GJ 887 Overview

GJ 887 0.50 R_⦿ 3667.00 K

GJ 887 e

GJ 887 b

GJ 887 c

GJ 887 d

Overview Notes 2 Parameters Ancillary 1 Nearby Data Bibliography 18 Legend Expand All

GJ 887 Architecture & Discovery Information

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
GJ 887
GJ 887 e	4.42 d	> 1.46 M_⨁	Radial Velocity	2026	Hartogh et al. 2026	Confirmed Planet
GJ 887 b	9.26 d	> 3.9 M_⨁	Radial Velocity	2020	Jeffers et al. 2020	Confirmed Planet
GJ 887 c	21.78 d	> 6.5 M_⨁	Radial Velocity	2020	Jeffers et al. 2020	Confirmed Planet
GJ 887 d	50.77 d	> 6.1 M_⨁	Radial Velocity	2026	Hartogh et al. 2026	Confirmed Planet

Exoplanet Archive Notes (2)

GJ 887 b

Equilibrium temperature was calculated assuming a Bond albedo of 0.3. (Jeffers et al. 2020)

GJ 887 c

Equilibrium temperature was calculated assuming a Bond albedo of 0.3. (Jeffers et al. 2020)

GJ 887 Stellar Parameters (12 Solutions)

RA: 23h06m00.66s

Dec: -35d50m50.46s

Distance: 3.28679±0.00049 pc

Parallax: 304.219000±0.045097 mas

Ecliptic Latitude: -27.51936 deg

Ecliptic Longitude: 332.71281 deg

Galactic Latitude: -65.98674 deg

Galactic Longitude: 5.09735 deg

Total Proper Motion: 6895.5462606±0.0709439 mas/yr

Proper Motion (RA): 6765.9900000±0.0707397 mas/yr

Proper Motion (Dec): 1330.3900000±0.0760344 mas/yr

Photometry: m_V
7.56±0.20; m_TESS
5.5664±0.0061; m_J
4.338±0.258; m_H
3.608±0.230; m_Ks
3.465±0.200; m_Ic
5.315; m_Gaia
6.521990±0.000896; m_B
8.840

Abundances (Hypatia Catalog): [Fe/H] -0.23±0.04 dex; [O/H] -0.22±0.09 dex

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

Source	Hartogh et al. 2026	Harada et al. 2025	Jeffers et al. 2020	TICv8	Gaia DR2	Turnbull 2015	Wright et al. 2004	Nordstrom et al. 2004	Nidever et al. 2002	Hawley et al. 1996	Michigan Catalog, Vol. 3	Cannon & Pickering 1918
S Index	---	---	---	---	---	---	1.070±0.139	---	---	---	---	---
T_eff (K)	3688±86	3680	3688±86	3676.320+167.907-119.858	3957.3574+77.5552-81.8300	3667	---	---	---	---	---	---
L_✶ (log₁₀(L_⦿))	-1.43+0.04-0.05	---	-1.43+0.04-0.05	-1.38405+0.06318-0.07257	---	-1.398 +0.544-0.176	---	---	---	---	---	---
M_✶ (M_⦿)	0.495±0.049	---	0.489±0.050	0.5400000+0.1084300-0.0777627	---	0.44	---	---	---	---	---	---
R_✶ (R_⦿)	0.468±0.022	---	0.4712±0.0860	0.5009560+0.0619271-0.0817915	---	0.50	---	---	---	---	---	---
Sp. T	M1 V	---	M1 V	---	---	M1.0V	---	---	---	M0.5	M2/3 V	Map
Metallicity (dex)	-0.060±0.080 [Fe/H]	---	-0.060±0.080 [Fe/H]	-0.22±0.09 [M/H]	---	---	---	---	---	---	---	---
v sin i (km/s)	<2.5	---	2.5±1.0	---	---	---	---	1	---	---	---	---
Age (Gyr)	2.90+8.00-2.20	---	2.88+3.85-2.88	---	---	---	---	---	---	---	---	---
log g (log₁₀(cm/s²))	4.156+0.040-0.038	---	4.78	4.770860+0.180618-0.175462	---	---	---	---	---	---	---	---
γ (km/s)	---	---	---	---	8.172909859624841±0.144854029319970	---	---	7.5±0.2	8.8	---	---	---
ρ_✶ (g/cm³)	---	---	---	6.05563+3.52293-2.34853	---	---	---	---	---	---	---	---
P_rot (days)	38.7±0.5	---	---	---	---	---	---	---	---	---	---	---

GJ 887 e Planetary Parameters (1 Solution)

Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Hartogh et al. 2026
T_eq (K)	544+21-20
S (S_⨁)	20.9+4.0-2.9
M_p sin i (M_⨁)	1.46+0.19-0.18
M_p sin i (M_Jup)	0.00459+0.00060-0.00057
P (days)	4.42490+0.00014-0.00013
K (m/s)	0.910±0.100
a (au)	0.0417+0.0014-0.0015
T_C (days)	2453488.05±0.13 (BJD)

GJ 887 b Planetary Parameters (3 Solutions)

Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Hartogh et al. 2026	Harada et al. 2025	Jeffers et al. 2020
T_eq (K)	426±16	---	468
S (S_⨁)	7.8+1.3-1.1	---	7.95±0.20
M_p sin i (M_⨁)	3.9±0.5	6.9+2.1-2.2	4.2±0.6
M_p sin i (M_Jup)	0.012±0.002	0.022+0.007-0.007	0.013±0.002
e	0.14±0.06	0.0830+0.0850-0.0580	0
P (days)	9.2619±0.0005	9.26177+0.00055-0.00053	9.262±0.001
K (m/s)	2.00±0.17	2.81+0.26-0.27	2.1+0.3-0.2
a (au)	0.0683+0.0022-0.0024	0.0751+0.0095-0.0130	0.068±0.002
ω (deg)	180±130	6.0+86.0-74.0	---
T_C (days)	2453492.75±0.27 (BJD)	2455197.14+0.25-0.29 (JD)	---

GJ 887 c Planetary Parameters (3 Solutions)

Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Hartogh et al. 2026	Harada et al. 2025	Jeffers et al. 2020
T_eq (K)	320+13-12	---	352
S (S_⨁)	2.5±0.4	---	2.56±0.20
M_p sin i (M_⨁)	6.5+1.0-0.9	10.2+3.0-3.2	7.6±1.2
M_p sin i (M_Jup)	0.020+0.003-0.003	0.0321+0.0094-0.0101	0.024±0.004
P (days)	21.784±0.004	21.7952+0.0025-0.0024	21.789+0.004-0.005
K (m/s)	2.54±0.27	3.26+0.31-0.32	2.8±0.4
a (au)	0.121+0.004-0.005	0.133+0.017-0.022	0.120±0.004
ω (deg)	200+110-140	-2.0+20.0-25.0	---
e	0.17±0.06	0.265+0.076-0.077	---
T_C (days)	2453498.2±0.9 (BJD)	2456177.42+0.61-0.56 (JD)	---

GJ 887 d Planetary Parameters (1 Solution)

Status: Confirmed Planet

Detected By: Radial Velocity

Tools: Planetary Systems

Source	Hartogh et al. 2026
T_eq (K)	241+10-9
S (S_⨁)	0.81+0.13-0.12
M_p sin i (M_⨁)	6.1±1.4
M_p sin i (M_Jup)	0.019±0.004
P (days)	50.77±0.05
K (m/s)	1.7±0.4
a (au)	0.212+0.007-0.008
T_C (days)	2453496±4 (BJD)

Ancillary Information (1 Unique File)

+ GJ 887 (1 File Type, 1 File)

Literature Time Series (1 File Type, 1 File)

File Type	Data Points	Filter	Reference
Photometric Light Curve	132	Hp (Hipparcos)	Hipparcos and Tycho Catalogs

Nearby Data (within 30 arcseconds) Browse Nearby Data

Known Objects: 4 Confirmed Planets

Data Files: 2 KELT Time Series; 4 Associated Literature Data

Bibliography (18 References)

RedDots: Multiplanet system around M dwarf GJ 887 in the solar neighborhood
Hartogh et al. 2026 Reference Overview
SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring
Harada et al. 2025 Reference Overview
A multiplanet system of super-Earths orbiting the brightest red dwarf star GJ 887
Jeffers 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
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 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
BVRI photometry of the Gliese Catalogue stars
Bessell 1990 Reference Overview
Michigan Catalog of two-dimensional spectral types for the HD stars, Vol 3
Michigan Catalog, Vol. 3 Reference Overview
VRI photometry of nearby stars.
Cousins 1980a 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_2.0/5/GJ_887.json

GJ 887

Catalog Parameters

23h06m00.66s

Dec

dec

-35d50m50.46s

elat

-27.51936

elon

332.71281

glat

-65.98674

glon

5.09735

m_V

sy_vmag

7.56±0.20

m_TESS

sy_tmag

5.5664±0.0061

m_J

sy_jmag

4.338±0.258

m_H

sy_hmag

3.608±0.230

m_Ks

sy_kmag

3.465±0.200

sy_kepmag

no_data

sy_w1mag

no_data

sy_w2mag

no_data

sy_w3mag

no_data

sy_w4mag

no_data

m_Ic

sy_icmag

5.315

m_Gaia

sy_gaiamag

6.521990±0.000896

m_B

sy_bmag

8.840

sy_gmag

no_data

sy_imag

no_data

sy_rmag

no_data

sy_umag

no_data

sy_zmag

no_data

sy_pm

6895.5462606±0.0709439

μ_δ

sy_pmdec

1330.3900000±0.0760344

μ_α

sy_pmra

6765.9900000±0.0707397

sy_plx

304.219000±0.045097

Distance

sy_dist

3.28679±0.00049

Set Parameters

R_✶

st_rad

0.50

T_eff

st_teff

3667