HD 66428

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
HD 66428
HD 66428 b	2269.82 d	3478.95 M_⨁	Radial Velocity	2005	Butler et al. 2006	Confirmed Planet
HD 66428 c	10478.84 d	560.65 M_⨁	Radial Velocity	2021	Rosenthal et al. 2021	Confirmed Planet

Exoplanet Archive Notes (1)

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HD 66428

Stellar mass selected from evolutionary track mass (M_track) in Table 4 (Ghezzi et al. 2010)

HD 66428 Stellar Parameters (19 Solutions)

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RA: 08h03m28.60s

Dec: -01d09m48.97s

Distance: 53.2817+0.2180-0.2162
pc

Parallax: 18.7398000±0.0758976 mas

Ecliptic Latitude: -21.09955 deg

Ecliptic Longitude: 123.35194 deg

Galactic Latitude: 15.41735 deg

Galactic Longitude: 222.42686 deg

Total Proper Motion: 217.1239644±0.0685527 mas/yr

Proper Motion (RA): -65.725900±0.104314 mas/yr

Proper Motion (Dec): -206.9370000±0.0638424 mas/yr

Photometry: m_V
8.25±0.03; m_TESS
7.6306±0.0060; m_J
7.044±0.023; m_H
6.768±0.061; m_Ks
6.660±0.021; m_W1
6.634±0.073; m_W2
6.641±0.022; m_W3
6.677±0.017; m_W4
6.629±0.081; m_Gaia
8.081420±0.000245; m_B
8.967±0.027

Abundances (Hypatia Catalog): [Fe/H] 0.29±0.09 dex; [C/H] 0.33±0.13 dex; [O/H] 0.19±0.16 dex; [Na/H] 0.42±0.11 dex; [Mg/H] 0.35±0.20 dex; [Al/H] 0.32±0.09 dex; [Si/H] 0.30±0.12 dex; [Ca/H] 0.27±0.06 dex; [Y/H] 0.26±0.12 dex; [BaII/H] 0.20±0.04 dex

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

Source	An et al. 2025	Feng et al. 2022	Rosenthal et al. 2021	TICv8	Gaia DR2	Barbato et al. 2018	Stassun et al. 2017	Bryan et al. 2016	Ghezzi et al. 2010	Sousa et al. 2008	Takeda et al. 2007	Butler et al. 2006	Valenti & Fischer 2005	Wright et al. 2004	Nordstrom et al. 2004	Nidever et al. 2002	Michigan Catalog, Vol. 5	Michigan Catalog, Vol. 5	Cannon & Pickering 1918
S Index	---	---	---	---	---	---	---	---	---	---	---	---	---	0.149±0.019	---	---	---	---	---
CAII LOG RHK	---	---	---	---	---	---	---	---	---	---	---	---	---	-5.08	---	---	---	---	---
T_eff (K)	---	---	5647.601181360000±94.325792356200	5669.000+171.276-112.098	5689.0000+31.9500-35.3335	5773±23	5716±20	---	5615±55	5705±27	---	5752	---	---	---	---	---	---	---
Metallicity (dex)	---	---	0.2713855248210000±0.0614681627528000 [Fe/H]	0.24±0.10 [M/H]	---	0.23±0.05 [Fe/H]	0.27 [Fe/H]	---	0.23±0.05 [Fe/H]	0.25±0.02 [Fe/H]	---	0.310 [Fe/H]	---	---	---	---	---	---	---
M_✶ (M_⦿)	1.145+0.056-0.057	1.010±0.132	1.050574746980±0.044737755861	1.010000+0.163948-0.100855	---	1.083±0.022	1.00±0.07	1.061+0.070-0.056	1.00±0.10	1.011	1.061+0.070-0.056	1.10	---	---	---	---	---	---	---
log g (log₁₀(cm/s²))	---	---	4.32294252178000±0.03055980807385	4.3153200+0.0804528-0.0887197	---	4.360±0.050	4.33±0.03	---	4.06±0.10	4.31±0.06	4.43±0.05	4.490	---	---	---	---	---	---	---
R_✶ (R_⦿)	---	---	1.1691188789400000±0.0273867414809000	1.1575300+0.0659156-0.0638834	1.1501205+0.0144206-0.0128105	1.102±0.062	1.13±0.02	---	1.15±0.12	---	1.05+0.06-0.05	---	---	---	---	---	---	---	---
L_✶ (log₁₀(L_⦿))	---	---	---	0.095788085+0.013688676-0.008074904	0.096325128+0.002203901-0.002215142	---	---	---	0.0710±0.0880	0.1086+0.0195-0.0204	---	---	---	---	---	---	---	---	---
γ (km/s)	---	---	---	---	43.989275006215379±0.186130308036394	---	---	---	---	---	---	---	43.9	---	44.3±0.4	44.1	---	---	---
Age (Gyr)	---	---	---	---	---	3.515±2.040	---	---	8.00+2.50-3.00	---	5.56+1.88-3.20	---	---	---	---	---	---	---	---
P_rot (days)	---	---	---	---	---	38	---	---	---	---	---	---	---	---	---	---	---	---	---
v sin i (km/s)	---	---	---	---	---	---	---	---	---	---	---	---	0.0±0.5	---	1	---	---	---	---
Sp. T	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---	G8 IV (+ G)	G8 IV (+ G)	G5
ρ_✶ (g/cm³)	---	---	---	0.91809020+0.21228880-0.22059690	---	---	---	---	---	---	---	---	---	---	---	---	---	---	---

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HD 66428 b Planetary Parameters (8 Solutions)

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Status: Confirmed Planet

Detected By: Astrometry, Radial Velocity

Tools: Planetary Systems

Source	Feng et al. 2022	An et al. 2025	Rosenthal et al. 2021	Barbato et al. 2018	Stassun et al. 2017	Bryan et al. 2016	Feng et al. 2015	Butler et al. 2006
T_p (days)	2450057.763+16.562-18.431 (BJD)	---	---	2456857.2+7.3-7.4 (BJD)	---	2452277±20 (JD)	2452278±16	2452139±16
ω (deg)	185.689+1.688-1.596	---	5.5+3.1-2.6	187.030+1.926-2.070	---	179.7±3.1	180.4±2.6	152.9±3.9
M_p sin i (M_⨁)	---	1071±41	1014±35	1018±14	839±64	982±22	1015.106±19.069	896.2±85.8
M_p sin i (M_Jup)	---	3.37±0.13	3.19±0.11	3.204±0.043	2.64±0.20	3.09±0.07	3.194±0.060	2.82±0.27
e	0.471±0.012	0.418+0.014-0.013	0.418+0.015-0.014	0.493±0.015	0.47±0.03	0.448+0.016-0.015	0.440±0.013	0.465±0.030
P (days)	2269.81726+5.36611-5.85401	2286±5	2288.9+6.2-6.8	2263.12+6.13-5.94	1973.00000±31.00000	2280.4±6.6	2293.9±6.4	1973±31
K (m/s)	54.441+1.035-1.167	---	52.5±1.1	54.03+1.46-1.43	48.3±2.7	51.4+1.5-1.4	52.6±1.1	48.3±2.7
a (au)	3.395+0.141-0.157	3.558+0.058-0.060	3.455+0.049-0.050	3.467±0.024	3.14±0.07	---	3.471±0.069	3.18±0.19
T_C (days)	---	---	2456562±13 (BJD)	---	---	---	---	---
M_p (M_⨁)	3478.9+776.1-1222.1	---	---	---	---	---	---	---
M_p (M_Jup)	10.946+2.442-3.845	---	---	---	---	---	---	---
i (deg)	16.639+10.121-2.959	90.0+47.0-45.0	---	---	---	---	---	---

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HD 66428 c Planetary Parameters (3 Solutions)

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Status: Confirmed Planet

Detected By: Astrometry, Radial Velocity

Tools: Planetary Systems

Source	Feng et al. 2022	An et al. 2025	Rosenthal et al. 2021
ω (deg)	201.295+34.739-33.249	---	30.9397320+37.2422700-80.2141200
M_p sin i (M_⨁)	---	---	8581+6992-5403
M_p sin i (M_Jup)	---	---	27+22-17
e	0.207+0.097-0.098	0.24+0.17-0.10	0.32+0.23-0.16
P (days)	10478.84437+3362.50248-1953.18727	26000+25202-10592	39000+56000-18000
K (m/s)	16.570+2.866-1.732	---	150+120-85
a (au)	9.4080+1.9450-1.2670	18.0+10.0-5.4	23.0+19.0-7.6
T_C (days)	---	---	2445900+4600-4500 (BJD)
T_p (days)	2446117.610+2786.723-3631.423 (BJD)	---	---
M_p (M_⨁)	560.6+1081.9-13.0	6865+4322-2606	---
M_p (M_Jup)	1.764+3.404-0.041	21.6+13.6-8.2	---
i (deg)	93.9380+57.0030-55.4760	120+33-57	---

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Ancillary Information (2 Unique Files)

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+ HD 66428 (2 File Types, 2 Files)

Literature Time Series (2 File Types, 2 Files)

File Type	Data Points	Filter	Reference
Photometric Light Curve	89	Hp (Hipparcos)	Hipparcos and Tycho Catalogs
Radial Velocity Curve	29	Optical Spectra	Butler et al. 2006

Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 2 Confirmed Planets; 3 2MASS Point Source Catalog

Data Files: 2 Associated Literature Data

Bibliography (24 References)

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Orbits and Masses for 156 Companions from Combined Astrometry and Radial Velocities, and a Validation of Gaia Non-single-star Solutions
An et al. 2025 Reference Overview
3D Selection of 167 Substellar Companions to Nearby Stars
Feng et al. 2022 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
Gaia Data Release 2
Gaia DR2 Reference Overview
Exploring the realm of scaled solar system analogues with HARPS
Barbato et al. 2018 Reference Overview
Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes
Stassun et al. 2017 Reference Overview
Statistics of Long Period Gas Giant Planets in Known Planetary Systems
Bryan et al. 2016 Reference Overview
The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets
Feng 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
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
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
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview
Radial Velocities of 889 late-type stars
Nidever et al. 2002 Reference Overview
The Hipparcos and Tycho Photometric System Passbands
Tycho 2 converted using Bessell 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 Hipparcos and Tycho Catalogs
Hipparcos and Tycho Catalogs 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
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Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/4/HD_66428.json

Catalog Parameters

RA

ra

08h03m28.60s

Dec

dec

-01d09m48.97s

β

elat

-21.09955

λ

elon

123.35194

b

glat

15.41735

l

glon

222.42686

m_V

sy_vmag

8.25±0.03

m_TESS

sy_tmag

7.6306±0.0060

m_J

sy_jmag

7.044±0.023

m_H

sy_hmag

6.768±0.061

m_Ks

sy_kmag

6.660±0.021

sy_kepmag

no_data

m_W1

sy_w1mag

6.634±0.073

m_W2

sy_w2mag

6.641±0.022

m_W3

sy_w3mag

6.677±0.017

m_W4

sy_w4mag

6.629±0.081

sy_icmag

no_data

m_Gaia

sy_gaiamag

8.081420±0.000245

m_B

sy_bmag

8.967±0.027

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

217.1239644±0.0685527

μ_δ

sy_pmdec

-206.9370000±0.0638424

μ_α

sy_pmra

-65.725900±0.104314

π

sy_plx

18.7398000±0.0758976

Distance

sy_dist

53.2817+0.2180-0.2162

Set Parameters

R_✶

st_rad

1.13±0.02

T_eff

st_teff

5752

HD 66428 Overview

HD 66428 Architecture & Discovery Information

HD 66428