Look at the stars, look how they shine for you..

So this is probably a coincidence, and now that Ivica has kindly posted the puzzle pieces, I need to focus on advancing, so I probably won't try to go further with this, but I noticed the following, an hour ago:

How do these numbers relate to each other?

Convert HEX to DECIMAL

I assumed the decimal number could be a spherical surface.

Calculated its radius.

But what came up was actually star names. With the prefix HD, and then what the radius of the spherical surface would be.

They are all on Simbad's most cited star objects.

7C2BAC1D HD12975
1CC28A903 HD24786
2AC30BE38 HD302234
52726803C HD41966
BF1D1DF06 HD63894