在進行八色小行星巡天(ECAS)時,大衛·J·托倫和Edward F. Tedesco于1980年9月16日測量了艾女星的反射光譜。[9]其光譜分析與S-型小行星相符。[10][11]美國海軍天文臺弗拉格斯塔夫站及橡樹嶺天文臺在1993年初對艾女星作了許多觀測,進一步確定艾女星繞太陽的公轉軌道,並将伽利略號掠過時其位置的誤差從78公里减小到60公里。[12]
一顆細小的衛星繞艾女星公轉,名「艾卫」。其正式編號為(243) Ida I Dactyl,是從伽利略號探测器于1993年掠過時拍攝的照片中發現的。這批照片第一次直接證實了小行星衛星的存在。[28]當時它距離艾女星90公里(56英里),以順行軌道公轉。艾卫的表面和艾女星一樣由許多撞擊坑覆蓋,並且成份相近。其來源並不確定,但從探测器的觀測顯示它是鴉女星族原星碎片之一。
Nearly a month after a successful photo session, the Galileo spacecraft last week finished radioing to Earth a high-resolution portrait of the second asteroid ever to be imaged from space. Known as 243 Ida, the asteroid was photographed from an average distance of just 3,400 kilometers some 3.5 minutes before Galileo's closest approach on Aug. 28.
The chondrites fall naturally into five composition classes, of which three have very similar mineral contents, but different proportions of metal and silicates. All three contain abundant iron in three different forms (ferrous iron oxide in silicates, metallic iron, and ferrous sulfide), usually with all three abundant enough to be classified as potential ores. all three contain feldspar (an aluminosilicate of calcium, sodium, and potassium), pyroxene (silicates with one silicon atom for each atom of magnesium, iron, or calcium), olivine (silicates with two iron or magnesium atoms per silicon atom), metallic iron, and iron sulfide (the mineral triolite). These three classes, referred to collectively as the ordinary chondrites, contain quite different amounts of metal.
When Zeus was born, Rhea entrusted the guardianship of her son to the Dactyls of Ida, who are the same as those called Curetes. They came from Cretan Ida – Heracles, Paeonaeus, Epimedes, Iasius and Idas.
^Petit et al. 1997,第182頁 harvnb模板錯誤: 無指向目標: CITEREFPetitDurdaGreenbergHurford1997 (幫助)
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