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Stellar HostProfile

HD 18438

M2.5 III • 224.1 pc

Records

2

literature rows

Planets

1

system count

References

3

distinct source labels

HIP: HIP 14417HD: HD 18438TIC: TIC 297820335

Approximate color

from effective temperature

Canonical Summary

Adopted host values from one source row

Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.

Stellar source: Lee et al. 2023 • System source: TICv8

Temperature

3860 K

3854 to 3860

2 values • 2 distinct

Mass

1.84 Msun

single adopted value

1 values • 1 distinct

Radius

88.47 Rsun

70.84 to 88.47

2 values • 2 distinct

Age

5.50 Gyr

single adopted value

1 values • 1 distinct

Luminosity

2.97 log(Lsun)

single adopted value

1 values • 1 distinct

Distance

224.1 pc

single adopted value

2 values • 1 distinct

Spectral Type

M2.5 III

Consistent across records

M2.5 III (1)

Planets

1

Stable across source rows

1

Scale Comparison

Radius against the Sun

Current adopted radius: 88.47 R☉ (circles scaled linearly by radius)

Sun

1.0 R☉ baseline

HD 18438

88.47 R☉

System Layout

Known planets

1 planets linked to this host

HD 18438 b

Radial Velocity

◌

Discovery

2023

Period

803 days

Radius

—

Mass

6674.4 M⊕

Eq. Temp

—

HD 18438 and Its Planet

HD 18438 is an M2.5 III star 731 light-years from Earth. Its spectral type places it among the coolest and reddest stars, and the star is 5.5 billion years old. It is more massive than the Sun at 1.84 solar masses and much larger at 88.5 solar radii. Its temperature of 3860 K is cooler than the Sun's.

One planet orbits this host. HD 18438 b was discovered in 2023 by the radial velocity method, which tracks the wobble a planet's gravity induces in its star. The planet has a minimum mass of 6670 Earth masses, roughly 21 times Jupiter's mass and larger than Earth's. It completes one orbit every 803 days.

Provenance

Underlying measurements and references

Download JSONDownload CSV

Evidence Summary

Rows

2

Stellar refs

2

System refs

1

Distancestable

2 values • 1 distinct

Parallaxstable

2 values • 1 distinct

Temperaturedisputed

2 values • 2 distinct

Massstable

1 values • 1 distinct

Radiusdisputed

2 values • 2 distinct

Agestable

1 values • 1 distinct

Luminositystable

1 values • 1 distinct

Surface Gravitystable

1 values • 1 distinct

Metallicitystable

1 values • 1 distinct

Spectral Typestable

1 values • 1 distinct

ST TEFFST MASSST RADST AGEST LUMST SPECTYPESY DISTStellar RefSystem Ref
38601.8488.475.502.97M2.5 III224.1Lee et al. 2023TICv8
3854—70.84———224.1TICv8TICv8