Kapteyn c

Kapteyn c is a presumed planet orbiting the nearby Kapteyn's Star. It has a mass of about ≥7.0M_⊕, a semimajor axis of ~0.311AU and an orbital eccentricity of 0.23±0.1. It is beyond the host star's habitable zone.^[1] ^[2]

It has been described by its discoverers as a cold super earth.^[3]

See diagram here

References

↑ David Dickinson, Discovered: Two New Planets for Kapteyn’s Star (June 4, 2014).
↑ Kapteyn's Star at SolStations.com.
↑ Guillem Anglada-Escudé, Pamela Arriagada, Mikko Tuomi, Mathias Zechmeister, James S. Jenkins, Aviv Ofir, Stefan Dreizler, Enrico Gerlach, Chris J. Marvin, Ansgar Reiners, Sandra V. Jeffers, R. Paul Butler, Steven S. Vogt, Pedro J. Amado, Cristina Rodríguez-López, Zaira M. Berdiñas, Julian Morin, Jeff D. Crane, Stephen A. Shectman, Ian B. Thompson, Matías Díaz, Eugenio Rivera, Luis F. Sarmiento, Hugh R.A. Jones, Two planets around Kapteyn's star : a cold and a temperate super-Earth orbiting the nearest halo red-dwarf.(Cornell University 3rd June 2014).

Known celestial objects within 20 light-years

Primary member type

Celestial objects by systems. Secondary members are listed in small print.

0–5 ly →

Main-sequence
stars

G-type	Sun (0 ly) rest of Solar System α Cen (4.366±0.007 ly) K-type main-sequence star B red dwarf C (Proxima Centauri) (4.2430 ± 0.0017 ly) planet Bb

← 5–10 ly →

Main-sequence
stars

A-type	Sirius (α CMa) (8.60±0.04 ly) white dwarf B

M-type (red dwarfs)	Barnard's Star (5.980±0.003 ly) Wolf 359 (7.78±0.04 ly) Lalande 21185 (8.307±0.014 ly) L 726-8 (8.73±0.06 ly) red dwarf UV Cet Ross 154 (9.69±0.06 ly)

Brown dwarfs

L-type	Luhman 16 (6.59±0.06 ly) T-type brown dwarf B

Sub-brown dwarfs
and rogue planets

Y-type	WISE 0855−0714 (7.53+0.27 −0.25 ly)

← 10–15 ly →

Main-sequence
stars

F-type	Procyon (α CMi) (11.41+0.04 −0.03 ly) white dwarf B

G-type	τ Cet (11.905±0.007 ly) 5? planets: b c d e f

K-type	ε Eri (10.475±0.003 ly) 1 (2?) planets: b c? 61 Cyg (11.409±0.022 ly) K-type main-sequence star B ε Ind (11.815±0.012 ly) 2 T-type brown dwarfs: Ba Bb 1? planets

M-type (red dwarfs)	Ross 248 (10.298±0.023 ly) Lac 9352 (10.685+0.025 −0.024 ly) Ross 128 (10.94±0.06 ly) EZ Aqr (11.08±0.13 ly) 2 red dwarfs: B C Σ 2398 (11.40±0.07 ly) red dwarf B Gmb 34 (11.70±0.03 ly) red dwarf B planet Ab SIPS 1259-4336 (11.8+2.1 −1.5 ly) DX Cnc (11.83±0.13 ly) GJ 1061 (12.04±0.06 ly) YZ Cet (12.20±0.14 ly) Luyten's Star (12.20±0.04 ly) Kapteyn's Star (12.78±0.04 ly) 2 planets: b c Lac 8760 (12.87±0.04 ly) Kruger 60 (13.18±0.08 ly) red dwarf B Ross 614 (13.36±0.04 ly) red dwarf B Wolf 1061 (14.0±0.1 ly) Wolf 424 (14.05+0.27 −0.26 ly) red dwarf B GJ 1 (14.15±0.06 ly) TZ Ari (14.51+0.19 −0.18 ly) LHS 292 (14.76±0.24 ly) GJ 687 (14.77±0.06 ly) planet b GJ 674 (14.81+0.10 −0.09 ly) planet b G 208-44 (14.81±0.07 ly) 2 red dwarfs: B G 208-45

White dwarf stars	van Maanen 2 (14.03+0.12 −0.11 ly)

Brown dwarfs

M-type	SCR 1845-6357 (12.57±0.05 ly) T-type brown dwarf B Teegarden's star (12.58±0.05 ly) DEN 1048-3956 (13.15±0.03 ly) 2M1540 (14.3+1.7 −1.4 ly)

T-type	WISE 1506+7027 (11.1+2.3 −1.3 ly) UGPS 0722-05 (13.43±0.13 ly)

Y-type	WISE 0350−5658 (12.1+5.2 −1.3 ly)

← 15–20 ly →

Subgiant stars

G-type	δ Pav (19.923±0.021 ly)

Main-sequence
stars

A-type	Altair (α Aql) (16.73±0.05 ly)

G-type	σ Dra «Alsafi» (18.769±0.019 ly) η Cas «Achird» (19.42±0.06 ly) K-type main-sequence star B e (82 G.) Eri (19.711±0.023 ly) 3 planets: b c d

K-type	Groombridge 1618 (15.89±0.04 ly) ο² (40) Eri «Keid» (16.257±0.019 ly) white dwarf B red dwarf C 70 Oph (16.58±0.07 ly) K-type main-sequence star B GJ 570 (19.05+0.11 −0.10 ly) 2 red dwarfs: B C T-type brown dwarf D 36 Oph (19.35±0.06 ly) 2 K-type main-sequence stars: B C HR 7703 (19.62±0.03 ly) red dwarf B

M-type (red dwarfs)	GJ 876 (15.198±0.014 ly) 4 (6?) planets: d f? g? c b e GJ 1002 (15.33+0.24 −0.23 ly) LHS 288 (15.61+0.21 −0.20 ly) GJ 412 (15.81±0.08 ly) red dwarf B AD Leo (16.00±0.22 ly) GJ 832 (16.16±0.08 ly) 2 planets: c b EV Lac (16.37±0.08 ly) GJ 682 (16.56±0.18 ly) 2 planets: b c G 9-38 (17.05+0.23 −0.22 ly) red dwarf B GJ 3379 (17.08±0.17 ly) LHS 1723 (17.36±0.12 ly) GJ 445 (17.58+0.14 −0.13 ly) GJ 526 (17.73±0.10 ly) Stein 2051 (18.06±0.08 ly) white dwarf B GJ 251 (18.22±0.16 ly) GJ 205 (18.45±0.12 ly) LP 816-60 (18.6±0.4 ly) GJ 229 (18.77±0.11 ly) T-type brown dwarf B 1? planets: Ab? GJ 693 (18.95+0.25 −0.24 ly) Ross 47 (18.99±0.12 ly) GJ 752 (19.05±0.08 ly) red dwarf B (vB 10) GJ 754 (19.30±0.18 ly) TYC 3980-1081-1 (19.3±4.3 ly) GJ 588 (19.34±0.15 ly) YZ CMi (19.43+0.27 −0.26 ly) GJ 908 (19.50±0.14 ly) GJ 1005 (19.58±0.09 ly) red dwarf B 2MASS J05332802-4257205 (~19.6 ly) 2MASS J18450079-1409036 (~19.6 ly) red dwarf B GJ 268 (19.74±0.25 ly) red dwarf B

White dwarf stars	LP 145-141 (15.11±0.09 ly) G 240-72 (19.80+0.29 −0.28 ly)

Brown dwarfs

M-type	2MASS 1835+3259 (18.48±0.05 ly)

L-type	DEN 0255-4700 (16.20+0.32 −0.31 ly)

T-type	DEN 0817-6155 (16.1+1.1 −1.0 ly) WISE J0521+1025 (16.3±4.2 ly) 2MASS 0939-2448 (17.4±0.4 ly) T-type brown dwarf B WISE 1741+2553 (18.1+1.6 −1.4 ly) 2MASS 1114-2618 (18.20±0.14 ly) 2MASS 0415-0935 (18.62±0.18 ly) WISE J2000+3629 (19.4±6.7 ly) 2MASS 0937+2931 (19.96+0.22 −0.21 ly)

Y-type	WISE 1639-6847 (16.12+0.25 −0.24 ly) WISE 0359−5401 (19.2+4.2 −2.6 ly)

Sub-brown dwarfs
and rogue planets

Y-type	WISE 1541−2250 (18.6±0.5 ly)

Italic are systems without known trigonometric parallax.