| 释义 |
星等xīngděng表示星体亮度的等级,亮度越大,等数越小。根据肉眼看到的星体的亮度而定的等级,叫做视星等,如太阳的视星等为-26.7,天狼星的视星等为-1.6。根据星体在距离观测者10秒差距(即32.6光年)时应有的亮度而定的等级,叫做绝对星等,如太阳的绝对星等为＋4.9,天狼星的绝对星等为＋1.3。{magnitude; number representing the apparent brightness of a celestial body. The brighter the star, the smaller its magnitude. The number representing the brightness of a celestial body visible to the naked eye is called apparent magnitude. For example, the magnitude of the sun is -26.7 and that of the Sirius is -1.6. The apparent magnitude a star would have at a distance of 10 parsecs (or 32.6 light-years) from the observer is called absolute magnitude. For example, the absolute magnitude of the sun is ＋4.9 and that of the Sirius is ＋1.3.} |