GJ 887 Overview
GJ 887
0.50
R⦿
3667.00
K
GJ 887 b
GJ 887 c
Discovery Data
| Host | Planet | Orbital Separation | Planet Size | Method | Year | Reference | Disposition |
|---|---|---|---|---|---|---|---|
| GJ 887 | GJ 887 b | 9.26 d | > 4.2 M⨁ | Radial Velocity | 2020 | Jeffers et al. 2020 | Confirmed Planet |
| GJ 887 | GJ 887 c | 21.79 d | > 7.6 M⨁ | Radial Velocity | 2020 | Jeffers et al. 2020 | 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
- 23h05m52.04s
- Dec
- -35d51m11.0s
- Distance
- 3.29±0.01 pc
- Parallax
- 303.90±0.87 mas
- Ecliptic Latitude
- -27.51181 deg
- Ecliptic Longitude
- 332.68045 deg
- Galactic Latitude
- -65.95709 deg
- Galactic Longitude
- 5.10081 deg
- Total Proper Motion
- 6896.07±0.70 mas/yr
- Proper Motion (RA)
- 6767.26±0.70 mas/yr
- Proper Motion (Dec)
- 1326.66±0.74 mas/yr
- Photometry
-
mV7.335
-
mTESS---
-
mJ---
-
mH---
-
mKs3.465±0.200
-
mIc5.315
-
mGaia6.5219927
-
mB8.840
-
Abundances
(Hypatia Catalog) -
[Fe/H] -0.23±0.04 dex
-
[O/H] -0.22±0.09 dex
| Source | 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 |
3676.320+167.907-119.858
|
3957.3574+77.5552-81.8300
|
3667 | --- | --- | --- | --- | --- | --- |
|
L✶
(log10(L⦿))
|
-1.43+0.04-0.05
|
-1.38405+0.06318-0.07257
|
--- |
-1.398 +0.544-0.176
|
--- | --- | --- | --- | --- | --- |
|
M✶
(M⦿)
|
0.489±0.050 |
0.5400000+0.1084300-0.0777627
|
--- | 0.44 | --- | --- | --- | --- | --- | --- |
|
R✶
(R⦿)
|
0.4712±0.0860 |
0.5009560+0.0619271-0.0817915
|
--- | 0.50 | --- | --- | --- | --- | --- | --- |
|
Sp. T
|
M1 V | --- | --- | M1.0V | --- | --- | --- | M0.5 | M2/3 V | Map |
|
Metallicity
(dex)
|
-0.060±0.080 [Fe/H] | -0.22±0.09 [M/H] | --- | --- | --- | --- | --- | --- | --- | --- |
|
v sin i
(km/s)
|
2.5±1.0 | --- | --- | --- | --- | 1 | --- | --- | --- | --- |
|
Age
(Gyr)
|
2.88+3.85-2.88
|
--- | --- | --- | --- | --- | --- | --- | --- | --- |
|
log g
(log10(cm/s2))
|
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
|
--- | --- | --- | --- | --- | --- | --- | --- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Jeffers et al. 2020 |
|---|---|
|
Teq
(K)
|
468 |
|
S
(S⨁)
|
7.95±0.20 |
|
Mp sin i
(M⨁)
|
4.2±0.6 |
|
Mp sin i
(MJup)
|
0.013±0.002 |
|
e
|
0 |
|
P
(days)
|
9.262±0.001 |
|
K
(m/s)
|
2.1+0.3-0.2
|
|
a
(au)
|
0.068±0.002 |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
- Planetary Systems
| Source | Jeffers et al. 2020 |
|---|---|
|
Teq
(K)
|
352 |
|
S
(S⨁)
|
2.56±0.20 |
|
Mp sin i
(M⨁)
|
7.6±1.2 |
|
Mp sin i
(MJup)
|
0.024±0.004 |
|
P
(days)
|
21.789+0.004-0.005
|
|
K
(m/s)
|
2.8±0.4 |
|
a
(au)
|
0.120±0.004 |
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
- 2 Confirmed Planets
- 1 2MASS Point Source Catalog
- Data Files
- 2 KELT Time Series
- 2 Associated Literature Data
-
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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