Klaestron IV was the inhabited fourth planet of its star system and the homeworld of the Klaestrons, a warp-capable humanoid species. The planet was unified under a single government from a capital city. An extradition treaty existed between the governments of Klaestron IV and the Federation; however, Klaestron IV had no extradition treaty with Bajor.

In the 24th century, the planet was witness to the Klaestron Civil War. During the civil war, the capital city was the location of a military headquarters. In 2339, General Ardelon Tandro was ambushed and killed on the route from the capital to the front. Subsequently, he was elevated to national hero and his enraged troops ended the war with a victory. A lasting result of the civil was that statues of the general were erected at many place on the planet.

Outside the capital, there was an inn where Curzon Dax and Enina Tandro spent some time. (DS9: "Dax")

In 2371, Julian Bashir visited Klaestron IV to learn a new treatment for burn victims. According to him, the technology had to be seen to be believed. (DS9: "Second Skin")

The image of the surface of Klaestron IV shown in "Dax", was one of many reuses of the matte painting for Angel I. However, the image of Klaestron IV at night had a new building, that wasn't present in the day shot of Angel I, and was so forgotten in the day shot of Klaestron IV.
According to, the pronunciation for Klaestron is "CLAY-stron". However, according to the script for "Dax", the pronunciation was "KLY-stron".
According to Star Trek: Star Charts (p. 47; "United Federation of Planets I") and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), the Klaestron system was located in the Alpha Quadrant. The primary was a K-class star. Klaestron IV was listed as a Federation member in 2378.

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