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太阳向点

太阳向点位置(红圈)

太阳向点太阳在星际空间运动时按本地静止标准(LSR)所对着的方向。这不应与太阳通过黄道带星座的视运动混淆,因为太阳通过黄道带星座的视运动是假想的运动,并不实际发生,而是由地球绕太阳公转产生的。

太阳向点的大致方向是武仙座附近的织女一西南向。太阳向点可以选取多个坐标,视觉坐标(由视运动的目视观测获得)为赤经(RA)18h 28m 0s赤纬(dec)+30°(银道坐标:银经56.24°,银纬22.54°)。

太阳向太阳向点运动的速度是19.5千米/秒。这不能与太阳围绕的银心轨道速度混淆。太阳围绕的银心轨道速度约为220千米/秒,包含在本地静止标准的运动中。太阳在银河系中的运动比直接的想像要复杂[1]

太阳运动的本性和范围最初于1783年由威廉·赫歇尔阐述。[2]

太阳背点是太阳向点的相反方向,位于大犬座孙增一附近。

参考资料

  1. ^ (英文)Priscilla Frisch (2000). "The Galactic Environment of the Sun"[永久失效链接], American Scientist.
  2. ^ (法文)Histoire de l'astronomie vol. 5, 1964 (le cercle du Bibliophile et Erik Nitsche)
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太阳向点
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