Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,789.38 Earth masses
Surface gravity around 10.92 g
An orbital period of 433.700 days
Semi-major axis 1.0900 AU
Distance from Earth 766.61 light-years
Earth Similarity Index 0.436
Travel time at Voyager 1 speed 13,519,226 years

HD 11755 b Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,789.38 M⊕

Mass (Jupiter)

5.630 M♃

Density

4.69 g/cm³

Surface Gravity

10.92 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.436

HZ Position Unknown

Controversial No

Discovery

Year 2015

Method Radial Velocity

Facility Bohyunsan Optical Astronomical Observatory

Telescope 1.8 m Telescope

Size rank in cohort

Rank by radius

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	HD 11755 b	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,789.38	317.83
Density (g/cm³)	5.51	4.69	1.33
Surface Gravity (g)	1.00	10.92	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	1,789.383 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 11755

HIP

HIP 9242

TIC

TIC 137121812

Gaia DR2

Gaia DR2 558504529130235136

Gaia DR3

Gaia DR3 558504529130235136

System

HD 11755

Percentile among Gas Giant cohort

Radius 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,789.383 M⊕ · percentile 78 / cohort 1747

Orbital period 433.70 d · percentile 65 / cohort 1533

Distance 235.05 pc · percentile 55 / cohort 1759

ESI 0.436 · percentile 96 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

433.700 days

Semi-major axis

1.0900 AU

Eccentricity

0.190

Inclination

— °

Year Length

A year here lasts about 1.19 Earth years on a mildly elliptical path at a mean orbital distance of 1.0900 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.436

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Lee et al. 2015

Instrument

BOES Echelle Spectrograph

Publication

2015-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2015 at Bohyunsan Optical Astronomical Observatory (3 shown).

HD 12648 b · Gas Giant 8 UMi b · Gas Giant HD 24064 b · Gas Giant

Host System: HD 11755

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

4,312 K — cooler than the Sun (5,778 K)

Estimated Age

10.20 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

20.580 R☉

Stellar Mass

0.720 M☉

Metallicity [Fe/H]

-0.74

Extended Stellar Properties

Surface gravity (log g)

1.670 dex

Systemic radial velocity

-86.72 km/s

Rotational v·sin i

2.30 km/s

Metallicity ratio

[Fe/H]

Distance

235.05 parsec

Light-years 766.61 ly

V-band magnitude

6.88 mag

Voyager-speed travel 13,519,226 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.226 mas

Total Proper Motion

81.468 mas/yr

PM Right Ascension

-57.78 mas/yr

PM Declination

-57.43 mas/yr

Galactic Cartesian (pc)

x = 0.252 · y = 0.144 · z = 0.957

Equatorial (J2000)

RA 29.70784° · Dec 73.15214°

Galactic ℓ, b

127.840° · 10.926°

Ecliptic λ, β

63.835° · 55.182°

HTM-20 index

-1824068761