S/2007 (160256) 1 | ? | ? |
| (182933) 2002 GZ31 | SDO | 187? | S/2007 (182933) 1 | 118? | ~2100 |
| (208996) 2003 AZ84 | Plutonek | 686 +99/-96 | S/2007 (208996) 1 | 68 ± 20 | 7200 |
| 1998 WV24 | Plutonek | 110? | S/2008 (1998 WV24) 1 | 80? | 1400 |
| 1998 WW31 | Cubewano | 133 ± 15 | S/2000 (1998 WW31) 1 | 110 ± 12 | 22 300 ± 800 |
| 1999 OJ4 | Cubewano? | 168 | S/2005 (1999 OJ4) 1 | 93 | 2200 |
| 1999 RT214 | Cubewano | 120? | S/2006 (1999 RT214) 1 | ? | 3300 |
| 1999 RY214 | Cubewano | 125? | S/2009 (1999 RY214) 1 | 75? | 1800? |
| 1999 XY143 | Cubewano | 212? | S/2009 (1999 XY143) 1 | 178? | 2600? |
| 2000 CF105 | Cubewano | 170 | S/2001 (2000 CF105) 1 | 120 | 23 000 |
| 2000 CQ114 | Cubewano | 164? | S/2004 (2000 CQ114) 1 | 133 | 5880 ± 200 |
| 2000 QL251 | 176? | S/2006 (2000 QL251) 1 | 176? | 7000 | |
| 2000 WT169 | Cubewano | 205? | S/2009 (2000 WT169) 1 | 168? | 2800? |
| 2001 FL185 | Cubewano | 144? | S/2007 (2001 FL185) 1 | 100? | ~1900 |
| 2001 QC298 | Cubewano | 189 | S/2002 (2001 QC298) 1 | 155 | 3690 ± 70 |
| 2001 QQ322 | Cubewano | 280? | S/2008 (2001 QQ322) 1 | ? | ? |
| 2001 QW322 | Cubewano | 86 | S/2003 (2001 QW322) 1 | 86 | ~130 000 |
| 2001 QY297 | Cubewano | 282? | S/2007 (2001 QY297) 1 | 233? | ~2800 |
| 2001 RZ143 | Cubewano | 201? | S/2007 (2001 RZ143) 1 | 192? | ~1400 |
| 2001 XR254 | Cubewano | 241? | S/2007 (2001 XR254) 1 | 231? | ~3400 |
| 2002 VF130 | Cubewano | 126? | S/2008 (2002 VF130) 1 | 110? | 22000? |
| 2002 VT130 | Cubewano | 259? | S/2009 (2002 VT130) 1 | 211? | 2500? |
| 2002 XH91 | Cubewano | 284? | S/2008 (2002 XH91) 1 | 176? | 20 000? |
| 2003 QA91 | Cubewano | ? | S/2007 (2003 QA91) 1 | ? | ? |
| 2003 QR91 | ? | 187? | S/2007 (2003 QR91) 1 | 170? | ~1700 |
| (385446) Manwë | Cubewano | 265? | S/2006 (2003 QW111) 1 | ? | 10000 |
| 2003 QY90 | SDO | 196 | S/2003 (2003 QY90) 1 | 178 | 10 000 |
| 2003 TJ58 | Cubewano | 95? | S/2007 (2003 TJ58) 1 | 75? | ~3500 |
| 2003 UN284 | Cubewano | 127 | S/2003 (2003 UN284) 1 | 97 | 60 000 |
| 2003 WU188 | Cubewano | 256? | S/2007 (2003 WU188) 1 | 178? | ~1300 |
| 2003 YU179 | Cubewano | 147? | S/2009 (2003 YU179) 1 | 81 | ~2300 |
| 2004 PB108 | SDO | 210? | S/2007 (2001 FL185) 1 | 121? | ~5400 |
| 2005 EO304 | Cubewano | 240 | S/2005 (2005 EO304) 1 | ? | 85 000 |
| 2005 PR21 | Cubewano | 280? | S/2008 (2005 PR21) 1 | ? | ? |
| 2006 SF369 | SDO | 140? | S/2008 (2006 SF369) 1 | 140? | ~3000 |
| 2007 TY430 | Plutonek | 142? | S/2008 (2007 TY430) 1 | 142? | 13 000? |
| Planetoidy: pasa głównego • bliskie Ziemi • przecinające orbitę Marsa • trojańskie • centaury • transneptunowe |
Zobacz też
Przypisy
- ↑ Półoś wielka orbity księżyca
- ↑ Półoś wielka orbity księżyca
- ↑ Odkryty w 2011 roku.
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243 ida.jpg
This color picture is made from images taken by the imaging system on the Galileo spacecraft about 14 minutes before its closest approach to asteroid 243 Ida on August 28, 1993, at a distance of about 10,500 kilometers (6,500 miles). The images used are from the sequence in which Ida's moon was originally discovered; the moon is visible to the right of the asteroid. This picture is made from images through the 4100-ångström (violet), 7560 Å (infrared) and 9680 Å (infrared) filters. The color is 'enhanced' in the sense that the CCD camera is sensitive to near-infrared wavelengths of light beyond human vision; a 'natural' color picture of this asteroid would appear mostly gray. Shadings in the image indicate changes in illumination angle on the many steep slopes of this irregular body as well as subtle color variations due to differences in the physical state and composition of the soil (regolith). There are brighter areas, appearing bluish in the picture, around craters on the upper left end of Ida, around the small bright crater near the center of the asteroid, and near the upper right-hand edge (the limb). This is a combination of more reflected blue light and greater absorption of near infrared light, suggesting a difference in the abundance or composition of iron-bearing minerals in these areas. Ida's moon also has a deeper near-infrared absorption and a different color in the violet than any area on this side of Ida. The moon is not identical in spectral properties to any area of Ida in view here, though its overall similarity in reflectance and general spectral type suggests that it is made of the same rock types basically. These data, combined with study of further imaging data and more detailed spectra from the Near Infrared Mapping Spectrometer, may allow scientists to determine whether the larger parent body of which Ida, its moon, and some other asteroids are fragments was a heated, differentiated object or made of relatively unaltered primitive chondritic material.
This color picture is made from images taken by the imaging system on the Galileo spacecraft about 14 minutes before its closest approach to asteroid 243 Ida on August 28, 1993, at a distance of about 10,500 kilometers (6,500 miles). The images used are from the sequence in which Ida's moon was originally discovered; the moon is visible to the right of the asteroid. This picture is made from images through the 4100-ångström (violet), 7560 Å (infrared) and 9680 Å (infrared) filters. The color is 'enhanced' in the sense that the CCD camera is sensitive to near-infrared wavelengths of light beyond human vision; a 'natural' color picture of this asteroid would appear mostly gray. Shadings in the image indicate changes in illumination angle on the many steep slopes of this irregular body as well as subtle color variations due to differences in the physical state and composition of the soil (regolith). There are brighter areas, appearing bluish in the picture, around craters on the upper left end of Ida, around the small bright crater near the center of the asteroid, and near the upper right-hand edge (the limb). This is a combination of more reflected blue light and greater absorption of near infrared light, suggesting a difference in the abundance or composition of iron-bearing minerals in these areas. Ida's moon also has a deeper near-infrared absorption and a different color in the violet than any area on this side of Ida. The moon is not identical in spectral properties to any area of Ida in view here, though its overall similarity in reflectance and general spectral type suggests that it is made of the same rock types basically. These data, combined with study of further imaging data and more detailed spectra from the Near Infrared Mapping Spectrometer, may allow scientists to determine whether the larger parent body of which Ida, its moon, and some other asteroids are fragments was a heated, differentiated object or made of relatively unaltered primitive chondritic material.