The A sharp dominant thirteenth chord is a 6-note chord consisting of the notes A#, C##, E#, G#, B# and F##.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as A#13.
Chords that are a subset of A#13. These contain less notes but all of them are included in A#13.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the A#13 chord. Feel free to save or share the image as needed.