Key parameters at a glance

A radius of 11.90 Earth radii
A mass of 9,045.40 Earth masses
Surface gravity around 63.88 g
An orbital period of 10,942.290 days
Semi-major axis 10.0870 AU
Distance from Earth 133.44 light-years
Earth Similarity Index 0.250
Travel time at Voyager 1 speed 2,353,206 years

HD 26161 b Planet Profile

Physical Specs

Radius

11.90 R⊕

Radius (Jupiter)

1.060 R♃

Mass

9,045.40 M⊕

Mass (Jupiter)

28.460 M♃

Density

29.50 g/cm³

Surface Gravity

63.88 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.250

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1526of 1771

top 86.1%

This planet

11.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

2MASS J22501512+2325342 b 11.90 R⊕ KMT-2020-BLG-0414L c 11.90 R⊕ DENIS-P J082303.1-491201 b 11.90 R⊕

Metric	Earth	HD 26161 b	Jupiter
Radius (R⊕)	1.00	11.90	11.21
Mass (M⊕)	1.00	9,045.40	317.83
Density (g/cm³)	5.51	29.50	1.33
Surface Gravity (g)	1.00	63.88	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9,045.396 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	4,290.683 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 26161

HIP

HIP 19428

TIC

TIC 467753728

Gaia DR2

Gaia DR2 169149766470219520

Gaia DR3

Gaia DR3 169149766470219520

System

HD 26161

Percentile among Gas Giant cohort

Radius 11.900 R⊕ · percentile 13 / cohort 1771

Mass 9,045.396 M⊕ · percentile 100 / cohort 1747

Orbital period 10,942.29 d · percentile 96 / cohort 1533

Distance 40.91 pc · percentile 14 / cohort 1759

ESI 0.250 · percentile 45 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

10,942.290 days

Semi-major axis

10.0870 AU

Eccentricity

0.922

Inclination

59.56 °

Year Length

A year here lasts about 29.96 Earth years on a highly eccentric trajectory at a mean orbital distance of 10.0870 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

529.099 m/s

Transit mid-time (BJD)

2,460,540.0000

Long. of periastron (ω)

8.51°

Angular separation (arcsec)

247.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.250

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Rosenthal et al. 2021

Instrument

Multiple Instruments

Publication

2021-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Multiple Observatories (12 shown).

L 98-59 e · Super-Earth GJ 393 b · Rocky Terrestrial HD 168009 b · Sub-Neptune HD 164922 e · Sub-Neptune HD 95735 c · Sub-Neptune HD 141004 b · Sub-Neptune HD 107148 c · Neptune-like TOI-178 f · Sub-Neptune TYC 0434-04538-1 b · Gas Giant HIP 56640 b · Gas Giant HD 137496 c · Gas Giant HD 156668 c · Neptune-like

Host System: HD 26161

Spectral Class

F-type yellow-white

Effective Temperature

6,058 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.456 R☉

Stellar Mass

1.120 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

4.164 dex

Stellar density

0.530 g/cm³

Metallicity ratio

[Fe/H]

Distance

40.91 parsec

Light-years 133.44 ly

V-band magnitude

6.89 mag

Voyager-speed travel 2,353,206 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

24.413 mas

Total Proper Motion

95.038 mas/yr

PM Right Ascension

64.17 mas/yr

PM Declination

70.10 mas/yr

Galactic Cartesian (pc)

x = 0.394 · y = 0.754 · z = 0.525

Equatorial (J2000)

RA 62.41223° · Dec 31.65243°

Galactic ℓ, b

164.956° · -14.608°

Ecliptic λ, β

66.364° · 10.449°

HTM-20 index

2017363416