Key parameters at a glance

A radius of 13.90 Earth radii
A mass of 274.91 Earth masses
Surface gravity around 1.42 g
An orbital period of 19.382 days
Semi-major axis 0.1540 AU
Distance from Earth 259.46 light-years
Earth Similarity Index 0.296
Travel time at Voyager 1 speed 4,575,612 years

1 sibling around HD 13908

HD 13908 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 13908 b this	Gas Giant	13.90	274.91	19.382	—	2013
HD 13908 c	Gas Giant	12.80	1,630.40	931.000	—	2013

HD 13908 b Planet Profile

Physical Specs

Radius

13.90 R⊕

Radius (Jupiter)

1.240 R♃

Mass

274.91 M⊕

Mass (Jupiter)

0.865 M♃

Density

0.56 g/cm³

Surface Gravity

1.42 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.296

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#456of 1771

top 25.7%

This planet

13.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

24 Sex c 13.90 R⊕ HD 148156 b 13.90 R⊕ HD 134987 c 13.90 R⊕

Metric	Earth	HD 13908 b	Jupiter
Radius (R⊕)	1.00	13.90	11.21
Mass (M⊕)	1.00	274.91	317.83
Density (g/cm³)	5.51	0.56	1.33
Surface Gravity (g)	1.00	1.42	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	274.910 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 13908

HIP

HIP 10743

TIC

TIC 12906712

Gaia DR2

Gaia DR2 515574853541230720

Gaia DR3

Gaia DR3 515574853541230720

System

HD 13908

Percentile among Gas Giant cohort

Radius 13.900 R⊕ · percentile 72 / cohort 1771

Mass 274.910 M⊕ · percentile 30 / cohort 1747

Orbital period 19.38 d · percentile 47 / cohort 1533

Distance 79.55 pc · percentile 30 / cohort 1759

ESI 0.296 · percentile 57 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

19.382 days

Semi-major axis

0.1540 AU

Eccentricity

0.020

Inclination

— °

Year Length

A year here lasts approximately 19.38 Earth days (5.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1540 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.296

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Moutou et al. 2014

Instrument

SOPHIE Spectrograph

Publication

2014-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2013 at Haute-Provence Observatory (5 shown).

HD 13908 c · Gas Giant HD 113337 b · Gas Giant HD 159243 c · Gas Giant HD 159243 b · Gas Giant HIP 91258 b · Gas Giant

Host System: HD 13908

Spectral Class

F-type yellow-white

Effective Temperature

6,255 K — hotter than the Sun (5,778 K)

Estimated Age

2.90 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.670 R☉

Stellar Mass

1.290 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.110 dex

Stellar density

0.236 g/cm³

Systemic radial velocity

15.88 km/s

Rotational v·sin i

4.20 km/s

Metallicity ratio

[Fe/H]

Distance

79.55 parsec

Light-years 259.46 ly

V-band magnitude

7.52 mag

Voyager-speed travel 4,575,612 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.542 mas

Total Proper Motion

45.383 mas/yr

PM Right Ascension

22.95 mas/yr

PM Declination

-39.15 mas/yr

Galactic Cartesian (pc)

x = 0.340 · y = 0.234 · z = 0.911

Equatorial (J2000)

RA 34.56091° · Dec 65.59419°

Galactic ℓ, b

131.745° · 4.219°

Ecliptic λ, β

59.479° · 47.924°

HTM-20 index

-103340305