Key parameters at a glance
- A radius of 8.40 Earth radii
- A mass of 53.83 Earth masses
- Surface gravity around 0.76 g
- An orbital period of 749.830 days
- Semi-major axis 1.4000 AU
- Equilibrium temperature 125 K (-148 °C)
- Distance from Earth 38.78 light-years
- Earth Similarity Index 0.222
- Travel time at Voyager 1 speed 683,844 years
1 sibling around GJ 414 A
GJ 414 A 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 |
|---|---|---|---|---|---|---|
| GJ 414 A b | Sub-Neptune | 2.63 | 7.60 | 50.800 | 309 | 2021 |
| GJ 414 A c this | Neptune-like | 8.40 | 53.83 | 749.830 | 125 | 2021 |
GJ 414 A c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#129of 574
top 22.3%
This planet
8.40R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | GJ 414 A c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.40 | 11.21 |
| Mass (M⊕) | 1.00 | 53.83 | 317.83 |
| Density (g/cm³) | 5.51 | 0.50 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.76 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 53.830 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 97101
HIP
HIP 54646
TIC
TIC 9001920
Gaia DR2
Gaia DR2 732857558276385664
Gaia DR3
Gaia DR3 732857558276385664
System
GJ 414
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 2.05 Earth years on a mildly elliptical path at a mean orbital distance of 1.4000 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
5.140 m/s
Transit mid-time (BJD)
2,457,228.0000
Long. of periastron (ω)
74.00°
Angular separation (arcsec)
118.00000
Eq. Temperature
125K
(-148 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.222
0 = alien, 1 = Earth-identical
Insufficient insolation data — any water would exist as deep ice.
Discovery Paper
Primary reference
Dedrick et al. 2021Instrument
HIRES Spectrometer
Publication
2021-02
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at W. M. Keck Observatory (2 shown).
Host System: GJ 414 A
Spectral Class
K-type orange
Effective Temperature
4,120 K — cooler than the Sun (5,778 K)
Estimated Age
12.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.680 R☉
Stellar Mass
0.650 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.650 dex
Stellar density
2.152 g/cm³
Systemic radial velocity
-17.20 km/s
Rotational v·sin i
3.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
84.080 mas
Total Proper Motion
623.637 mas/yr
PM Right Ascension
591.62 mas/yr
PM Declination
-197.25 mas/yr
Galactic Cartesian (pc)
x = -0.843 · y = 0.183 · z = 0.507
Equatorial (J2000)
RA 167.77450° · Dec 30.44517°
Galactic ℓ, b
198.372° · 67.813°
Ecliptic λ, β
156.342° · 23.097°
HTM-20 index
1976359464
Observation Record
Photometric series
1
Stellar spectra
2
Archive notes
3
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