Astronaut Christina Koch captured from ISS Southern Cross or Crux.

Credit: Christina Koch, NASA

Crux is a constellation centred on 4 stars in the southern sky in a bright portion of the Milky Way. It is among the most easily distinguished constellations as its hallmark (asterism) stars each have an apparent visual magnitude brighter than +2.8, even though it is the smallest of all 88 modern constellations. Its name is Latin for cross, and it is dominated by a cross-shaped or kite-like asterism that is commonly known as the Southern Cross. Crux can mostly be observable in the southern hemisphere.

Crux is shown as follows.

Credit: Wikipedia
Credit: Super Grover

Reference: Christina Koch’s Tweet
See earthview photo gallery: LiVEARTH