Shading the others at apparent magnitude 3.8 is Alpha Apodis, an orange giant that has around 48 times the diameter and 928 times the luminosity of the Sun. 

这是一个倒装句。主语为 Alpha Apodis，逗号后为主语的同位语。由于主语+同位语使得主语很长，为了避免头重脚轻，主语后移至句末，现在分词短语 Shading the others at apparent magnitude 3.8 前置与is 之前。构成完全倒装句。

如果不到装的话，句子如下：

Alpha Apodis, an orange giant that has around 48 times the diameter and 928 times the luminosity of the Sun, is shading the others at apparent magnitude 3.8