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・ 258th (Canadien-Français) Battalion, CEF
・ 258th Aero Squadron
・ 258th Field Artillery Regiment
・ 258th Infantry Division (Wehrmacht)
・ 258th Tunnelling Company
・ 25 øre (World War II Danish coin)
・ 25-30 Alliance
・ 25-hydroxycholesterol 7α-hydroxylase
・ 25-Hydroxyvitamin D3 1-alpha-hydroxylase
・ 25-pair color code
・ 25/8
・ 25/8 (song)
・ 250
・ 250 (number)
・ 250 BC
250 Bettina
・ 250 Delaware Avenue
・ 250 Douglas Place
・ 250 Mannin no Kanken Wii de Tokoton Kanji Nou
・ 250 nanometer
・ 250 prosent
・ 250 Richmond Street West
・ 250 South Street
・ 250 Vesey Street
・ 250 West 90th Street
・ 250 West Pratt Street
・ 25000 Astrometria
・ 25088 Yoshimura
・ 250s
・ 250s BC


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250 Bettina : ウィキペディア英語版
250 Bettina

250 Bettina is a large main belt asteroid that was discovered by Austrian astronomer Johann Palisa on September 3, 1885 in Vienna. It was named in honour of Baroness Bettina von Rothschild, the wife of the prominent Viennese banker Albert Salomon von Rothschild who had bought the naming rights for £50.〔Observatory, vol. 8, p. 63, 1885 & vol. 9, p. 142, 1886; see also The Guinness Book of Astronomy Facts and Feats Patrick Moore page 96 ISBN 0-900424-76-1〕 Based upon the spectrum, it is classified as an M-type asteroid.
In 1988, the asteroid was observed from the Collurania-Teramo Observatory, allowing a light curve to be produced that showed "an irregular behavior with a deeper minimum and a narrower maximum". The data showed a rotation period of 5.055 hours and a brightness variation of 0.17 ± 0.01 in magnitude. The ratio of the lengths of the major to minor axes for this asteroid were found to be 1.51 ± 0.03.〔
== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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