HD 20794 d is a super-Earth exoplanet orbiting the star HD 20794, also known as 82 G. Eridani.

Here's a brief summary of its characteristics:

Type: Super-Earth (meaning it's larger and more massive than Earth, but smaller than ice giants like Neptune).

Mass: About 6 times the mass of Earth.

Host star: HD 20794, a G-type main-sequence star, similar to our Sun but slightly cooler and less massive.

Location: Located just 20 light-years away, making it relatively close for astronomical study.

Orbit: Highly eccentric orbit, meaning it moves in and out of the habitable zone of its star. This causes significant temperature fluctuations.

Habitable Zone: While its orbit traverses the habitable zone, the dramatic temperature variations may challenge the potential for liquid water and life.

Discovery: Confirmed in 2024 through analysis of data from the HARPS and ESPRESSO spectrographs.

Significance: A prime target for future missions to study exoplanet atmospheres and search for biosignatures, helping us understand the conditions that might support life beyond Earth.