Planet HD 23439 Ab

Detailed information about planet HD 23439 Ab and its parameters.

Planet parameters Publications Observability Predictor

Planet

Name

HD 23439 Ab

Planet Status

Candidate

Discovered in

2020

Publication Status

—

Update

2024-06-28

Mass

—

Mass*sin(i)

0.029 (\pm 0.004)

M_J 1 publication

Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc

Semi-Major Axis

0.2131 (\pm 8e-05)

AU 1 publication

Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc

Orbital Period

45.68 (\begin{matrix} + 0.03 \\ - 0.02 \end{matrix})

day 1 publication

Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc

Eccentricity

0.5 (\pm 0.1)

1 publication

Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc

Angular distance

—

ω

-1.1 (\begin{matrix} + 0.3 \\ - 0.4 \end{matrix})

deg 1 publication

Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc

T_peri

—

Radius

—

Inclination

—

Detection Method

Radial Velocity

Mass Meas. Method

Radial Velocity

Radius Meas. Method

—

Primary transit

—

Secondary transit

—

λ

—

Impact Parameter b

—

Time V_r=0

—

Velocity Semiamplitude K

2.6 (\pm 0.4)

m/s 1 publication

Understanding the Impacts of Stellar Companions on Planet Formation and Evolution: A Survey of Stellar and Planetary Companions within 25 pc

Calculated temperature

—

Measured temperature

—

Hottest point longitude

—

Geometric albedo

—

Surface gravity log(g/g_H)

—

Alternate Names

—

Data Source	Type	Result Value	Result Figure	Notes	Reference

Molecule	Data Source	Type	Result Value	Result Figure	Notes	Reference

No remarks

No link

Star

Name

HD 23439 A

Distance

23.8899 (\pm 0.02315)

pc 1 publication

The Revised TESS Input Catalog and Candidate Target List

Spectral type

K2V

Apparent magnitude V

8.12

Apparent magnitude I

—

Apparent magnitude J

—

Apparent magnitude H

—

Apparent magnitude K

—

Mass

0.86 (\pm 0.103)

M_Sun 1 publication

The Revised TESS Input Catalog and Candidate Target List

Age

—

Effective temperature

5098.53 (\pm 103.519)

K 1 publication

The Revised TESS Input Catalog and Candidate Target List

Radius

0.723 (\pm 0.0372)

R_Sun 1 publication

The Revised TESS Input Catalog and Candidate Target List

Metallicity [Fe/H]

-1.05119 (\pm 0.0166)

1 publication

The Revised TESS Input Catalog and Candidate Target List

Detected Disc

—

Magnetic Field

—

RA₂₀₀₀

03:47:02.1

Dec₂₀₀₀

+41:25:38.1

Alternate Names

*V580 Per, GJ 1064 A, GJ 9130 A

HD 23439 forms a widely separated (a ~ 170 AUs) binary system with a K3 dwarf companion star.
An et al. (2025) report a third low-mass (m_C = 0.1_-0.056^+0.12 M_Sol) companion star in highly eccentric orbit (a = 39_-17⁺⁴³ AUs, e = 0.7_-0.2^+0.18), which makes the system triple.