Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 3,135.70 Earth masses
Surface gravity around 20.07 g
An orbital period of 36,336.707 days
Semi-major axis 22.2100 AU
Distance from Earth 103.60 light-years
Earth Similarity Index 0.385
Travel time at Voyager 1 speed 1,826,915 years

1 sibling around HD 12235

HD 12235 c 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 12235 b	Sub-Neptune	3.23	10.49	4.363	—	2022
HD 12235 c this	Gas Giant	12.50	3,135.70	36,336.707	—	2022

HD 12235 c Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,135.70 M⊕

Mass (Jupiter)

9.866 M♃

Density

8.82 g/cm³

Surface Gravity

20.07 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.385

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	HD 12235 c	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	3,135.70	317.83
Density (g/cm³)	5.51	8.82	1.33
Surface Gravity (g)	1.00	20.07	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,135.695 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 12235

TIC

TIC 422679659

Gaia DR2

Gaia DR2 2511794495013074048

Gaia DR3

Gaia DR3 2511794495013074048

System

HD 12235

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 3,135.695 M⊕ · percentile 87 / cohort 1747

Orbital period 36,336.71 d · percentile 99 / cohort 1533

Distance 31.76 pc · percentile 8 / cohort 1759

ESI 0.385 · percentile 81 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

36,336.707 days

Semi-major axis

22.2100 AU

Eccentricity

0.174

Inclination

47.74 °

Year Length

A year here lasts about 99.48 Earth years on a mildly elliptical path at a mean orbital distance of 22.2100 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.385

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2022

Instrument

Multiple Instruments

Publication

2022-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at Multiple Observatories (12 shown).

Kepler-138 e · Rocky Terrestrial HD 93351 b · Super-Earth GJ 1002 b · Rocky Terrestrial GJ 2030 b · Sub-Neptune GJ 3929 c · Sub-Neptune HD 217786 c · Sub-Neptune GJ 1002 c · Rocky Terrestrial HD 155918 b · Sub-Neptune HD 213519 b · Sub-Neptune HD 191939 g · Sub-Neptune GJ 514 b · Sub-Neptune HD 12235 b · Sub-Neptune

Host System: HD 12235

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,986 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.802 R☉

Stellar Mass

1.100 M☉

Metallicity [Fe/H]

0.31

Extended Stellar Properties

Surface gravity (log g)

3.968 dex

Stellar density

0.265 g/cm³

Metallicity ratio

[M/H]

Distance

31.76 parsec

Light-years 103.60 ly

V-band magnitude

5.88 mag

Voyager-speed travel 1,826,915 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

31.455 mas

Total Proper Motion

345.212 mas/yr

PM Right Ascension

230.91 mas/yr

PM Declination

-256.62 mas/yr

Galactic Cartesian (pc)

x = 0.864 · y = 0.500 · z = 0.054

Equatorial (J2000)

RA 30.03916° · Dec 3.09591°

Galactic ℓ, b

154.338° · -55.529°

Ecliptic λ, β

29.044° · -8.585°

HTM-20 index

1879477160