B1950.0
因为恒星的赤经和赤纬会因岁差的原因而改变,天文学家经常指定某一特定的纪元作为参考点。B1950.0标准已经被继任标准J2000.0纪元所取代,J2000.0是现在使用的纪元标准。
前缀"B"代表这是一个贝塞耳纪元,而非儒略纪元。
参考
- S. Aoki, et al., "Conversion matrix of epoch B 1950.0 FK 4-based positions of stars to epoch J 2000.0 positions in accordance with the new IAU resolutions", Astron. Astrophys. 128(2), 263–267, (1983).
- E. M. Standish, "Conversion of positions and proper motions from B1950.0 to the IAU system at J2000.0", Astron. Astrophys. 115(1), 20–22, (1982).
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.