Kapteyn Overview

Kapteyn 0.25 R_⦿ 3819.00 K

Kapteyn b

Kapteyn c

Overview Notes 2 Parameters Ancillary 1 Nearby Data Bibliography 21 Legend Expand All

Kapteyn Architecture & Discovery Information

Name	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 c	121.54 d	> 7 M_⨁	Radial Velocity	2014	Anglada-Escudé et al. 2014	Confirmed Planet

Exoplanet Archive Notes (2)

Kapteyn b

Confirmed planet signal refuted in ref. (Robertson et al. 2015)

Kapteyn c

Planet flagged as controversial. (Bortle et al. 2021)

Kapteyn Stellar Parameters (10 Solutions)

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: m_V
8.86±0.10; m_TESS
7.0528900±0.0074041; m_J
5.821±0.026; m_H
5.316±0.027; m_Ks
5.049±0.021; m_W1
4.921±0.204; m_W2
4.295±0.108; m_W3
4.733±0.016; m_W4
4.600±0.027; m_Ic
6.895; m_Gaia
8.061980±0.000588; m_B
10.329±0.037

Abundances (Hypatia Catalog): [Fe/H] -1.00±0.04 dex; [O/H] -0.65±0.09 dex

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

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	---	---	---	---	---
T_eff (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	---	---	---	---	---	---	---	---	---

Kapteyn b Planetary Parameters (1 Solution)

Status: False Positive Planet

Detected By: Radial Velocity

Tools

Source	Anglada-Escudé et al. 2014
ω (deg)	80.40+30.70-28.90
M_p sin i (M_⨁)	4.8+0.9-1.0
M_p sin i (M_Jup)	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

Kapteyn c Planetary Parameters (1 Solution)

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
M_p sin i (M_⨁)	7.0 +1.2-1.0
M_p sin i (M_Jup)	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

Ancillary Information (1 Unique File)

+ Kapteyn (1 File Type, 1 File)

Literature Time Series (1 File Type, 1 File)

File Type	Data Points	Filter	Reference
Photometric Light Curve	103	Hp (Hipparcos)	Hipparcos and Tycho Catalogs

Nearby Data (within 30 arcseconds) Browse Nearby Data

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

Data Files: 1 Associated Literature Data

Bibliography (21 References)

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

Legend

System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
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Debug Info

https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/4/Kapteyn.json

Kapteyn

Catalog Parameters

05h11m50.08s

Dec

dec

-45d02m34.87s

elat

-67.53607

elon

67.3045

glat

-35.97592

glon

250.56446

m_V

sy_vmag

8.86±0.10

m_TESS

sy_tmag

7.0528900±0.0074041

m_J

sy_jmag

5.821±0.026

m_H

sy_hmag

5.316±0.027

m_Ks

sy_kmag

5.049±0.021

sy_kepmag

no_data

m_W1

sy_w1mag

4.921±0.204

m_W2

sy_w2mag

4.295±0.108

m_W3

sy_w3mag

4.733±0.016

m_W4

sy_w4mag

4.600±0.027

m_Ic

sy_icmag

6.895

m_Gaia

sy_gaiamag

8.061980±0.000588

m_B

sy_bmag

10.329±0.037

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

sy_pm

8644.9046131±0.0498602

μ_δ

sy_pmdec

-5709.2200000±0.0511962

μ_α

sy_pmra

6491.4700000±0.0488017

sy_plx

254.2260000±0.0263103

Distance

sy_dist

3.93305±0.00041

Set Parameters

R_✶

st_rad

0.25

T_eff

st_teff

3819