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: http://www.iki.rssi.ru/solar/eng/helene.htm
Дата изменения: Thu Oct 16 01:00:29 1997 Дата индексирования: Tue Oct 2 05:06:05 2012 Кодировка: Поисковые слова: moon |
Helene was discovered by P. Laques and J. Lecacheus in 1980 through ground based observations. Helene is called a Dione Trojan satellite because it shares the same orbit as Dione at about 60 degrees ahead of its larger companion. Its diameter is about 36 x 32 x 30 kilometers (22 x 20 x 19 miles).
Views of Helene |
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Helene
This image of Helene was acquired by the Voyager 2 spacecraft on
August 25, 1981.
(Credit: Calvin J. Hamilton)
Copyright © 1997 by Calvin J. Hamilton. All rights reserved.