GJ 887 Overview
GJ 887
0.50
R⦿
3667.00
K
GJ 887 e
GJ 887 b
GJ 887 c
GJ 887 d
Discovery Data
| Host | Planet | 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 | GJ 887 b | 9.26 d | > 3.9 M⨁ | Radial Velocity | 2020 | Jeffers et al. 2020 | Confirmed Planet |
| GJ 887 | GJ 887 c | 21.78 d | > 6.5 M⨁ | Radial Velocity | 2020 | Jeffers et al. 2020 | Confirmed Planet |
| GJ 887 | GJ 887 d | 50.77 d | > 6.1 M⨁ | Radial Velocity | 2026 | Hartogh et al. 2026 | Confirmed Planet |
GJ 887 b
- Equilibrium temperature was calculated assuming a Bond albedo of 0.3. (Jeffers et al. 2020)
- Equilibrium temperature was calculated assuming a Bond albedo of 0.3. (Jeffers et al. 2020)
- 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
-
mV7.56±0.20
-
mTESS5.5664±0.0061
-
mJ4.338±0.258
-
mH3.608±0.230
-
mKs3.465±0.200
-
mIc5.315
-
mGaia6.521990±0.000896
-
mB8.840
-
Abundances
(Hypatia Catalog) -
[Fe/H] -0.23±0.04 dex
-
[O/H] -0.22±0.09 dex
| 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 | --- | --- | --- | --- | --- |
|
Teff
(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
|
--- | --- | --- | --- | --- | --- | --- | --- |
|
Prot
(days)
|
38.7±0.5 | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Hartogh et al. 2026 |
|---|---|
|
Teq
(K)
|
544+21-20
|
|
S
(S⨁)
|
20.9+4.0-2.9
|
|
Mp sin i
(M⨁)
|
1.46+0.19-0.18
|
|
Mp sin i
(MJup)
|
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
|
|
TC
(days)
|
2453488.05±0.13
(BJD)
|
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Hartogh et al. 2026 | Harada et al. 2025 | Jeffers et al. 2020 |
|---|---|---|---|
|
Teq
(K)
|
426±16 | --- | 468 |
|
S
(S⨁)
|
7.8+1.3-1.1
|
--- | 7.95±0.20 |
|
Mp sin i
(M⨁)
|
3.9±0.5 |
6.9+2.1-2.2
|
4.2±0.6 |
|
Mp sin i
(MJup)
|
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
|
--- |
|
TC
(days)
|
2453492.75±0.27
(BJD)
|
2455197.14+0.25-0.29
(JD)
|
--- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Hartogh et al. 2026 | Harada et al. 2025 | Jeffers et al. 2020 |
|---|---|---|---|
|
Teq
(K)
|
320+13-12
|
--- | 352 |
|
S
(S⨁)
|
2.5±0.4 | --- | 2.56±0.20 |
|
Mp sin i
(M⨁)
|
6.5+1.0-0.9
|
10.2+3.0-3.2
|
7.6±1.2 |
|
Mp sin i
(MJup)
|
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
|
--- |
|
TC
(days)
|
2453498.2±0.9
(BJD)
|
2456177.42+0.61-0.56
(JD)
|
--- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Hartogh et al. 2026 |
|---|---|
|
Teq
(K)
|
241+10-9
|
|
S
(S⨁)
|
0.81+0.13-0.12
|
|
Mp sin i
(M⨁)
|
6.1±1.4 |
|
Mp sin i
(MJup)
|
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
|
|
TC
(days)
|
2453496±4
(BJD)
|
Literature Time Series
(1 File Type, 1 File)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 132 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
- Known Objects
- 1 2MASS Point Source Catalog
- Data Files
- 2 KELT Time Series
-
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
- 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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