HD 12661

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
HD 12661
HD 12661 b	262.71 d	> 772.33 M_⨁	Radial Velocity	2000	Fischer et al. 2001	Confirmed Planet
HD 12661 c	1708 d	> 575.88 M_⨁	Radial Velocity	2002	Fischer et al. 2003	Confirmed Planet

Exoplanet Archive Notes (1)

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HD 12661

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

HD 12661 Stellar Parameters (15 Solutions)

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RA: 02h04m34.16s

Dec: +25d24m48.83s

Distance: 37.8478+0.0633-0.0630
pc

Parallax: 26.3927000±0.0437412 mas

Ecliptic Latitude: 12.00084 deg

Ecliptic Longitude: 37.77908 deg

Galactic Latitude: -34.58321 deg

Galactic Longitude: 143.06278 deg

Total Proper Motion: 204.3236427±0.0890284 mas/yr

Proper Motion (RA): -108.181000±0.089332 mas/yr

Proper Motion (Dec): -173.3350000±0.0889099 mas/yr

Photometry: m_V
7.43±0.03; m_TESS
6.7944±0.0060; m_J
6.182±0.019; m_H
5.896±0.021; m_Ks
5.861±0.024; m_W1
5.794±0.139; m_W2
5.732±0.049; m_W3
5.846±0.015; m_W4
5.783±0.044; m_Gaia
7.24746±0.00037; m_B
8.156±0.023

Abundances (Hypatia Catalog): [Fe/H] 0.39±0.14 dex; [C/H] 0.33±0.33 dex; [O/H] 0.22±0.15 dex; [Na/H] 0.42±0.17 dex; [Mg/H] 0.44±0.22 dex; [Al/H] 0.42±0.14 dex; [Si/H] 0.36±0.11 dex; [Ca/H] 0.30±0.13 dex; [Y/H] 0.33±0.09 dex; [BaII/H] 0.21±0.12 dex

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

Source	An et al. 2025	An et al. 2025	Rosenthal et al. 2021	TICv8	Gaia DR2	Stassun et al. 2017	Liu et al. 2014	Ghezzi et al. 2010	Valenti & Fischer 2005	Wright et al. 2004	Santos et al. 2004	Santos et al. 2003	Nidever et al. 2002	Fischer et al. 2001	Cannon & Pickering 1918
S Index	---	---	---	---	---	---	---	---	---	0.150±0.019	---	---	---	---	---
CAII LOG RHK	---	---	---	---	---	---	---	---	---	-5.08	---	---	---	---	---
T_eff (K)	---	---	5661.17857861000±94.13539023677	5655.000+104.729-104.017	5656.00+78.25-35.00	5645±31	5748±70	5785±50	---	---	5702±36	5715	---	5754	---
Metallicity (dex)	---	---	0.33827528360750003±0.05896265415172500 [Fe/H]	0.3±0.1 [M/H]	---	0.36 [Fe/H]	0.36±0.03 [Fe/H]	0.37±0.03 [Fe/H]	---	---	0.36±0.05 [Fe/H]	0.36 [Fe/H]	---	0.29±0.05 [Fe/H]	---
M_✶ (M_⦿)	1.158+0.058-0.056	1.158+0.054-0.055	1.08482566338500±0.04381502270397	1.000000+0.134603-0.117835	---	1.20±0.10	1.02±0.02	1.10±0.10	---	---	1.05	1.05	---	1.07	---
R_✶ (R_⦿)	---	---	1.19817158325500±0.02673242219787	1.2137700+0.0716030-0.0313769	1.2145214+0.0151719-0.0329207	1.20±0.02	1.11±0.08	1.04±0.08	---	---	---	---	---	1.096	---
log g (log₁₀(cm/s²))	---	---	4.3161284158550002±0.0287057483393500	4.2698000+0.0539079-0.0875185	---	4.36±0.03	---	4.39±0.15	---	---	4.33±0.08	4.49	---	4.43	---
L_✶ (log₁₀(L_⦿))	---	---	---	0.13269729+0.00991431-0.01048918	0.13354264+0.00103477-0.00103724	---	0.063±0.063	0.033±0.063	---	---	---	---	---	---	---
Age (Gyr)	---	---	---	---	---	---	6.39±1.94	<1.0+2.5-1.0	---	---	---	---	---	---	---
γ (km/s)	---	---	---	---	-47.375037642262583±0.127676017293850	---	---	---	-46.9	---	---	---	-47.3	---	---
v sin i (km/s)	---	---	---	---	---	---	---	---	1.3±0.5	---	---	---	---	---	---
Sp. T	---	---	---	---	---	---	---	---	---	---	---	---	---	---	K0
ρ_✶ (g/cm³)	---	---	---	0.7884200+0.1703423-0.1334739	---	---	---	---	---	---	---	---	---	---	---

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HD 12661 b Planetary Parameters (7 Solutions)

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Status: Confirmed Planet

Detected By: Astrometry, Radial Velocity

Tools: Planetary Systems

Source	Stassun et al. 2017	An et al. 2025	Rosenthal et al. 2021	Liu et al. 2014	Wright et al. 2009	Butler et al. 2006	Fischer et al. 2001
T_p (days)	---	---	---	---	2454152.76±0.87	2450214.1±2.9	2451542.5±4.3 (JD)
ω (deg)	---	---	-60.62±0.74	---	296.0±1.5	296.3±2.6	323.1±8.5
M_p sin i (M_⨁)	772±44	757.1±25.4	725.6+19.4-19.7	691.569±11.759	731±60	743.7±60.4	887
M_p sin i (M_Jup)	2.43±0.14	2.382±0.080	2.283+0.061-0.062	2.176±0.037	2.30±0.19	2.34±0.19	2.79
e	0.38±0.01	0.3598+0.0059-0.0060	0.3597+0.0046-0.0044	0.3768±0.0077	0.3768±0.0077	0.361±0.011	0.230±0.024
P (days)	262.70862±0.08300	262.367±0.025	262.360+0.017-0.016	262.709±0.083	262.709±0.083	262.53±0.27	252.7±2.7
K (m/s)	73.6±0.6	---	73.59+0.36-0.37	73.56±0.56	73.56±0.56	74.19±0.85	88.4±2.0
a (au)	0.84±0.02	0.843±0.014	0.824±0.011	0.8079±0.0052	0.831±0.048	0.831±0.048	0.79
i (deg)	---	86.0+41.0-38.0	---	---	---	---	---
T_C (days)	---	---	2456079.28+0.66-0.62 (BJD)	---	---	---	---

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HD 12661 c Planetary Parameters (5 Solutions)

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Status: Confirmed Planet

Detected By: Astrometry, Radial Velocity

Tools: Planetary Systems

Source	Liu et al. 2014	An et al. 2025	Rosenthal et al. 2021	Wright et al. 2009	Butler et al. 2006
T_p (days)	---	---	---	2456153.42±0.87	2452130±330
ω (deg)	---	---	60+110-20	165	38
M_p sin i (M_⨁)	575.884±15.255	---	589.6±17.2	610±51	581.6±50.9
M_p sin i (M_Jup)	1.812±0.048	---	1.855±0.054	1.92±0.16	1.83±0.16
e	0.031±0.022	0.0131+0.0150-0.0094	0.025±0.012	0.031±0.022	0.017±0.029
P (days)	1708.0±14.0	1699.7+3.2-3.0	1696.7+2.3-2.4	1708±14	1679.0±29.0
K (m/s)	30.41±0.62	---	29.96±0.34	30.41±0.62	29.27±0.88
a (au)	2.8145±0.0238	2.929+0.045-0.047	2.861+0.038-0.039	2.90±0.17	2.86±0.17
T_C (days)	---	---	2455774.9+7.4-7.0 (BJD)	---	---
M_p (M_⨁)	---	899+261-213	---	---	---
M_p (M_Jup)	---	2.83+0.82-0.67	---	---	---
i (deg)	---	136+11-21	---	---	---

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Ancillary Information (9 Unique Files)

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+ HD 12661 (2 File Types, 9 Files)

Literature Time Series (2 File Types, 9 Files)

File Type	Data Points	Filter	Reference
Photometric Light Curve	89	Hp (Hipparcos)	Hipparcos and Tycho Catalogs
Radial Velocity Curve	66	Optical Spectra	Wright et al. 2009
Radial Velocity Curve	40	Optical Spectra	Wright et al. 2009
Radial Velocity Curve	57	Optical Spectra	Butler et al. 2006
Radial Velocity Curve	51	Optical Spectra	Butler et al. 2006
Radial Velocity Curve	45	Optical Spectra	Fischer et al. 2003
Radial Velocity Curve	41	Optical Spectra	Fischer et al. 2003
Radial Velocity Curve	20	Optical Spectra	Fischer et al. 2001
Radial Velocity Curve	15	Optical Spectra	Fischer et al. 2001

Nearby Data (within 30 arcseconds) Browse Nearby Data

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

Data Files: 4 KELT Time Series; 1 SuperWASP Time Series; 2 Associated Literature Data

Bibliography (22 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
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
Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes
Stassun et al. 2017 Reference Overview
Precise determination of fundamental parameters of six exoplanet host stars and their planets
Liu et al. 2014 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
Ten New and Updated Multiplanet Systems and a Survey of Exoplanetary Systems
Wright et al. 2009 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
Spectroscopic [Fe/H] for 98 extra-solar planet-host stars. Exploring the probability of planet formation
Santos et al. 2004 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview
A Planetary Companion to HD 40979 and Additional Planets Orbiting HD 12661 and HD 38529
Fischer et al. 2003 Reference Overview
Statistical properties of exoplanets. II. Metallicity, orbital parameters, and space velocities
Santos et al. 2003 Reference Overview
Radial Velocities of 889 late-type stars
Nidever et al. 2002 Reference Overview
Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets
Fischer et al. 2001 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
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
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Debug Info

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https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/4/HD_12661.json

Catalog Parameters

RA

ra

02h04m34.16s

Dec

dec

+25d24m48.83s

β

elat

12.00084

λ

elon

37.77908

b

glat

-34.58321

l

glon

143.06278

m_V

sy_vmag

7.43±0.03

m_TESS

sy_tmag

6.7944±0.0060

m_J

sy_jmag

6.182±0.019

m_H

sy_hmag

5.896±0.021

m_Ks

sy_kmag

5.861±0.024

sy_kepmag

no_data

m_W1

sy_w1mag

5.794±0.139

m_W2

sy_w2mag

5.732±0.049

m_W3

sy_w3mag

5.846±0.015

m_W4

sy_w4mag

5.783±0.044

sy_icmag

no_data

m_Gaia

sy_gaiamag

7.24746±0.00037

m_B

sy_bmag

8.156±0.023

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

204.3236427±0.0890284

μ_δ

sy_pmdec

-173.3350000±0.0889099

μ_α

sy_pmra

-108.181000±0.089332

π

sy_plx

26.3927000±0.0437412

Distance

sy_dist

37.8478+0.0633-0.0630

Set Parameters

R_✶

st_rad

1.096

T_eff

st_teff

5754

HD 12661 Overview

HD 12661 Architecture & Discovery Information

HD 12661