There isn't one specific "yellow star in the sky" with a common name like a planet.

Here's why:

* Many Stars are Yellow: A lot of stars appear yellow, especially those similar to our own Sun.

* Location Matters: The apparent color of a star can change depending on how far away it is and the conditions in Earth's atmosphere.

* Our Sun: The brightest star in our sky, the Sun, is a yellow dwarf star.

If you're looking for a specific star, you'll need to provide more information, such as:

* Location in the sky: What constellation is it near?

* Brightness: Is it very bright or faint?

* Time of year: When did you see it?

With more information, I can help you identify the specific yellow star you're thinking of!