GJ 251 Overview

GJ 251 0.38 R_⦿ 3423.00 K

GJ 251 b

GJ 251 c

Overview Notes 2 Parameters Ancillary 1 Nearby Data Bibliography 16 Legend Expand All

GJ 251 Architecture & Discovery Information

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
GJ 251
GJ 251 b	14.24 d	> 3.85 M_⨁	Radial Velocity	2020	Stock et al. 2020	Confirmed Planet
GJ 251 c	53.65 d	> 3.88 M_⨁	Radial Velocity	2025	Beard et al. 2025	Confirmed Planet

Exoplanet Archive Notes (2)

GJ 251 b

Equilibrium temperature was calculated assuming a Bond albedo of 0.1. (Beard et al. 2025)

GJ 251 c

Equilibrium temperature was calculated assuming a Bond albedo of 0.1. (Beard et al. 2025)

GJ 251 Stellar Parameters (10 Solutions)

RA: 06h54m48.06s

Dec: +33d15m59.27s

Distance: 5.58057±0.00198 pc

Parallax: 179.1640000±0.0631919 mas

Ecliptic Latitude: 10.37791 deg

Ecliptic Longitude: 101.61053 deg

Galactic Latitude: 15.13189 deg

Galactic Longitude: 182.93672 deg

Total Proper Motion: 828.3471043±0.1298242 mas/yr

Proper Motion (RA): -726.394000±0.133004 mas/yr

Proper Motion (Dec): -398.134000±0.118627 mas/yr

Photometry: m_V
9.89±0.10; m_TESS
7.6481900±0.0078748; m_J
6.104±0.024; m_H
5.526±0.016; m_Ks
5.275±0.023; m_W1
5.119±0.159; m_W2
4.798±0.078; m_W3
4.916±0.016; m_W4
4.786±0.031; m_Ic
7.500±0.025; m_Gaia
8.855180±0.001134; m_B
11.740±0.113

Abundances (Hypatia Catalog): [Fe/H] 0.04±0.08 dex; [C/H] 0.05±0.09 dex; [O/H] -0.35±0.09 dex; [Na/H] 0.05±0.04 dex; [Mg/H] 0.03±0.26 dex; [Al/H] 0.12±0.06 dex; [Si/H] 0.02±0.22 dex; [Ca/H] -0.17±0.06 dex

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

Source	Beard et al. 2025	Stock et al. 2020	TICv8	Gaia DR2	Turnbull 2015	Wright et al. 2004	Nidever et al. 2002	Hawley et al. 1996	Duncan et al. 1991	Cannon & Pickering 1918
S Index	---	---	---	---	---	0.760±0.099	---	---	0.7801±0.0136	---
T_eff (K)	3342±24	3451±51	3398.0±157.0	3683.39+247.28-199.39	3423	---	---	---	---	---
L_✶ (log₁₀(L_⦿))	-1.81+0.01-0.01	-1.77+0.01-0.01	-1.78926+0.09561-0.12278	---	-1.699 +0.778-0.602	---	---	---	---	---
M_✶ (M_⦿)	0.35+0.05-0.04	0.360±0.015	0.354705±0.020304	---	0.35	---	---	---	---	---
R_✶ (R_⦿)	0.36±0.01	0.364±0.011	0.3677700±0.0110554	---	0.38	---	---	---	---	---
Sp. T	---	M3.0 V	---	---	M3.0V	---	---	M3	---	K0
Metallicity (dex)	0.070+0.070-0.060 [Fe/H]	-0.030±0.160 [Fe/H]	---	---	---	---	---	---	---	---
γ (km/s)	22.3±0.2	22.654±0.025	---	---	---	---	22.9	---	---	---
v sin i (km/s)	<2	<2	---	---	---	---	---	---	---	---
log g (log₁₀(cm/s²))	4.87±0.05	4.96±0.07	4.8567800±0.0012311	---	---	---	---	---	---	---
P_rot (days)	---	122.1+1.9-2.2	---	---	---	---	---	---	---	---
ρ_✶ (g/cm³)	---	---	10.0531894±0.3307608	---	---	---	---	---	---	---
Age (Gyr)	6.80+4.60-4.70	---	---	---	---	---	---	---	---	---

GJ 251 b Planetary Parameters (2 Solutions)

Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Beard et al. 2025	Stock et al. 2020
T_eq (K)	336±1	351.0+1.4-1.3
S (S_⨁)	2.37±0.26	2.53±0.04
ω (deg)	0	78.80+47.60-44.70
M_p sin i (M_⨁)	3.85+0.35-0.33	4.00±0.40
M_p sin i (M_Jup)	0.0121+0.0011-0.0010	0.0126±0.0013
e	0	0.10+0.09-0.07
P (days)	14.2370±0.0015	14.238±0.002
K (m/s)	2.01±0.12	2.11+0.21-0.20
a (au)	0.0808±0.0042	0.0818+0.0011-0.0012
T_C (days)	2458626.81±0.13 (BJD-TDB)	---

GJ 251 c Planetary Parameters (1 Solution)

Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Beard et al. 2025
T_eq (K)	216.0±0.8
S (S_⨁)	0.404±0.059
ω (deg)	0
M_p sin i (M_⨁)	3.88±0.79
M_p sin i (M_Jup)	0.0122±0.0025
e	0
P (days)	53.647±0.044
K (m/s)	1.23±0.22
a (au)	0.196±0.014
T_C (days)	2458922.0±1.4 (BJD-TDB)

Ancillary Information (1 Unique File)

+ GJ 251 (1 File Type, 1 File)

Literature Time Series (1 File Type, 1 File)

File Type	Data Points	Filter	Reference
Photometric Light Curve	89	Hp (Hipparcos)	Hipparcos and Tycho Catalogs

Nearby Data (within 30 arcseconds) Browse Nearby Data

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

Data Files: 2 SuperWASP Time Series; 2 Associated Literature Data

Bibliography (16 References)

Discovery of a Nearby Habitable Zone Super-Earth Candidate Amenable to Direct Imaging
Beard et al. 2025 Reference Overview
The CARMENES search for exoplanets around M dwarfs. Three temperate-to-warm super-Earths
Stock et al. 2020 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
All WISE Data Release
Cutri et al. 2014 Reference Overview
Chromospheric Ca II Emission in Nearby F, G, K, and M Stars
Wright 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
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
Photometry of Stars with Large Proper Motion
Weis 1996 Reference Overview
CA II H and K measurements made at Mount Wilson Observatory, 1966-1983
Duncan et al. 1991 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

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Debug Info

https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/4/GJ_251.json

GJ 251

Catalog Parameters

06h54m48.06s

Dec

dec

+33d15m59.27s

elat

10.37791

elon

101.61053

glat

15.13189

glon

182.93672

m_V

sy_vmag

9.89±0.10

m_TESS

sy_tmag

7.6481900±0.0078748

m_J

sy_jmag

6.104±0.024

m_H

sy_hmag

5.526±0.016

m_Ks

sy_kmag

5.275±0.023

sy_kepmag

no_data

m_W1

sy_w1mag

5.119±0.159

m_W2

sy_w2mag

4.798±0.078

m_W3

sy_w3mag

4.916±0.016

m_W4

sy_w4mag

4.786±0.031

m_Ic

sy_icmag

7.500±0.025

m_Gaia

sy_gaiamag

8.855180±0.001134

m_B

sy_bmag

11.740±0.113

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

sy_pm

828.3471043±0.1298242

μ_δ

sy_pmdec

-398.134000±0.118627

μ_α

sy_pmra

-726.394000±0.133004

sy_plx

179.1640000±0.0631919

Distance

sy_dist

5.58057±0.00198

Set Parameters

R_✶

st_rad

0.38

T_eff

st_teff

3423