Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 3,082.32 Earth masses
Surface gravity around 19.73 g
An orbital period of 685.250 days
Semi-major axis 1.6230 AU
Distance from Earth 298.22 light-years
Earth Similarity Index 0.388
Travel time at Voyager 1 speed 5,259,117 years

HD 38801 b Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,082.32 M⊕

Mass (Jupiter)

9.698 M♃

Density

8.67 g/cm³

Surface Gravity

19.73 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.388

HZ Position Unknown

Controversial No

Discovery

Year 2009

Method Radial Velocity

Facility Subaru Telescope

Telescope 8.2 m Subaru Telescope

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	HD 38801 b	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	3,082.32	317.83
Density (g/cm³)	5.51	8.67	1.33
Surface Gravity (g)	1.00	19.73	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	3,082.315 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 38801

HIP

HIP 27384

TIC

TIC 66650754

Gaia DR2

Gaia DR2 3012677738601895168

Gaia DR3

Gaia DR3 3012677738601895168

System

HD 38801

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 3,082.315 M⊕ · percentile 87 / cohort 1747

Orbital period 685.25 d · percentile 72 / cohort 1533

Distance 91.43 pc · percentile 33 / cohort 1759

ESI 0.388 · percentile 82 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

685.250 days

Semi-major axis

1.6230 AU

Eccentricity

0.017

Inclination

— °

Year Length

A year here lasts about 1.88 Earth years on a nearly circular orbit at a mean orbital distance of 1.6230 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.388

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Harakawa et al. 2010

Instrument

HDS Spectrograph

Publication

2010-05

Observation locale

Ground

Host System: HD 38801

Spectral Class

K-type orange

Effective Temperature

5,338 K — cooler than the Sun (5,778 K)

Estimated Age

6.07 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

2.029 R☉

Stellar Mass

1.207 M☉

Metallicity [Fe/H]

0.25

Extended Stellar Properties

Surface gravity (log g)

3.877 dex

Systemic radial velocity

-25.10 km/s

Rotational v·sin i

1.87 km/s

Rotation period

47.00 days

Metallicity ratio

[Fe/H]

Distance

91.43 parsec

Light-years 298.22 ly

V-band magnitude

8.26 mag

Voyager-speed travel 5,259,117 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

10.908 mas

Total Proper Motion

95.169 mas/yr

PM Right Ascension

-57.74 mas/yr

PM Declination

-75.65 mas/yr

Galactic Cartesian (pc)

x = 0.052 · y = 0.988 · z = -0.145

Equatorial (J2000)

RA 86.99631° · Dec -8.32803°

Galactic ℓ, b

213.268° · -17.863°

Ecliptic λ, β

86.501° · -31.731°

HTM-20 index

1611804106

Observation Record

Photometric series

RV measurements

Stellar spectra

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Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Subaru Telescope Mission K-type orange Hosts