Key parameters at a glance

A radius of 3.35 Earth radii
A mass of 11.20 Earth masses
Surface gravity around 1.00 g
An orbital period of 120.878 days
Semi-major axis 0.4390 AU
Distance from Earth 86.43 light-years
Earth Similarity Index 0.603
Travel time at Voyager 1 speed 1,524,199 years

HD 103949 b Planet Profile

Physical Specs

Radius

3.35 R⊕

Radius (Jupiter)

0.299 R♃

Mass

11.20 M⊕

Mass (Jupiter)

0.035 M♃

Density

1.64 g/cm³

Surface Gravity

1.00 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.603

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Las Campanas Observatory

Telescope 6.5 m Magellan II Clay Telescope

Size rank in cohort

Rank by radius

#250of 1978

top 12.6%

This planet

3.35R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-609 b 3.35 R⊕ Kepler-1451 b 3.35 R⊕ HD 13808 b 3.35 R⊕

Metric	Earth	HD 103949 b	Jupiter
Radius (R⊕)	1.00	3.35	11.21
Mass (M⊕)	1.00	11.20	317.83
Density (g/cm³)	5.51	1.64	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	11.200 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 103949

HIP

HIP 58374

TIC

TIC 428657118

Gaia DR2

Gaia DR2 3492633633781166336

Gaia DR3

Gaia DR3 3492633633781166336

System

HD 103949

Percentile among Sub-Neptune cohort

Radius 3.350 R⊕ · percentile 87 / cohort 1978

Mass 11.200 M⊕ · percentile 81 / cohort 1978

Orbital period 120.88 d · percentile 95 / cohort 1946

Distance 26.50 pc · percentile 6 / cohort 1975

ESI 0.603 · percentile 83 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

120.878 days

Semi-major axis

0.4390 AU

Eccentricity

0.190

Inclination

— °

Year Length

A year here lasts approximately 120.88 Earth days (33.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.4390 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.603

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2019

Instrument

Carnegie Planet Finder Spectrograph

Publication

2019-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Las Campanas Observatory (12 shown).

HD 39855 b · Sub-Neptune HIP 54373 b · Sub-Neptune HD 24085 b · Sub-Neptune HIP 54373 c · Sub-Neptune HIP 35173 b · Sub-Neptune HD 211970 b · Sub-Neptune HD 64114 b · Neptune-like HIP 71135 b · Neptune-like HD 206255 b · Neptune-like HD 21411 b · Neptune-like HD 8326 b · Neptune-like HD 102843 b · Gas Giant

Host System: HD 103949

Spectral Class

K-type orange

Effective Temperature

4,792 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.753 R☉

Stellar Mass

0.770 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.591 dex

Stellar density

2.705 g/cm³

Systemic radial velocity

-10.28 km/s

Metallicity ratio

[M/H]

Distance

26.50 parsec

Light-years 86.43 ly

V-band magnitude

8.70 mag

Voyager-speed travel 1,524,199 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

37.708 mas

Total Proper Motion

181.189 mas/yr

PM Right Ascension

-172.81 mas/yr

PM Declination

-54.46 mas/yr

Galactic Cartesian (pc)

x = -0.914 · y = 0.007 · z = -0.406

Equatorial (J2000)

RA 179.54796° · Dec -23.92412°

Galactic ℓ, b

287.579° · 37.355°

Ecliptic λ, β

189.602° · -22.020°

HTM-20 index

927854332

Similar Worlds

HD 13808 b

Sub-Neptune · K-type orange

Radius 3.35 R⊕ · 92.1 ly

Kepler-1083 b

Sub-Neptune · K-type orange

Radius 3.36 R⊕ · 2,944.0 ly

TOI-1472 c

Sub-Neptune · K-type orange

Radius 3.33 R⊕ · 397.4 ly

Kepler-1270 b

Sub-Neptune · K-type orange

Radius 3.32 R⊕ · 3,571.6 ly

Kepler-533 b

Sub-Neptune · K-type orange

Radius 3.38 R⊕ · 988.1 ly

Kepler-411 d

Sub-Neptune · K-type orange

Radius 3.32 R⊕ · 501.2 ly

Explore Related Categories

Sub-Neptune Planets Radial Velocity Discoveries Las Campanas Observatory Mission K-type orange Hosts