Key parameters at a glance

A radius of 6.27 Earth radii
A mass of 32.42 Earth masses
Surface gravity around 0.82 g
An orbital period of 5,094.105 days
Semi-major axis 4.8190 AU
Distance from Earth 29.56 light-years
Earth Similarity Index 0.414
Travel time at Voyager 1 speed 521,372 years

2 siblings around GJ 433

GJ 433 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
GJ 433 b	Sub-Neptune	2.33	6.04	7.371	—	2011
GJ 433 d	Sub-Neptune	2.14	5.22	36.059	—	2020
GJ 433 c this	Neptune-like	6.27	32.42	5,094.105	—	2014

GJ 433 c Planet Profile

Physical Specs

Radius

6.27 R⊕

Radius (Jupiter)

0.560 R♃

Mass

32.42 M⊕

Mass (Jupiter)

0.102 M♃

Density

0.72 g/cm³

Surface Gravity

0.82 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.414

HZ Position Unknown

Controversial No

Discovery

Year 2014

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#257of 574

top 44.6%

This planet

6.27R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

K2-39 b 6.28 R⊕ Kepler-1004 b 6.28 R⊕ TOI-5005 b 6.25 R⊕

Metric	Earth	GJ 433 c	Jupiter
Radius (R⊕)	1.00	6.27	11.21
Mass (M⊕)	1.00	32.42	317.83
Density (g/cm³)	5.51	0.72	1.33
Surface Gravity (g)	1.00	0.82	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	32.422 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 56528

TIC

TIC 57654763

Gaia DR2

Gaia DR2 3478160727866058368

Gaia DR3

Gaia DR3 3478160727866058368

System

GJ 433

Percentile among Neptune-like cohort

Radius 6.270 R⊕ · percentile 55 / cohort 574

Mass 32.422 M⊕ · percentile 54 / cohort 574

Orbital period 5,094.11 d · percentile 100 / cohort 524

Distance 9.06 pc · percentile 2 / cohort 572

ESI 0.414 · percentile 75 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

5,094.105 days

Semi-major axis

4.8190 AU

Eccentricity

0.120

Inclination

— °

Year Length

A year here lasts about 13.95 Earth years on a mildly elliptical path at a mean orbital distance of 4.8190 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.414

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Tuomi et al. 2014

Instrument

Multiple Instruments

Publication

2014-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2014 at Multiple Observatories (12 shown).

GJ 682 b · Super-Earth GJ 180 c · Sub-Neptune GJ 180 b · Sub-Neptune GJ 682 c · Sub-Neptune GJ 160.2 b · Sub-Neptune GJ 422 b · Sub-Neptune GJ 27.1 b · Sub-Neptune HIP 105854 b · Gas Giant TYC 1422-614-1 c · Gas Giant TYC 1422-614-1 b · Gas Giant HD 141399 c · Gas Giant HD 141399 d · Gas Giant

Host System: GJ 433

Spectral Class

M-type red dwarf

Effective Temperature

3,461 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.500 R☉

Stellar Mass

0.480 M☉

Metallicity [Fe/H]

-0.17

Extended Stellar Properties

Surface gravity (log g)

4.810 dex

Stellar density

6.367 g/cm³

Systemic radial velocity

17.53 km/s

Metallicity ratio

[Fe/H]

Distance

9.06 parsec

Light-years 29.56 ly

V-band magnitude

9.81 mag

Voyager-speed travel 521,372 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

110.291 mas

Total Proper Motion

853.618 mas/yr

PM Right Ascension

-70.77 mas/yr

PM Declination

-850.68 mas/yr

Galactic Cartesian (pc)

x = -0.838 · y = 0.090 · z = -0.538

Equatorial (J2000)

RA 173.86192° · Dec -32.54363°

Galactic ℓ, b

284.885° · 27.651°

Ecliptic λ, β

188.898° · -31.965°

HTM-20 index

-971693997

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes