Exoplanet

HD 17156 b

Orbiting HD 17156

Overview

HD 17156 b is an exoplanet orbiting the star HD 17156, discovered in 2007 using the Radial Velocity method. It is a Jupiter-sized world.

Key Measurements

Radius

12.26

Earth radii

015 R⊕

Mass

1036.12

Earth masses

0500 M⊕

Orbital Period

21.2

days

0.1d10,000d

Distance

78.1

parsecs

Nearby10,000 pc

Equilibrium Temp

888

K

150 K3,500 K

Radius (Earth radii)

12.26

Mass (Earth masses)

1036.12

Measured

Equilibrium Temperature

888 K

Parameter source: Kane et al. 2023

Orbital Period

21.216+0.000−0.000days

Semi-Major Axis

0.1632+0.0027−0.0027au

Planet Mass (Earth masses)

1036.12+34.96−34.96

Planet Mass (Jupiter masses)

3.2600+0.1100−0.1100

Eccentricity

0.6772+0.0045−0.0044

Epoch of Periastron

2458788.13+0.01−0.01days(BJD-TDB)

Argument of Periastron

122.1+0.4−0.4deg

Radial Velocity Semi-Amplitude

274.50+2.50−2.30m/s

Distance from Earth

78.1 pc (~255 ly)

Spectral Type

Unknown

Temperature

6046 K

Mass (Solar)

1.28 M☉

Radius (Solar)

1.52 R☉

Luminosity

0.44 log L☉

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

42.4366°, 71.7531°

Discovery Method

Radial Velocity

Discovery Year

2007

Data Sources
NASA Exoplanet Archive

Source ID: HD 17156 b

System Context

HD 17156 b orbits HD 17156 and was reported in 2007 and was detected with the Radial Velocity method.

Published measurements list a radius of 12.26 Earth radii, a mass of 1,036.12 Earth masses, an orbital period of 21.22 days, and an equilibrium temperature near 888 K.

Catalog data places the system at about 78.1 parsecs from Earth and 1 known planet in the system.

Host star

Explore the stellar record for this system to compare temperature, spectral type, and known planets.

Open HD 17156