HD 221420

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
HD 221420
HD 221420 b	10090 d	7278.27 M_⨁	Radial Velocity	2019	Kane et al. 2019	Confirmed Planet

Exoplanet Archive Notes (2)

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HD 221420 b

The authors note that the data is equally well fit by a retrograde orbital inclination of 162.2 +2.8 -2.9. (Li et al. 2021)
The authors note that the data is equally well fit by a retrograde orbital inclination of 162 +/-2 deg. (Philipot et al. 2023)

HD 221420 Stellar Parameters (14 Solutions)

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RA: 23h33m19.66s

Dec: -77d23m07.18s

Distance: 31.1415±0.0376 pc

Parallax: 32.0826000±0.0384806 mas

Ecliptic Latitude: -62.282 deg

Ecliptic Longitude: 297.79473 deg

Galactic Latitude: -38.91481 deg

Galactic Longitude: 308.31538 deg

Total Proper Motion: 16.3249779±0.0705706 mas/yr

Proper Motion (RA): 16.3037000±0.0705655 mas/yr

Proper Motion (Dec): 0.8332290±0.0724907 mas/yr

Photometry: m_V
5.82±0.03; m_TESS
5.2241±0.0062; m_J
4.997±0.252; m_H
4.527±0.238; m_Ks
4.306±0.036; m_W1
4.367±0.263; m_W2
3.809±0.166; m_W3
4.204±0.012; m_W4
4.283±0.026; m_Gaia
5.6586200±0.0013644; m_B
6.489±0.020

Abundances (Hypatia Catalog): [Fe/H] 0.34±0.38 dex; [C/H] 0.39±0.07 dex; [O/H] 0.25±0.10 dex; [Na/H] 0.49±0.09 dex; [Mg/H] 0.44±0.12 dex; [Al/H] 0.44±0.12 dex; [Si/H] 0.39±0.04 dex; [Ca/H] 0.37±0.07 dex; [BaII/H] 0.26±0.18 dex

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

Source	An et al. 2025	Philipot et al. 2023	Feng et al. 2022	Li et al. 2021	Venner et al. 2021	TICv8	Kane et al. 2019	Gaia DR2	Gray et al. 2006	Valenti & Fischer 2005	Nordstrom et al. 2004	Henry et al. 1996	Michigan Catalog, Vol. 1	Cannon & Pickering 1918
S Index	---	---	---	---	---	---	---	---	---	---	---	0.147	---	---
CAII LOG RHK	---	-5.28	---	-5.05	---	---	---	---	---	---	---	-5.09	---	---
T_eff (K)	---	---	---	---	5847±22	5847.3700+92.7241-118.5930	5830±44	5773.5+93.5-97.5	---	---	---	---	---	---
Metallicity (dex)	---	---	---	0.34±0.07 [Fe/H]	0.33±0.02 [Fe/H]	0.3352210±0.0105146 [M/H]	0.29±0.03 [Fe/H]	---	---	---	---	---	---	---
M_✶ (M_⦿)	1.340±0.070	1.34±0.07	1.060±0.133	1.28±0.08	1.351±0.013	1.0600000+0.1843400-0.0822995	1.67±0.11	---	---	---	---	---	---	---
log g (log₁₀(cm/s²))	---	---	---	---	4.03±0.03	3.8926800+0.0642696-0.0781251	4.08±0.06	---	---	---	---	---	---	---
γ (km/s)	---	---	---	---	26.5901+0.0045-0.0033	---	---	26.506024567091305±0.163226928211102	---	26.1	26.0±0.2	---	---	---
v sin i (km/s)	---	0.71	---	---	---	---	---	---	---	2.8±0.5	4	---	---	---
Sp. T	---	G1 V	---	G2 V	G2 IV-V	---	---	---	G2 IV-V	---	---	---	G2 V	K0
L_✶ (log₁₀(L_⦿))	---	---	---	0.5855+0.0080-0.0082	0.6029+0.0009-0.0009	0.59323111+0.01354395-0.01015666	---	0.60292765+0.00086335-0.00086505	---	---	---	---	---	---
R_✶ (R_⦿)	---	---	---	---	1.947±0.013	1.9290700+0.0927196-0.0688231	---	2.0009587+0.0693338-0.0632687	---	---	---	---	---	---
ρ_✶ (g/cm³)	---	---	---	---	---	0.2081764+0.0468051-0.0343754	---	---	---	---	---	---	---	---
Age (Gyr)	---	3.7±0.5	---	6.60+3.70-2.00	3.65±0.23	---	---	---	---	---	---	---	---	---

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HD 221420 b Planetary Parameters (6 Solutions)

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Status: Confirmed Planet

Detected By: Astrometry, Radial Velocity

Tools: Planetary Systems

Source	Venner et al. 2021	An et al. 2025	Philipot et al. 2023	Feng et al. 2022	Li et al. 2021	Kane et al. 2019
T_p (days)	2456440+230-260 (JD)	---	2456624+513-220 (BJD)	2448980.150+466.743-569.662 (BJD)	2456580+430-280 (JD)	---
ω (deg)	211+10-11	---	217+24-10	264.924+14.955-16.520	219+17-12	164.4+6.9-6.3
M_p (M_⨁)	7278±699	6325+540-477	6992±636	6467.8+631.2-1090.5	6547+636-509	---
M_p (M_Jup)	22.9±2.2	19.9+1.7-1.5	22±2	20.350+1.986-3.431	20.6+2.0-1.6	---
M_p sin i (M_⨁)	2002+159-95	---	---	---	1983+207-188	3083+350-318
M_p sin i (M_Jup)	6.3+0.5-0.3	---	---	---	6.24+0.65-0.59	9.70+1.10-1.00
e	0.14+0.04-0.03	0.199+0.120-0.061	0.12+0.04-0.03	0.0820±0.0150	0.162+0.035-0.030	0.42+0.05-0.07
i (deg)	164.0+1.9-2.6	160.3+3.1-5.9	14±1	13.157+2.282-0.844	17.8+2.9-2.8	---
P (days)	10090+890-560	11100+3141-1059	10066+929-1125	8615.41549+279.48259-191.17910	10120+1100-910	22482+4200-4100
K (m/s)	48.5+2.5-1.9	---	---	44.182+1.109-0.911	---	54.7+4.2-3.6
a (au)	10.15+0.59-0.38	10.79+1.90-0.72	10.1±0.7	8.398+0.414-0.379	9.990+0.740-0.700	18.5±2.3

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Ancillary Information (1 Unique File)

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+ HD 221420 (1 File Type, 1 File)

Literature Time Series (1 File Type, 1 File)

File Type	Data Points	Filter	Reference
Photometric Light Curve	152	Hp (Hipparcos)	Hipparcos and Tycho Catalogs

Nearby Data (within 30 arcseconds) Browse Nearby Data

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Known Objects: 1 Confirmed Planets; 3 2MASS Point Source Catalog

Data Files: 1 Associated Literature Data

Bibliography (19 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
A multi-technique approach to identifying and/or constraining radial-velocity substellar companions
Philipot et al. 2023 Reference Overview
3D Selection of 167 Substellar Companions to Nearby Stars
Feng et al. 2022 Reference Overview
Precise Masses and Orbits for Nine Radial-velocity Exoplanets
Li et al. 2021 Reference Overview
True Masses of the Long-period Companions to HD 92987 and HD 221420 from Hipparcos-Gaia Astrometry
Venner et al. 2021 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
Detection of Planetary and Stellar Companions to Neighboring Stars via a Combination of Radial Velocity and Direct Imaging Techniques
Kane et al. 2019 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
All WISE Data Release
Cutri et al. 2014 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
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
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
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
A Survey of Ca II H and K Chromospheric Emission in Southern Solar-Type Stars
Henry et al. 1996 Reference Overview
Michigan Catalog of two-dimensional spectral types for the HD stars, Vol 1
Michigan Catalog, Vol. 1 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_2.0/5/HD_221420.json

Catalog Parameters

RA

ra

23h33m19.66s

Dec

dec

-77d23m07.18s

β

elat

-62.282

λ

elon

297.79473

b

glat

-38.91481

l

glon

308.31538

m_V

sy_vmag

5.82±0.03

m_TESS

sy_tmag

5.2241±0.0062

m_J

sy_jmag

4.997±0.252

m_H

sy_hmag

4.527±0.238

m_Ks

sy_kmag

4.306±0.036

sy_kepmag

no_data

m_W1

sy_w1mag

4.367±0.263

m_W2

sy_w2mag

3.809±0.166

m_W3

sy_w3mag

4.204±0.012

m_W4

sy_w4mag

4.283±0.026

sy_icmag

no_data

m_Gaia

sy_gaiamag

5.6586200±0.0013644

m_B

sy_bmag

6.489±0.020

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

μ

sy_pm

16.3249779±0.0705706

μ_δ

sy_pmdec

0.8332290±0.0724907

μ_α

sy_pmra

16.3037000±0.0705655

π

sy_plx

32.0826000±0.0384806

Distance

sy_dist

31.1415±0.0376

Set Parameters

R_✶

st_rad

2.0009587+0.0693338-0.0632687

T_eff

st_teff

5830±44

HD 221420 Overview

HD 221420 Architecture & Discovery Information

HD 221420