Planet Kapteyn's b
| Name | Kapteyn's b | ||
| Planet Status | Controversial | ||
| Discovered in | 2014 | ||
| Mass | — | ||
| Mass*sin(i) | 0.0217 (± 0.009) MJ |  |
+ |
| Semi-Major Axis | 0.311 ( -0.034 +0.027 ) AU | |
+ |
| Orbital Period | 121.1 ( -0.83 +0.92 ) day | |
+ |
| Eccentricity | 0.07 ( -0.07 +0.27 ) | |
+ |
| ω | 80.4 (± 30.0) deg | |
|
| Tperi | — | ||
| Radius | — | ||
| Inclination | — | ||
| Update | 2019-06-14 | ||
| Detection Method | Radial Velocity | ||
| Mass Detection Method | Radial Velocity | ||
| Radius Detection Method | — | ||
| Primary transit | — | ||
| Secondary transit | — | ||
| λ | — | ||
| Impact Parameter b | — | ||
| Time Vr=0 | — | ||
| Velocity Semiamplitude K | 2.13 (± 0.8) m/s | |
|
| Calculated temperature | — | ||
| Measured temperature | — | ||
| Hottest point longitude | — | ||
| Geometric albedo | — | ||
| Surface gravity log(g/gH) | — | ||
| Alternate Names | — |
Star
Kapteyn's| Name | Kapteyn's | ||
| Distance | 3.91 (± 0.01) pc | |
|
| Spectral type | dM1 | ||
| Apparent magnitude V | 8.8 | ||
| Mass | 0.281 (± 0.014) MSun | |
|
| Age | 8.0 (± 7.5) Gyr | |
|
| Effective temperature | 3550.0 (± 50.0) K | |
|
| Radius | 0.29 (± 0.025) RSun | |
|
| Metallicity [Fe/H] | -0.86 | |
|
| Detected Disc | — | ||
| Magnetic Field | — | ||
| RA2000 | 05:11:41.0 | ||
| Dec2000 | -45:01:06 | ||
| Alternate Names | |||
| Planetary system | 1 planet |
Observability Predictor 
Remarks
13 May 2015: According to Robertson, Mahadevan & Roy (2015) "Kapteyn b is not a planet in the Habitable Zone, but an artifact of stellar activity."Related publications
Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
2022
KERVELLA P., ARENOU F. & THEVENIN F.
Astron. & Astrophys., 657, A7
paper arxiv
The Detectability of Nightside City Lights on Exoplanets
2022
BEATTY Th.
MNRAS, 513, 2652
paper arxiv
A Gaussian Process Regression Reveals No Evidence for Planets Orbiting Kapteyn's Star
2021
BORTLE A., FAUSEY H., JI J., DODSON-ROBINSON S., DELGADO V. & GIZIS J.
Astron. J., 161, 230
paper arxiv
Frequency of planets orbiting M dwarfs in the Solar neighbourhood
2019
TUOMI M., JONES H., ANGLADA-ESCUDE G., BUTLER P., ARRIAGADA P. et al.
ApJ. Suppl., submitted
arxiv
Transition from eyeball to snowball driven by sea-ice drift on tidally locked terrestrial planets
2019
YANG J., JI W. & ZENG Y.
Nature Astronomy, in press
paper
Living with a Red Dwarf: Rotation and X-ray and Ultraviolet Properties of the Halo Population Kapteyn's Star
2016
GUINAN E., ENGLE S. & DURBIN A.
ApJ, 821, 81
paper arxiv
Stellar activity mimics a habitable-zone planet around Kapteyn's star
2015
ROBERTSON P., ROY A. & MAHADEVAN S.
ApJ Letters, 805, L72
paper arxiv ADS
Global warming as a detectable thermodynamic marker of Earth-like extrasolar civilizations: the case for a telescope like Colossus
2015
KUHN J. & BERDYGINA S.
Int. J. Astrobiol., 14, 401
paper ADS
No evidence for activity correlations in the radial velocities of Kapteyn's star
2015
ANGLADA-ESCUDE G., TUOMI M., ARRIAGADA P., ZECHMEISTER M., JENKINS J. et al.
ApJ, 830, 74
paper
arxiv
Two planets around Kapteyn's star : a cold and a temperate super-Earth orbiting the nearest halo red-dwarf
2014
ANGLADA-ESCUD2 G., ARRIAGADA P., TUOMI M., ZECHMEISTER M., JENKINS J. et al.
MNRAS, 443, L89
paper arxiv
