HD 221420 Overview
HD 221420
2.00
R⦿
5830.00
K
HD 221420 b
- Architecture
- HD 221420
- HD 221420
Discovery Data
| Host | Planet | 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 |
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)
- 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
-
mV5.82±0.03
-
mTESS5.2241±0.0062
-
mJ4.997±0.252
-
mH4.527±0.238
-
mKs4.306±0.036
-
mW14.367±0.263
-
mW23.809±0.166
-
mW34.204±0.012
-
mW44.283±0.026
-
mGaia5.6586200±0.0013644
-
mB6.489±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] 0.48±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
| 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 | --- | --- |
|
Teff
(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 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
- 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 |
|---|---|---|---|---|---|---|
|
Mp
(M⨁)
|
7278±699 |
6325+540-477
|
6992±636 |
6467.8+631.2-1090.5
|
6547+636-509
|
--- |
|
Mp
(MJup)
|
22.9±2.2 |
19.9+1.7-1.5
|
22±2 |
20.350+1.986-3.431
|
20.6+2.0-1.6
|
--- |
|
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
|
|
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 |
|
Tp
(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
|
|
Mp sin i
(M⨁)
|
2002+159-95
|
--- | --- | --- |
1983+207-188
|
3083+350-318
|
|
Mp sin i
(MJup)
|
6.3+0.5-0.3
|
--- | --- | --- |
6.24+0.65-0.59
|
9.70+1.10-1.00
|
|
K
(m/s)
|
48.5+2.5-1.9
|
--- | --- |
44.182+1.109-0.911
|
--- |
54.7+4.2-3.6
|
Literature Time Series
(1 File Type, 1 File)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 152 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
- Known Objects
- 1 Confirmed Planets
- 3 2MASS Point Source Catalog
- Data Files
- 1 Associated Literature Data
-
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 -
Multi techniques approach to identify and/or constrain radial velocity sub-stellar 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
- System
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- Candidate
- False Positive Planet
- Controversial
- False Positive
- Aliases
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