alf Cen Overview
Proxima Cen
0.14
R⦿
3295.50
K
Proxima Cen b
?
Proxima Cen c
Proxima Cen d
alf Cen B
0.86
R⦿
5214.00
K
Χ
alf Cen B b
alf Cen A
1.25
R⦿
5801.00
K
?
alf Cen A b
- Architecture
- alf Cen
- Proxima Cen
- alf Cen B
- alf Cen A
Discovery Data
| Host | Planet | Orbital Separation | Planet Size | Method | Year | Reference | Disposition |
|---|---|---|---|---|---|---|---|
| Proxima Cen | Proxima Cen b | 11.18 d | > 1.06 M⨁ | Radial Velocity | 2016 | Anglada-Escudé et al. 2016 | Confirmed Planet |
| alf Cen B | alf Cen B b | 3.24 d | > 1.13 M⨁ | Radial Velocity | 2022 | Dumusque et al. 2012 | False Positive Planet |
| Proxima Cen | Proxima Cen c | 1900 d | > 5.8 M⨁ | Radial Velocity | 2020 | Damasso et al. 2020 | Candidate Planet |
| Proxima Cen | Proxima Cen d | 5.12 d | > 0.26 M⨁ | Radial Velocity | 2025 | Suárez Mascareño et al. 2025 | Confirmed Planet |
| alf Cen A | alf Cen A b | 1.9 au | --- | Imaging | 2021 | Wagner et al. 2021 | Candidate Planet |
Proxima Cen
- Some stellar parameter values may be biased due to companion blend (WDS Catalog)
- Some stellar parameter values may be biased due to companion blend (WDS Catalog)
- Some stellar parameter values may be biased due to companion blend (WDS Catalog)
- Confirmed planet signal refuted in ref. (Rajpaul et al. 2016)
- Planet semi-major axis, eccentricity, equilibrium temperature entered as ranges across several different models (Beichman & Sanghi et al. 2025)
- Planet radius, semi-major axis, and orbital inclination estimated from range given in ref. (Wagner et al. 2021)
- RA
- 14h29m34.43s
- Dec
- -62d40m34.26s
- Distance
-
1.30119+0.00034-0.00035pc
- Parallax
- 768.500000±0.203021 mas
- Ecliptic Latitude
- -44.7676 deg
- Ecliptic Longitude
- 239.08815 deg
- Galactic Latitude
- -1.91805 deg
- Galactic Longitude
- 313.92595 deg
- Total Proper Motion
- 3858.8657674±0.0915852 mas/yr
- Proper Motion (RA)
- -3781.3100000±0.0851812 mas/yr
- Proper Motion (Dec)
- 769.766000±0.188955 mas/yr
- Photometry
-
mV11.01±0.10
-
mTESS7.360±0.036
-
mJ5.357±0.023
-
mH4.835±0.057
-
mKs4.384±0.033
-
mW1---
-
mW2---
-
mW3---
-
mW4---
-
mIc7.442
-
mGaia8.953610±0.000918
-
mB12.782±0.260
| Source | Suárez Mascareño et al. 2025 | Faria et al. 2022 | Damasso et al. 2020 | TICv8 | Jenkins et al. 2019 | Gaia DR2 | Anglada-Escudé et al. 2016 | Turnbull 2015 | Hawley et al. 1996 |
|---|---|---|---|---|---|---|---|---|---|
|
Teff
(K)
|
2900±100 | 2900±100 | --- | --- | --- |
3295.5000+42.8333-4.8333
|
3050±100 | --- | --- |
|
Sp. T
|
M5.5 V | M5.5 V | M5.5 V | --- | --- | --- | M5.5 V | M5.0V | M5.5 |
|
M✶
(M⦿)
|
0.1221±0.0022 | 0.1221±0.0022 | --- | 0.1256330±0.0200699 | --- | --- | 0.120±0.015 | 0.16 | --- |
|
L✶
(log10(L⦿))
|
-2.82+0.02-0.02
|
-2.8+0.1-0.2
|
--- | --- | --- | --- |
-2.81+0.02-0.02
|
--- | --- |
|
R✶
(R⦿)
|
0.141±0.021 | 0.141±0.021 | --- | 0.1537190±0.0048239 | 0.154 | --- | 0.141±0.021 | --- | --- |
|
Prot
(days)
|
83.2±1.6 | 90±4 | --- | --- | --- | --- | 83 | --- | --- |
|
ρ✶
(g/cm3)
|
--- | --- | --- | 48.7626491±3.2302081 | --- | --- | --- | --- | --- |
|
log g
(log10(cm/s2))
|
--- | --- | --- | 5.1637200±0.0427119 | --- | --- | --- | --- | --- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Suárez Mascareño et al. 2025 | Faria et al. 2022 | Damasso et al. 2020 | Jenkins et al. 2019 | Anglada-Escudé et al. 2016 |
|---|---|---|---|---|---|
|
Tp
(days)
|
2460548.59±0.12
(JD)
|
--- | --- | --- | --- |
|
Teq
(K)
|
218±18 | --- |
216+91-99
|
--- |
234+6-14
|
|
S
(S⨁)
|
0.641±0.065 | --- | --- | --- | 0.65 |
|
Mp sin i
(M⨁)
|
1.055±0.055 | 1.07±0.06 | 1.0±0.1 | --- |
1.27+0.19-0.17
|
|
Mp sin i
(MJup)
|
0.003319±0.000173 | 0.00337±0.00019 | 0.0031±0.0003 | --- |
0.00400+0.00060-0.00053
|
|
e
|
0 |
0.02+0.04-0.02
|
0 |
0.080+0.070-0.060
|
<0.35 |
|
P
(days)
|
11.18465±0.00053 |
11.1868+0.0029-0.0031
|
11.185±0.001 |
11.1855+0.0016-0.0014
|
11.186+0.001-0.002
|
|
K
(m/s)
|
1.226±0.062 | 1.24±0.07 | 1.2±0.1 |
1.32+0.12-0.14
|
1.38±0.21 |
|
a
(au)
|
0.04848±0.00029 | 0.04856±0.00030 | 0.048±0.002 | --- |
0.0485+0.0041-0.0051
|
|
ω
(deg)
|
--- |
3.3+1.8-2.3
|
--- |
252+48-199
|
310 |
|
TC
(days)
|
--- | --- |
2457897.9+0.3-0.2
(BJD)
|
--- | --- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Suárez Mascareño et al. 2025 | Faria et al. 2022 | Show Candidate Solutions >> | << Hide Candidate Solutions |
|---|---|---|---|---|
|
Tp
(days)
|
2460557.55±0.16
(JD)
|
--- | ||
|
Teq
(K)
|
282±23 | --- | ||
|
S
(S⨁)
|
1.814±0.098 | --- | ||
|
Mp sin i
(M⨁)
|
0.260±0.038 | 0.26±0.05 | ||
|
Mp sin i
(MJup)
|
0.000818±0.000120 | 0.00082±0.00016 | ||
|
e
|
0 |
0.040+0.150-0.040
|
||
|
P
(days)
|
5.12338±0.00035 |
5.122+0.002-0.036
|
||
|
K
(m/s)
|
0.392±0.057 | 0.39±0.07 | ||
|
a
(au)
|
0.02881±0.00017 |
0.02885+0.00019-0.00022
|
||
|
ω
(deg)
|
--- |
4.0+2.0-1.7
|
- Status
- Candidate Planet
- Detected By
- Radial Velocity
- Tools
| Source | Damasso et al. 2020 |
|---|---|
|
Teq
(K)
|
39+16-18
|
|
Mp sin i
(M⨁)
|
5.8±1.9 |
|
Mp sin i
(MJup)
|
0.018±0.006 |
|
e
|
0 |
|
P
(days)
|
1900+96-82
|
|
K
(m/s)
|
1.2±0.4 |
|
a
(au)
|
1.48±0.08 |
|
TC
(days)
|
2455892+101-102
|
- RA
- 14h39m39.39s
- Dec
- -60d50m22.10s
- Distance
- 1.347491±0.002542 pc
- Parallax
- 742.12±1.40 mas
- Ecliptic Latitude
- -42.59689 deg
- Ecliptic Longitude
- 239.4858 deg
- Galactic Latitude
- -.68705 deg
- Galactic Longitude
- 315.73733 deg
- Total Proper Motion
- 3724.1151398±25.7328564 mas/yr
- Proper Motion (RA)
- -3600.35±26.10 mas/yr
- Proper Motion (Dec)
- 952.11±19.75 mas/yr
- Photometry
-
mV1.35±0.03
-
mTESS-0.150±1.500
-
mJ---
-
mH---
-
mKs-2.008±0.260
-
mW1>0.443
-
mW2>0.095
-
mW3-1.484±0.392
-
mW4-1.794±0.002
-
mIc0.462
-
mGaia---
-
mB2.180
| Source | Turnbull 2015 | Maldonado et al. 2015 | Santos et al. 2013 | Dumusque et al. 2012 | Takeda et al. 2007 | Gray et al. 2006 | Valenti & Fischer 2005 | Pizzolato et al. 2003 | Garrison & Beattie 1998 | Henry et al. 1996 | Cannon & Pickering 1918 | Beichman & Sanghi et al. 2025 | Show Candidate Solutions >> | << Hide Candidate Solutions |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
S Index
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | 0.198±0.043 | --- | --- | ||
|
Teff
(K)
|
5178 | 5251±23 | 5234±63 | 5214±33 | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
M✶
(M⦿)
|
0.88 | --- | 0.87±0.07 | 0.934±0.006 |
0.877+0.028-0.013
|
--- | --- | --- | --- | --- | --- | 0.9092±0.0025 | ||
|
R✶
(R⦿)
|
0.88 | --- | --- | 0.863 | 0.88±0.02 | --- | --- | --- | --- | --- | --- | --- | ||
|
Sp. T
|
K0V | --- | --- | K1 V | --- | K2 IV C2+1 ** | --- | --- | K1 V | --- | K5 | K1 V | ||
|
L✶
(log10(L⦿))
|
-0.284 +0.040-0.044
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
-0.3027+0.0006-0.0006
|
||
|
Metallicity
(dex)
|
0.23 [Fe/H] | 0.26±0.03 [Fe/H] | 0.16±0.04 [Fe/H] | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
Age
(Gyr)
|
8 | --- | --- | --- | >11.36 | --- | --- | --- | --- | --- | --- | --- | ||
|
log g
(log10(cm/s2))
|
4.52 | 4.56±0.05 | 4.40±0.11 | --- | 4.52±0.02 | --- | --- | --- | --- | --- | --- | --- | ||
|
γ
(km/s)
|
--- | --- | --- | --- | --- | --- | -18.6 | --- | --- | --- | --- | --- | ||
|
v sin i
(km/s)
|
--- | --- | --- | --- | --- | --- | 0.9±0.5 | --- | --- | --- | --- | --- | ||
|
Prot
(days)
|
--- | --- | --- | --- | --- | --- | --- | 42.00 | --- | --- | --- | --- |
- Status
- False Positive Planet
- Detected By
- Radial Velocity
- Tools
| Source | Dumusque et al. 2012 |
|---|---|
|
Tp
(days)
|
2455280.17±0.17
(BJD)
|
|
Mp sin i
(M⨁)
|
1.13±0.09 |
|
Mp sin i
(MJup)
|
0.00356±0.00028 |
|
e
|
0 |
|
P
(days)
|
3.2357±0.0008 |
|
K
(m/s)
|
0.51±0.04 |
- RA
- 14h39m40.90s
- Dec
- -60d50m06.53s
- Distance
- 1.347491±0.002542 pc
- Parallax
- 742.12±1.40 mas
- Ecliptic Latitude
- -42.59169 deg
- Ecliptic Longitude
- 239.48715 deg
- Galactic Latitude
- -.68433 deg
- Galactic Longitude
- 315.74188 deg
- Total Proper Motion
- 3709.6160801±1.5058463 mas/yr
- Proper Motion (RA)
- -3678.19±1.51 mas/yr
- Proper Motion (Dec)
- 481.84±1.24 mas/yr
- Photometry
-
mV-0.01±0.03
-
mTESS-0.01
-
mJ---
-
mH---
-
mKs-2.008±0.260
-
mW1---
-
mW2---
-
mW3---
-
mW4---
-
mIc-0.683
-
mGaia---
-
mB0.643
| Source | Turnbull 2015 | Takeda et al. 2007 | Gray et al. 2006 | Valenti & Fischer 2005 | Nordstrom et al. 2004 | Pizzolato et al. 2003 | Garrison & Beattie 1998 | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Henry et al. 1996 | Cannon & Pickering 1918 | Beichman & Sanghi et al. 2025 | Show Candidate Solutions >> | << Hide Candidate Solutions |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
S Index
|
--- | --- | --- | --- | --- | --- | --- | 0.167 | 0.160 | 0.162 | 0.169 | 0.157 | 0.196±0.025 | --- | --- | ||
|
CAII LOG RHK
|
--- | --- | --- | --- | --- | --- | --- | -4.97 | -5.01 | -5.00 | -4.97 | -5.03 | --- | --- | --- | ||
|
Teff
(K)
|
5801 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
L✶
(log10(L⦿))
|
0.207 +0.018-0.019
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
0.17780+0.00055-0.00055
|
||
|
Metallicity
(dex)
|
0.21 [Fe/H] | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
Age
(Gyr)
|
7.84 |
7.84+1.08-1.28
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
M✶
(M⦿)
|
1.06 |
1.063+0.048-0.037
|
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | 1.0788±0.0029 | ||
|
R✶
(R⦿)
|
1.25 | 1.25±0.03 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
log g
(log10(cm/s2))
|
4.3 | 4.30±0.03 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
Sp. T
|
G2.0V | --- | G2 V | --- | --- | --- | G2 V | --- | --- | --- | --- | --- | --- | G0 | G2 V | ||
|
γ
(km/s)
|
--- | --- | --- | -21.4 | -25.1±0.3 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
v sin i
(km/s)
|
--- | --- | --- | 2.3±0.5 | 4 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ||
|
Prot
(days)
|
--- | --- | --- | --- | --- | 29.00 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
- Status
- Candidate Planet
- Detected By
- Imaging
- Tools
| Source | Beichman & Sanghi et al. 2025 | Wagner et al. 2021 |
|---|---|---|
|
i
(deg)
|
--- | 70 |
|
Rp
(R⨁)
|
--- | 7.0±4.0 |
|
Rp
(RJup)
|
--- | 0.62±0.36 |
|
a
(au)
|
1.9±0.4 | 1.1 |
|
Teq
(K)
|
208±18 | --- |
|
e
|
0.4±0.1 | --- |
Literature Time Series
(2 File Types, 7 Files)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 110 | B (Generic) | Anglada-Escudé et al. 2016 |
| Photometric Light Curve | 1813 | H-alpha | Anglada-Escudé et al. 2016 |
| Photometric Light Curve | 1799 | SII | Anglada-Escudé et al. 2016 |
| Photometric Light Curve | 170 | V (Generic) | Anglada-Escudé et al. 2016 |
| Photometric Light Curve | 180 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
| Radial Velocity Curve | 144 | Optical Spectra | Anglada-Escudé et al. 2016 |
| Radial Velocity Curve | 70 | Optical Spectra | Anglada-Escudé et al. 2016 |
Literature Time Series
(1 File Type, 1 File)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 108 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
Literature Time Series
(1 File Type, 1 File)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 111 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
-
Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of α Cen A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits
Beichman & Sanghi et al. 2025 | Reference Overview -
Diving into the planetary system of Proxima with NIRPS: Breaking the metre per second barrier in the infrared
Suárez Mascareño et al. 2025 | Reference Overview -
A candidate short-period sub-Earth orbiting Proxima Centauri
Faria et al. 2022 | Reference Overview -
Imaging low-mass planets within the habitable zone of α Centauri
Wagner et al. 2021 | Reference Overview -
A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU
Damasso et al. 2020 | Reference Overview -
The Revised TESS Input Catalog and Candidate Target List
TICv8 | Reference Overview -
Proxima Centauri b is not a transiting exoplanet
Jenkins et al. 2019 | Reference Overview -
Gaia Data Release 2
Gaia DR2 | Reference Overview -
A terrestrial planet candidate in a temperate orbit around Proxima Centauri
Anglada-Escudé et al. 2016 | Reference Overview -
Ghost in the time series: no planet for Alpha Cen B
Rajpaul et al. 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 -
SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs. I. New atmospheric parameters and masses for 48 stars with planets
Santos et al. 2013 | Reference Overview -
An Earth-mass planet orbiting alpha Centauri B
Dumusque et al. 2012 | 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 -
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 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 -
Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog
Bakos et al. 2002 | Reference Overview -
The BRIGHTEST STARS: A Revision of the RASC Observer's HandbookTable
Garrison & Beattie 1998 | 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 -
The Palomar/MSU nearby star spectroscopic survey. II. The southern M dwarfs and investigations of magnetic activity.
Hawley et al. 1996 | Reference Overview -
A Survey of Ca II H and K Chromospheric Emission in Southern Solar-Type Stars
Henry et al. 1996 | Reference Overview -
BVRI photometry of the Gliese Catalogue stars
Bessell 1990 | Reference Overview -
UBV(RI)_c photometry of faint nearby stars
Laing 1989 | Reference Overview -
VRI photometry of nearby stars.
Cousins 1980a | Reference Overview -
The Henry Draper catalogue 0h, 1h, 2h, and 3h
Cannon & Pickering 1918 | Reference Overview
- System
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- Controversial
- False Positive
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