Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 918.52 Earth masses
Surface gravity around 5.27 g
An orbital period of 1,919.000 days
Semi-major axis 3.2700 AU
Distance from Earth 181.09 light-years
Earth Similarity Index 0.393
Travel time at Voyager 1 speed 3,193,452 years

HD 103891 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.180 R♃

Mass

918.52 M⊕

Mass (Jupiter)

2.890 M♃

Density

2.19 g/cm³

Surface Gravity

5.27 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.393

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#847of 1771

top 47.8%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HD 103891 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	918.52	317.83
Density (g/cm³)	5.51	2.19	1.33
Surface Gravity (g)	1.00	5.27	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	918.524 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	457.673 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 103891

HIP

HIP 58331

TIC

TIC 183648073

Gaia DR2

Gaia DR2 3594183153331697408

Gaia DR3

Gaia DR3 3594183153334105216

System

HD 103891

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 918.524 M⊕ · percentile 65 / cohort 1747

Orbital period 1,919.00 d · percentile 84 / cohort 1533

Distance 55.52 pc · percentile 23 / cohort 1759

ESI 0.393 · percentile 84 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,919.000 days

Semi-major axis

3.2700 AU

Eccentricity

0.310

Inclination

27.40 °

Year Length

A year here lasts about 5.25 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.2700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.393

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Sreenivas et al. 2022

Instrument

HARPS Spectrograph

Publication

2022-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at La Silla Observatory (12 shown).

TOI-500 c · Sub-Neptune pi Men d · Sub-Neptune TOI-500 e · Sub-Neptune CoRoT-7 d · Neptune-like TOI-500 d · Neptune-like HD 69123 b · Gas Giant HD 114082 b · Gas Giant HD 64121 b · Gas Giant HD 22532 b · Gas Giant HD 29399 b · Gas Giant iot Dra c · Gas Giant HD 105779 b · Gas Giant

Host System: HD 103891

Spectral Class

F-type yellow-white

Effective Temperature

6,072 K — hotter than the Sun (5,778 K)

Estimated Age

3.68 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.220 R☉

Stellar Mass

1.280 M☉

Metallicity [Fe/H]

-0.19

Extended Stellar Properties

Surface gravity (log g)

3.790 dex

Stellar density

0.130 g/cm³

Rotational v·sin i

2.80 km/s

Activity index (log R'HK)

-5.200

Metallicity ratio

[Fe/H]

Distance

55.52 parsec

Light-years 181.09 ly

V-band magnitude

6.59 mag

Voyager-speed travel 3,193,452 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.984 mas

Total Proper Motion

110.362 mas/yr

PM Right Ascension

-108.23 mas/yr

PM Declination

21.60 mas/yr

Galactic Cartesian (pc)

x = -0.989 · y = 0.010 · z = -0.149

Equatorial (J2000)

RA 179.43829° · Dec -8.54862°

Galactic ℓ, b

281.029° · 52.025°

Ecliptic λ, β

182.904° · -8.062°

HTM-20 index

286607919