Getting there
Teleport to House Brimhaven, Tai Bwo Wannai Teleport.
Region: Karamja · Game coordinates: 2742, 3143
Is there a star here now?
Landing sites are fixed, but which one has a star on it changes constantly — one star per world, roughly every 90 minutes. The live map shows every star players have currently called, with its world, its estimated size and how long it has left. Search for Southwest of Brimhaven Poh there to see whether this site is active right now.
What to expect
Stars land at size 6 to 9 and wear down one size roughly every 7 minutes while somebody is mining. The Mining level you need is the size × 10 — 90 for a T9, 60 for a T6 — so a star called an hour ago may already have decayed past the point where it is worth the trip, or below the level you can mine at all. The mechanics guide covers sizes, stardust and rewards in full.
Other landing sites in Karamja
If this one is empty or already mined out, these are the closest alternatives — usually a shorter trip than a fresh teleport across the map.