Kapteyn Overview
Kapteyn
0.25
R⦿
3819.00
K
Χ
Kapteyn b
!
Kapteyn c
Discovery Data
| Host | Planet | Orbital Separation | Planet Size | Method | Year | Reference | Disposition |
|---|---|---|---|---|---|---|---|
| Kapteyn | Kapteyn b | 48.62 d | > 4.8 M⨁ | Radial Velocity | 2014 | Anglada-Escudé et al. 2014 | False Positive Planet |
| Kapteyn | Kapteyn c | 121.54 d | > 7 M⨁ | Radial Velocity | 2014 | Anglada-Escudé et al. 2014 | Confirmed Planet |
Kapteyn b
- Confirmed planet signal refuted in ref. (Robertson et al. 2015)
- Planet flagged as controversial. (Bortle et al. 2021)
- RA
- 05h11m50.08s
- Dec
- -45d02m34.87s
- Distance
- 3.93305±0.00041 pc
- Parallax
- 254.2260000±0.0263103 mas
- Ecliptic Latitude
- -67.53607 deg
- Ecliptic Longitude
- 67.3045 deg
- Galactic Latitude
- -35.97592 deg
- Galactic Longitude
- 250.56446 deg
- Total Proper Motion
- 8644.9046131±0.0498602 mas/yr
- Proper Motion (RA)
- 6491.4700000±0.0488017 mas/yr
- Proper Motion (Dec)
- -5709.2200000±0.0511962 mas/yr
- Photometry
-
mV8.86±0.10
-
mTESS7.0528900±0.0074041
-
mJ5.821±0.026
-
mH5.316±0.027
-
mKs5.049±0.021
-
mW14.921±0.204
-
mW24.295±0.108
-
mW34.733±0.016
-
mW44.600±0.027
-
mIc6.895
-
mGaia8.061980±0.000588
-
mB10.329±0.037
-
Abundances
(Hypatia Catalog) -
[Fe/H] -1.00±0.04 dex
-
[O/H] -0.65±0.09 dex
| Source | TICv8 | Gaia DR2 | Turnbull 2015 | Anglada-Escudé et al. 2014 | Wright et al. 2004 | Nordstrom et al. 2004 | Nidever et al. 2002 | Hawley et al. 1996 | Michigan Catalog, Vol. 2 | Cannon & Pickering 1918 |
|---|---|---|---|---|---|---|---|---|---|---|
|
S Index
|
--- | --- | --- | --- | 0.325±0.042 | --- | --- | --- | --- | --- |
|
Teff
(K)
|
3742.0±157.0 |
3979.3652+120.4550-84.2852
|
3819 | 3550±50 | --- | --- | --- | --- | --- | --- |
|
L✶
(log10(L⦿))
|
-1.79289+0.08950-0.11286
|
--- |
-2.000 +1.000-0.903
|
--- | --- | --- | --- | --- | --- | --- |
|
M✶
(M⦿)
|
0.278894±0.020187 | --- | 0.32 | 0.281±0.014 | --- | --- | --- | --- | --- | --- |
|
R✶
(R⦿)
|
0.3019940±0.0090516 | --- | 0.25 | 0.291±0.025 | --- | --- | --- | --- | --- | --- |
|
Sp. T
|
--- | --- | M2.0V | --- | --- | --- | --- | M1.0 | M0 V | K2 |
|
γ
(km/s)
|
--- | 244.98714856994843±0.18186498653436 | --- | --- | --- | 245.2±0.2 | 245.2 | --- | --- | --- |
|
v sin i
(km/s)
|
--- | --- | --- | --- | --- | 6 | --- | --- | --- | --- |
|
Metallicity
(dex)
|
--- | --- | --- | -0.89 [M/H] | --- | --- | --- | --- | --- | --- |
|
ρ✶
(g/cm3)
|
14.2760421±0.2486074 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|
log g
(log10(cm/s2))
|
4.9235100±0.0054486 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
- Status
- False Positive Planet
- Detected By
- Radial Velocity
- Tools
| Source | Anglada-Escudé et al. 2014 |
|---|---|
|
ω
(deg)
|
80.40+30.70-28.90
|
|
Mp sin i
(M⨁)
|
4.8+0.9-1.0
|
|
Mp sin i
(MJup)
|
0.015+0.003-0.003
|
|
e
|
0.21+0.11-0.10
|
|
P
(days)
|
48.616+0.036-0.032
|
|
K
(m/s)
|
2.25±0.31 |
|
a
(au)
|
0.168+0.006-0.008
|
- Status
-
Confirmed Planet
- Controversial
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Anglada-Escudé et al. 2014 |
|---|---|
|
ω
(deg)
|
3.9 +28.9-33.2
|
|
Mp sin i
(M⨁)
|
7.0 +1.2-1.0
|
|
Mp sin i
(MJup)
|
0.022 +0.004-0.003
|
|
e
|
0.23 +0.10-0.12
|
|
P
(days)
|
121.54±0.25 |
|
K
(m/s)
|
2.27 +0.28-0.26
|
|
a
(au)
|
0.311 +0.038-0.014
|
Literature Time Series
(1 File Type, 1 File)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 103 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
- Known Objects
- 1 Confirmed Planets
- 1 2MASS Point Source Catalog
- Data Files
- 1 Associated Literature Data
-
A Gaussian Process Regression Reveals No Evidence for Planets Orbiting Kapteyn's Star
Bortle 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 -
ExoCat-1: The Nearby Stellar Systems Catalog for Exoplanet Imaging Missions
Turnbull 2015 | Reference Overview -
Stellar Activity Mimics a Habitable-zone Planet around Kapteyn's Star
Robertson et al. 2015 | Reference Overview -
Two planets around Kapteyn's star: a cold and a temperate super-Earth orbiting the nearest halo red dwarf
Anglada-Escudé et al. 2014 | Reference Overview -
All WISE Data Release
Cutri et al. 2014 | Reference Overview -
Validation of the new Hipparcos reduction
van Leeuwen et al. 2007 | Reference Overview -
Further observations of Hipparcos red stars and standards for UBV(RI)_C photometry
Kilkenny et al. 2007 | 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 -
Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog
Bakos et al. 2002 | Reference Overview -
Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
van Altena et al. 2001 | 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 Palomar/MSU nearby star spectroscopic survey. II. The southern M dwarfs and investigations of magnetic activity.
Hawley et al. 1996 | Reference Overview -
VRI photometry of nearby stars.
Cousins 1980a | Reference Overview -
Michigan Catalog of two-dimensional spectral types for the HD stars, Vol 2
Michigan Catalog, Vol. 2 | Reference Overview -
The Henry Draper catalogue 0h, 1h, 2h, and 3h
Cannon & Pickering 1918 | Reference Overview
- System
- Star
- Confirmed
- Candidate
- False Positive Planet
- Controversial
- False Positive
- Aliases
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- Time Series
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