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HD 278555 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 278555 b

Confirmed exoplanet · Gas Giant

HD 278555 b

Orbiting HD 278555

Discovered in 2026 using Transit. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic gas giant catalog artwork; not a direct image of HD 278555 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,026
Method: Transit
Radius: 11.029637 R⊕
Mass: 266.975862 M⊕
Orbit: 28.842438 days
Distance: 289.829 pc

Planet profile

Orbit and physical properties

Orbital period: 28.842438 days
Semi-major axis: 0.1985 AU
Eccentricity: 0.085
Radius: 11.029637 Earth radii
Mass: 266.975862 Earth masses
Mass provenance: Mass
Density: 1.09 g/cm³
Equilibrium temperature: 853 K
Insolation: 79.4371 Earth flux

Host system

Star and system properties

Host star: HD 278555
Stars in system: 1
Known planets in system: 1
Spectral type: F8
Stellar temperature: 6,047 K
Stellar radius: 1.624 R☉
Stellar mass: 1.255 M☉
Stellar metallicity: 0.269 dex
Stellar age: 3.8 Gyr
Distance: 289.829 parsecs
Right ascension: 03h21m28.33s
Declination: +32d54m49.72s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,026
Publication date: 2026-09
Discovery locale: Space
Facility: Transiting Exoplanet Survey Satellite (TESS)
Telescope: 0.1 m TESS Telescope
Instrument: TESS CCD Array
NASA Exoplanet Archive: Open composite record ↗

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