Key parameters at a glance
- A radius of 14.10 Earth radii
- A mass of 209.77 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 2,671.000 days
- Semi-major axis 3.5300 AU
- Distance from Earth 10.45 light-years
- Earth Similarity Index 0.274
- Travel time at Voyager 1 speed 184,206 years
eps Eri b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#371of 1771
top 20.9%
This planet
14.10R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | eps Eri b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.10 | 11.21 |
| Mass (M⊕) | 1.00 | 209.77 | 317.83 |
| Density (g/cm³) | 5.51 | 0.41 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 209.767 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 186.000 M⊕ | Lower bound from radial-velocity fitting. |
| Computed mass | 494.000 M⊕ | Model-computed mass (e.g. from mass-radius relation). |
Star Catalogue Identifiers
HD
HD 22049
HIP
HIP 16537
TIC
TIC 118572803
Gaia DR2
Gaia DR2 5164707970261630080
Gaia DR3
Gaia DR3 5164707970261890560
System
eps Eri
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts about 7.31 Earth years on a nearly circular orbit at a mean orbital distance of 3.5300 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
10.340 m/s
Transit mid-time (BJD)
2,460,017.0000
Long. of periastron (ω)
-19.15°
Angular separation (arcsec)
1,100.00000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.274
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Hatzes et al. 2000Instrument
Multiple Instruments
Publication
2000-12
Observation locale
Ground
Discovery cohort
Planets confirmed in 2000 at Multiple Observatories (5 shown).
Host System: eps Eri
Spectral Class
K-type orange
Effective Temperature
5,020 K — cooler than the Sun (5,778 K)
Estimated Age
0.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.759 R☉
Stellar Mass
0.820 M☉
Metallicity [Fe/H]
-0.13
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
2.780 g/cm³
Systemic radial velocity
16.00 km/s
Rotational v·sin i
2.40 km/s
Rotation period
11.30 days
Activity index (log R'HK)
-4.510
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
312.219 mas
Total Proper Motion
975.587 mas/yr
PM Right Ascension
-975.38 mas/yr
PM Declination
20.27 mas/yr
Galactic Cartesian (pc)
x = 0.590 · y = 0.790 · z = -0.164
Equatorial (J2000)
RA 53.22843° · Dec -9.45817°
Galactic ℓ, b
195.841° · -48.055°
Ecliptic λ, β
48.159° · -27.715°
HTM-20 index
340435958
Observation Record
Photometric series
2
RV measurements
6
Archive notes
3
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