From The Stargate Omnipedia


World once controlled by the Goa'uld System Lord Nirrti. The humans there lived in relative peace, until one of Nirrti's terrible experiments wiped out the entire civilization -- except for one young girl, Cassandra, who went to live on Earth. The planet is now abandoned.

Stargate Command's designation for Hanka is P8X-987.


HOME TO - Population Annihilated
FIRST APPEARED - Singularity


Singularity - A single girl is the sole survivor of Hanka's 1,000-plus population after an unexplainable phenomenon wipes the world of human life.
Rite of Passage - When Cassandra falls mysteriously ill, SG-1 returns to Hanka to uncover Nirrti's secret laboratory, where she orchestrated the destruction of the population in an attempt to create an advanced human host.