| 翻訳と辞書 |
| 1946 Walraven ： ウィキペディア英語版 |
1946 Walraven
1946 Walraven, provisional designation 1931 PH, is a stony asteroid from the inner regions of the asteroid belt. It was discovered by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa on 8 August 1931.〔
The S-type asteroid measures about 10 kilometers in diameter. It orbits the Sun at a distance of 1.8–2.8 AU once every 3.47 years (1,269 days). It has a rather long rotation period of 10.2 hours.〔〔 Its geometric albedo is and 0.2, according to preliminary results from the NEOWISE mission and assumptions made by the Light Curve Database project, respectively.〔〔 For a main-belt asteroid, ''Walraven'' shows a relatively high eccentricity of 0.23. Its orbit is inclined by 8 degrees to the plane of the ecliptic.〔
The asteroid was named in honor of astronomer and pioneer in optical instrumentation and precision photometry, Theodore Walraven (1916–2008),〔 who was a professor at the Leiden University and for many years resident astronomer at the former Leiden Southern Station near Hartbeespoortdam, South Africa. He constructed special photometers for the telescopes at the station, including the 5-color photometer for which he developed the ''Walraven photometric system''.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「1946 Walraven」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|