Key parameters at a glance
- A radius of 2.33 Earth radii
- A mass of 6.04 Earth masses
- Surface gravity around 1.11 g
- An orbital period of 7.371 days
- Semi-major axis 0.0620 AU
- Distance from Earth 29.56 light-years
- Earth Similarity Index 0.730
- Travel time at Voyager 1 speed 521,372 years
- Almost certainly tidally locked to its host star given the close orbit
Context from the literature
Gliese 433 is a dim red dwarf star with multiple exoplanetary companions, located in the equatorial constellation of Hydra. The system is located at a distance of 29.6 light-years from the Sun based on parallax measurements, and it is receding with a radial velocity of +18 km/s. Based on its motion through space, this is an old disk star. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 9.81 and an absolute magnitude of 10.07.
Excerpted from Wikipedia · full article
2 siblings around GJ 433
GJ 433 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.
GJ 433 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1451of 1978
top 73.3%
This planet
2.33R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | GJ 433 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.33 | 11.21 |
| Mass (M⊕) | 1.00 | 6.04 | 317.83 |
| Density (g/cm³) | 5.51 | 2.63 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.11 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 6.043 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 Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.37 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0620 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.730
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Bonfils et al. 2013Instrument
HARPS Spectrograph
Publication
2013-01
Observation locale
Ground
Discovery cohort
Planets confirmed in 2011 at La Silla Observatory (10 shown).
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]
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
1
RV measurements
1
Stellar spectra
1
Similar Worlds
GJ 367 d
Sub-Neptune · M-type red dwarf
Radius 2.33 R⊕ · 30.7 ly
TOI-270 c
Sub-Neptune · M-type red dwarf
Radius 2.33 R⊕ · 73.3 ly
TOI-1243 b
Sub-Neptune · M-type red dwarf
Radius 2.33 R⊕ · 140.9 ly
TOI-4342 b
Sub-Neptune · M-type red dwarf
Radius 2.33 R⊕ · 200.7 ly
GJ 357 d
Sub-Neptune · M-type red dwarf
Radius 2.34 R⊕ · 30.8 ly
GJ 3998 d
Sub-Neptune · M-type red dwarf
Radius 2.34 R⊕ · 59.2 ly