eps Eri

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
eps Eri
eps Eri b	2671 d	209.77 M_⨁	Radial Velocity	2000	Hatzes et al. 2000	Confirmed Planet

Exoplanet Archive Notes (3)

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eps Eri

Some stellar parameter values may be biased due to companion blend (WDS Catalog)
Stellar mass selected from evolutionary track mass (M_track) in Table 4 (Ghezzi et al. 2010)

eps Eri b

Planet parameters drawn from 800 Myr model in Table 4 (Mawet et al. 2019)

eps Eri Stellar Parameters (39 Solutions)

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RA: 03h32m54.82s

Dec: -09d27m29.42s

Distance: 3.20260±0.00483 pc

Parallax: 312.219000±0.467348 mas

Ecliptic Latitude: -27.71455 deg

Ecliptic Longitude: 48.15936 deg

Galactic Latitude: -48.05487 deg

Galactic Longitude: 195.84135 deg

Total Proper Motion: 975.5865066±0.5673523 mas/yr

Proper Motion (RA): -975.376000±0.567357 mas/yr

Proper Motion (Dec): 20.265500±0.556325 mas/yr

Photometry: m_V
3.71548±0.02300; m_TESS
2.9054±1.7796; m_J
2.228±0.298; m_H
1.880±0.276; m_Ks
1.776±0.286; m_W1
>-0.792; m_W2
>-0.146; m_W3
1.748±0.025; m_W4
1.406±0.014; m_Ic
2.785; m_Gaia
3.4771900±0.0055451; m_B
4.616±0.018

Abundances (Hypatia Catalog): [Fe/H] -0.05±0.46 dex; [C/H] 0.06±0.35 dex; [O/H] -0.07±0.16 dex; [Na/H] -0.13±0.45 dex; [Mg/H] -0.02±0.96 dex; [Al/H] -0.07±0.23 dex; [Si/H] -0.08±0.25 dex; [Ca/H] -0.01±0.67 dex; [Y/H] -0.02±0.14 dex; [BaII/H] 0.07±0.18 dex

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; Stellar Hosts

Source	Harada et al. 2025	Llop-Sayson et al. 2021	Rosenthal et al. 2021	TICv8	Mawet et al. 2019	Gaia DR2	Turnbull 2015	Maldonado et al. 2015	Sanz-Forcada et al. 2010	Sousa et al. 2008	Takeda et al. 2007	Benedict et al. 2006	Gray et al. 2006	Valenti & Fischer 2005	Wright et al. 2004	Nordstrom et al. 2004	Gray et al. 2003	Pizzolato et al. 2003	Nidever et al. 2002	Hatzes et al. 2000	Michigan Catalog, Vol. 5	Henry et al. 1996	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Duncan et al. 1991	Cannon & Pickering 1918
S Index	---	---	---	---	---	---	---	---	---	---	---	---	---	---	0.447±0.058	---	---	---	---	---	---	0.490±0.021	0.4938±0.0194	0.4920±0.0536	0.5001±0.0212	0.5098±0.0194	0.5328±0.0196	0.4928±0.0162	0.4595±0.0111	0.5300±0.0185	0.5467±0.0174	0.5309±0.0248	0.4938±0.0194	0.4920±0.0536	0.5001±0.0212	0.5098±0.0194	0.5328±0.0196	0.4928±0.0162	---
CAII LOG RHK	---	---	---	---	---	---	---	---	---	---	---	---	---	---	-4.51	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
T_eff (K)	5098	---	5020.3760341750003±57.6873540161000	5065.0000+131.1390-71.5572	---	4975.000+520.667-288.667	5146	5136±18	---	5153±42	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
L_✶ (log₁₀(L_⦿))	---	---	---	-0.4706705+0.0113977-0.0087912	---	-0.41928208+0.00174942-0.00175652	-0.456 +0.069-0.082	---	---	-0.485+0.003-0.003	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
Metallicity (dex)	---	---	-0.043887015946950006±0.058290869190199997 [Fe/H]	-0.050±0.100 [M/H]	---	---	-0.03 [Fe/H]	-0.03±0.02 [Fe/H]	---	-0.11±0.03 [Fe/H]	---	-0.13±0.04 [Fe/H]	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
Age (Gyr)	---	0.600±0.200	---	---	0.5±0.3	---	2.6	---	1.12	---	<0.60	0.8	---	---	---	---	---	---	---	<1	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
M_✶ (M_⦿)	---	0.82±0.02	0.814595451310500±0.024151859262575	0.8500000+0.1199210-0.0799538	0.781±0.005	---	0.86	---	---	0.855	0.856+0.006-0.008	0.83±0.05	---	---	---	---	---	---	---	0.85	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
R_✶ (R_⦿)	---	---	0.75910566974500004±0.01181633622092500	0.7553680+0.0285487-0.0480794	---	0.8306641+0.1054850-0.1499400	0.77	---	---	---	0.77+0.02-0.01	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
log g (log₁₀(cm/s²))	---	---	4.5900996225549999±0.0182402917122250	4.6111700+0.0634557-0.0883423	---	---	4.61	4.71±0.05	---	4.53±0.07	4.61	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
Sp. T	---	K2 V	---	---	---	---	K2.0V	---	---	---	---	---	K2 V (k)	---	---	---	K2 V (k)	---	---	---	K2 V	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	K0
γ (km/s)	---	---	---	---	---	---	---	---	---	---	---	---	---	17.3	---	16.0±0.1	---	---	16.3	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
v sin i (km/s)	---	---	---	---	---	---	---	---	---	---	---	---	---	2.4±0.5	---	3	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
P_rot (days)	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	11.30	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---
ρ_✶ (g/cm³)	---	---	---	2.7804171+0.5076418-0.6691106	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---

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eps Eri b Planetary Parameters (6 Solutions)

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Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Llop-Sayson et al. 2021	Harada et al. 2025	Rosenthal et al. 2021	Mawet et al. 2019	Benedict et al. 2006	Hatzes et al. 2000
T_p (days)	2460054+680-690 (JD)	---	---	2447198+361-426 (JD)	2454207.5±7.0	2449194.8±13.5 (JD)
ω (deg)	-19.150+88.270-94.800	117+32-37	-10+69-49	175+53-52	47±3	48.9±4.1
M_p (M_⨁)	210+38-29	---	---	248+121-38	493±76	540
M_p (M_Jup)	0.66+0.12-0.09	---	---	0.780+0.380-0.120	1.55±0.24	1.7
M_p sin i (M_⨁)	---	186.0±12.0	207+12-12	---	248±25	273
M_p sin i (M_Jup)	---	0.5852±0.0378	0.651+0.038-0.039	---	0.78±0.08	0.86
e	0.070+0.070-0.050	0.0880±0.0480	0.044+0.047-0.031	0.070+0.060-0.050	0.702±0.039	0.608±0.041
i (deg)	78.810+29.340-22.410	---	---	89.0±42.0	30.1±3.8	30
P (days)	2671+17-23	2686.0+19.0-18.0	2650±21	2690±30	2502±10	2502.1±20.1
K (m/s)	10.34+0.95-0.93	10.73±0.54	11.00+0.59-0.61	---	18.5±0.2	19.0±1.7
a (au)	3.53+0.03-0.04	3.390+0.064-0.066	3.500±0.039	---	3.39±0.36	3.4
T_C (days)	2460017+76-32 (JD)	2457405.0+44.0-40.0 (JD)	2457388+45-36 (BJD)	---	---	---

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Ancillary Information (8 Unique Files)

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+ eps Eri (2 File Types, 8 Files)

Literature Time Series (2 File Types, 8 Files)

File Type	Data Points	Filter	Reference
Photometric Light Curve	492	Optical (MOST)	Croll et al. 2006
Photometric Light Curve	75	Hp (Hipparcos)	Hipparcos and Tycho Catalogs
Radial Velocity Curve	127	Optical Spectra	Howard & Fulton 2016
Radial Velocity Curve	61	Optical Spectra	Howard & Fulton 2016
Radial Velocity Curve	49	Optical Spectra	Howard & Fulton 2016
Radial Velocity Curve	33	Optical Spectra	Benedict et al. 2006
Radial Velocity Curve	120	Optical Spectra	Butler et al. 2006
Radial Velocity Curve	33	Optical Spectra	Campbell et al. 1988

Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 1 Confirmed Planets; 1 2MASS Point Source Catalog

Data Files: 1 Associated Literature Data

Bibliography (38 References)

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SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring
Harada et al. 2025 Reference Overview
Constraining the Orbit and Mass of epsilon Eridani b with Radial Velocities, Hipparcos IAD-Gaia DR2 Astrometry, and Multiepoch Vortex Coronagraphy Upper Limits
Llop-Sayson et al. 2021 Reference Overview
The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades
Rosenthal et al. 2021 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Deep Exploration of ∊ Eridani with Keck Ms-band Vortex Coronagraphy and Radial Velocities: Mass and Orbital Parameters of the Giant Exoplanet
Mawet et al. 2019 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
Limits on Planetary Companions from Doppler Surveys of Nearby Stars
Howard & Fulton 2016 Reference Overview
ExoCat-1: The Nearby Stellar Systems Catalog for Exoplanet Imaging Missions
Turnbull 2015 Reference Overview
Searching for signatures of planet formation in stars with circumstellar debris discs
Maldonado et al. 2015 Reference Overview
All WISE Data Release
Cutri et al. 2014 Reference Overview
Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity
Ghezzi et al. 2010 Reference Overview
A scenario of planet erosion by coronal radiation
Sanz-Forcada et al. 2010 Reference Overview
Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes
Sousa et al. 2008 Reference Overview
Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
Takeda et al. 2007 Reference Overview
The Extrasolar Planet eta Eridani b: Orbit and Mass
Benedict et al. 2006 Reference Overview
Differential Rotation of epsilon Eridani Detected by MOST
Croll et al. 2006 Reference Overview
Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
Gray et al. 2006 Reference Overview
Catalog of Nearby Exoplanets
Butler et al. 2006 Reference Overview
Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs
Valenti & Fischer 2005 Reference Overview
Chromospheric Ca II Emission in Nearby F, G, K, and M Stars
Wright et al. 2004 Reference Overview
The Geneva-Copenhagen survey of the Solar neighbourhood. Ages,metallicities and kinematix properties of ~14 000 F and G dwarfs
Nordstrom et al. 2004 Reference Overview
Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I
Gray et al. 2003 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview
The stellar activity-rotation relationship revisited: Dependence of saturated and non-saturated X-ray emission regimes on stellar mass for late-type dwarfs.
Pizzolato et al. 2003 Reference Overview
Radial Velocities of 889 late-type stars
Nidever et al. 2002 Reference Overview
Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog
Bakos et al. 2002 Reference Overview
Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
van Altena et al. 2001 Reference Overview
Evidence for a Long-Period Planet Orbiting eta Eridani
Hatzes et al. 2000 Reference Overview
The Tycho-2 catalog of the 2.5 million brightest stars
The Tycho-2 Catalog Reference Overview
Michigan Catalog of two-dimensional spectral types for the HD stars, Vol 5
Michigan Catalog, Vol. 5 Reference Overview
The Washington Double Star Catalog (WDS, 1996.0)
WDS Catalog Reference Overview
The Hipparcos and Tycho Catalogs
Hipparcos and Tycho Catalogs Reference Overview
A Survey of Ca II H and K Chromospheric Emission in Southern Solar-Type Stars
Henry et al. 1996 Reference Overview
CA II H and K measurements made at Mount Wilson Observatory, 1966-1983
Duncan et al. 1991 Reference Overview
A search for substellar companions to solar-type stars
Campbell et al. 1988 Reference Overview
VRI photometry of nearby stars.
Cousins 1980a Reference Overview
UBVRIJKL Photometry of Bright Stars
Johnson et al. 1966 Reference Overview
The Henry Draper catalogue 0h, 1h, 2h, and 3h
Cannon & Pickering 1918 Reference Overview

Legend

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System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
Search
Browse
Download

Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/4/eps_Eri.json

Catalog Parameters

RA

ra

03h32m54.82s

Dec

dec

-09d27m29.42s

β

elat

-27.71455

λ

elon

48.15936

b

glat

-48.05487

l

glon

195.84135

m_V

sy_vmag

3.71548±0.02300

m_TESS

sy_tmag

2.9054±1.7796

m_J

sy_jmag

2.228±0.298

m_H

sy_hmag

1.880±0.276

m_Ks

sy_kmag

1.776±0.286

sy_kepmag

no_data

m_W1

sy_w1mag

>-0.792

m_W2

sy_w2mag

>-0.146

m_W3

sy_w3mag

1.748±0.025

m_W4

sy_w4mag

1.406±0.014

m_Ic

sy_icmag

2.785

m_Gaia

sy_gaiamag

3.4771900±0.0055451

m_B

sy_bmag

4.616±0.018

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

975.5865066±0.5673523

μ_δ

sy_pmdec

20.265500±0.556325

μ_α

sy_pmra

-975.376000±0.567357

π

sy_plx

312.219000±0.467348

Distance

sy_dist

3.20260±0.00483

Set Parameters

R_✶

st_rad

0.77

T_eff

st_teff

5146

eps Eri Overview

eps Eri Architecture & Discovery Information

eps Eri