GJ 3998 Overview
GJ 3998
0.50
R⦿
3726.00
K
GJ 3998 b
GJ 3998 c
GJ 3998 d
- Other Data
- Bibliography 12
- Exoplanet Archive Notes 2
- Nearby Data 5
Discovery Data
| Host | Planet | Method | Year | Reference | Disposition |
|---|---|---|---|---|---|
| GJ 3998 | GJ 3998 b | Radial Velocity | 2016 | Affer et al. 2016 | Confirmed Planet |
| GJ 3998 | GJ 3998 c | Radial Velocity | 2016 | Affer et al. 2016 | Confirmed Planet |
| GJ 3998 | GJ 3998 d | Radial Velocity | 2025 | Stefanov et al. 2025 | Confirmed Planet |
GJ 3998 b
- Time of inferior conjunction is BJD 2456905.895+0.042-0.040 from Table 6. (Affer et al. 2016)
- Time of inferior conjunction is BJD 2456902.2+0.24-0.29 from Table 6. (Affer et al. 2016)
- RA
- 17h16m00.49s
- Dec
- +11d03m22.23s
- Distance
- 18.1459±0.0165 pc
- Parallax
- 55.0799000±0.0497391 mas
- Ecliptic Latitude
- 33.99848 deg
- Ecliptic Longitude
- 256.94387 deg
- Galactic Latitude
- 26.15047 deg
- Galactic Longitude
- 32.27249 deg
- Total Proper Motion
- 373.4729173±0.1104106 mas/yr
- Proper Motion (RA)
- -137.311000±0.141398 mas/yr
- Proper Motion (Dec)
- -347.315000±0.104742 mas/yr
- Photometry
-
mV10.844±0.008
-
mTESS8.9367700±0.0072958
-
mJ7.634±0.021
-
mH7.020±0.029
-
mKs6.816±0.016
-
mW16.678±0.065
-
mW26.588±0.021
-
mW36.536±0.017
-
mW46.445±0.063
-
mIc8.780±0.013
-
mGaia9.983370±0.000669
-
mB12.351±0.059
-
mg11.5001000±0.0004609
-
mi9.3336700±0.0002527
-
mr10.1539000±0.0004375
-
mu15.0230000±0.0060295
-
mz9.6066700±0.0011641
| Source |
Stefanov et al. 2025 |
TICv8 | Gaia DR2 |
Affer et al. 2016 |
Turnbull 2015 | Hawley et al. 1996 |
|---|---|---|---|---|---|---|
|
Teff
(K)
|
3726±68 | 3667.0±157.0 |
3889.00+119.45-162.09
|
3722±68 | 3611 | --- |
|
L✶
(log10(L⦿))
|
-1.358±0.086 |
-1.35604+0.09029-0.11412
|
--- |
-1.4+0.1-0.1
|
-1.398 +0.875-0.740
|
--- |
|
Metallicity
(dex)
|
-0.13±0.09 [Fe/H] | --- | --- | -0.16±0.09 [Fe/H] | --- | --- |
|
Age
(Gyr)
|
8.380±4.060 | --- | --- | --- | --- | --- |
|
M✶
(M⦿)
|
0.52±0.05 | 0.5174810±0.0201628 | --- | 0.50±0.05 | 0.45 | --- |
|
R✶
(R⦿)
|
0.50±0.05 | 0.5200120±0.0152661 | --- | 0.49±0.05 | 0.54 | --- |
|
log g
(log10(cm/s2))
|
4.75±0.04 | 4.7199400±0.0085765 | --- | 4.77±0.04 | --- | --- |
|
Sp. T
|
--- | --- | --- | M1 | M2.5 | M1 |
|
γ
(km/s)
|
--- | --- | -45.750032586591814±0.227732225398387 | -44.81 | --- | --- |
|
v sin i
(km/s)
|
--- | --- | --- | 0.930±0.550 | --- | --- |
|
ρ✶
(g/cm3)
|
--- | 5.1882313±0.2550531 | --- | --- | --- | --- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
| Source |
Stefanov et al. 2025 |
Affer et al. 2016 |
|---|---|---|
|
S
(S⨁)
|
48+11-9
|
--- |
|
Mp sin i
(M⨁)
|
2.50+0.30-0.29
|
2.47±0.27 |
|
Mp sin i
(MJup)
|
0.00787+0.00094-0.00091
|
0.00777±0.00085 |
|
e
|
0 | 0 |
|
P
(days)
|
2.65033+0.00022-0.00019
|
2.64977+0.00081-0.00077
|
|
K
(m/s)
|
1.79±0.18 |
1.82+0.14-0.16
|
|
a
(au)
|
0.030±0.001 | 0.029±0.001 |
|
TC
(days)
|
2460202.964+0.249-0.216
|
--- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
| Source |
Stefanov et al. 2025 |
Affer et al. 2016 |
|---|---|---|
|
S
(S⨁)
|
5.4+1.3-1.0
|
--- |
|
Mp sin i
(M⨁)
|
6.82+0.78-0.75
|
6.26+0.79-0.76
|
|
Mp sin i
(MJup)
|
0.0215+0.0025-0.0024
|
0.0197+0.0025-0.0024
|
|
e
|
0 |
0.0490+0.0520-0.0340
|
|
P
(days)
|
13.727+0.003-0.004
|
13.740±0.016 |
|
K
(m/s)
|
2.86±0.26 |
2.67+0.28-0.23
|
|
a
(au)
|
0.090±0.003 | 0.089±0.003 |
|
TC
(days)
|
2460196.96+0.70-0.75
|
--- |
- Status
- Confirmed Planet
- Detected By
- Radial Velocity
- Tools
| Source |
Stefanov et al. 2025 |
|---|---|
|
S
(S⨁)
|
1.2+0.3-0.2
|
|
Mp sin i
(M⨁)
|
6.07+1.00-0.96
|
|
Mp sin i
(MJup)
|
0.0191+0.0031-0.0030
|
|
e
|
0 |
|
P
(days)
|
41.78±0.05 |
|
K
(m/s)
|
1.74+0.26-0.25
|
|
a
(au)
|
0.189±0.006 |
|
TC
(days)
|
2460170.55+3.29-3.15
|
Literature Time Series
(1 File Type, 1 File)
| File Type | Data Points | Filter | Reference |
|---|---|---|---|
| Photometric Light Curve | 89 | Hp (Hipparcos) | Hipparcos and Tycho Catalogs |
- Known Objects
- 3 Confirmed Planets
- 3 2MASS Point Source Catalog
- Data Files
- 4 KELT Time Series
- 3 Associated Literature Data
-
HADES RV Programme with HARPS-N at TNG XVI. A super-Earth in the habitable zone of the GJ 3998 multi-planet system
Stefanov et al. 2025 -
The Revised TESS Input Catalog and Candidate Target List
TICv8 | Reference Overview -
Gaia Data Release 2
Gaia DR2 | Reference Overview -
HADES RV program with HARPS-N at the TNG GJ 3998: An early M-dwarf hosting a system of super-Earths
Affer et al. 2016 | 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 -
Validation of the new Hipparcos reduction
van Leeuwen et al. 2007 | Reference Overview -
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog | 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 -
Photometric parallaxes for selected stars of color class M fromthe NLTT catalog. II - The declination zone 0 deg to +20 deg
Weis 1986 | 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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