HD 278555 b
A confirmed exoplanet orbiting HD 278555.
Compared with Earth
- Size
- About 11 times Earth's width.
- Mass
- About 267 times Earth's mass.
- Temperature
- About 580 °C (1,076 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 29 Earth days.
Planet
- Radius
- 11.03 × Earth
- Mass
- 267 × Earth
- Density
- 1.09 g/cm³
- Equilibrium temperature
- 853 K
- Starlight received
- Unknown
- Orbital period
- 28.84 days
- Average distance from its star
- 0.1985 AU
Star
- Host star
- HD 278555
- Spectral class
- F — yellow-white
- Surface temperature
- 6,047 K
- Radius
- 1.624 × Sun
- Mass
- 1.255 × Sun
- Age
- 3.8 billion years
System
- Distance from Earth
- 945.3 light-years (289.8 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2026
- Method
- Transit
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
Data from the NASA Exoplanet Archive, synced October 14, 2026.